code.delx.au - gnu-emacs/blob - lisp/gnus/gnus-sum.el

   1 ;;; gnus-sum.el --- summary mode commands for Gnus
   2 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001
   3 ;;        Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (eval-when-compile (require 'cl))
  30
  31 (require 'gnus)
  32 (require 'gnus-group)
  33 (require 'gnus-spec)
  34 (require 'gnus-range)
  35 (require 'gnus-int)
  36 (require 'gnus-undo)
  37 (require 'gnus-util)
  38 (require 'mm-decode)
  39 ;; Recursive :-(.
  40 ;; (require 'gnus-art)
  41 (require 'nnoo)
  42 (autoload 'gnus-summary-limit-include-cached "gnus-cache" nil t)
  43 (autoload 'gnus-cache-write-active "gnus-cache")
  44 (autoload 'mm-uu-dissect "mm-uu")
  45
  46 (defcustom gnus-kill-summary-on-exit t
  47   "*If non-nil, kill the summary buffer when you exit from it.
  48 If nil, the summary will become a \"*Dead Summary*\" buffer, and
  49 it will be killed sometime later."
  50   :group 'gnus-summary-exit
  51   :type 'boolean)
  52
  53 (defcustom gnus-fetch-old-headers nil
  54   "*Non-nil means that Gnus will try to build threads by grabbing old headers.
  55 If an unread article in the group refers to an older, already read (or
  56 just marked as read) article, the old article will not normally be
  57 displayed in the Summary buffer.  If this variable is non-nil, Gnus
  58 will attempt to grab the headers to the old articles, and thereby
  59 build complete threads.  If it has the value `some', only enough
  60 headers to connect otherwise loose threads will be displayed.  This
  61 variable can also be a number.  In that case, no more than that number
  62 of old headers will be fetched.  If it has the value `invisible', all
  63 old headers will be fetched, but none will be displayed.
  64
  65 The server has to support NOV for any of this to work."
  66   :group 'gnus-thread
  67   :type '(choice (const :tag "off" nil)
  68                  (const some)
  69                  number
  70                  (sexp :menu-tag "other" t)))
  71
  72 (defcustom gnus-refer-thread-limit 200
  73   "*The number of old headers to fetch when doing \\<gnus-summary-mode-map>\\[gnus-summary-refer-thread].
  74 If t, fetch all the available old headers."
  75   :group 'gnus-thread
  76   :type '(choice number
  77                  (sexp :menu-tag "other" t)))
  78
  79 (defcustom gnus-summary-make-false-root 'adopt
  80   "*nil means that Gnus won't gather loose threads.
  81 If the root of a thread has expired or been read in a previous
  82 session, the information necessary to build a complete thread has been
  83 lost.  Instead of having many small sub-threads from this original thread
  84 scattered all over the summary buffer, Gnus can gather them.
  85
  86 If non-nil, Gnus will try to gather all loose sub-threads from an
  87 original thread into one large thread.
  88
  89 If this variable is non-nil, it should be one of `none', `adopt',
  90 `dummy' or `empty'.
  91
  92 If this variable is `none', Gnus will not make a false root, but just
  93 present the sub-threads after another.
  94 If this variable is `dummy', Gnus will create a dummy root that will
  95 have all the sub-threads as children.
  96 If this variable is `adopt', Gnus will make one of the \"children\"
  97 the parent and mark all the step-children as such.
  98 If this variable is `empty', the \"children\" are printed with empty
  99 subject fields.  (Or rather, they will be printed with a string
 100 given by the `gnus-summary-same-subject' variable.)"
 101   :group 'gnus-thread
 102   :type '(choice (const :tag "off" nil)
 103                  (const none)
 104                  (const dummy)
 105                  (const adopt)
 106                  (const empty)))
 107
 108 (defcustom gnus-summary-gather-exclude-subject "^ *$\\|^(none)$"
 109   "*A regexp to match subjects to be excluded from loose thread gathering.
 110 As loose thread gathering is done on subjects only, that means that
 111 there can be many false gatherings performed.  By rooting out certain
 112 common subjects, gathering might become saner."
 113   :group 'gnus-thread
 114   :type 'regexp)
 115
 116 (defcustom gnus-summary-gather-subject-limit nil
 117   "*Maximum length of subject comparisons when gathering loose threads.
 118 Use nil to compare full subjects.  Setting this variable to a low
 119 number will help gather threads that have been corrupted by
 120 newsreaders chopping off subject lines, but it might also mean that
 121 unrelated articles that have subject that happen to begin with the
 122 same few characters will be incorrectly gathered.
 123
 124 If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
 125 comparing subjects."
 126   :group 'gnus-thread
 127   :type '(choice (const :tag "off" nil)
 128                  (const fuzzy)
 129                  (sexp :menu-tag "on" t)))
 130
 131 (defcustom gnus-simplify-subject-functions nil
 132   "List of functions taking a string argument that simplify subjects.
 133 The functions are applied recursively.
 134
 135 Useful functions to put in this list include: `gnus-simplify-subject-re',
 136 `gnus-simplify-subject-fuzzy' and `gnus-simplify-whitespace'."
 137   :group 'gnus-thread
 138   :type '(repeat function))
 139
 140 (defcustom gnus-simplify-ignored-prefixes nil
 141   "*Regexp, matches for which are removed from subject lines when simplifying fuzzily."
 142   :group 'gnus-thread
 143   :type '(choice (const :tag "off" nil)
 144                  regexp))
 145
 146 (defcustom gnus-build-sparse-threads nil
 147   "*If non-nil, fill in the gaps in threads.
 148 If `some', only fill in the gaps that are needed to tie loose threads
 149 together.  If `more', fill in all leaf nodes that Gnus can find.  If
 150 non-nil and non-`some', fill in all gaps that Gnus manages to guess."
 151   :group 'gnus-thread
 152   :type '(choice (const :tag "off" nil)
 153                  (const some)
 154                  (const more)
 155                  (sexp :menu-tag "all" t)))
 156
 157 (defcustom gnus-summary-thread-gathering-function
 158   'gnus-gather-threads-by-subject
 159   "*Function used for gathering loose threads.
 160 There are two pre-defined functions: `gnus-gather-threads-by-subject',
 161 which only takes Subjects into consideration; and
 162 `gnus-gather-threads-by-references', which compared the References
 163 headers of the articles to find matches."
 164   :group 'gnus-thread
 165   :type '(radio (function-item gnus-gather-threads-by-subject)
 166                 (function-item gnus-gather-threads-by-references)
 167                 (function :tag "other")))
 168
 169 (defcustom gnus-summary-same-subject ""
 170   "*String indicating that the current article has the same subject as the previous.
 171 This variable will only be used if the value of
 172 `gnus-summary-make-false-root' is `empty'."
 173   :group 'gnus-summary-format
 174   :type 'string)
 175
 176 (defcustom gnus-summary-goto-unread t
 177   "*If t, many commands will go to the next unread article.
 178 This applies to marking commands as well as other commands that
 179 \"naturally\" select the next article, like, for instance, `SPC' at
 180 the end of an article.
 181
 182 If nil, the marking commands do NOT go to the next unread article
 183 (they go to the next article instead).  If `never', commands that
 184 usually go to the next unread article, will go to the next article,
 185 whether it is read or not."
 186   :group 'gnus-summary-marks
 187   :link '(custom-manual "(gnus)Setting Marks")
 188   :type '(choice (const :tag "off" nil)
 189                  (const never)
 190                  (sexp :menu-tag "on" t)))
 191
 192 (defcustom gnus-summary-default-score 0
 193   "*Default article score level.
 194 All scores generated by the score files will be added to this score.
 195 If this variable is nil, scoring will be disabled."
 196   :group 'gnus-score-default
 197   :type '(choice (const :tag "disable")
 198                  integer))
 199
 200 (defcustom gnus-summary-zcore-fuzz 0
 201   "*Fuzziness factor for the zcore in the summary buffer.
 202 Articles with scores closer than this to `gnus-summary-default-score'
 203 will not be marked."
 204   :group 'gnus-summary-format
 205   :type 'integer)
 206
 207 (defcustom gnus-simplify-subject-fuzzy-regexp nil
 208   "*Strings to be removed when doing fuzzy matches.
 209 This can either be a regular expression or list of regular expressions
 210 that will be removed from subject strings if fuzzy subject
 211 simplification is selected."
 212   :group 'gnus-thread
 213   :type '(repeat regexp))
 214
 215 (defcustom gnus-show-threads t
 216   "*If non-nil, display threads in summary mode."
 217   :group 'gnus-thread
 218   :type 'boolean)
 219
 220 (defcustom gnus-thread-hide-subtree nil
 221   "*If non-nil, hide all threads initially.
 222 If threads are hidden, you have to run the command
 223 `gnus-summary-show-thread' by hand or use `gnus-select-article-hook'
 224 to expose hidden threads."
 225   :group 'gnus-thread
 226   :type 'boolean)
 227
 228 (defcustom gnus-thread-hide-killed t
 229   "*If non-nil, hide killed threads automatically."
 230   :group 'gnus-thread
 231   :type 'boolean)
 232
 233 (defcustom gnus-thread-ignore-subject t
 234   "*If non-nil, which is the default, ignore subjects and do all threading based on the Reference header.
 235 If nil, articles that have different subjects from their parents will
 236 start separate threads."
 237   :group 'gnus-thread
 238   :type 'boolean)
 239
 240 (defcustom gnus-thread-operation-ignore-subject t
 241   "*If non-nil, subjects will be ignored when doing thread commands.
 242 This affects commands like `gnus-summary-kill-thread' and
 243 `gnus-summary-lower-thread'.
 244
 245 If this variable is nil, articles in the same thread with different
 246 subjects will not be included in the operation in question.  If this
 247 variable is `fuzzy', only articles that have subjects that are fuzzily
 248 equal will be included."
 249   :group 'gnus-thread
 250   :type '(choice (const :tag "off" nil)
 251                  (const fuzzy)
 252                  (sexp :tag "on" t)))
 253
 254 (defcustom gnus-thread-indent-level 4
 255   "*Number that says how much each sub-thread should be indented."
 256   :group 'gnus-thread
 257   :type 'integer)
 258
 259 (defcustom gnus-auto-extend-newsgroup t
 260   "*If non-nil, extend newsgroup forward and backward when requested."
 261   :group 'gnus-summary-choose
 262   :type 'boolean)
 263
 264 (defcustom gnus-auto-select-first t
 265   "*If nil, don't select the first unread article when entering a group.
 266 If this variable is `best', select the highest-scored unread article
 267 in the group.  If t, select the first unread article.
 268
 269 This variable can also be a function to place point on a likely
 270 subject line.  Useful values include `gnus-summary-first-unread-subject',
 271 `gnus-summary-first-unread-article' and
 272 `gnus-summary-best-unread-article'.
 273
 274 If you want to prevent automatic selection of the first unread article
 275 in some newsgroups, set the variable to nil in
 276 `gnus-select-group-hook'."
 277   :group 'gnus-group-select
 278   :type '(choice (const :tag "none" nil)
 279                  (const best)
 280                  (sexp :menu-tag "first" t)
 281                  (function-item gnus-summary-first-unread-subject)
 282                  (function-item gnus-summary-first-unread-article)
 283                  (function-item gnus-summary-best-unread-article)))
 284
 285 (defcustom gnus-auto-select-next t
 286   "*If non-nil, offer to go to the next group from the end of the previous.
 287 If the value is t and the next newsgroup is empty, Gnus will exit
 288 summary mode and go back to group mode.  If the value is neither nil
 289 nor t, Gnus will select the following unread newsgroup.  In
 290 particular, if the value is the symbol `quietly', the next unread
 291 newsgroup will be selected without any confirmation, and if it is
 292 `almost-quietly', the next group will be selected without any
 293 confirmation if you are located on the last article in the group.
 294 Finally, if this variable is `slightly-quietly', the `Z n' command
 295 will go to the next group without confirmation."
 296   :group 'gnus-summary-maneuvering
 297   :type '(choice (const :tag "off" nil)
 298                  (const quietly)
 299                  (const almost-quietly)
 300                  (const slightly-quietly)
 301                  (sexp :menu-tag "on" t)))
 302
 303 (defcustom gnus-auto-select-same nil
 304   "*If non-nil, select the next article with the same subject.
 305 If there are no more articles with the same subject, go to
 306 the first unread article."
 307   :group 'gnus-summary-maneuvering
 308   :type 'boolean)
 309
 310 (defcustom gnus-summary-check-current nil
 311   "*If non-nil, consider the current article when moving.
 312 The \"unread\" movement commands will stay on the same line if the
 313 current article is unread."
 314   :group 'gnus-summary-maneuvering
 315   :type 'boolean)
 316
 317 (defcustom gnus-auto-center-summary t
 318   "*If non-nil, always center the current summary buffer.
 319 In particular, if `vertical' do only vertical recentering.  If non-nil
 320 and non-`vertical', do both horizontal and vertical recentering."
 321   :group 'gnus-summary-maneuvering
 322   :type '(choice (const :tag "none" nil)
 323                  (const vertical)
 324                  (integer :tag "height")
 325                  (sexp :menu-tag "both" t)))
 326
 327 (defcustom gnus-show-all-headers nil
 328   "*If non-nil, don't hide any headers."
 329   :group 'gnus-article-hiding
 330   :group 'gnus-article-headers
 331   :type 'boolean)
 332
 333 (defcustom gnus-summary-ignore-duplicates nil
 334   "*If non-nil, ignore articles with identical Message-ID headers."
 335   :group 'gnus-summary
 336   :type 'boolean)
 337
 338 (defcustom gnus-single-article-buffer t
 339   "*If non-nil, display all articles in the same buffer.
 340 If nil, each group will get its own article buffer."
 341   :group 'gnus-article-various
 342   :type 'boolean)
 343
 344 (defcustom gnus-break-pages t
 345   "*If non-nil, do page breaking on articles.
 346 The page delimiter is specified by the `gnus-page-delimiter'
 347 variable."
 348   :group 'gnus-article-various
 349   :type 'boolean)
 350
 351 (defcustom gnus-move-split-methods nil
 352   "*Variable used to suggest where articles are to be moved to.
 353 It uses the same syntax as the `gnus-split-methods' variable."
 354   :group 'gnus-summary-mail
 355   :type '(repeat (choice (list :value (fun) function)
 356                          (cons :value ("" "") regexp (repeat string))
 357                          (sexp :value nil))))
 358
 359 (defcustom gnus-unread-mark ?  ;Whitespace
 360   "*Mark used for unread articles."
 361   :group 'gnus-summary-marks
 362   :type 'character)
 363
 364 (defcustom gnus-ticked-mark ?!
 365   "*Mark used for ticked articles."
 366   :group 'gnus-summary-marks
 367   :type 'character)
 368
 369 (defcustom gnus-dormant-mark ??
 370   "*Mark used for dormant articles."
 371   :group 'gnus-summary-marks
 372   :type 'character)
 373
 374 (defcustom gnus-del-mark ?r
 375   "*Mark used for del'd articles."
 376   :group 'gnus-summary-marks
 377   :type 'character)
 378
 379 (defcustom gnus-read-mark ?R
 380   "*Mark used for read articles."
 381   :group 'gnus-summary-marks
 382   :type 'character)
 383
 384 (defcustom gnus-expirable-mark ?E
 385   "*Mark used for expirable articles."
 386   :group 'gnus-summary-marks
 387   :type 'character)
 388
 389 (defcustom gnus-killed-mark ?K
 390   "*Mark used for killed articles."
 391   :group 'gnus-summary-marks
 392   :type 'character)
 393
 394 (defcustom gnus-souped-mark ?F
 395   "*Mark used for killed articles."
 396   :group 'gnus-summary-marks
 397   :type 'character)
 398
 399 (defcustom gnus-kill-file-mark ?X
 400   "*Mark used for articles killed by kill files."
 401   :group 'gnus-summary-marks
 402   :type 'character)
 403
 404 (defcustom gnus-low-score-mark ?Y
 405   "*Mark used for articles with a low score."
 406   :group 'gnus-summary-marks
 407   :type 'character)
 408
 409 (defcustom gnus-catchup-mark ?C
 410   "*Mark used for articles that are caught up."
 411   :group 'gnus-summary-marks
 412   :type 'character)
 413
 414 (defcustom gnus-replied-mark ?A
 415   "*Mark used for articles that have been replied to."
 416   :group 'gnus-summary-marks
 417   :type 'character)
 418
 419 (defcustom gnus-cached-mark ?*
 420   "*Mark used for articles that are in the cache."
 421   :group 'gnus-summary-marks
 422   :type 'character)
 423
 424 (defcustom gnus-saved-mark ?S
 425   "*Mark used for articles that have been saved to."
 426   :group 'gnus-summary-marks
 427   :type 'character)
 428
 429 (defcustom gnus-ancient-mark ?O
 430   "*Mark used for ancient articles."
 431   :group 'gnus-summary-marks
 432   :type 'character)
 433
 434 (defcustom gnus-sparse-mark ?Q
 435   "*Mark used for sparsely reffed articles."
 436   :group 'gnus-summary-marks
 437   :type 'character)
 438
 439 (defcustom gnus-canceled-mark ?G
 440   "*Mark used for canceled articles."
 441   :group 'gnus-summary-marks
 442   :type 'character)
 443
 444 (defcustom gnus-duplicate-mark ?M
 445   "*Mark used for duplicate articles."
 446   :group 'gnus-summary-marks
 447   :type 'character)
 448
 449 (defcustom gnus-undownloaded-mark ?@
 450   "*Mark used for articles that weren't downloaded."
 451   :group 'gnus-summary-marks
 452   :type 'character)
 453
 454 (defcustom gnus-downloadable-mark ?%
 455   "*Mark used for articles that are to be downloaded."
 456   :group 'gnus-summary-marks
 457   :type 'character)
 458
 459 (defcustom gnus-unsendable-mark ?=
 460   "*Mark used for articles that won't be sent."
 461   :group 'gnus-summary-marks
 462   :type 'character)
 463
 464 (defcustom gnus-score-over-mark ?+
 465   "*Score mark used for articles with high scores."
 466   :group 'gnus-summary-marks
 467   :type 'character)
 468
 469 (defcustom gnus-score-below-mark ?-
 470   "*Score mark used for articles with low scores."
 471   :group 'gnus-summary-marks
 472   :type 'character)
 473
 474 (defcustom gnus-empty-thread-mark ?  ;Whitespace
 475   "*There is no thread under the article."
 476   :group 'gnus-summary-marks
 477   :type 'character)
 478
 479 (defcustom gnus-not-empty-thread-mark ?=
 480   "*There is a thread under the article."
 481   :group 'gnus-summary-marks
 482   :type 'character)
 483
 484 (defcustom gnus-view-pseudo-asynchronously nil
 485   "*If non-nil, Gnus will view pseudo-articles asynchronously."
 486   :group 'gnus-extract-view
 487   :type 'boolean)
 488
 489 (defcustom gnus-auto-expirable-marks
 490   (list gnus-killed-mark gnus-del-mark gnus-catchup-mark
 491         gnus-low-score-mark gnus-ancient-mark gnus-read-mark
 492         gnus-souped-mark gnus-duplicate-mark)
 493   "*The list of marks converted into expiration if a group is auto-expirable."
 494   :version "21.1"
 495   :group 'gnus-summary
 496   :type '(repeat character))
 497
 498 (defcustom gnus-inhibit-user-auto-expire t
 499   "*If non-nil, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on."
 500   :version "21.1"
 501   :group 'gnus-summary
 502   :type 'boolean)
 503
 504 (defcustom gnus-view-pseudos nil
 505   "*If `automatic', pseudo-articles will be viewed automatically.
 506 If `not-confirm', pseudos will be viewed automatically, and the user
 507 will not be asked to confirm the command."
 508   :group 'gnus-extract-view
 509   :type '(choice (const :tag "off" nil)
 510                  (const automatic)
 511                  (const not-confirm)))
 512
 513 (defcustom gnus-view-pseudos-separately t
 514   "*If non-nil, one pseudo-article will be created for each file to be viewed.
 515 If nil, all files that use the same viewing command will be given as a
 516 list of parameters to that command."
 517   :group 'gnus-extract-view
 518   :type 'boolean)
 519
 520 (defcustom gnus-insert-pseudo-articles t
 521   "*If non-nil, insert pseudo-articles when decoding articles."
 522   :group 'gnus-extract-view
 523   :type 'boolean)
 524
 525 (defcustom gnus-summary-dummy-line-format
 526   "  %(:                          :%) %S\n"
 527   "*The format specification for the dummy roots in the summary buffer.
 528 It works along the same lines as a normal formatting string,
 529 with some simple extensions.
 530
 531 %S  The subject"
 532   :group 'gnus-threading
 533   :type 'string)
 534
 535 (defcustom gnus-summary-mode-line-format "Gnus: %g [%A] %Z"
 536   "*The format specification for the summary mode line.
 537 It works along the same lines as a normal formatting string,
 538 with some simple extensions:
 539
 540 %G  Group name
 541 %p  Unprefixed group name
 542 %A  Current article number
 543 %z  Current article score
 544 %V  Gnus version
 545 %U  Number of unread articles in the group
 546 %e  Number of unselected articles in the group
 547 %Z  A string with unread/unselected article counts
 548 %g  Shortish group name
 549 %S  Subject of the current article
 550 %u  User-defined spec
 551 %s  Current score file name
 552 %d  Number of dormant articles
 553 %r  Number of articles that have been marked as read in this session
 554 %E  Number of articles expunged by the score files"
 555   :group 'gnus-summary-format
 556   :type 'string)
 557
 558 (defcustom gnus-list-identifiers nil
 559   "Regexp that matches list identifiers to be removed from subject.
 560 This can also be a list of regexps."
 561   :version "21.1"
 562   :group 'gnus-summary-format
 563   :group 'gnus-article-hiding
 564   :type '(choice (const :tag "none" nil)
 565                  (regexp :value ".*")
 566                  (repeat :value (".*") regexp)))
 567
 568 (defcustom gnus-summary-mark-below 0
 569   "*Mark all articles with a score below this variable as read.
 570 This variable is local to each summary buffer and usually set by the
 571 score file."
 572   :group 'gnus-score-default
 573   :type 'integer)
 574
 575 (defcustom gnus-article-sort-functions '(gnus-article-sort-by-number)
 576   "*List of functions used for sorting articles in the summary buffer.
 577 This variable is only used when not using a threaded display."
 578   :group 'gnus-summary-sort
 579   :type '(repeat (choice (function-item gnus-article-sort-by-number)
 580                          (function-item gnus-article-sort-by-author)
 581                          (function-item gnus-article-sort-by-subject)
 582                          (function-item gnus-article-sort-by-date)
 583                          (function-item gnus-article-sort-by-score)
 584                          (function :tag "other"))))
 585
 586 (defcustom gnus-thread-sort-functions '(gnus-thread-sort-by-number)
 587   "*List of functions used for sorting threads in the summary buffer.
 588 By default, threads are sorted by article number.
 589
 590 Each function takes two threads and return non-nil if the first thread
 591 should be sorted before the other.  If you use more than one function,
 592 the primary sort function should be the last.  You should probably
 593 always include `gnus-thread-sort-by-number' in the list of sorting
 594 functions -- preferably first.
 595
 596 Ready-made functions include `gnus-thread-sort-by-number',
 597 `gnus-thread-sort-by-author', `gnus-thread-sort-by-subject',
 598 `gnus-thread-sort-by-date', `gnus-thread-sort-by-score' and
 599 `gnus-thread-sort-by-total-score' (see `gnus-thread-score-function')."
 600   :group 'gnus-summary-sort
 601   :type '(repeat (choice (function-item gnus-thread-sort-by-number)
 602                          (function-item gnus-thread-sort-by-author)
 603                          (function-item gnus-thread-sort-by-subject)
 604                          (function-item gnus-thread-sort-by-date)
 605                          (function-item gnus-thread-sort-by-score)
 606                          (function-item gnus-thread-sort-by-total-score)
 607                          (function :tag "other"))))
 608
 609 (defcustom gnus-thread-score-function '+
 610   "*Function used for calculating the total score of a thread.
 611
 612 The function is called with the scores of the article and each
 613 subthread and should then return the score of the thread.
 614
 615 Some functions you can use are `+', `max', or `min'."
 616   :group 'gnus-summary-sort
 617   :type 'function)
 618
 619 (defcustom gnus-summary-expunge-below nil
 620   "All articles that have a score less than this variable will be expunged.
 621 This variable is local to the summary buffers."
 622   :group 'gnus-score-default
 623   :type '(choice (const :tag "off" nil)
 624                  integer))
 625
 626 (defcustom gnus-thread-expunge-below nil
 627   "All threads that have a total score less than this variable will be expunged.
 628 See `gnus-thread-score-function' for en explanation of what a
 629 \"thread score\" is.
 630
 631 This variable is local to the summary buffers."
 632   :group 'gnus-threading
 633   :group 'gnus-score-default
 634   :type '(choice (const :tag "off" nil)
 635                  integer))
 636
 637 (defcustom gnus-summary-mode-hook nil
 638   "*A hook for Gnus summary mode.
 639 This hook is run before any variables are set in the summary buffer."
 640   :options '(turn-on-gnus-mailing-list-mode)
 641   :group 'gnus-summary-various
 642   :type 'hook)
 643
 644 (defcustom gnus-summary-menu-hook nil
 645   "*Hook run after the creation of the summary mode menu."
 646   :group 'gnus-summary-visual
 647   :type 'hook)
 648
 649 (defcustom gnus-summary-exit-hook nil
 650   "*A hook called on exit from the summary buffer.
 651 It will be called with point in the group buffer."
 652   :group 'gnus-summary-exit
 653   :type 'hook)
 654
 655 (defcustom gnus-summary-prepare-hook nil
 656   "*A hook called after the summary buffer has been generated.
 657 If you want to modify the summary buffer, you can use this hook."
 658   :group 'gnus-summary-various
 659   :type 'hook)
 660
 661 (defcustom gnus-summary-prepared-hook nil
 662   "*A hook called as the last thing after the summary buffer has been generated."
 663   :group 'gnus-summary-various
 664   :type 'hook)
 665
 666 (defcustom gnus-summary-generate-hook nil
 667   "*A hook run just before generating the summary buffer.
 668 This hook is commonly used to customize threading variables and the
 669 like."
 670   :group 'gnus-summary-various
 671   :type 'hook)
 672
 673 (defcustom gnus-select-group-hook nil
 674   "*A hook called when a newsgroup is selected.
 675
 676 If you'd like to simplify subjects like the
 677 `gnus-summary-next-same-subject' command does, you can use the
 678 following hook:
 679
 680  (setq gnus-select-group-hook
 681       (list
 682         (lambda ()
 683           (mapcar (lambda (header)
 684                      (mail-header-set-subject
 685                       header
 686                       (gnus-simplify-subject
 687                        (mail-header-subject header) 're-only)))
 688                   gnus-newsgroup-headers))))"
 689   :group 'gnus-group-select
 690   :type 'hook)
 691
 692 (defcustom gnus-select-article-hook nil
 693   "*A hook called when an article is selected."
 694   :group 'gnus-summary-choose
 695   :type 'hook)
 696
 697 (defcustom gnus-visual-mark-article-hook
 698   (list 'gnus-highlight-selected-summary)
 699   "*Hook run after selecting an article in the summary buffer.
 700 It is meant to be used for highlighting the article in some way.  It
 701 is not run if `gnus-visual' is nil."
 702   :group 'gnus-summary-visual
 703   :type 'hook)
 704
 705 (defcustom gnus-parse-headers-hook nil
 706   "*A hook called before parsing the headers."
 707   :group 'gnus-various
 708   :type 'hook)
 709
 710 (defcustom gnus-exit-group-hook nil
 711   "*A hook called when exiting summary mode.
 712 This hook is not called from the non-updating exit commands like `Q'."
 713   :group 'gnus-various
 714   :type 'hook)
 715
 716 (defcustom gnus-summary-update-hook
 717   (list 'gnus-summary-highlight-line)
 718   "*A hook called when a summary line is changed.
 719 The hook will not be called if `gnus-visual' is nil.
 720
 721 The default function `gnus-summary-highlight-line' will
 722 highlight the line according to the `gnus-summary-highlight'
 723 variable."
 724   :group 'gnus-summary-visual
 725   :type 'hook)
 726
 727 (defcustom gnus-mark-article-hook '(gnus-summary-mark-read-and-unread-as-read)
 728   "*A hook called when an article is selected for the first time.
 729 The hook is intended to mark an article as read (or unread)
 730 automatically when it is selected."
 731   :group 'gnus-summary-choose
 732   :type 'hook)
 733
 734 (defcustom gnus-group-no-more-groups-hook nil
 735   "*A hook run when returning to group mode having no more (unread) groups."
 736   :group 'gnus-group-select
 737   :type 'hook)
 738
 739 (defcustom gnus-ps-print-hook nil
 740   "*A hook run before ps-printing something from Gnus."
 741   :group 'gnus-summary
 742   :type 'hook)
 743
 744 (defcustom gnus-summary-selected-face 'gnus-summary-selected-face
 745   "Face used for highlighting the current article in the summary buffer."
 746   :group 'gnus-summary-visual
 747   :type 'face)
 748
 749 (defcustom gnus-summary-highlight
 750   '(((= mark gnus-canceled-mark)
 751      . gnus-summary-cancelled-face)
 752     ((and (> score default)
 753           (or (= mark gnus-dormant-mark)
 754               (= mark gnus-ticked-mark)))
 755      . gnus-summary-high-ticked-face)
 756     ((and (< score default)
 757           (or (= mark gnus-dormant-mark)
 758               (= mark gnus-ticked-mark)))
 759      . gnus-summary-low-ticked-face)
 760     ((or (= mark gnus-dormant-mark)
 761          (= mark gnus-ticked-mark))
 762      . gnus-summary-normal-ticked-face)
 763     ((and (> score default) (= mark gnus-ancient-mark))
 764      . gnus-summary-high-ancient-face)
 765     ((and (< score default) (= mark gnus-ancient-mark))
 766      . gnus-summary-low-ancient-face)
 767     ((= mark gnus-ancient-mark)
 768      . gnus-summary-normal-ancient-face)
 769     ((and (> score default) (= mark gnus-unread-mark))
 770      . gnus-summary-high-unread-face)
 771     ((and (< score default) (= mark gnus-unread-mark))
 772      . gnus-summary-low-unread-face)
 773     ((= mark gnus-unread-mark)
 774      . gnus-summary-normal-unread-face)
 775     ((and (> score default) (memq mark (list gnus-downloadable-mark
 776                                              gnus-undownloaded-mark)))
 777      . gnus-summary-high-unread-face)
 778     ((and (< score default) (memq mark (list gnus-downloadable-mark
 779                                              gnus-undownloaded-mark)))
 780      . gnus-summary-low-unread-face)
 781     ((memq mark (list gnus-downloadable-mark gnus-undownloaded-mark))
 782      . gnus-summary-normal-unread-face)
 783     ((> score default)
 784      . gnus-summary-high-read-face)
 785     ((< score default)
 786      . gnus-summary-low-read-face)
 787     (t
 788      . gnus-summary-normal-read-face))
 789   "*Controls the highlighting of summary buffer lines.
 790
 791 A list of (FORM . FACE) pairs.  When deciding how a particular summary
 792 line should be displayed, each form is evaluated.  The content of the
 793 face field after the first true form is used.  You can change how those
 794 summary lines are displayed, by editing the face field.
 795
 796 You can use the following variables in the FORM field.
 797
 798 score:   The articles score
 799 default: The default article score.
 800 below:   The score below which articles are automatically marked as read.
 801 mark:    The articles mark."
 802   :group 'gnus-summary-visual
 803   :type '(repeat (cons (sexp :tag "Form" nil)
 804                        face)))
 805
 806 (defcustom gnus-alter-header-function nil
 807   "Function called to allow alteration of article header structures.
 808 The function is called with one parameter, the article header vector,
 809 which it may alter in any way.")
 810
 811 (defvar gnus-decode-encoded-word-function 'mail-decode-encoded-word-string
 812   "Variable that says which function should be used to decode a string with encoded words.")
 813
 814 (defcustom gnus-extra-headers nil
 815   "*Extra headers to parse."
 816   :version "21.1"
 817   :group 'gnus-summary
 818   :type '(repeat symbol))
 819
 820 (defcustom gnus-ignored-from-addresses
 821   (and user-mail-address (regexp-quote user-mail-address))
 822   "*Regexp of From headers that may be suppressed in favor of To headers."
 823   :version "21.1"
 824   :group 'gnus-summary
 825   :type 'regexp)
 826
 827 (defcustom gnus-group-charset-alist
 828   '(("^hk\\>\\|^tw\\>\\|\\<big5\\>" cn-big5)
 829     ("^cn\\>\\|\\<chinese\\>" cn-gb-2312)
 830     ("^fj\\>\\|^japan\\>" iso-2022-jp-2)
 831     ("^tnn\\>\\|^pin\\>\\|^sci.lang.japan" iso-2022-7bit)
 832     ("^relcom\\>" koi8-r)
 833     ("^fido7\\>" koi8-r)
 834     ("^\\(cz\\|hun\\|pl\\|sk\\|hr\\)\\>" iso-8859-2)
 835     ("^israel\\>" iso-8859-1)
 836     ("^han\\>" euc-kr)
 837     ("^alt.chinese.text.big5\\>" chinese-big5)
 838     ("^soc.culture.vietnamese\\>" vietnamese-viqr)
 839     ("^\\(comp\\|rec\\|alt\\|sci\\|soc\\|news\\|gnu\\|bofh\\)\\>" iso-8859-1)
 840     (".*" iso-8859-1))
 841   "Alist of regexps (to match group names) and default charsets to be used when reading."
 842   :type '(repeat (list (regexp :tag "Group")
 843                        (symbol :tag "Charset")))
 844   :group 'gnus-charset)
 845
 846 (defcustom gnus-newsgroup-ignored-charsets '(unknown-8bit x-unknown)
 847   "List of charsets that should be ignored.
 848 When these charsets are used in the \"charset\" parameter, the
 849 default charset will be used instead."
 850   :version "21.1"
 851   :type '(repeat symbol)
 852   :group 'gnus-charset)
 853
 854 (defcustom gnus-group-ignored-charsets-alist
 855   '(("alt\\.chinese\\.text" iso-8859-1))
 856   "Alist of regexps (to match group names) and charsets that should be ignored.
 857 When these charsets are used in the \"charset\" parameter, the
 858 default charset will be used instead."
 859   :type '(repeat (cons (regexp :tag "Group")
 860                        (repeat symbol)))
 861   :group 'gnus-charset)
 862
 863 (defcustom gnus-group-highlight-words-alist nil
 864   "Alist of group regexps and highlight regexps.
 865 This variable uses the same syntax as `gnus-emphasis-alist'."
 866   :version "21.1"
 867   :type '(repeat (cons (regexp :tag "Group")
 868                        (repeat (list (regexp :tag "Highlight regexp")
 869                                      (number :tag "Group for entire word" 0)
 870                                      (number :tag "Group for displayed part" 0)
 871                                      (symbol :tag "Face"
 872                                              gnus-emphasis-highlight-words)))))
 873   :group 'gnus-summary-visual)
 874
 875 (defcustom gnus-summary-show-article-charset-alist
 876   nil
 877   "Alist of number and charset.
 878 The article will be shown with the charset corresponding to the
 879 numbered argument.
 880 For example: ((1 . cn-gb-2312) (2 . big5))."
 881   :version "21.1"
 882   :type '(repeat (cons (number :tag "Argument" 1)
 883                        (symbol :tag "Charset")))
 884   :group 'gnus-charset)
 885
 886 (defcustom gnus-preserve-marks t
 887   "Whether marks are preserved when moving, copying and respooling messages."
 888   :version "21.1"
 889   :type 'boolean
 890   :group 'gnus-summary-marks)
 891
 892 (defcustom gnus-alter-articles-to-read-function nil
 893   "Function to be called to alter the list of articles to be selected."
 894   :type '(choice (const nil) function)
 895   :group 'gnus-summary)
 896
 897 (defcustom gnus-orphan-score nil
 898   "*All orphans get this score added.  Set in the score file."
 899   :group 'gnus-score-default
 900   :type '(choice (const nil)
 901                  integer))
 902
 903 (defcustom gnus-summary-save-parts-default-mime "image/.*"
 904   "*A regexp to match MIME parts when saving multiple parts of a message
 905 with gnus-summary-save-parts (X m). This regexp will be used by default
 906 when prompting the user for which type of files to save."
 907   :group 'gnus-summary
 908   :type 'regexp)
 909
 910
 911 ;;; Internal variables
 912
 913 (defvar gnus-article-mime-handles nil)
 914 (defvar gnus-article-decoded-p nil)
 915 (defvar gnus-scores-exclude-files nil)
 916 (defvar gnus-page-broken nil)
 917 (defvar gnus-inhibit-mime-unbuttonizing nil)
 918
 919 (defvar gnus-original-article nil)
 920 (defvar gnus-article-internal-prepare-hook nil)
 921 (defvar gnus-newsgroup-process-stack nil)
 922
 923 (defvar gnus-thread-indent-array nil)
 924 (defvar gnus-thread-indent-array-level gnus-thread-indent-level)
 925 (defvar gnus-sort-gathered-threads-function 'gnus-thread-sort-by-number
 926   "Function called to sort the articles within a thread after it has been gathered together.")
 927
 928 (defvar gnus-summary-save-parts-type-history nil)
 929 (defvar gnus-summary-save-parts-last-directory nil)
 930
 931 ;; Avoid highlighting in kill files.
 932 (defvar gnus-summary-inhibit-highlight nil)
 933 (defvar gnus-newsgroup-selected-overlay nil)
 934 (defvar gnus-inhibit-limiting nil)
 935 (defvar gnus-newsgroup-adaptive-score-file nil)
 936 (defvar gnus-current-score-file nil)
 937 (defvar gnus-current-move-group nil)
 938 (defvar gnus-current-copy-group nil)
 939 (defvar gnus-current-crosspost-group nil)
 940
 941 (defvar gnus-newsgroup-dependencies nil)
 942 (defvar gnus-newsgroup-adaptive nil)
 943 (defvar gnus-summary-display-article-function nil)
 944 (defvar gnus-summary-highlight-line-function nil
 945   "Function called after highlighting a summary line.")
 946
 947 (defvar gnus-summary-line-format-alist
 948   `((?N ,(macroexpand '(mail-header-number gnus-tmp-header)) ?d)
 949     (?S ,(macroexpand '(mail-header-subject gnus-tmp-header)) ?s)
 950     (?s gnus-tmp-subject-or-nil ?s)
 951     (?n gnus-tmp-name ?s)
 952     (?A (car (cdr (funcall gnus-extract-address-components gnus-tmp-from)))
 953         ?s)
 954     (?a (or (car (funcall gnus-extract-address-components gnus-tmp-from))
 955             gnus-tmp-from) ?s)
 956     (?F gnus-tmp-from ?s)
 957     (?x ,(macroexpand '(mail-header-xref gnus-tmp-header)) ?s)
 958     (?D ,(macroexpand '(mail-header-date gnus-tmp-header)) ?s)
 959     (?d (gnus-dd-mmm (mail-header-date gnus-tmp-header)) ?s)
 960     (?o (gnus-date-iso8601 (mail-header-date gnus-tmp-header)) ?s)
 961     (?M ,(macroexpand '(mail-header-id gnus-tmp-header)) ?s)
 962     (?r ,(macroexpand '(mail-header-references gnus-tmp-header)) ?s)
 963     (?c (or (mail-header-chars gnus-tmp-header) 0) ?d)
 964     (?L gnus-tmp-lines ?d)
 965     (?I gnus-tmp-indentation ?s)
 966     (?T (if (= gnus-tmp-level 0) "" (make-string (frame-width) ? )) ?s)
 967     (?R gnus-tmp-replied ?c)
 968     (?\[ gnus-tmp-opening-bracket ?c)
 969     (?\] gnus-tmp-closing-bracket ?c)
 970     (?\> (make-string gnus-tmp-level ? ) ?s)
 971     (?\< (make-string (max 0 (- 20 gnus-tmp-level)) ? ) ?s)
 972     (?i gnus-tmp-score ?d)
 973     (?z gnus-tmp-score-char ?c)
 974     (?l (bbb-grouplens-score gnus-tmp-header) ?s)
 975     (?V (gnus-thread-total-score (and (boundp 'thread) (car thread))) ?d)
 976     (?U gnus-tmp-unread ?c)
 977     (?f (gnus-summary-from-or-to-or-newsgroups gnus-tmp-header) ?s)
 978     (?t (gnus-summary-number-of-articles-in-thread
 979          (and (boundp 'thread) (car thread)) gnus-tmp-level)
 980         ?d)
 981     (?e (gnus-summary-number-of-articles-in-thread
 982          (and (boundp 'thread) (car thread)) gnus-tmp-level t)
 983         ?c)
 984     (?u gnus-tmp-user-defined ?s)
 985     (?P (gnus-pick-line-number) ?d))
 986   "An alist of format specifications that can appear in summary lines.
 987 These are paired with what variables they correspond with, along with
 988 the type of the variable (string, integer, character, etc).")
 989
 990 (defvar gnus-summary-dummy-line-format-alist
 991   `((?S gnus-tmp-subject ?s)
 992     (?N gnus-tmp-number ?d)
 993     (?u gnus-tmp-user-defined ?s)))
 994
 995 (defvar gnus-summary-mode-line-format-alist
 996   `((?G gnus-tmp-group-name ?s)
 997     (?g (gnus-short-group-name gnus-tmp-group-name) ?s)
 998     (?p (gnus-group-real-name gnus-tmp-group-name) ?s)
 999     (?A gnus-tmp-article-number ?d)
1000     (?Z gnus-tmp-unread-and-unselected ?s)
1001     (?V gnus-version ?s)
1002     (?U gnus-tmp-unread-and-unticked ?d)
1003     (?S gnus-tmp-subject ?s)
1004     (?e gnus-tmp-unselected ?d)
1005     (?u gnus-tmp-user-defined ?s)
1006     (?d (length gnus-newsgroup-dormant) ?d)
1007     (?t (length gnus-newsgroup-marked) ?d)
1008     (?r (length gnus-newsgroup-reads) ?d)
1009     (?z (gnus-summary-article-score gnus-tmp-article-number) ?d)
1010     (?E gnus-newsgroup-expunged-tally ?d)
1011     (?s (gnus-current-score-file-nondirectory) ?s)))
1012
1013 (defvar gnus-last-search-regexp nil
1014   "Default regexp for article search command.")
1015
1016 (defvar gnus-last-shell-command nil
1017   "Default shell command on article.")
1018
1019 (defvar gnus-newsgroup-begin nil)
1020 (defvar gnus-newsgroup-end nil)
1021 (defvar gnus-newsgroup-last-rmail nil)
1022 (defvar gnus-newsgroup-last-mail nil)
1023 (defvar gnus-newsgroup-last-folder nil)
1024 (defvar gnus-newsgroup-last-file nil)
1025 (defvar gnus-newsgroup-auto-expire nil)
1026 (defvar gnus-newsgroup-active nil)
1027
1028 (defvar gnus-newsgroup-data nil)
1029 (defvar gnus-newsgroup-data-reverse nil)
1030 (defvar gnus-newsgroup-limit nil)
1031 (defvar gnus-newsgroup-limits nil)
1032
1033 (defvar gnus-newsgroup-unreads nil
1034   "List of unread articles in the current newsgroup.")
1035
1036 (defvar gnus-newsgroup-unselected nil
1037   "List of unselected unread articles in the current newsgroup.")
1038
1039 (defvar gnus-newsgroup-reads nil
1040   "Alist of read articles and article marks in the current newsgroup.")
1041
1042 (defvar gnus-newsgroup-expunged-tally nil)
1043
1044 (defvar gnus-newsgroup-marked nil
1045   "List of ticked articles in the current newsgroup (a subset of unread art).")
1046
1047 (defvar gnus-newsgroup-killed nil
1048   "List of ranges of articles that have been through the scoring process.")
1049
1050 (defvar gnus-newsgroup-cached nil
1051   "List of articles that come from the article cache.")
1052
1053 (defvar gnus-newsgroup-saved nil
1054   "List of articles that have been saved.")
1055
1056 (defvar gnus-newsgroup-kill-headers nil)
1057
1058 (defvar gnus-newsgroup-replied nil
1059   "List of articles that have been replied to in the current newsgroup.")
1060
1061 (defvar gnus-newsgroup-expirable nil
1062   "List of articles in the current newsgroup that can be expired.")
1063
1064 (defvar gnus-newsgroup-processable nil
1065   "List of articles in the current newsgroup that can be processed.")
1066
1067 (defvar gnus-newsgroup-downloadable nil
1068   "List of articles in the current newsgroup that can be processed.")
1069
1070 (defvar gnus-newsgroup-undownloaded nil
1071   "List of articles in the current newsgroup that haven't been downloaded..")
1072
1073 (defvar gnus-newsgroup-unsendable nil
1074   "List of articles in the current newsgroup that won't be sent.")
1075
1076 (defvar gnus-newsgroup-bookmarks nil
1077   "List of articles in the current newsgroup that have bookmarks.")
1078
1079 (defvar gnus-newsgroup-dormant nil
1080   "List of dormant articles in the current newsgroup.")
1081
1082 (defvar gnus-newsgroup-scored nil
1083   "List of scored articles in the current newsgroup.")
1084
1085 (defvar gnus-newsgroup-headers nil
1086   "List of article headers in the current newsgroup.")
1087
1088 (defvar gnus-newsgroup-threads nil)
1089
1090 (defvar gnus-newsgroup-prepared nil
1091   "Whether the current group has been prepared properly.")
1092
1093 (defvar gnus-newsgroup-ancient nil
1094   "List of `gnus-fetch-old-headers' articles in the current newsgroup.")
1095
1096 (defvar gnus-newsgroup-sparse nil)
1097
1098 (defvar gnus-current-article nil)
1099 (defvar gnus-article-current nil)
1100 (defvar gnus-current-headers nil)
1101 (defvar gnus-have-all-headers nil)
1102 (defvar gnus-last-article nil)
1103 (defvar gnus-newsgroup-history nil)
1104 (defvar gnus-newsgroup-charset nil)
1105 (defvar gnus-newsgroup-ephemeral-charset nil)
1106 (defvar gnus-newsgroup-ephemeral-ignored-charsets nil)
1107
1108 (defconst gnus-summary-local-variables
1109   '(gnus-newsgroup-name
1110     gnus-newsgroup-begin gnus-newsgroup-end
1111     gnus-newsgroup-last-rmail gnus-newsgroup-last-mail
1112     gnus-newsgroup-last-folder gnus-newsgroup-last-file
1113     gnus-newsgroup-auto-expire gnus-newsgroup-unreads
1114     gnus-newsgroup-unselected gnus-newsgroup-marked
1115     gnus-newsgroup-reads gnus-newsgroup-saved
1116     gnus-newsgroup-replied gnus-newsgroup-expirable
1117     gnus-newsgroup-processable gnus-newsgroup-killed
1118     gnus-newsgroup-downloadable gnus-newsgroup-undownloaded
1119     gnus-newsgroup-unsendable
1120     gnus-newsgroup-bookmarks gnus-newsgroup-dormant
1121     gnus-newsgroup-headers gnus-newsgroup-threads
1122     gnus-newsgroup-prepared gnus-summary-highlight-line-function
1123     gnus-current-article gnus-current-headers gnus-have-all-headers
1124     gnus-last-article gnus-article-internal-prepare-hook
1125     gnus-newsgroup-dependencies gnus-newsgroup-selected-overlay
1126     gnus-newsgroup-scored gnus-newsgroup-kill-headers
1127     gnus-thread-expunge-below
1128     gnus-score-alist gnus-current-score-file
1129     (gnus-summary-expunge-below . global)
1130     (gnus-summary-mark-below . global)
1131     (gnus-orphan-score . global)
1132     gnus-newsgroup-active gnus-scores-exclude-files
1133     gnus-newsgroup-history gnus-newsgroup-ancient
1134     gnus-newsgroup-sparse gnus-newsgroup-process-stack
1135     (gnus-newsgroup-adaptive . gnus-use-adaptive-scoring)
1136     gnus-newsgroup-adaptive-score-file (gnus-reffed-article-number . -1)
1137     (gnus-newsgroup-expunged-tally . 0)
1138     gnus-cache-removable-articles gnus-newsgroup-cached
1139     gnus-newsgroup-data gnus-newsgroup-data-reverse
1140     gnus-newsgroup-limit gnus-newsgroup-limits
1141     gnus-newsgroup-charset)
1142   "Variables that are buffer-local to the summary buffers.")
1143
1144 ;; Byte-compiler warning.
1145 (eval-when-compile (defvar gnus-article-mode-map))
1146
1147 ;; MIME stuff.
1148
1149 (defvar gnus-decode-encoded-word-methods
1150   '(mail-decode-encoded-word-string)
1151   "List of methods used to decode encoded words.
1152
1153 This variable is a list of FUNCTION or (REGEXP . FUNCTION).  If item is
1154 FUNCTION, FUNCTION will be apply to all newsgroups.  If item is a
1155 (REGEXP . FUNCTION), FUNCTION will be only apply to thes newsgroups
1156 whose names match REGEXP.
1157
1158 For example:
1159 ((\"chinese\" . gnus-decode-encoded-word-string-by-guess)
1160  mail-decode-encoded-word-string
1161  (\"chinese\" . rfc1843-decode-string))")
1162
1163 (defvar gnus-decode-encoded-word-methods-cache nil)
1164
1165 (defun gnus-multi-decode-encoded-word-string (string)
1166   "Apply the functions from `gnus-encoded-word-methods' that match."
1167   (unless (and gnus-decode-encoded-word-methods-cache
1168                (eq gnus-newsgroup-name
1169                    (car gnus-decode-encoded-word-methods-cache)))
1170     (setq gnus-decode-encoded-word-methods-cache (list gnus-newsgroup-name))
1171     (mapcar (lambda (x)
1172               (if (symbolp x)
1173                   (nconc gnus-decode-encoded-word-methods-cache (list x))
1174                 (if (and gnus-newsgroup-name
1175                          (string-match (car x) gnus-newsgroup-name))
1176                     (nconc gnus-decode-encoded-word-methods-cache
1177                            (list (cdr x))))))
1178           gnus-decode-encoded-word-methods))
1179   (let ((xlist gnus-decode-encoded-word-methods-cache))
1180     (pop xlist)
1181     (while xlist
1182       (setq string (funcall (pop xlist) string))))
1183   string)
1184
1185 ;; Subject simplification.
1186
1187 (defun gnus-simplify-whitespace (str)
1188   "Remove excessive whitespace from STR."
1189   (let ((mystr str))
1190     ;; Multiple spaces.
1191     (while (string-match "[ \t][ \t]+" mystr)
1192       (setq mystr (concat (substring mystr 0 (match-beginning 0))
1193                           " "
1194                           (substring mystr (match-end 0)))))
1195     ;; Leading spaces.
1196     (when (string-match "^[ \t]+" mystr)
1197       (setq mystr (substring mystr (match-end 0))))
1198     ;; Trailing spaces.
1199     (when (string-match "[ \t]+$" mystr)
1200       (setq mystr (substring mystr 0 (match-beginning 0))))
1201     mystr))
1202
1203 (defsubst gnus-simplify-subject-re (subject)
1204   "Remove \"Re:\" from subject lines."
1205   (if (string-match "^[Rr][Ee]: *" subject)
1206       (substring subject (match-end 0))
1207     subject))
1208
1209 (defun gnus-simplify-subject (subject &optional re-only)
1210   "Remove `Re:' and words in parentheses.
1211 If RE-ONLY is non-nil, strip leading `Re:'s only."
1212   (let ((case-fold-search t))           ;Ignore case.
1213     ;; Remove `Re:', `Re^N:', `Re(n)', and `Re[n]:'.
1214     (when (string-match "\\`\\(re\\([[(^][0-9]+[])]?\\)?:[ \t]*\\)+" subject)
1215       (setq subject (substring subject (match-end 0))))
1216     ;; Remove uninteresting prefixes.
1217     (when (and (not re-only)
1218                gnus-simplify-ignored-prefixes
1219                (string-match gnus-simplify-ignored-prefixes subject))
1220       (setq subject (substring subject (match-end 0))))
1221     ;; Remove words in parentheses from end.
1222     (unless re-only
1223       (while (string-match "[ \t\n]*([^()]*)[ \t\n]*\\'" subject)
1224         (setq subject (substring subject 0 (match-beginning 0)))))
1225     ;; Return subject string.
1226     subject))
1227
1228 ;; Remove any leading "re:"s, any trailing paren phrases, and simplify
1229 ;; all whitespace.
1230 (defsubst gnus-simplify-buffer-fuzzy-step (regexp &optional newtext)
1231   (goto-char (point-min))
1232   (while (re-search-forward regexp nil t)
1233     (replace-match (or newtext ""))))
1234
1235 (defun gnus-simplify-buffer-fuzzy ()
1236   "Simplify string in the buffer fuzzily.
1237 The string in the accessible portion of the current buffer is simplified.
1238 It is assumed to be a single-line subject.
1239 Whitespace is generally cleaned up, and miscellaneous leading/trailing
1240 matter is removed.  Additional things can be deleted by setting
1241 `gnus-simplify-subject-fuzzy-regexp'."
1242   (let ((case-fold-search t)
1243         (modified-tick))
1244     (gnus-simplify-buffer-fuzzy-step "\t" " ")
1245
1246     (while (not (eq modified-tick (buffer-modified-tick)))
1247       (setq modified-tick (buffer-modified-tick))
1248       (cond
1249        ((listp gnus-simplify-subject-fuzzy-regexp)
1250         (mapcar 'gnus-simplify-buffer-fuzzy-step
1251                 gnus-simplify-subject-fuzzy-regexp))
1252        (gnus-simplify-subject-fuzzy-regexp
1253         (gnus-simplify-buffer-fuzzy-step gnus-simplify-subject-fuzzy-regexp)))
1254       (gnus-simplify-buffer-fuzzy-step "^ *\\[[-+?*!][-+?*!]\\] *")
1255       (gnus-simplify-buffer-fuzzy-step
1256        "^ *\\(re\\|fw\\|fwd\\)[[{(^0-9]*[])}]?[:;] *")
1257       (gnus-simplify-buffer-fuzzy-step "^[[].*:\\( .*\\)[]]$" "\\1"))
1258
1259     (gnus-simplify-buffer-fuzzy-step " *[[{(][^()\n]*[]})] *$")
1260     (gnus-simplify-buffer-fuzzy-step "  +" " ")
1261     (gnus-simplify-buffer-fuzzy-step " $")
1262     (gnus-simplify-buffer-fuzzy-step "^ +")))
1263
1264 (defun gnus-simplify-subject-fuzzy (subject)
1265   "Simplify a subject string fuzzily.
1266 See `gnus-simplify-buffer-fuzzy' for details."
1267   (save-excursion
1268     (gnus-set-work-buffer)
1269     (let ((case-fold-search t))
1270       ;; Remove uninteresting prefixes.
1271       (when (and gnus-simplify-ignored-prefixes
1272                  (string-match gnus-simplify-ignored-prefixes subject))
1273         (setq subject (substring subject (match-end 0))))
1274       (insert subject)
1275       (inline (gnus-simplify-buffer-fuzzy))
1276       (buffer-string))))
1277
1278 (defsubst gnus-simplify-subject-fully (subject)
1279   "Simplify a subject string according to gnus-summary-gather-subject-limit."
1280   (cond
1281    (gnus-simplify-subject-functions
1282     (gnus-map-function gnus-simplify-subject-functions subject))
1283    ((null gnus-summary-gather-subject-limit)
1284     (gnus-simplify-subject-re subject))
1285    ((eq gnus-summary-gather-subject-limit 'fuzzy)
1286     (gnus-simplify-subject-fuzzy subject))
1287    ((numberp gnus-summary-gather-subject-limit)
1288     (gnus-limit-string (gnus-simplify-subject-re subject)
1289                        gnus-summary-gather-subject-limit))
1290    (t
1291     subject)))
1292
1293 (defsubst gnus-subject-equal (s1 s2 &optional simple-first)
1294   "Check whether two subjects are equal.
1295 If optional argument simple-first is t, first argument is already
1296 simplified."
1297   (cond
1298    ((null simple-first)
1299     (equal (gnus-simplify-subject-fully s1)
1300            (gnus-simplify-subject-fully s2)))
1301    (t
1302     (equal s1
1303            (gnus-simplify-subject-fully s2)))))
1304
1305 (defun gnus-summary-bubble-group ()
1306   "Increase the score of the current group.
1307 This is a handy function to add to `gnus-summary-exit-hook' to
1308 increase the score of each group you read."
1309   (gnus-group-add-score gnus-newsgroup-name))
1310
1311 \f
1312 ;;;
1313 ;;; Gnus summary mode
1314 ;;;
1315
1316 (put 'gnus-summary-mode 'mode-class 'special)
1317
1318 (defvar gnus-article-commands-menu)
1319
1320 (when t
1321   ;; Non-orthogonal keys
1322
1323   (gnus-define-keys gnus-summary-mode-map
1324     " " gnus-summary-next-page
1325     "\177" gnus-summary-prev-page
1326     [delete] gnus-summary-prev-page
1327     [backspace] gnus-summary-prev-page
1328     "\r" gnus-summary-scroll-up
1329     "\M-\r" gnus-summary-scroll-down
1330     "n" gnus-summary-next-unread-article
1331     "p" gnus-summary-prev-unread-article
1332     "N" gnus-summary-next-article
1333     "P" gnus-summary-prev-article
1334     "\M-\C-n" gnus-summary-next-same-subject
1335     "\M-\C-p" gnus-summary-prev-same-subject
1336     "\M-n" gnus-summary-next-unread-subject
1337     "\M-p" gnus-summary-prev-unread-subject
1338     "." gnus-summary-first-unread-article
1339     "," gnus-summary-best-unread-article
1340     "\M-s" gnus-summary-search-article-forward
1341     "\M-r" gnus-summary-search-article-backward
1342     "<" gnus-summary-beginning-of-article
1343     ">" gnus-summary-end-of-article
1344     "j" gnus-summary-goto-article
1345     "^" gnus-summary-refer-parent-article
1346     "\M-^" gnus-summary-refer-article
1347     "u" gnus-summary-tick-article-forward
1348     "!" gnus-summary-tick-article-forward
1349     "U" gnus-summary-tick-article-backward
1350     "d" gnus-summary-mark-as-read-forward
1351     "D" gnus-summary-mark-as-read-backward
1352     "E" gnus-summary-mark-as-expirable
1353     "\M-u" gnus-summary-clear-mark-forward
1354     "\M-U" gnus-summary-clear-mark-backward
1355     "k" gnus-summary-kill-same-subject-and-select
1356     "\C-k" gnus-summary-kill-same-subject
1357     "\M-\C-k" gnus-summary-kill-thread
1358     "\M-\C-l" gnus-summary-lower-thread
1359     "e" gnus-summary-edit-article
1360     "#" gnus-summary-mark-as-processable
1361     "\M-#" gnus-summary-unmark-as-processable
1362     "\M-\C-t" gnus-summary-toggle-threads
1363     "\M-\C-s" gnus-summary-show-thread
1364     "\M-\C-h" gnus-summary-hide-thread
1365     "\M-\C-f" gnus-summary-next-thread
1366     "\M-\C-b" gnus-summary-prev-thread
1367     [(meta down)] gnus-summary-next-thread
1368     [(meta up)] gnus-summary-prev-thread
1369     "\M-\C-u" gnus-summary-up-thread
1370     "\M-\C-d" gnus-summary-down-thread
1371     "&" gnus-summary-execute-command
1372     "c" gnus-summary-catchup-and-exit
1373     "\C-w" gnus-summary-mark-region-as-read
1374     "\C-t" gnus-summary-toggle-truncation
1375     "?" gnus-summary-mark-as-dormant
1376     "\C-c\M-\C-s" gnus-summary-limit-include-expunged
1377     "\C-c\C-s\C-n" gnus-summary-sort-by-number
1378     "\C-c\C-s\C-l" gnus-summary-sort-by-lines
1379     "\C-c\C-s\C-c" gnus-summary-sort-by-chars
1380     "\C-c\C-s\C-a" gnus-summary-sort-by-author
1381     "\C-c\C-s\C-s" gnus-summary-sort-by-subject
1382     "\C-c\C-s\C-d" gnus-summary-sort-by-date
1383     "\C-c\C-s\C-i" gnus-summary-sort-by-score
1384     "=" gnus-summary-expand-window
1385     "\C-x\C-s" gnus-summary-reselect-current-group
1386     "\M-g" gnus-summary-rescan-group
1387     "w" gnus-summary-stop-page-breaking
1388     "\C-c\C-r" gnus-summary-caesar-message
1389     "f" gnus-summary-followup
1390     "F" gnus-summary-followup-with-original
1391     "C" gnus-summary-cancel-article
1392     "r" gnus-summary-reply
1393     "R" gnus-summary-reply-with-original
1394     "\C-c\C-f" gnus-summary-mail-forward
1395     "o" gnus-summary-save-article
1396     "\C-o" gnus-summary-save-article-mail
1397     "|" gnus-summary-pipe-output
1398     "\M-k" gnus-summary-edit-local-kill
1399     "\M-K" gnus-summary-edit-global-kill
1400     ;; "V" gnus-version
1401     "\C-c\C-d" gnus-summary-describe-group
1402     "q" gnus-summary-exit
1403     "Q" gnus-summary-exit-no-update
1404     "\C-c\C-i" gnus-info-find-node
1405     gnus-mouse-2 gnus-mouse-pick-article
1406     "m" gnus-summary-mail-other-window
1407     "a" gnus-summary-post-news
1408     "x" gnus-summary-limit-to-unread
1409     "s" gnus-summary-isearch-article
1410     "t" gnus-summary-toggle-header
1411     "g" gnus-summary-show-article
1412     "l" gnus-summary-goto-last-article
1413     "\C-c\C-v\C-v" gnus-uu-decode-uu-view
1414     "\C-d" gnus-summary-enter-digest-group
1415     "\M-\C-d" gnus-summary-read-document
1416     "\M-\C-e" gnus-summary-edit-parameters
1417     "\M-\C-a" gnus-summary-customize-parameters
1418     "\C-c\C-b" gnus-bug
1419     "*" gnus-cache-enter-article
1420     "\M-*" gnus-cache-remove-article
1421     "\M-&" gnus-summary-universal-argument
1422     "\C-l" gnus-recenter
1423     "I" gnus-summary-increase-score
1424     "L" gnus-summary-lower-score
1425     "\M-i" gnus-symbolic-argument
1426     "h" gnus-summary-select-article-buffer
1427
1428     "b" gnus-article-view-part
1429     "\M-t" gnus-summary-toggle-display-buttonized
1430
1431     "V" gnus-summary-score-map
1432     "X" gnus-uu-extract-map
1433     "S" gnus-summary-send-map)
1434
1435   ;; Sort of orthogonal keymap
1436   (gnus-define-keys (gnus-summary-mark-map "M" gnus-summary-mode-map)
1437     "t" gnus-summary-tick-article-forward
1438     "!" gnus-summary-tick-article-forward
1439     "d" gnus-summary-mark-as-read-forward
1440     "r" gnus-summary-mark-as-read-forward
1441     "c" gnus-summary-clear-mark-forward
1442     " " gnus-summary-clear-mark-forward
1443     "e" gnus-summary-mark-as-expirable
1444     "x" gnus-summary-mark-as-expirable
1445     "?" gnus-summary-mark-as-dormant
1446     "b" gnus-summary-set-bookmark
1447     "B" gnus-summary-remove-bookmark
1448     "#" gnus-summary-mark-as-processable
1449     "\M-#" gnus-summary-unmark-as-processable
1450     "S" gnus-summary-limit-include-expunged
1451     "C" gnus-summary-catchup
1452     "H" gnus-summary-catchup-to-here
1453     "\C-c" gnus-summary-catchup-all
1454     "k" gnus-summary-kill-same-subject-and-select
1455     "K" gnus-summary-kill-same-subject
1456     "P" gnus-uu-mark-map)
1457
1458   (gnus-define-keys (gnus-summary-mscore-map "V" gnus-summary-mark-map)
1459     "c" gnus-summary-clear-above
1460     "u" gnus-summary-tick-above
1461     "m" gnus-summary-mark-above
1462     "k" gnus-summary-kill-below)
1463
1464   (gnus-define-keys (gnus-summary-limit-map "/" gnus-summary-mode-map)
1465     "/" gnus-summary-limit-to-subject
1466     "n" gnus-summary-limit-to-articles
1467     "w" gnus-summary-pop-limit
1468     "s" gnus-summary-limit-to-subject
1469     "a" gnus-summary-limit-to-author
1470     "u" gnus-summary-limit-to-unread
1471     "m" gnus-summary-limit-to-marks
1472     "M" gnus-summary-limit-exclude-marks
1473     "v" gnus-summary-limit-to-score
1474     "*" gnus-summary-limit-include-cached
1475     "D" gnus-summary-limit-include-dormant
1476     "T" gnus-summary-limit-include-thread
1477     "d" gnus-summary-limit-exclude-dormant
1478     "t" gnus-summary-limit-to-age
1479     "x" gnus-summary-limit-to-extra
1480     "E" gnus-summary-limit-include-expunged
1481     "c" gnus-summary-limit-exclude-childless-dormant
1482     "C" gnus-summary-limit-mark-excluded-as-read)
1483
1484   (gnus-define-keys (gnus-summary-goto-map "G" gnus-summary-mode-map)
1485     "n" gnus-summary-next-unread-article
1486     "p" gnus-summary-prev-unread-article
1487     "N" gnus-summary-next-article
1488     "P" gnus-summary-prev-article
1489     "\C-n" gnus-summary-next-same-subject
1490     "\C-p" gnus-summary-prev-same-subject
1491     "\M-n" gnus-summary-next-unread-subject
1492     "\M-p" gnus-summary-prev-unread-subject
1493     "f" gnus-summary-first-unread-article
1494     "b" gnus-summary-best-unread-article
1495     "j" gnus-summary-goto-article
1496     "g" gnus-summary-goto-subject
1497     "l" gnus-summary-goto-last-article
1498     "o" gnus-summary-pop-article)
1499
1500   (gnus-define-keys (gnus-summary-thread-map "T" gnus-summary-mode-map)
1501     "k" gnus-summary-kill-thread
1502     "l" gnus-summary-lower-thread
1503     "i" gnus-summary-raise-thread
1504     "T" gnus-summary-toggle-threads
1505     "t" gnus-summary-rethread-current
1506     "^" gnus-summary-reparent-thread
1507     "s" gnus-summary-show-thread
1508     "S" gnus-summary-show-all-threads
1509     "h" gnus-summary-hide-thread
1510     "H" gnus-summary-hide-all-threads
1511     "n" gnus-summary-next-thread
1512     "p" gnus-summary-prev-thread
1513     "u" gnus-summary-up-thread
1514     "o" gnus-summary-top-thread
1515     "d" gnus-summary-down-thread
1516     "#" gnus-uu-mark-thread
1517     "\M-#" gnus-uu-unmark-thread)
1518
1519   (gnus-define-keys (gnus-summary-buffer-map "Y" gnus-summary-mode-map)
1520     "g" gnus-summary-prepare
1521     "c" gnus-summary-insert-cached-articles)
1522
1523   (gnus-define-keys (gnus-summary-exit-map "Z" gnus-summary-mode-map)
1524     "c" gnus-summary-catchup-and-exit
1525     "C" gnus-summary-catchup-all-and-exit
1526     "E" gnus-summary-exit-no-update
1527     "Q" gnus-summary-exit
1528     "Z" gnus-summary-exit
1529     "n" gnus-summary-catchup-and-goto-next-group
1530     "R" gnus-summary-reselect-current-group
1531     "G" gnus-summary-rescan-group
1532     "N" gnus-summary-next-group
1533     "s" gnus-summary-save-newsrc
1534     "P" gnus-summary-prev-group)
1535
1536   (gnus-define-keys (gnus-summary-article-map "A" gnus-summary-mode-map)
1537     " " gnus-summary-next-page
1538     "n" gnus-summary-next-page
1539     "\177" gnus-summary-prev-page
1540     [delete] gnus-summary-prev-page
1541     "p" gnus-summary-prev-page
1542     "\r" gnus-summary-scroll-up
1543     "\M-\r" gnus-summary-scroll-down
1544     "<" gnus-summary-beginning-of-article
1545     ">" gnus-summary-end-of-article
1546     "b" gnus-summary-beginning-of-article
1547     "e" gnus-summary-end-of-article
1548     "^" gnus-summary-refer-parent-article
1549     "r" gnus-summary-refer-parent-article
1550     "D" gnus-summary-enter-digest-group
1551     "R" gnus-summary-refer-references
1552     "T" gnus-summary-refer-thread
1553     "g" gnus-summary-show-article
1554     "s" gnus-summary-isearch-article
1555     "P" gnus-summary-print-article
1556     "t" gnus-article-babel)
1557
1558   (gnus-define-keys (gnus-summary-wash-map "W" gnus-summary-mode-map)
1559     "b" gnus-article-add-buttons
1560     "B" gnus-article-add-buttons-to-head
1561     "o" gnus-article-treat-overstrike
1562     "e" gnus-article-emphasize
1563     "w" gnus-article-fill-cited-article
1564     "Q" gnus-article-fill-long-lines
1565     "C" gnus-article-capitalize-sentences
1566     "c" gnus-article-remove-cr
1567     "q" gnus-article-de-quoted-unreadable
1568     "6" gnus-article-de-base64-unreadable
1569     "Z" gnus-article-decode-HZ
1570     "h" gnus-article-wash-html
1571     "f" gnus-article-display-x-face
1572     "l" gnus-summary-stop-page-breaking
1573     "r" gnus-summary-caesar-message
1574     "t" gnus-summary-toggle-header
1575     "v" gnus-summary-verbose-headers
1576     "H" gnus-article-strip-headers-in-body
1577     "d" gnus-article-treat-dumbquotes)
1578
1579   (gnus-define-keys (gnus-summary-wash-hide-map "W" gnus-summary-wash-map)
1580     "a" gnus-article-hide
1581     "h" gnus-article-hide-headers
1582     "b" gnus-article-hide-boring-headers
1583     "s" gnus-article-hide-signature
1584     "c" gnus-article-hide-citation
1585     "C" gnus-article-hide-citation-in-followups
1586     "l" gnus-article-hide-list-identifiers
1587     "p" gnus-article-hide-pgp
1588     "B" gnus-article-strip-banner
1589     "P" gnus-article-hide-pem
1590     "\C-c" gnus-article-hide-citation-maybe)
1591
1592   (gnus-define-keys (gnus-summary-wash-highlight-map "H" gnus-summary-wash-map)
1593     "a" gnus-article-highlight
1594     "h" gnus-article-highlight-headers
1595     "c" gnus-article-highlight-citation
1596     "s" gnus-article-highlight-signature)
1597
1598   (gnus-define-keys (gnus-summary-wash-mime-map "M" gnus-summary-wash-map)
1599     "w" gnus-article-decode-mime-words
1600     "c" gnus-article-decode-charset
1601     "v" gnus-mime-view-all-parts
1602     "b" gnus-article-view-part)
1603
1604   (gnus-define-keys (gnus-summary-wash-time-map "T" gnus-summary-wash-map)
1605     "z" gnus-article-date-ut
1606     "u" gnus-article-date-ut
1607     "l" gnus-article-date-local
1608     "e" gnus-article-date-lapsed
1609     "o" gnus-article-date-original
1610     "i" gnus-article-date-iso8601
1611     "s" gnus-article-date-user)
1612
1613   (gnus-define-keys (gnus-summary-wash-empty-map "E" gnus-summary-wash-map)
1614     "t" gnus-article-remove-trailing-blank-lines
1615     "l" gnus-article-strip-leading-blank-lines
1616     "m" gnus-article-strip-multiple-blank-lines
1617     "a" gnus-article-strip-blank-lines
1618     "A" gnus-article-strip-all-blank-lines
1619     "s" gnus-article-strip-leading-space
1620     "e" gnus-article-strip-trailing-space)
1621
1622   (gnus-define-keys (gnus-summary-help-map "H" gnus-summary-mode-map)
1623     "v" gnus-version
1624     "f" gnus-summary-fetch-faq
1625     "d" gnus-summary-describe-group
1626     "h" gnus-summary-describe-briefly
1627     "i" gnus-info-find-node)
1628
1629   (gnus-define-keys (gnus-summary-backend-map "B" gnus-summary-mode-map)
1630     "e" gnus-summary-expire-articles
1631     "\M-\C-e" gnus-summary-expire-articles-now
1632     "\177" gnus-summary-delete-article
1633     [delete] gnus-summary-delete-article
1634     [backspace] gnus-summary-delete-article
1635     "m" gnus-summary-move-article
1636     "r" gnus-summary-respool-article
1637     "w" gnus-summary-edit-article
1638     "c" gnus-summary-copy-article
1639     "B" gnus-summary-crosspost-article
1640     "q" gnus-summary-respool-query
1641     "t" gnus-summary-respool-trace
1642     "i" gnus-summary-import-article
1643     "p" gnus-summary-article-posted-p)
1644
1645   (gnus-define-keys (gnus-summary-save-map "O" gnus-summary-mode-map)
1646     "o" gnus-summary-save-article
1647     "m" gnus-summary-save-article-mail
1648     "F" gnus-summary-write-article-file
1649     "r" gnus-summary-save-article-rmail
1650     "f" gnus-summary-save-article-file
1651     "b" gnus-summary-save-article-body-file
1652     "h" gnus-summary-save-article-folder
1653     "v" gnus-summary-save-article-vm
1654     "p" gnus-summary-pipe-output
1655     "s" gnus-soup-add-article)
1656
1657   (gnus-define-keys (gnus-summary-mime-map "K" gnus-summary-mode-map)
1658     "b" gnus-summary-display-buttonized
1659     "m" gnus-summary-repair-multipart
1660     "v" gnus-article-view-part
1661     "o" gnus-article-save-part
1662     "c" gnus-article-copy-part
1663     "e" gnus-article-externalize-part
1664     "i" gnus-article-inline-part
1665     "|" gnus-article-pipe-part))
1666
1667 (defun gnus-summary-make-menu-bar ()
1668   (gnus-turn-off-edit-menu 'summary)
1669
1670   (unless (boundp 'gnus-summary-misc-menu)
1671
1672     (easy-menu-define
1673      gnus-summary-kill-menu gnus-summary-mode-map ""
1674      (cons
1675       "Score"
1676       (nconc
1677        (list
1678         ["Enter score..." gnus-summary-score-entry t]
1679         ["Customize" gnus-score-customize t])
1680        (gnus-make-score-map 'increase)
1681        (gnus-make-score-map 'lower)
1682        '(("Mark"
1683           ["Kill below" gnus-summary-kill-below t]
1684           ["Mark above" gnus-summary-mark-above t]
1685           ["Tick above" gnus-summary-tick-above t]
1686           ["Clear above" gnus-summary-clear-above t])
1687          ["Current score" gnus-summary-current-score t]
1688          ["Set score" gnus-summary-set-score t]
1689          ["Switch current score file..." gnus-score-change-score-file t]
1690          ["Set mark below..." gnus-score-set-mark-below t]
1691          ["Set expunge below..." gnus-score-set-expunge-below t]
1692          ["Edit current score file" gnus-score-edit-current-scores t]
1693          ["Edit score file" gnus-score-edit-file t]
1694          ["Trace score" gnus-score-find-trace t]
1695          ["Find words" gnus-score-find-favourite-words t]
1696          ["Rescore buffer" gnus-summary-rescore t]
1697          ["Increase score..." gnus-summary-increase-score t]
1698          ["Lower score..." gnus-summary-lower-score t]))))
1699
1700     ;; Define both the Article menu in the summary buffer and the equivalent
1701     ;; Commands menu in the article buffer here for consistency.
1702     (let ((innards
1703            '(("Hide"
1704               ["All" gnus-article-hide t]
1705               ["Headers" gnus-article-hide-headers t]
1706               ["Signature" gnus-article-hide-signature t]
1707               ["Citation" gnus-article-hide-citation t]
1708               ["List identifiers" gnus-article-hide-list-identifiers t]
1709               ["PGP" gnus-article-hide-pgp t]
1710               ["Banner" gnus-article-strip-banner t]
1711               ["Boring headers" gnus-article-hide-boring-headers t])
1712              ("Highlight"
1713               ["All" gnus-article-highlight t]
1714               ["Headers" gnus-article-highlight-headers t]
1715               ["Signature" gnus-article-highlight-signature t]
1716               ["Citation" gnus-article-highlight-citation t])
1717              ("MIME"
1718               ["Words" gnus-article-decode-mime-words t]
1719               ["Charset" gnus-article-decode-charset t]
1720               ["QP" gnus-article-de-quoted-unreadable t]
1721               ["Base64" gnus-article-de-base64-unreadable t]
1722               ["View all" gnus-mime-view-all-parts t])
1723              ("Date"
1724               ["Local" gnus-article-date-local t]
1725               ["ISO8601" gnus-article-date-iso8601 t]
1726               ["UT" gnus-article-date-ut t]
1727               ["Original" gnus-article-date-original t]
1728               ["Lapsed" gnus-article-date-lapsed t]
1729               ["User-defined" gnus-article-date-user t])
1730              ("Washing"
1731               ("Remove Blanks"
1732                ["Leading" gnus-article-strip-leading-blank-lines t]
1733                ["Multiple" gnus-article-strip-multiple-blank-lines t]
1734                ["Trailing" gnus-article-remove-trailing-blank-lines t]
1735                ["All of the above" gnus-article-strip-blank-lines t]
1736                ["All" gnus-article-strip-all-blank-lines t]
1737                ["Leading space" gnus-article-strip-leading-space t]
1738                ["Trailing space" gnus-article-strip-trailing-space t])
1739               ["Overstrike" gnus-article-treat-overstrike t]
1740               ["Dumb quotes" gnus-article-treat-dumbquotes t]
1741               ["Emphasis" gnus-article-emphasize t]
1742               ["Word wrap" gnus-article-fill-cited-article t]
1743               ["Fill long lines" gnus-article-fill-long-lines t]
1744               ["Capitalize sentences" gnus-article-capitalize-sentences t]
1745               ["CR" gnus-article-remove-cr t]
1746               ["Show X-Face" gnus-article-display-x-face t]
1747               ["Quoted-Printable" gnus-article-de-quoted-unreadable t]
1748               ["Base64" gnus-article-de-base64-unreadable t]
1749               ["Rot 13" gnus-summary-caesar-message
1750                :help "\"Caesar rotate\" article by 13"]
1751               ["Unix pipe" gnus-summary-pipe-message t]
1752               ["Add buttons" gnus-article-add-buttons t]
1753               ["Add buttons to head" gnus-article-add-buttons-to-head t]
1754               ["Stop page breaking" gnus-summary-stop-page-breaking t]
1755               ["Verbose header" gnus-summary-verbose-headers t]
1756               ["Toggle header" gnus-summary-toggle-header t]
1757               ["Html" gnus-article-wash-html t]
1758               ["HZ" gnus-article-decode-HZ t])
1759              ("Output"
1760               ["Save in default format" gnus-summary-save-article
1761                :help "Save article using default method"]
1762               ["Save in file" gnus-summary-save-article-file
1763                :help "Save article in file"]
1764               ["Save in Unix mail format" gnus-summary-save-article-mail t]
1765               ["Save in MH folder" gnus-summary-save-article-folder t]
1766               ["Save in VM folder" gnus-summary-save-article-vm t]
1767               ["Save in RMAIL mbox" gnus-summary-save-article-rmail t]
1768               ["Save body in file" gnus-summary-save-article-body-file t]
1769               ["Pipe through a filter" gnus-summary-pipe-output t]
1770               ["Add to SOUP packet" gnus-soup-add-article t]
1771               ["Print" gnus-summary-print-article t])
1772              ("Backend"
1773               ["Respool article..." gnus-summary-respool-article t]
1774               ["Move article..." gnus-summary-move-article
1775                (gnus-check-backend-function
1776                 'request-move-article gnus-newsgroup-name)]
1777               ["Copy article..." gnus-summary-copy-article t]
1778               ["Crosspost article..." gnus-summary-crosspost-article
1779                (gnus-check-backend-function
1780                 'request-replace-article gnus-newsgroup-name)]
1781               ["Import file..." gnus-summary-import-article t]
1782               ["Check if posted" gnus-summary-article-posted-p t]
1783               ["Edit article" gnus-summary-edit-article
1784                (not (gnus-group-read-only-p))]
1785               ["Delete article" gnus-summary-delete-article
1786                (gnus-check-backend-function
1787                 'request-expire-articles gnus-newsgroup-name)]
1788               ["Query respool" gnus-summary-respool-query t]
1789               ["Trace respool" gnus-summary-respool-trace t]
1790               ["Delete expirable articles" gnus-summary-expire-articles-now
1791                (gnus-check-backend-function
1792                 'request-expire-articles gnus-newsgroup-name)])
1793              ("Extract"
1794               ["Uudecode" gnus-uu-decode-uu
1795                :help "Decode uuencoded article(s)"]
1796               ["Uudecode and save" gnus-uu-decode-uu-and-save t]
1797               ["Unshar" gnus-uu-decode-unshar t]
1798               ["Unshar and save" gnus-uu-decode-unshar-and-save t]
1799               ["Save" gnus-uu-decode-save t]
1800               ["Binhex" gnus-uu-decode-binhex t]
1801               ["Postscript" gnus-uu-decode-postscript t])
1802              ("Cache"
1803               ["Enter article" gnus-cache-enter-article t]
1804               ["Remove article" gnus-cache-remove-article t])
1805              ["Translate" gnus-article-babel t]
1806              ["Select article buffer" gnus-summary-select-article-buffer t]
1807              ["Enter digest buffer" gnus-summary-enter-digest-group t]
1808              ["Isearch article..." gnus-summary-isearch-article t]
1809              ["Beginning of the article" gnus-summary-beginning-of-article t]
1810              ["End of the article" gnus-summary-end-of-article t]
1811              ["Fetch parent of article" gnus-summary-refer-parent-article t]
1812              ["Fetch referenced articles" gnus-summary-refer-references t]
1813              ["Fetch current thread" gnus-summary-refer-thread t]
1814              ["Fetch article with id..." gnus-summary-refer-article t]
1815              ["Redisplay" gnus-summary-show-article t])))
1816       (easy-menu-define
1817        gnus-summary-article-menu gnus-summary-mode-map ""
1818        (cons "Article" innards))
1819
1820       (if (not (keymapp gnus-summary-article-menu))
1821           (easy-menu-define
1822             gnus-article-commands-menu gnus-article-mode-map ""
1823             (cons "Commands" innards))
1824         ;; in Emacs, don't share menu.
1825         (setq gnus-article-commands-menu
1826               (copy-keymap gnus-summary-article-menu))
1827         (define-key gnus-article-mode-map [menu-bar commands]
1828           (cons "Commands" gnus-article-commands-menu))))
1829
1830     (easy-menu-define
1831      gnus-summary-thread-menu gnus-summary-mode-map ""
1832      '("Threads"
1833        ["Toggle threading" gnus-summary-toggle-threads t]
1834        ["Hide threads" gnus-summary-hide-all-threads t]
1835        ["Show threads" gnus-summary-show-all-threads t]
1836        ["Hide thread" gnus-summary-hide-thread t]
1837        ["Show thread" gnus-summary-show-thread t]
1838        ["Go to next thread" gnus-summary-next-thread t]
1839        ["Go to previous thread" gnus-summary-prev-thread t]
1840        ["Go down thread" gnus-summary-down-thread t]
1841        ["Go up thread" gnus-summary-up-thread t]
1842        ["Top of thread" gnus-summary-top-thread t]
1843        ["Mark thread as read" gnus-summary-kill-thread t]
1844        ["Lower thread score" gnus-summary-lower-thread t]
1845        ["Raise thread score" gnus-summary-raise-thread t]
1846        ["Rethread current" gnus-summary-rethread-current t]))
1847
1848     (easy-menu-define
1849      gnus-summary-post-menu gnus-summary-mode-map ""
1850      '("Post"
1851        ["Post an article" gnus-summary-post-news
1852         :help "Post an article"]
1853        ["Followup" gnus-summary-followup
1854         :help "Post followup to this article"]
1855        ["Followup and yank" gnus-summary-followup-with-original
1856         :help "Post followup to this article, quoting its contents"]
1857        ["Supersede article" gnus-summary-supersede-article t]
1858        ["Cancel article" gnus-summary-cancel-article
1859         :help "Cancel an article you posted"]
1860        ["Reply" gnus-summary-reply t]
1861        ["Reply and yank" gnus-summary-reply-with-original t]
1862        ["Wide reply" gnus-summary-wide-reply t]
1863        ["Wide reply and yank" gnus-summary-wide-reply-with-original
1864         :help "Mail a reply, quoting this article"]
1865        ["Mail forward" gnus-summary-mail-forward t]
1866        ["Post forward" gnus-summary-post-forward t]
1867        ["Digest and mail" gnus-uu-digest-mail-forward t]
1868        ["Digest and post" gnus-uu-digest-post-forward t]
1869        ["Resend message" gnus-summary-resend-message t]
1870        ["Send bounced mail" gnus-summary-resend-bounced-mail t]
1871        ["Send a mail" gnus-summary-mail-other-window t]
1872        ["Uuencode and post" gnus-uu-post-news
1873         :help "Post a uuencoded article"]
1874        ["Followup via news" gnus-summary-followup-to-mail t]
1875        ["Followup via news and yank"
1876         gnus-summary-followup-to-mail-with-original t]
1877        ;;("Draft"
1878        ;;["Send" gnus-summary-send-draft t]
1879        ;;["Send bounced" gnus-resend-bounced-mail t])
1880        ))
1881
1882     (easy-menu-define
1883      gnus-summary-misc-menu gnus-summary-mode-map ""
1884      '("Misc"
1885        ("Mark Read"
1886         ["Mark as read" gnus-summary-mark-as-read-forward t]
1887         ["Mark same subject and select"
1888          gnus-summary-kill-same-subject-and-select t]
1889         ["Mark same subject" gnus-summary-kill-same-subject t]
1890         ["Catchup" gnus-summary-catchup
1891          :help "Mark unread articles in this group as read"]
1892         ["Catchup all" gnus-summary-catchup-all t]
1893         ["Catchup to here" gnus-summary-catchup-to-here t]
1894         ["Catchup region" gnus-summary-mark-region-as-read t]
1895         ["Mark excluded" gnus-summary-limit-mark-excluded-as-read t])
1896        ("Mark Various"
1897         ["Tick" gnus-summary-tick-article-forward t]
1898         ["Mark as dormant" gnus-summary-mark-as-dormant t]
1899         ["Remove marks" gnus-summary-clear-mark-forward t]
1900         ["Set expirable mark" gnus-summary-mark-as-expirable t]
1901         ["Set bookmark" gnus-summary-set-bookmark t]
1902         ["Remove bookmark" gnus-summary-remove-bookmark t])
1903        ("Mark Limit"
1904         ["Marks..." gnus-summary-limit-to-marks t]
1905         ["Subject..." gnus-summary-limit-to-subject t]
1906         ["Author..." gnus-summary-limit-to-author t]
1907         ["Age..." gnus-summary-limit-to-age t]
1908         ["Extra..." gnus-summary-limit-to-extra t]
1909         ["Score" gnus-summary-limit-to-score t]
1910         ["Unread" gnus-summary-limit-to-unread t]
1911         ["Non-dormant" gnus-summary-limit-exclude-dormant t]
1912         ["Articles" gnus-summary-limit-to-articles t]
1913         ["Pop limit" gnus-summary-pop-limit t]
1914         ["Show dormant" gnus-summary-limit-include-dormant t]
1915         ["Hide childless dormant"
1916          gnus-summary-limit-exclude-childless-dormant t]
1917         ;;["Hide thread" gnus-summary-limit-exclude-thread t]
1918         ["Hide marked" gnus-summary-limit-exclude-marks t]
1919         ["Show expunged" gnus-summary-show-all-expunged t])
1920        ("Process Mark"
1921         ["Set mark" gnus-summary-mark-as-processable t]
1922         ["Remove mark" gnus-summary-unmark-as-processable t]
1923         ["Remove all marks" gnus-summary-unmark-all-processable t]
1924         ["Mark above" gnus-uu-mark-over t]
1925         ["Mark series" gnus-uu-mark-series t]
1926         ["Mark region" gnus-uu-mark-region t]
1927         ["Unmark region" gnus-uu-unmark-region t]
1928         ["Mark by regexp..." gnus-uu-mark-by-regexp t]
1929         ["Unmark by regexp..." gnus-uu-unmark-by-regexp t]
1930         ["Mark all" gnus-uu-mark-all t]
1931         ["Mark buffer" gnus-uu-mark-buffer t]
1932         ["Mark sparse" gnus-uu-mark-sparse t]
1933         ["Mark thread" gnus-uu-mark-thread t]
1934         ["Unmark thread" gnus-uu-unmark-thread t]
1935         ("Process Mark Sets"
1936          ["Kill" gnus-summary-kill-process-mark t]
1937          ["Yank" gnus-summary-yank-process-mark
1938           gnus-newsgroup-process-stack]
1939          ["Save" gnus-summary-save-process-mark t]))
1940        ("Scroll article"
1941         ["Page forward" gnus-summary-next-page
1942          :help "Show next page of article"]
1943         ["Page backward" gnus-summary-prev-page
1944          :help "Show previous page of article"]
1945         ["Line forward" gnus-summary-scroll-up t])
1946        ("Move"
1947         ["Next unread article" gnus-summary-next-unread-article t]
1948         ["Previous unread article" gnus-summary-prev-unread-article t]
1949         ["Next article" gnus-summary-next-article t]
1950         ["Previous article" gnus-summary-prev-article t]
1951         ["Next unread subject" gnus-summary-next-unread-subject t]
1952         ["Previous unread subject" gnus-summary-prev-unread-subject t]
1953         ["Next article same subject" gnus-summary-next-same-subject t]
1954         ["Previous article same subject" gnus-summary-prev-same-subject t]
1955         ["First unread article" gnus-summary-first-unread-article t]
1956         ["Best unread article" gnus-summary-best-unread-article t]
1957         ["Go to subject number..." gnus-summary-goto-subject t]
1958         ["Go to article number..." gnus-summary-goto-article t]
1959         ["Go to the last article" gnus-summary-goto-last-article t]
1960         ["Pop article off history" gnus-summary-pop-article t])
1961        ("Sort"
1962         ["Sort by number" gnus-summary-sort-by-number t]
1963         ["Sort by author" gnus-summary-sort-by-author t]
1964         ["Sort by subject" gnus-summary-sort-by-subject t]
1965         ["Sort by date" gnus-summary-sort-by-date t]
1966         ["Sort by score" gnus-summary-sort-by-score t]
1967         ["Sort by lines" gnus-summary-sort-by-lines t]
1968         ["Sort by characters" gnus-summary-sort-by-chars t])
1969        ("Help"
1970         ["Fetch group FAQ" gnus-summary-fetch-faq t]
1971         ["Describe group" gnus-summary-describe-group t]
1972         ["Read manual" gnus-info-find-node t])
1973        ("Modes"
1974         ["Pick and read" gnus-pick-mode t]
1975         ["Binary" gnus-binary-mode t])
1976        ("Regeneration"
1977         ["Regenerate" gnus-summary-prepare t]
1978         ["Insert cached articles" gnus-summary-insert-cached-articles t]
1979         ["Toggle threading" gnus-summary-toggle-threads t])
1980        ["Filter articles..." gnus-summary-execute-command t]
1981        ["Run command on subjects..." gnus-summary-universal-argument t]
1982        ["Search articles forward..." gnus-summary-search-article-forward t]
1983        ["Search articles backward..." gnus-summary-search-article-backward t]
1984        ["Toggle line truncation" gnus-summary-toggle-truncation t]
1985        ["Expand window" gnus-summary-expand-window t]
1986        ["Expire expirable articles" gnus-summary-expire-articles
1987         (gnus-check-backend-function
1988          'request-expire-articles gnus-newsgroup-name)]
1989        ["Edit local kill file" gnus-summary-edit-local-kill t]
1990        ["Edit main kill file" gnus-summary-edit-global-kill t]
1991        ["Edit group parameters" gnus-summary-edit-parameters t]
1992        ["Customize group parameters" gnus-summary-customize-parameters t]
1993        ["Send a bug report" gnus-bug t]
1994        ("Exit"
1995         ["Catchup and exit" gnus-summary-catchup-and-exit
1996          :help "Mark unread articles in this group as read, then exit"]
1997         ["Catchup all and exit" gnus-summary-catchup-all-and-exit t]
1998         ["Catchup and goto next" gnus-summary-catchup-and-goto-next-group t]
1999         ["Exit group" gnus-summary-exit
2000          :help "Exit current group, return to group selection mode"]
2001         ["Exit group without updating" gnus-summary-exit-no-update t]
2002         ["Exit and goto next group" gnus-summary-next-group t]
2003         ["Exit and goto prev group" gnus-summary-prev-group t]
2004         ["Reselect group" gnus-summary-reselect-current-group t]
2005         ["Rescan group" gnus-summary-rescan-group t]
2006         ["Update dribble" gnus-summary-save-newsrc t])))
2007
2008     (gnus-run-hooks 'gnus-summary-menu-hook)))
2009
2010 (defvar gnus-summary-tool-bar-map nil)
2011
2012 ;; Emacs 21 tool bar.  Should be no-op otherwise.
2013 ;; NB: A new function tool-bar-local-item-from-menu is added in Emacs
2014 ;; 21.2.50+.  Considering many users use Emacs 21, use
2015 ;; tool-bar-add-item-from-menu here.
2016 (defun gnus-summary-make-tool-bar ()
2017   (if (and
2018        (condition-case nil (require 'tool-bar) (error nil))
2019        (fboundp 'tool-bar-add-item-from-menu)
2020        (default-value 'tool-bar-mode)
2021        (not gnus-summary-tool-bar-map))
2022       (setq gnus-summary-tool-bar-map
2023             (let ((tool-bar-map (make-sparse-keymap)))
2024               (tool-bar-add-item-from-menu
2025                'gnus-summary-prev-unread "prev-ur" gnus-summary-mode-map)
2026               (tool-bar-add-item-from-menu
2027                'gnus-summary-next-unread "next-ur" gnus-summary-mode-map)
2028               (tool-bar-add-item-from-menu
2029                'gnus-summary-post-news "post" gnus-summary-mode-map)
2030               (tool-bar-add-item-from-menu
2031                'gnus-summary-followup-with-original "fuwo" gnus-summary-mode-map)
2032               (tool-bar-add-item-from-menu
2033                'gnus-summary-followup "followup" gnus-summary-mode-map)
2034               (tool-bar-add-item-from-menu
2035                'gnus-summary-reply-with-original "reply-wo" gnus-summary-mode-map)
2036               (tool-bar-add-item-from-menu
2037                'gnus-summary-reply "reply" gnus-summary-mode-map)
2038               (tool-bar-add-item-from-menu
2039                'gnus-summary-caesar-message "rot13" gnus-summary-mode-map)
2040               (tool-bar-add-item-from-menu
2041                'gnus-uu-decode-uu "uu-decode" gnus-summary-mode-map)
2042               (tool-bar-add-item-from-menu
2043                'gnus-summary-save-article-file "save-aif" gnus-summary-mode-map)
2044               (tool-bar-add-item-from-menu
2045                'gnus-summary-save-article "save-art" gnus-summary-mode-map)
2046               (tool-bar-add-item-from-menu
2047                'gnus-uu-post-news "uu-post" gnus-summary-mode-map)
2048               (tool-bar-add-item-from-menu
2049                'gnus-summary-catchup "catchup" gnus-summary-mode-map)
2050               (tool-bar-add-item-from-menu
2051                'gnus-summary-catchup-and-exit "cu-exit" gnus-summary-mode-map)
2052               (tool-bar-add-item-from-menu
2053                'gnus-summary-exit "exit-summ" gnus-summary-mode-map)
2054               tool-bar-map)))
2055   (if gnus-summary-tool-bar-map
2056       (set (make-local-variable 'tool-bar-map) gnus-summary-tool-bar-map)))
2057
2058 (defun gnus-score-set-default (var value)
2059   "A version of set that updates the GNU Emacs menu-bar."
2060   (set var value)
2061   ;; It is the message that forces the active status to be updated.
2062   (message ""))
2063
2064 (defun gnus-make-score-map (type)
2065   "Make a summary score map of type TYPE."
2066   (if t
2067       nil
2068     (let ((headers '(("author" "from" string)
2069                      ("subject" "subject" string)
2070                      ("article body" "body" string)
2071                      ("article head" "head" string)
2072                      ("xref" "xref" string)
2073                      ("extra header" "extra" string)
2074                      ("lines" "lines" number)
2075                      ("followups to author" "followup" string)))
2076           (types '((number ("less than" <)
2077                            ("greater than" >)
2078                            ("equal" =))
2079                    (string ("substring" s)
2080                            ("exact string" e)
2081                            ("fuzzy string" f)
2082                            ("regexp" r))))
2083           (perms '(("temporary" (current-time-string))
2084                    ("permanent" nil)
2085                    ("immediate" now)))
2086           header)
2087       (list
2088        (apply
2089         'nconc
2090         (list
2091          (if (eq type 'lower)
2092              "Lower score"
2093            "Increase score"))
2094         (let (outh)
2095           (while headers
2096             (setq header (car headers))
2097             (setq outh
2098                   (cons
2099                    (apply
2100                     'nconc
2101                     (list (car header))
2102                     (let ((ts (cdr (assoc (nth 2 header) types)))
2103                           outt)
2104                       (while ts
2105                         (setq outt
2106                               (cons
2107                                (apply
2108                                 'nconc
2109                                 (list (caar ts))
2110                                 (let ((ps perms)
2111                                       outp)
2112                                   (while ps
2113                                     (setq outp
2114                                           (cons
2115                                            (vector
2116                                             (caar ps)
2117                                             (list
2118                                              'gnus-summary-score-entry
2119                                              (nth 1 header)
2120                                              (if (or (string= (nth 1 header)
2121                                                               "head")
2122                                                      (string= (nth 1 header)
2123                                                               "body"))
2124                                                  ""
2125                                                (list 'gnus-summary-header
2126                                                      (nth 1 header)))
2127                                              (list 'quote (nth 1 (car ts)))
2128                                              (list 'gnus-score-delta-default
2129                                                    nil)
2130                                              (nth 1 (car ps))
2131                                              t)
2132                                             t)
2133                                            outp))
2134                                     (setq ps (cdr ps)))
2135                                   (list (nreverse outp))))
2136                                outt))
2137                         (setq ts (cdr ts)))
2138                       (list (nreverse outt))))
2139                    outh))
2140             (setq headers (cdr headers)))
2141           (list (nreverse outh))))))))
2142
2143 \f
2144
2145 (defun gnus-summary-mode (&optional group)
2146   "Major mode for reading articles.
2147
2148 All normal editing commands are switched off.
2149 \\<gnus-summary-mode-map>
2150 Each line in this buffer represents one article.  To read an
2151 article, you can, for instance, type `\\[gnus-summary-next-page]'.  To move forwards
2152 and backwards while displaying articles, type `\\[gnus-summary-next-unread-article]' and `\\[gnus-summary-prev-unread-article]',
2153 respectively.
2154
2155 You can also post articles and send mail from this buffer.  To
2156 follow up an article, type `\\[gnus-summary-followup]'.  To mail a reply to the author
2157 of an article, type `\\[gnus-summary-reply]'.
2158
2159 There are approx. one gazillion commands you can execute in this
2160 buffer; read the info pages for more information (`\\[gnus-info-find-node]').
2161
2162 The following commands are available:
2163
2164 \\{gnus-summary-mode-map}"
2165   (interactive)
2166   (kill-all-local-variables)
2167   (when (gnus-visual-p 'summary-menu 'menu)
2168     (gnus-summary-make-menu-bar)
2169     (gnus-summary-make-tool-bar))
2170   (gnus-summary-make-local-variables)
2171   (gnus-make-thread-indent-array)
2172   (gnus-simplify-mode-line)
2173   (setq major-mode 'gnus-summary-mode)
2174   (setq mode-name "Summary")
2175   (make-local-variable 'minor-mode-alist)
2176   (use-local-map gnus-summary-mode-map)
2177   (buffer-disable-undo)
2178   (setq buffer-read-only t)             ;Disable modification
2179   (setq truncate-lines t)
2180   (setq selective-display t)
2181   (setq selective-display-ellipses t)   ;Display `...'
2182   (gnus-summary-set-display-table)
2183   (gnus-set-default-directory)
2184   (setq gnus-newsgroup-name group)
2185   (make-local-variable 'gnus-summary-line-format)
2186   (make-local-variable 'gnus-summary-line-format-spec)
2187   (make-local-variable 'gnus-summary-dummy-line-format)
2188   (make-local-variable 'gnus-summary-dummy-line-format-spec)
2189   (make-local-variable 'gnus-summary-mark-positions)
2190   (make-local-hook 'pre-command-hook)
2191   (add-hook 'pre-command-hook 'gnus-set-global-variables nil t)
2192   (gnus-run-hooks 'gnus-summary-mode-hook)
2193   (mm-enable-multibyte-mule4)
2194   (gnus-update-format-specifications nil 'summary 'summary-mode 'summary-dummy)
2195   (gnus-update-summary-mark-positions))
2196
2197 (defun gnus-summary-make-local-variables ()
2198   "Make all the local summary buffer variables."
2199   (let (global)
2200     (dolist (local gnus-summary-local-variables)
2201       (if (consp local)
2202           (progn
2203             (if (eq (cdr local) 'global)
2204                 ;; Copy the global value of the variable.
2205                 (setq global (symbol-value (car local)))
2206               ;; Use the value from the list.
2207               (setq global (eval (cdr local))))
2208             (set (make-local-variable (car local)) global))
2209         ;; Simple nil-valued local variable.
2210         (set (make-local-variable local) nil)))))
2211
2212 (defun gnus-summary-clear-local-variables ()
2213   (let ((locals gnus-summary-local-variables))
2214     (while locals
2215       (if (consp (car locals))
2216           (and (vectorp (caar locals))
2217                (set (caar locals) nil))
2218         (and (vectorp (car locals))
2219              (set (car locals) nil)))
2220       (setq locals (cdr locals)))))
2221
2222 ;; Summary data functions.
2223
2224 (defmacro gnus-data-number (data)
2225   `(car ,data))
2226
2227 (defmacro gnus-data-set-number (data number)
2228   `(setcar ,data ,number))
2229
2230 (defmacro gnus-data-mark (data)
2231   `(nth 1 ,data))
2232
2233 (defmacro gnus-data-set-mark (data mark)
2234   `(setcar (nthcdr 1 ,data) ,mark))
2235
2236 (defmacro gnus-data-pos (data)
2237   `(nth 2 ,data))
2238
2239 (defmacro gnus-data-set-pos (data pos)
2240   `(setcar (nthcdr 2 ,data) ,pos))
2241
2242 (defmacro gnus-data-header (data)
2243   `(nth 3 ,data))
2244
2245 (defmacro gnus-data-set-header (data header)
2246   `(setf (nth 3 ,data) ,header))
2247
2248 (defmacro gnus-data-level (data)
2249   `(nth 4 ,data))
2250
2251 (defmacro gnus-data-unread-p (data)
2252   `(= (nth 1 ,data) gnus-unread-mark))
2253
2254 (defmacro gnus-data-read-p (data)
2255   `(/= (nth 1 ,data) gnus-unread-mark))
2256
2257 (defmacro gnus-data-pseudo-p (data)
2258   `(consp (nth 3 ,data)))
2259
2260 (defmacro gnus-data-find (number)
2261   `(assq ,number gnus-newsgroup-data))
2262
2263 (defmacro gnus-data-find-list (number &optional data)
2264   `(let ((bdata ,(or data 'gnus-newsgroup-data)))
2265      (memq (assq ,number bdata)
2266            bdata)))
2267
2268 (defmacro gnus-data-make (number mark pos header level)
2269   `(list ,number ,mark ,pos ,header ,level))
2270
2271 (defun gnus-data-enter (after-article number mark pos header level offset)
2272   (let ((data (gnus-data-find-list after-article)))
2273     (unless data
2274       (error "No such article: %d" after-article))
2275     (setcdr data (cons (gnus-data-make number mark pos header level)
2276                        (cdr data)))
2277     (setq gnus-newsgroup-data-reverse nil)
2278     (gnus-data-update-list (cddr data) offset)))
2279
2280 (defun gnus-data-enter-list (after-article list &optional offset)
2281   (when list
2282     (let ((data (and after-article (gnus-data-find-list after-article)))
2283           (ilist list))
2284       (if (not (or data
2285                    after-article))
2286           (let ((odata gnus-newsgroup-data))
2287             (setq gnus-newsgroup-data (nconc list gnus-newsgroup-data))
2288             (when offset
2289               (gnus-data-update-list odata offset)))
2290         ;; Find the last element in the list to be spliced into the main
2291         ;; list.
2292         (while (cdr list)
2293           (setq list (cdr list)))
2294         (if (not data)
2295             (progn
2296               (setcdr list gnus-newsgroup-data)
2297               (setq gnus-newsgroup-data ilist)
2298               (when offset
2299                 (gnus-data-update-list (cdr list) offset)))
2300           (setcdr list (cdr data))
2301           (setcdr data ilist)
2302           (when offset
2303             (gnus-data-update-list (cdr list) offset))))
2304       (setq gnus-newsgroup-data-reverse nil))))
2305
2306 (defun gnus-data-remove (article &optional offset)
2307   (let ((data gnus-newsgroup-data))
2308     (if (= (gnus-data-number (car data)) article)
2309         (progn
2310           (setq gnus-newsgroup-data (cdr gnus-newsgroup-data)
2311                 gnus-newsgroup-data-reverse nil)
2312           (when offset
2313             (gnus-data-update-list gnus-newsgroup-data offset)))
2314       (while (cdr data)
2315         (when (= (gnus-data-number (cadr data)) article)
2316           (setcdr data (cddr data))
2317           (when offset
2318             (gnus-data-update-list (cdr data) offset))
2319           (setq data nil
2320                 gnus-newsgroup-data-reverse nil))
2321         (setq data (cdr data))))))
2322
2323 (defmacro gnus-data-list (backward)
2324   `(if ,backward
2325        (or gnus-newsgroup-data-reverse
2326            (setq gnus-newsgroup-data-reverse
2327                  (reverse gnus-newsgroup-data)))
2328      gnus-newsgroup-data))
2329
2330 (defun gnus-data-update-list (data offset)
2331   "Add OFFSET to the POS of all data entries in DATA."
2332   (setq gnus-newsgroup-data-reverse nil)
2333   (while data
2334     (setcar (nthcdr 2 (car data)) (+ offset (nth 2 (car data))))
2335     (setq data (cdr data))))
2336
2337 (defun gnus-summary-article-pseudo-p (article)
2338   "Say whether this article is a pseudo article or not."
2339   (not (vectorp (gnus-data-header (gnus-data-find article)))))
2340
2341 (defmacro gnus-summary-article-sparse-p (article)
2342   "Say whether this article is a sparse article or not."
2343   `(memq ,article gnus-newsgroup-sparse))
2344
2345 (defmacro gnus-summary-article-ancient-p (article)
2346   "Say whether this article is a sparse article or not."
2347   `(memq ,article gnus-newsgroup-ancient))
2348
2349 (defun gnus-article-parent-p (number)
2350   "Say whether this article is a parent or not."
2351   (let ((data (gnus-data-find-list number)))
2352     (and (cdr data)                     ; There has to be an article after...
2353          (< (gnus-data-level (car data)) ; And it has to have a higher level.
2354             (gnus-data-level (nth 1 data))))))
2355
2356 (defun gnus-article-children (number)
2357   "Return a list of all children to NUMBER."
2358   (let* ((data (gnus-data-find-list number))
2359          (level (gnus-data-level (car data)))
2360          children)
2361     (setq data (cdr data))
2362     (while (and data
2363                 (= (gnus-data-level (car data)) (1+ level)))
2364       (push (gnus-data-number (car data)) children)
2365       (setq data (cdr data)))
2366     children))
2367
2368 (defmacro gnus-summary-skip-intangible ()
2369   "If the current article is intangible, then jump to a different article."
2370   '(let ((to (get-text-property (point) 'gnus-intangible)))
2371      (and to (gnus-summary-goto-subject to))))
2372
2373 (defmacro gnus-summary-article-intangible-p ()
2374   "Say whether this article is intangible or not."
2375   '(get-text-property (point) 'gnus-intangible))
2376
2377 (defun gnus-article-read-p (article)
2378   "Say whether ARTICLE is read or not."
2379   (not (or (memq article gnus-newsgroup-marked)
2380            (memq article gnus-newsgroup-unreads)
2381            (memq article gnus-newsgroup-unselected)
2382            (memq article gnus-newsgroup-dormant))))
2383
2384 ;; Some summary mode macros.
2385
2386 (defmacro gnus-summary-article-number ()
2387   "The article number of the article on the current line.
2388 If there isn's an article number here, then we return the current
2389 article number."
2390   '(progn
2391      (gnus-summary-skip-intangible)
2392      (or (get-text-property (point) 'gnus-number)
2393          (gnus-summary-last-subject))))
2394
2395 (defmacro gnus-summary-article-header (&optional number)
2396   "Return the header of article NUMBER."
2397   `(gnus-data-header (gnus-data-find
2398                       ,(or number '(gnus-summary-article-number)))))
2399
2400 (defmacro gnus-summary-thread-level (&optional number)
2401   "Return the level of thread that starts with article NUMBER."
2402   `(if (and (eq gnus-summary-make-false-root 'dummy)
2403             (get-text-property (point) 'gnus-intangible))
2404        0
2405      (gnus-data-level (gnus-data-find
2406                        ,(or number '(gnus-summary-article-number))))))
2407
2408 (defmacro gnus-summary-article-mark (&optional number)
2409   "Return the mark of article NUMBER."
2410   `(gnus-data-mark (gnus-data-find
2411                     ,(or number '(gnus-summary-article-number)))))
2412
2413 (defmacro gnus-summary-article-pos (&optional number)
2414   "Return the position of the line of article NUMBER."
2415   `(gnus-data-pos (gnus-data-find
2416                    ,(or number '(gnus-summary-article-number)))))
2417
2418 (defalias 'gnus-summary-subject-string 'gnus-summary-article-subject)
2419 (defmacro gnus-summary-article-subject (&optional number)
2420   "Return current subject string or nil if nothing."
2421   `(let ((headers
2422           ,(if number
2423                `(gnus-data-header (assq ,number gnus-newsgroup-data))
2424              '(gnus-data-header (assq (gnus-summary-article-number)
2425                                       gnus-newsgroup-data)))))
2426      (and headers
2427           (vectorp headers)
2428           (mail-header-subject headers))))
2429
2430 (defmacro gnus-summary-article-score (&optional number)
2431   "Return current article score."
2432   `(or (cdr (assq ,(or number '(gnus-summary-article-number))
2433                   gnus-newsgroup-scored))
2434        gnus-summary-default-score 0))
2435
2436 (defun gnus-summary-article-children (&optional number)
2437   "Return a list of article numbers that are children of article NUMBER."
2438   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))))
2439          (level (gnus-data-level (car data)))
2440          l children)
2441     (while (and (setq data (cdr data))
2442                 (> (setq l (gnus-data-level (car data))) level))
2443       (and (= (1+ level) l)
2444            (push (gnus-data-number (car data))
2445                  children)))
2446     (nreverse children)))
2447
2448 (defun gnus-summary-article-parent (&optional number)
2449   "Return the article number of the parent of article NUMBER."
2450   (let* ((data (gnus-data-find-list (or number (gnus-summary-article-number))
2451                                     (gnus-data-list t)))
2452          (level (gnus-data-level (car data))))
2453     (if (zerop level)
2454         ()                              ; This is a root.
2455       ;; We search until we find an article with a level less than
2456       ;; this one.  That function has to be the parent.
2457       (while (and (setq data (cdr data))
2458                   (not (< (gnus-data-level (car data)) level))))
2459       (and data (gnus-data-number (car data))))))
2460
2461 (defun gnus-unread-mark-p (mark)
2462   "Say whether MARK is the unread mark."
2463   (= mark gnus-unread-mark))
2464
2465 (defun gnus-read-mark-p (mark)
2466   "Say whether MARK is one of the marks that mark as read.
2467 This is all marks except unread, ticked, dormant, and expirable."
2468   (not (or (= mark gnus-unread-mark)
2469            (= mark gnus-ticked-mark)
2470            (= mark gnus-dormant-mark)
2471            (= mark gnus-expirable-mark))))
2472
2473 (defmacro gnus-article-mark (number)
2474   "Return the MARK of article NUMBER.
2475 This macro should only be used when computing the mark the \"first\"
2476 time; i.e., when generating the summary lines.  After that,
2477 `gnus-summary-article-mark' should be used to examine the
2478 marks of articles."
2479   `(cond
2480     ((memq ,number gnus-newsgroup-unsendable) gnus-unsendable-mark)
2481     ((memq ,number gnus-newsgroup-undownloaded) gnus-undownloaded-mark)
2482     ((memq ,number gnus-newsgroup-downloadable) gnus-downloadable-mark)
2483     ((memq ,number gnus-newsgroup-unreads) gnus-unread-mark)
2484     ((memq ,number gnus-newsgroup-marked) gnus-ticked-mark)
2485     ((memq ,number gnus-newsgroup-dormant) gnus-dormant-mark)
2486     ((memq ,number gnus-newsgroup-expirable) gnus-expirable-mark)
2487     (t (or (cdr (assq ,number gnus-newsgroup-reads))
2488            gnus-ancient-mark))))
2489
2490 ;; Saving hidden threads.
2491
2492 (put 'gnus-save-hidden-threads 'lisp-indent-function 0)
2493 (put 'gnus-save-hidden-threads 'edebug-form-spec '(body))
2494
2495 (defmacro gnus-save-hidden-threads (&rest forms)
2496   "Save hidden threads, eval FORMS, and restore the hidden threads."
2497   (let ((config (make-symbol "config")))
2498     `(let ((,config (gnus-hidden-threads-configuration)))
2499        (unwind-protect
2500            (save-excursion
2501              ,@forms)
2502          (gnus-restore-hidden-threads-configuration ,config)))))
2503
2504 (defun gnus-data-compute-positions ()
2505   "Compute the positions of all articles."
2506   (setq gnus-newsgroup-data-reverse nil)
2507   (let ((data gnus-newsgroup-data))
2508     (save-excursion
2509       (gnus-save-hidden-threads
2510         (gnus-summary-show-all-threads)
2511         (goto-char (point-min))
2512         (while data
2513           (while (get-text-property (point) 'gnus-intangible)
2514             (forward-line 1))
2515           (gnus-data-set-pos (car data) (+ (point) 3))
2516           (setq data (cdr data))
2517           (forward-line 1))))))
2518
2519 (defun gnus-hidden-threads-configuration ()
2520   "Return the current hidden threads configuration."
2521   (save-excursion
2522     (let (config)
2523       (goto-char (point-min))
2524       (while (search-forward "\r" nil t)
2525         (push (1- (point)) config))
2526       config)))
2527
2528 (defun gnus-restore-hidden-threads-configuration (config)
2529   "Restore hidden threads configuration from CONFIG."
2530   (save-excursion
2531     (let (point buffer-read-only)
2532       (while (setq point (pop config))
2533         (when (and (< point (point-max))
2534                    (goto-char point)
2535                    (eq (char-after) ?\n))
2536           (subst-char-in-region point (1+ point) ?\n ?\r))))))
2537
2538 ;; Various summary mode internalish functions.
2539
2540 (defun gnus-mouse-pick-article (e)
2541   (interactive "e")
2542   (mouse-set-point e)
2543   (gnus-summary-next-page nil t))
2544
2545 (defun gnus-summary-set-display-table ()
2546   "Change the display table.
2547 Odd characters have a tendency to mess
2548 up nicely formatted displays - we make all possible glyphs
2549 display only a single character."
2550
2551   ;; We start from the standard display table, if any.
2552   (let ((table (or (copy-sequence standard-display-table)
2553                    (make-display-table)))
2554         (i 32))
2555     ;; Nix out all the control chars...
2556     (while (>= (setq i (1- i)) 0)
2557       (aset table i [??]))
2558     ;; ... but not newline and cr, of course.  (cr is necessary for the
2559     ;; selective display).
2560     (aset table ?\n nil)
2561     (aset table ?\r nil)
2562     ;; We keep TAB as well.
2563     (aset table ?\t nil)
2564     ;; We nix out any glyphs over 126 that are not set already.
2565     (let ((i 256))
2566       (while (>= (setq i (1- i)) 127)
2567         ;; Only modify if the entry is nil.
2568         (unless (aref table i)
2569           (aset table i [??]))))
2570     (setq buffer-display-table table)))
2571
2572 (defun gnus-summary-setup-buffer (group)
2573   "Initialize summary buffer."
2574   (let ((buffer (concat "*Summary " group "*")))
2575     (if (get-buffer buffer)
2576         (progn
2577           (set-buffer buffer)
2578           (setq gnus-summary-buffer (current-buffer))
2579           (not gnus-newsgroup-prepared))
2580       ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
2581       (setq gnus-summary-buffer (set-buffer (gnus-get-buffer-create buffer)))
2582       (gnus-summary-mode group)
2583       (when gnus-carpal
2584         (gnus-carpal-setup-buffer 'summary))
2585       (unless gnus-single-article-buffer
2586         (make-local-variable 'gnus-article-buffer)
2587         (make-local-variable 'gnus-article-current)
2588         (make-local-variable 'gnus-original-article-buffer))
2589       (setq gnus-newsgroup-name group)
2590       t)))
2591
2592 (defun gnus-set-global-variables ()
2593   "Set the global equivalents of the buffer-local variables.
2594 They are set to the latest values they had.  These reflect the summary
2595 buffer that was in action when the last article was fetched."
2596   (when (eq major-mode 'gnus-summary-mode)
2597     (setq gnus-summary-buffer (current-buffer))
2598     (let ((name gnus-newsgroup-name)
2599           (marked gnus-newsgroup-marked)
2600           (unread gnus-newsgroup-unreads)
2601           (headers gnus-current-headers)
2602           (data gnus-newsgroup-data)
2603           (summary gnus-summary-buffer)
2604           (article-buffer gnus-article-buffer)
2605           (original gnus-original-article-buffer)
2606           (gac gnus-article-current)
2607           (reffed gnus-reffed-article-number)
2608           (score-file gnus-current-score-file)
2609           (default-charset gnus-newsgroup-charset))
2610       (save-excursion
2611         (set-buffer gnus-group-buffer)
2612         (setq gnus-newsgroup-name name
2613               gnus-newsgroup-marked marked
2614               gnus-newsgroup-unreads unread
2615               gnus-current-headers headers
2616               gnus-newsgroup-data data
2617               gnus-article-current gac
2618               gnus-summary-buffer summary
2619               gnus-article-buffer article-buffer
2620               gnus-original-article-buffer original
2621               gnus-reffed-article-number reffed
2622               gnus-current-score-file score-file
2623               gnus-newsgroup-charset default-charset)
2624         ;; The article buffer also has local variables.
2625         (when (gnus-buffer-live-p gnus-article-buffer)
2626           (set-buffer gnus-article-buffer)
2627           (setq gnus-summary-buffer summary))))))
2628
2629 (defun gnus-summary-article-unread-p (article)
2630   "Say whether ARTICLE is unread or not."
2631   (memq article gnus-newsgroup-unreads))
2632
2633 (defun gnus-summary-first-article-p (&optional article)
2634   "Return whether ARTICLE is the first article in the buffer."
2635   (if (not (setq article (or article (gnus-summary-article-number))))
2636       nil
2637     (eq article (caar gnus-newsgroup-data))))
2638
2639 (defun gnus-summary-last-article-p (&optional article)
2640   "Return whether ARTICLE is the last article in the buffer."
2641   (if (not (setq article (or article (gnus-summary-article-number))))
2642       ;; All non-existent numbers are the last article.  :-)
2643       t
2644     (not (cdr (gnus-data-find-list article)))))
2645
2646 (defun gnus-make-thread-indent-array ()
2647   (let ((n 200))
2648     (unless (and gnus-thread-indent-array
2649                  (= gnus-thread-indent-level gnus-thread-indent-array-level))
2650       (setq gnus-thread-indent-array (make-vector 201 "")
2651             gnus-thread-indent-array-level gnus-thread-indent-level)
2652       (while (>= n 0)
2653         (aset gnus-thread-indent-array n
2654               (make-string (* n gnus-thread-indent-level) ? ))
2655         (setq n (1- n))))))
2656
2657 (defun gnus-update-summary-mark-positions ()
2658   "Compute where the summary marks are to go."
2659   (save-excursion
2660     (when (gnus-buffer-exists-p gnus-summary-buffer)
2661       (set-buffer gnus-summary-buffer))
2662     (let ((gnus-replied-mark 129)
2663           (gnus-score-below-mark 130)
2664           (gnus-score-over-mark 130)
2665           (gnus-download-mark 131)
2666           (spec gnus-summary-line-format-spec)
2667           gnus-visual pos)
2668       (save-excursion
2669         (gnus-set-work-buffer)
2670         (let ((gnus-summary-line-format-spec spec)
2671               (gnus-newsgroup-downloadable '((0 . t))))
2672           (gnus-summary-insert-line
2673            [0 "" "" "" "" "" 0 0 "" nil]  0 nil 128 t nil "" nil 1)
2674           (goto-char (point-min))
2675           (setq pos (list (cons 'unread (and (search-forward "\200" nil t)
2676                                              (- (point) (point-min) 1)))))
2677           (goto-char (point-min))
2678           (push (cons 'replied (and (search-forward "\201" nil t)
2679                                     (- (point) (point-min) 1)))
2680                 pos)
2681           (goto-char (point-min))
2682           (push (cons 'score (and (search-forward "\202" nil t)
2683                                   (- (point) (point-min) 1)))
2684                 pos)
2685           (goto-char (point-min))
2686           (push (cons 'download
2687                       (and (search-forward "\203" nil t)
2688                            (- (point) (point-min) 1)))
2689                 pos)))
2690       (setq gnus-summary-mark-positions pos))))
2691
2692 (defun gnus-summary-insert-dummy-line (gnus-tmp-subject gnus-tmp-number)
2693   "Insert a dummy root in the summary buffer."
2694   (beginning-of-line)
2695   (gnus-add-text-properties
2696    (point) (progn (eval gnus-summary-dummy-line-format-spec) (point))
2697    (list 'gnus-number gnus-tmp-number 'gnus-intangible gnus-tmp-number)))
2698
2699 (defun gnus-summary-from-or-to-or-newsgroups (header)
2700   (let ((to (cdr (assq 'To (mail-header-extra header))))
2701         (newsgroups (cdr (assq 'Newsgroups (mail-header-extra header))))
2702         (mail-parse-charset gnus-newsgroup-charset)
2703         (mail-parse-ignored-charsets
2704          (save-excursion (set-buffer gnus-summary-buffer)
2705                          gnus-newsgroup-ignored-charsets)))
2706     (cond
2707      ((and to
2708            gnus-ignored-from-addresses
2709            (string-match gnus-ignored-from-addresses
2710                          (mail-header-from header)))
2711       (concat "-> "
2712               (or (car (funcall gnus-extract-address-components
2713                                 (funcall
2714                                  gnus-decode-encoded-word-function to)))
2715                   (funcall gnus-decode-encoded-word-function to))))
2716      ((and newsgroups
2717            gnus-ignored-from-addresses
2718            (string-match gnus-ignored-from-addresses
2719                          (mail-header-from header)))
2720       (concat "=> " newsgroups))
2721      (t
2722       (or (car (funcall gnus-extract-address-components
2723                         (mail-header-from header)))
2724           (mail-header-from header))))))
2725
2726 (defun gnus-summary-insert-line (gnus-tmp-header
2727                                  gnus-tmp-level gnus-tmp-current
2728                                  gnus-tmp-unread gnus-tmp-replied
2729                                  gnus-tmp-expirable gnus-tmp-subject-or-nil
2730                                  &optional gnus-tmp-dummy gnus-tmp-score
2731                                  gnus-tmp-process)
2732   (let* ((gnus-tmp-indentation (aref gnus-thread-indent-array gnus-tmp-level))
2733          (gnus-tmp-lines (mail-header-lines gnus-tmp-header))
2734          (gnus-tmp-score (or gnus-tmp-score gnus-summary-default-score 0))
2735          (gnus-tmp-score-char
2736           (if (or (null gnus-summary-default-score)
2737                   (<= (abs (- gnus-tmp-score gnus-summary-default-score))
2738                       gnus-summary-zcore-fuzz))
2739               ?  ;Whitespace
2740             (if (< gnus-tmp-score gnus-summary-default-score)
2741                 gnus-score-below-mark gnus-score-over-mark)))
2742          (gnus-tmp-replied
2743           (cond (gnus-tmp-process gnus-process-mark)
2744                 ((memq gnus-tmp-current gnus-newsgroup-cached)
2745                  gnus-cached-mark)
2746                 (gnus-tmp-replied gnus-replied-mark)
2747                 ((memq gnus-tmp-current gnus-newsgroup-saved)
2748                  gnus-saved-mark)
2749                 (t gnus-unread-mark)))
2750          (gnus-tmp-from (mail-header-from gnus-tmp-header))
2751          (gnus-tmp-name
2752           (cond
2753            ((string-match "<[^>]+> *$" gnus-tmp-from)
2754             (let ((beg (match-beginning 0)))
2755               (or (and (string-match "^\"[^\"]*\"" gnus-tmp-from)
2756                        (substring gnus-tmp-from (1+ (match-beginning 0))
2757                                   (1- (match-end 0))))
2758                   (substring gnus-tmp-from 0 beg))))
2759            ((string-match "(.+)" gnus-tmp-from)
2760             (substring gnus-tmp-from
2761                        (1+ (match-beginning 0)) (1- (match-end 0))))
2762            (t gnus-tmp-from)))
2763          (gnus-tmp-subject (mail-header-subject gnus-tmp-header))
2764          (gnus-tmp-number (mail-header-number gnus-tmp-header))
2765          (gnus-tmp-opening-bracket (if gnus-tmp-dummy ?\< ?\[))
2766          (gnus-tmp-closing-bracket (if gnus-tmp-dummy ?\> ?\]))
2767          (buffer-read-only nil))
2768     (when (string= gnus-tmp-name "")
2769       (setq gnus-tmp-name gnus-tmp-from))
2770     (unless (numberp gnus-tmp-lines)
2771       (setq gnus-tmp-lines 0))
2772     (gnus-put-text-property
2773      (point)
2774      (progn (eval gnus-summary-line-format-spec) (point))
2775      'gnus-number gnus-tmp-number)
2776     (when (gnus-visual-p 'summary-highlight 'highlight)
2777       (forward-line -1)
2778       (gnus-run-hooks 'gnus-summary-update-hook)
2779       (forward-line 1))))
2780
2781 (defun gnus-summary-update-line (&optional dont-update)
2782   "Update summary line after change."
2783   (when (and gnus-summary-default-score
2784              (not gnus-summary-inhibit-highlight))
2785     (let* ((gnus-summary-inhibit-highlight t) ; Prevent recursion.
2786            (article (gnus-summary-article-number))
2787            (score (gnus-summary-article-score article)))
2788       (unless dont-update
2789         (if (and gnus-summary-mark-below
2790                  (< (gnus-summary-article-score)
2791                     gnus-summary-mark-below))
2792             ;; This article has a low score, so we mark it as read.
2793             (when (memq article gnus-newsgroup-unreads)
2794               (gnus-summary-mark-article-as-read gnus-low-score-mark))
2795           (when (eq (gnus-summary-article-mark) gnus-low-score-mark)
2796             ;; This article was previously marked as read on account
2797             ;; of a low score, but now it has risen, so we mark it as
2798             ;; unread.
2799             (gnus-summary-mark-article-as-unread gnus-unread-mark)))
2800         (gnus-summary-update-mark
2801          (if (or (null gnus-summary-default-score)
2802                  (<= (abs (- score gnus-summary-default-score))
2803                      gnus-summary-zcore-fuzz))
2804              ?  ;Whitespace
2805            (if (< score gnus-summary-default-score)
2806                gnus-score-below-mark gnus-score-over-mark))
2807          'score))
2808       ;; Do visual highlighting.
2809       (when (gnus-visual-p 'summary-highlight 'highlight)
2810         (gnus-run-hooks 'gnus-summary-update-hook)))))
2811
2812 (defvar gnus-tmp-new-adopts nil)
2813
2814 (defun gnus-summary-number-of-articles-in-thread (thread &optional level char)
2815   "Return the number of articles in THREAD.
2816 This may be 0 in some cases -- if none of the articles in
2817 the thread are to be displayed."
2818   (let* ((number
2819           ;; Fix by Luc Van Eycken <Luc.VanEycken@esat.kuleuven.ac.be>.
2820           (cond
2821            ((not (listp thread))
2822             1)
2823            ((and (consp thread) (cdr thread))
2824             (apply
2825              '+ 1 (mapcar
2826                    'gnus-summary-number-of-articles-in-thread (cdr thread))))
2827            ((null thread)
2828             1)
2829            ((memq (mail-header-number (car thread)) gnus-newsgroup-limit)
2830             1)
2831            (t 0))))
2832     (when (and level (zerop level) gnus-tmp-new-adopts)
2833       (incf number
2834             (apply '+ (mapcar
2835                        'gnus-summary-number-of-articles-in-thread
2836                        gnus-tmp-new-adopts))))
2837     (if char
2838         (if (> number 1) gnus-not-empty-thread-mark
2839           gnus-empty-thread-mark)
2840       number)))
2841
2842 (defun gnus-summary-set-local-parameters (group)
2843   "Go through the local params of GROUP and set all variable specs in that list."
2844   (let ((params (gnus-group-find-parameter group))
2845         elem)
2846     (while params
2847       (setq elem (car params)
2848             params (cdr params))
2849       (and (consp elem)                 ; Has to be a cons.
2850            (consp (cdr elem))           ; The cdr has to be a list.
2851            (symbolp (car elem))         ; Has to be a symbol in there.
2852            (not (memq (car elem) '(quit-config))) ; Ignore quit-config.
2853            (ignore-errors               ; So we set it.
2854              (make-local-variable (car elem))
2855              (set (car elem) (eval (nth 1 elem))))))))
2856
2857 (defun gnus-summary-read-group (group &optional show-all no-article
2858                                       kill-buffer no-display backward
2859                                       select-articles)
2860   "Start reading news in newsgroup GROUP.
2861 If SHOW-ALL is non-nil, already read articles are also listed.
2862 If NO-ARTICLE is non-nil, no article is selected initially.
2863 If NO-DISPLAY, don't generate a summary buffer."
2864   (let (result)
2865     (while (and group
2866                 (null (setq result
2867                             (let ((gnus-auto-select-next nil))
2868                               (or (gnus-summary-read-group-1
2869                                    group show-all no-article
2870                                    kill-buffer no-display
2871                                    select-articles)
2872                                   (setq show-all nil
2873                                         select-articles nil)))))
2874                 (eq gnus-auto-select-next 'quietly))
2875       (set-buffer gnus-group-buffer)
2876       ;; The entry function called above goes to the next
2877       ;; group automatically, so we go two groups back
2878       ;; if we are searching for the previous group.
2879       (when backward
2880         (gnus-group-prev-unread-group 2))
2881       (if (not (equal group (gnus-group-group-name)))
2882           (setq group (gnus-group-group-name))
2883         (setq group nil)))
2884     result))
2885
2886 (defun gnus-summary-read-group-1 (group show-all no-article
2887                                         kill-buffer no-display
2888                                         &optional select-articles)
2889   ;; Killed foreign groups can't be entered.
2890   (when (and (not (gnus-group-native-p group))
2891              (not (gnus-gethash group gnus-newsrc-hashtb)))
2892     (error "Dead non-native groups can't be entered"))
2893   (gnus-message 5 "Retrieving newsgroup: %s..." group)
2894   (let* ((new-group (gnus-summary-setup-buffer group))
2895          (quit-config (gnus-group-quit-config group))
2896          (did-select (and new-group (gnus-select-newsgroup
2897                                      group show-all select-articles))))
2898     (cond
2899      ;; This summary buffer exists already, so we just select it.
2900      ((not new-group)
2901       (gnus-set-global-variables)
2902       (when kill-buffer
2903         (gnus-kill-or-deaden-summary kill-buffer))
2904       (gnus-configure-windows 'summary 'force)
2905       (gnus-set-mode-line 'summary)
2906       (gnus-summary-position-point)
2907       (message "")
2908       t)
2909      ;; We couldn't select this group.
2910      ((null did-select)
2911       (when (and (eq major-mode 'gnus-summary-mode)
2912                  (not (equal (current-buffer) kill-buffer)))
2913         (kill-buffer (current-buffer))
2914         (if (not quit-config)
2915             (progn
2916               ;; Update the info -- marks might need to be removed,
2917               ;; for instance.
2918               (gnus-summary-update-info)
2919               (set-buffer gnus-group-buffer)
2920               (gnus-group-jump-to-group group)
2921               (gnus-group-next-unread-group 1))
2922           (gnus-handle-ephemeral-exit quit-config)))
2923       (gnus-message 3 "Can't select group")
2924       nil)
2925      ;; The user did a `C-g' while prompting for number of articles,
2926      ;; so we exit this group.
2927      ((eq did-select 'quit)
2928       (and (eq major-mode 'gnus-summary-mode)
2929            (not (equal (current-buffer) kill-buffer))
2930            (kill-buffer (current-buffer)))
2931       (when kill-buffer
2932         (gnus-kill-or-deaden-summary kill-buffer))
2933       (if (not quit-config)
2934           (progn
2935             (set-buffer gnus-group-buffer)
2936             (gnus-group-jump-to-group group)
2937             (gnus-group-next-unread-group 1)
2938             (gnus-configure-windows 'group 'force))
2939         (gnus-handle-ephemeral-exit quit-config))
2940       ;; Finally signal the quit.
2941       (signal 'quit nil))
2942      ;; The group was successfully selected.
2943      (t
2944       (gnus-set-global-variables)
2945       ;; Save the active value in effect when the group was entered.
2946       (setq gnus-newsgroup-active
2947             (gnus-copy-sequence
2948              (gnus-active gnus-newsgroup-name)))
2949       ;; You can change the summary buffer in some way with this hook.
2950       (gnus-run-hooks 'gnus-select-group-hook)
2951       ;; Set any local variables in the group parameters.
2952       (gnus-summary-set-local-parameters gnus-newsgroup-name)
2953       (gnus-update-format-specifications
2954        nil 'summary 'summary-mode 'summary-dummy)
2955       (gnus-update-summary-mark-positions)
2956       ;; Do score processing.
2957       (when gnus-use-scoring
2958         (gnus-possibly-score-headers))
2959       ;; Check whether to fill in the gaps in the threads.
2960       (when gnus-build-sparse-threads
2961         (gnus-build-sparse-threads))
2962       ;; Find the initial limit.
2963       (if gnus-show-threads
2964           (if show-all
2965               (let ((gnus-newsgroup-dormant nil))
2966                 (gnus-summary-initial-limit show-all))
2967             (gnus-summary-initial-limit show-all))
2968         ;; When untreaded, all articles are always shown.
2969         (setq gnus-newsgroup-limit
2970               (mapcar
2971                (lambda (header) (mail-header-number header))
2972                gnus-newsgroup-headers)))
2973       ;; Generate the summary buffer.
2974       (unless no-display
2975         (gnus-summary-prepare))
2976       (when gnus-use-trees
2977         (gnus-tree-open group)
2978         (setq gnus-summary-highlight-line-function
2979               'gnus-tree-highlight-article))
2980       ;; If the summary buffer is empty, but there are some low-scored
2981       ;; articles or some excluded dormants, we include these in the
2982       ;; buffer.
2983       (when (and (zerop (buffer-size))
2984                  (not no-display))
2985         (cond (gnus-newsgroup-dormant
2986                (gnus-summary-limit-include-dormant))
2987               ((and gnus-newsgroup-scored show-all)
2988                (gnus-summary-limit-include-expunged t))))
2989       ;; Function `gnus-apply-kill-file' must be called in this hook.
2990       (gnus-run-hooks 'gnus-apply-kill-hook)
2991       (if (and (zerop (buffer-size))
2992                (not no-display))
2993           (progn
2994             ;; This newsgroup is empty.
2995             (gnus-summary-catchup-and-exit nil t)
2996             (gnus-message 6 "No unread news")
2997             (when kill-buffer
2998               (gnus-kill-or-deaden-summary kill-buffer))
2999             ;; Return nil from this function.
3000             nil)
3001         ;; Hide conversation thread subtrees.  We cannot do this in
3002         ;; gnus-summary-prepare-hook since kill processing may not
3003         ;; work with hidden articles.
3004         (and gnus-show-threads
3005              gnus-thread-hide-subtree
3006              (gnus-summary-hide-all-threads))
3007         (when kill-buffer
3008           (gnus-kill-or-deaden-summary kill-buffer))
3009         ;; Show first unread article if requested.
3010         (if (and (not no-article)
3011                  (not no-display)
3012                  gnus-newsgroup-unreads
3013                  gnus-auto-select-first)
3014             (progn
3015               (gnus-configure-windows 'summary)
3016               (cond
3017                ((eq gnus-auto-select-first 'best)
3018                 (gnus-summary-best-unread-article))
3019                ((eq gnus-auto-select-first t)
3020                 (gnus-summary-first-unread-article))
3021                ((gnus-functionp gnus-auto-select-first)
3022                 (funcall gnus-auto-select-first))))
3023           ;; Don't select any articles, just move point to the first
3024           ;; article in the group.
3025           (goto-char (point-min))
3026           (gnus-summary-position-point)
3027           (gnus-configure-windows 'summary 'force)
3028           (gnus-set-mode-line 'summary))
3029         (when (get-buffer-window gnus-group-buffer t)
3030           ;; Gotta use windows, because recenter does weird stuff if
3031           ;; the current buffer ain't the displayed window.
3032           (let ((owin (selected-window)))
3033             (select-window (get-buffer-window gnus-group-buffer t))
3034             (when (gnus-group-goto-group group)
3035               (recenter))
3036             (select-window owin)))
3037         ;; Mark this buffer as "prepared".
3038         (setq gnus-newsgroup-prepared t)
3039         (gnus-run-hooks 'gnus-summary-prepared-hook)
3040         t)))))
3041
3042 (defun gnus-summary-prepare ()
3043   "Generate the summary buffer."
3044   (interactive)
3045   (let ((buffer-read-only nil))
3046     (erase-buffer)
3047     (setq gnus-newsgroup-data nil
3048           gnus-newsgroup-data-reverse nil)
3049     (gnus-run-hooks 'gnus-summary-generate-hook)
3050     ;; Generate the buffer, either with threads or without.
3051     (when gnus-newsgroup-headers
3052       (gnus-summary-prepare-threads
3053        (if gnus-show-threads
3054            (gnus-sort-gathered-threads
3055             (funcall gnus-summary-thread-gathering-function
3056                      (gnus-sort-threads
3057                       (gnus-cut-threads (gnus-make-threads)))))
3058          ;; Unthreaded display.
3059          (gnus-sort-articles gnus-newsgroup-headers))))
3060     (setq gnus-newsgroup-data (nreverse gnus-newsgroup-data))
3061     ;; Call hooks for modifying summary buffer.
3062     (goto-char (point-min))
3063     (gnus-run-hooks 'gnus-summary-prepare-hook)))
3064
3065 (defsubst gnus-general-simplify-subject (subject)
3066   "Simply subject by the same rules as gnus-gather-threads-by-subject."
3067   (setq subject
3068         (cond
3069          ;; Truncate the subject.
3070          (gnus-simplify-subject-functions
3071           (gnus-map-function gnus-simplify-subject-functions subject))
3072          ((numberp gnus-summary-gather-subject-limit)
3073           (setq subject (gnus-simplify-subject-re subject))
3074           (if (> (length subject) gnus-summary-gather-subject-limit)
3075               (substring subject 0 gnus-summary-gather-subject-limit)
3076             subject))
3077          ;; Fuzzily simplify it.
3078          ((eq 'fuzzy gnus-summary-gather-subject-limit)
3079           (gnus-simplify-subject-fuzzy subject))
3080          ;; Just remove the leading "Re:".
3081          (t
3082           (gnus-simplify-subject-re subject))))
3083
3084   (if (and gnus-summary-gather-exclude-subject
3085            (string-match gnus-summary-gather-exclude-subject subject))
3086       nil                               ; This article shouldn't be gathered
3087     subject))
3088
3089 (defun gnus-summary-simplify-subject-query ()
3090   "Query where the respool algorithm would put this article."
3091   (interactive)
3092   (gnus-summary-select-article)
3093   (message (gnus-general-simplify-subject (gnus-summary-article-subject))))
3094
3095 (defun gnus-gather-threads-by-subject (threads)
3096   "Gather threads by looking at Subject headers."
3097   (if (not gnus-summary-make-false-root)
3098       threads
3099     (let ((hashtb (gnus-make-hashtable 1024))
3100           (prev threads)
3101           (result threads)
3102           subject hthread whole-subject)
3103       (while threads
3104         (setq subject (gnus-general-simplify-subject
3105                        (setq whole-subject (mail-header-subject
3106                                             (caar threads)))))
3107         (when subject
3108           (if (setq hthread (gnus-gethash subject hashtb))
3109               (progn
3110                 ;; We enter a dummy root into the thread, if we
3111                 ;; haven't done that already.
3112                 (unless (stringp (caar hthread))
3113                   (setcar hthread (list whole-subject (car hthread))))
3114                 ;; We add this new gathered thread to this gathered
3115                 ;; thread.
3116                 (setcdr (car hthread)
3117                         (nconc (cdar hthread) (list (car threads))))
3118                 ;; Remove it from the list of threads.
3119                 (setcdr prev (cdr threads))
3120                 (setq threads prev))
3121             ;; Enter this thread into the hash table.
3122             (gnus-sethash subject threads hashtb)))
3123         (setq prev threads)
3124         (setq threads (cdr threads)))
3125       result)))
3126
3127 (defun gnus-gather-threads-by-references (threads)
3128   "Gather threads by looking at References headers."
3129   (let ((idhashtb (gnus-make-hashtable 1024))
3130         (thhashtb (gnus-make-hashtable 1024))
3131         (prev threads)
3132         (result threads)
3133         ids references id gthread gid entered ref)
3134     (while threads
3135       (when (setq references (mail-header-references (caar threads)))
3136         (setq id (mail-header-id (caar threads))
3137               ids (gnus-split-references references)
3138               entered nil)
3139         (while (setq ref (pop ids))
3140           (setq ids (delete ref ids))
3141           (if (not (setq gid (gnus-gethash ref idhashtb)))
3142               (progn
3143                 (gnus-sethash ref id idhashtb)
3144                 (gnus-sethash id threads thhashtb))
3145             (setq gthread (gnus-gethash gid thhashtb))
3146             (unless entered
3147               ;; We enter a dummy root into the thread, if we
3148               ;; haven't done that already.
3149               (unless (stringp (caar gthread))
3150                 (setcar gthread (list (mail-header-subject (caar gthread))
3151                                       (car gthread))))
3152               ;; We add this new gathered thread to this gathered
3153               ;; thread.
3154               (setcdr (car gthread)
3155                       (nconc (cdar gthread) (list (car threads)))))
3156             ;; Add it into the thread hash table.
3157             (gnus-sethash id gthread thhashtb)
3158             (setq entered t)
3159             ;; Remove it from the list of threads.
3160             (setcdr prev (cdr threads))
3161             (setq threads prev))))
3162       (setq prev threads)
3163       (setq threads (cdr threads)))
3164     result))
3165
3166 (defun gnus-sort-gathered-threads (threads)
3167   "Sort subtreads inside each gathered thread by `gnus-sort-gathered-threads-function'."
3168   (let ((result threads))
3169     (while threads
3170       (when (stringp (caar threads))
3171         (setcdr (car threads)
3172                 (sort (cdar threads) gnus-sort-gathered-threads-function)))
3173       (setq threads (cdr threads)))
3174     result))
3175
3176 (defun gnus-thread-loop-p (root thread)
3177   "Say whether ROOT is in THREAD."
3178   (let ((stack (list thread))
3179         (infloop 0)
3180         th)
3181     (while (setq thread (pop stack))
3182       (setq th (cdr thread))
3183       (while (and th
3184                   (not (eq (caar th) root)))
3185         (pop th))
3186       (if th
3187           ;; We have found a loop.
3188           (let (ref-dep)
3189             (setcdr thread (delq (car th) (cdr thread)))
3190             (if (boundp (setq ref-dep (intern "none"
3191                                               gnus-newsgroup-dependencies)))
3192                 (setcdr (symbol-value ref-dep)
3193                         (nconc (cdr (symbol-value ref-dep))
3194                                (list (car th))))
3195               (set ref-dep (list nil (car th))))
3196             (setq infloop 1
3197                   stack nil))
3198         ;; Push all the subthreads onto the stack.
3199         (push (cdr thread) stack)))
3200     infloop))
3201
3202 (defun gnus-make-threads ()
3203   "Go through the dependency hashtb and find the roots.  Return all threads."
3204   (let (threads)
3205     (while (catch 'infloop
3206              (mapatoms
3207               (lambda (refs)
3208                 ;; Deal with self-referencing References loops.
3209                 (when (and (car (symbol-value refs))
3210                            (not (zerop
3211                                  (apply
3212                                   '+
3213                                   (mapcar
3214                                    (lambda (thread)
3215                                      (gnus-thread-loop-p
3216                                       (car (symbol-value refs)) thread))
3217                                    (cdr (symbol-value refs)))))))
3218                   (setq threads nil)
3219                   (throw 'infloop t))
3220                 (unless (car (symbol-value refs))
3221                   ;; These threads do not refer back to any other articles,
3222                   ;; so they're roots.
3223                   (setq threads (append (cdr (symbol-value refs)) threads))))
3224               gnus-newsgroup-dependencies)))
3225     threads))
3226
3227 ;; Build the thread tree.
3228 (defsubst gnus-dependencies-add-header (header dependencies force-new)
3229   "Enter HEADER into the DEPENDENCIES table if it is not already there.
3230
3231 If FORCE-NEW is not nil, enter HEADER into the DEPENDENCIES table even
3232 if it was already present.
3233
3234 If `gnus-summary-ignore-duplicates' is nil then duplicate Message-IDs
3235 will not be entered in the DEPENDENCIES table.  Otherwise duplicate
3236 Message-IDs will be renamed be renamed to a unique Message-ID before
3237 being entered.
3238
3239 Returns HEADER if it was entered in the DEPENDENCIES.  Returns nil otherwise."
3240   (let* ((id (mail-header-id header))
3241          (id-dep (and id (intern id dependencies)))
3242          ref ref-dep ref-header)
3243     ;; Enter this `header' in the `dependencies' table.
3244     (cond
3245      ((not id-dep)
3246       (setq header nil))
3247      ;; The first two cases do the normal part: enter a new `header'
3248      ;; in the `dependencies' table.
3249      ((not (boundp id-dep))
3250       (set id-dep (list header)))
3251      ((null (car (symbol-value id-dep)))
3252       (setcar (symbol-value id-dep) header))
3253
3254      ;; From here the `header' was already present in the
3255      ;; `dependencies' table.
3256      (force-new
3257       ;; Overrides an existing entry;
3258       ;; just set the header part of the entry.
3259       (setcar (symbol-value id-dep) header))
3260
3261      ;; Renames the existing `header' to a unique Message-ID.
3262      ((not gnus-summary-ignore-duplicates)
3263       ;; An article with this Message-ID has already been seen.
3264       ;; We rename the Message-ID.
3265       (set (setq id-dep (intern (setq id (nnmail-message-id)) dependencies))
3266            (list header))
3267       (mail-header-set-id header id))
3268
3269      ;; The last case ignores an existing entry, except it adds any
3270      ;; additional Xrefs (in case the two articles came from different
3271      ;; servers.
3272      ;; Also sets `header' to `nil' meaning that the `dependencies'
3273      ;; table was *not* modified.
3274      (t
3275       (mail-header-set-xref
3276        (car (symbol-value id-dep))
3277        (concat (or (mail-header-xref (car (symbol-value id-dep)))
3278                    "")
3279                (or (mail-header-xref header) "")))
3280       (setq header nil)))
3281
3282     (when header
3283       ;; First check if that we are not creating a References loop.
3284       (setq ref (gnus-parent-id (mail-header-references header)))
3285       (while (and ref
3286                   (setq ref-dep (intern-soft ref dependencies))
3287                   (boundp ref-dep)
3288                   (setq ref-header (car (symbol-value ref-dep))))
3289         (if (string= id ref)
3290             ;; Yuk!  This is a reference loop.  Make the article be a
3291             ;; root article.
3292             (progn
3293               (mail-header-set-references (car (symbol-value id-dep)) "none")
3294               (setq ref nil))
3295           (setq ref (gnus-parent-id (mail-header-references ref-header)))))
3296       (setq ref (gnus-parent-id (mail-header-references header)))
3297       (setq ref-dep (intern (or ref "none") dependencies))
3298       (if (boundp ref-dep)
3299           (setcdr (symbol-value ref-dep)
3300                   (nconc (cdr (symbol-value ref-dep))
3301                          (list (symbol-value id-dep))))
3302         (set ref-dep (list nil (symbol-value id-dep)))))
3303     header))
3304
3305 (defun gnus-build-sparse-threads ()
3306   (let ((headers gnus-newsgroup-headers)
3307         (mail-parse-charset gnus-newsgroup-charset)
3308         (gnus-summary-ignore-duplicates t)
3309         header references generation relations
3310         subject child end new-child date)
3311     ;; First we create an alist of generations/relations, where
3312     ;; generations is how much we trust the relation, and the relation
3313     ;; is parent/child.
3314     (gnus-message 7 "Making sparse threads...")
3315     (save-excursion
3316       (nnheader-set-temp-buffer " *gnus sparse threads*")
3317       (while (setq header (pop headers))
3318         (when (and (setq references (mail-header-references header))
3319                    (not (string= references "")))
3320           (insert references)
3321           (setq child (mail-header-id header)
3322                 subject (mail-header-subject header)
3323                 date (mail-header-date header)
3324                 generation 0)
3325           (while (search-backward ">" nil t)
3326             (setq end (1+ (point)))
3327             (when (search-backward "<" nil t)
3328               (setq new-child (buffer-substring (point) end))
3329               (push (list (incf generation)
3330                           child (setq child new-child)
3331                           subject date)
3332                     relations)))
3333           (when child
3334             (push (list (1+ generation) child nil subject) relations))
3335           (erase-buffer)))
3336       (kill-buffer (current-buffer)))
3337     ;; Sort over trustworthiness.
3338     (mapcar
3339      (lambda (relation)
3340        (when (gnus-dependencies-add-header
3341               (make-full-mail-header
3342                gnus-reffed-article-number
3343                (nth 3 relation) "" (or (nth 4 relation) "")
3344                (nth 1 relation)
3345                (or (nth 2 relation) "") 0 0 "")
3346               gnus-newsgroup-dependencies nil)
3347          (push gnus-reffed-article-number gnus-newsgroup-limit)
3348          (push gnus-reffed-article-number gnus-newsgroup-sparse)
3349          (push (cons gnus-reffed-article-number gnus-sparse-mark)
3350                gnus-newsgroup-reads)
3351          (decf gnus-reffed-article-number)))
3352      (sort relations 'car-less-than-car))
3353     (gnus-message 7 "Making sparse threads...done")))
3354
3355 (defun gnus-build-old-threads ()
3356   ;; Look at all the articles that refer back to old articles, and
3357   ;; fetch the headers for the articles that aren't there.  This will
3358   ;; build complete threads - if the roots haven't been expired by the
3359   ;; server, that is.
3360   (let ((mail-parse-charset gnus-newsgroup-charset)
3361         id heads)
3362     (mapatoms
3363      (lambda (refs)
3364        (when (not (car (symbol-value refs)))
3365          (setq heads (cdr (symbol-value refs)))
3366          (while heads
3367            (if (memq (mail-header-number (caar heads))
3368                      gnus-newsgroup-dormant)
3369                (setq heads (cdr heads))
3370              (setq id (symbol-name refs))
3371              (while (and (setq id (gnus-build-get-header id))
3372                          (not (car (gnus-id-to-thread id)))))
3373              (setq heads nil)))))
3374      gnus-newsgroup-dependencies)))
3375
3376 ;; This function has to be called with point after the article number
3377 ;; on the beginning of the line.
3378 (defsubst gnus-nov-parse-line (number dependencies &optional force-new)
3379   (let ((eol (gnus-point-at-eol))
3380         (buffer (current-buffer))
3381         header)
3382
3383     ;; overview: [num subject from date id refs chars lines misc]
3384     (unwind-protect
3385         (progn
3386           (narrow-to-region (point) eol)
3387           (unless (eobp)
3388             (forward-char))
3389
3390           (setq header
3391                 (make-full-mail-header
3392                  number                 ; number
3393                  (funcall gnus-decode-encoded-word-function
3394                           (nnheader-nov-field)) ; subject
3395                  (funcall gnus-decode-encoded-word-function
3396                           (nnheader-nov-field)) ; from
3397                  (nnheader-nov-field)   ; date
3398                  (nnheader-nov-read-message-id) ; id
3399                  (nnheader-nov-field)   ; refs
3400                  (nnheader-nov-read-integer) ; chars
3401                  (nnheader-nov-read-integer) ; lines
3402                  (unless (eobp)
3403                    (if (looking-at "Xref: ")
3404                        (goto-char (match-end 0)))
3405                    (nnheader-nov-field)) ; Xref
3406                  (nnheader-nov-parse-extra)))) ; extra
3407
3408       (widen))
3409
3410     (when gnus-alter-header-function
3411       (funcall gnus-alter-header-function header))
3412     (gnus-dependencies-add-header header dependencies force-new)))
3413
3414 (defun gnus-build-get-header (id)
3415   "Look through the buffer of NOV lines and find the header to ID.
3416 Enter this line into the dependencies hash table, and return
3417 the id of the parent article (if any)."
3418   (let ((deps gnus-newsgroup-dependencies)
3419         found header)
3420     (prog1
3421         (save-excursion
3422           (set-buffer nntp-server-buffer)
3423           (let ((case-fold-search nil))
3424             (goto-char (point-min))
3425             (while (and (not found)
3426                         (search-forward id nil t))
3427               (beginning-of-line)
3428               (setq found (looking-at
3429                            (format "^[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t%s"
3430                                    (regexp-quote id))))
3431               (or found (beginning-of-line 2)))
3432             (when found
3433               (beginning-of-line)
3434               (and
3435                (setq header (gnus-nov-parse-line
3436                              (read (current-buffer)) deps))
3437                (gnus-parent-id (mail-header-references header))))))
3438       (when header
3439         (let ((number (mail-header-number header)))
3440           (push number gnus-newsgroup-limit)
3441           (push header gnus-newsgroup-headers)
3442           (if (memq number gnus-newsgroup-unselected)
3443               (progn
3444                 (push number gnus-newsgroup-unreads)
3445                 (setq gnus-newsgroup-unselected
3446                       (delq number gnus-newsgroup-unselected)))
3447             (push number gnus-newsgroup-ancient)))))))
3448
3449 (defun gnus-build-all-threads ()
3450   "Read all the headers."
3451   (let ((gnus-summary-ignore-duplicates t)
3452         (mail-parse-charset gnus-newsgroup-charset)
3453         (dependencies gnus-newsgroup-dependencies)
3454         header article)
3455     (save-excursion
3456       (set-buffer nntp-server-buffer)
3457       (let ((case-fold-search nil))
3458         (goto-char (point-min))
3459         (while (not (eobp))
3460           (ignore-errors
3461             (setq article (read (current-buffer))
3462                   header (gnus-nov-parse-line article dependencies)))
3463           (when header
3464             (save-excursion
3465               (set-buffer gnus-summary-buffer)
3466               (push header gnus-newsgroup-headers)
3467               (if (memq (setq article (mail-header-number header))
3468                         gnus-newsgroup-unselected)
3469                   (progn
3470                     (push article gnus-newsgroup-unreads)
3471                     (setq gnus-newsgroup-unselected
3472                           (delq article gnus-newsgroup-unselected)))
3473                 (push article gnus-newsgroup-ancient)))
3474             (forward-line 1)))))))
3475
3476 (defun gnus-summary-update-article-line (article header)
3477   "Update the line for ARTICLE using HEADERS."
3478   (let* ((id (mail-header-id header))
3479          (thread (gnus-id-to-thread id)))
3480     (unless thread
3481       (error "Article in no thread"))
3482     ;; Update the thread.
3483     (setcar thread header)
3484     (gnus-summary-goto-subject article)
3485     (let* ((datal (gnus-data-find-list article))
3486            (data (car datal))
3487            (length (when (cdr datal)
3488                      (- (gnus-data-pos data)
3489                         (gnus-data-pos (cadr datal)))))
3490            (buffer-read-only nil)
3491            (level (gnus-summary-thread-level)))
3492       (gnus-delete-line)
3493       (gnus-summary-insert-line
3494        header level nil (gnus-article-mark article)
3495        (memq article gnus-newsgroup-replied)
3496        (memq article gnus-newsgroup-expirable)
3497        ;; Only insert the Subject string when it's different
3498        ;; from the previous Subject string.
3499        (if (and
3500             gnus-show-threads
3501             (gnus-subject-equal
3502              (condition-case ()
3503                  (mail-header-subject
3504                   (gnus-data-header
3505                    (cadr
3506                     (gnus-data-find-list
3507                      article
3508                      (gnus-data-list t)))))
3509                ;; Error on the side of excessive subjects.
3510                (error ""))
3511              (mail-header-subject header)))
3512            ""
3513          (mail-header-subject header))
3514        nil (cdr (assq article gnus-newsgroup-scored))
3515        (memq article gnus-newsgroup-processable))
3516       (when length
3517         (gnus-data-update-list
3518          (cdr datal) (- length (- (gnus-data-pos data) (point))))))))
3519
3520 (defun gnus-summary-update-article (article &optional iheader)
3521   "Update ARTICLE in the summary buffer."
3522   (set-buffer gnus-summary-buffer)
3523   (let* ((header (gnus-summary-article-header article))
3524          (id (mail-header-id header))
3525          (data (gnus-data-find article))
3526          (thread (gnus-id-to-thread id))
3527          (references (mail-header-references header))
3528          (parent
3529           (gnus-id-to-thread
3530            (or (gnus-parent-id
3531                 (when (and references
3532                            (not (equal "" references)))
3533                   references))
3534                "none")))
3535          (buffer-read-only nil)
3536          (old (car thread)))
3537     (when thread
3538       (unless iheader
3539         (setcar thread nil)
3540         (when parent
3541           (delq thread parent)))
3542       (if (gnus-summary-insert-subject id header)
3543           ;; Set the (possibly) new article number in the data structure.
3544           (gnus-data-set-number data (gnus-id-to-article id))
3545         (setcar thread old)
3546         nil))))
3547
3548 (defun gnus-rebuild-thread (id &optional line)
3549   "Rebuild the thread containing ID.
3550 If LINE, insert the rebuilt thread starting on line LINE."
3551   (let ((buffer-read-only nil)
3552         old-pos current thread data)
3553     (if (not gnus-show-threads)
3554         (setq thread (list (car (gnus-id-to-thread id))))
3555       ;; Get the thread this article is part of.
3556       (setq thread (gnus-remove-thread id)))
3557     (setq old-pos (gnus-point-at-bol))
3558     (setq current (save-excursion
3559                     (and (re-search-backward "[\r\n]" nil t)
3560                          (gnus-summary-article-number))))
3561     ;; If this is a gathered thread, we have to go some re-gathering.
3562     (when (stringp (car thread))
3563       (let ((subject (car thread))
3564             roots thr)
3565         (setq thread (cdr thread))
3566         (while thread
3567           (unless (memq (setq thr (gnus-id-to-thread
3568                                    (gnus-root-id
3569                                     (mail-header-id (caar thread)))))
3570                         roots)
3571             (push thr roots))
3572           (setq thread (cdr thread)))
3573         ;; We now have all (unique) roots.
3574         (if (= (length roots) 1)
3575             ;; All the loose roots are now one solid root.
3576             (setq thread (car roots))
3577           (setq thread (cons subject (gnus-sort-threads roots))))))
3578     (let (threads)
3579       ;; We then insert this thread into the summary buffer.
3580       (when line
3581         (goto-char (point-min))
3582         (forward-line (1- line)))
3583       (let (gnus-newsgroup-data gnus-newsgroup-threads)
3584         (if gnus-show-threads
3585             (gnus-summary-prepare-threads (gnus-cut-threads (list thread)))
3586           (gnus-summary-prepare-unthreaded thread))
3587         (setq data (nreverse gnus-newsgroup-data))
3588         (setq threads gnus-newsgroup-threads))
3589       ;; We splice the new data into the data structure.
3590       ;;!!! This is kinda bogus.  We assume that in LINE is non-nil,
3591       ;;!!! then we want to insert at the beginning of the buffer.
3592       ;;!!! That happens to be true with Gnus now, but that may
3593       ;;!!! change in the future.  Perhaps.
3594       (gnus-data-enter-list
3595        (if line nil current) data (- (point) old-pos))
3596       (setq gnus-newsgroup-threads
3597             (nconc threads gnus-newsgroup-threads))
3598       (gnus-data-compute-positions))))
3599
3600 (defun gnus-number-to-header (number)
3601   "Return the header for article NUMBER."
3602   (let ((headers gnus-newsgroup-headers))
3603     (while (and headers
3604                 (not (= number (mail-header-number (car headers)))))
3605       (pop headers))
3606     (when headers
3607       (car headers))))
3608
3609 (defun gnus-parent-headers (in-headers &optional generation)
3610   "Return the headers of the GENERATIONeth parent of HEADERS."
3611   (unless generation
3612     (setq generation 1))
3613   (let ((parent t)
3614         (headers in-headers)
3615         references)
3616     (while (and parent
3617                 (not (zerop generation))
3618                 (setq references (mail-header-references headers)))
3619       (setq headers (if (and references
3620                              (setq parent (gnus-parent-id references)))
3621                         (car (gnus-id-to-thread parent))
3622                       nil))
3623       (decf generation))
3624     (and (not (eq headers in-headers))
3625          headers)))
3626
3627 (defun gnus-id-to-thread (id)
3628   "Return the (sub-)thread where ID appears."
3629   (gnus-gethash id gnus-newsgroup-dependencies))
3630
3631 (defun gnus-id-to-article (id)
3632   "Return the article number of ID."
3633   (let ((thread (gnus-id-to-thread id)))
3634     (when (and thread
3635                (car thread))
3636       (mail-header-number (car thread)))))
3637
3638 (defun gnus-id-to-header (id)
3639   "Return the article headers of ID."
3640   (car (gnus-id-to-thread id)))
3641
3642 (defun gnus-article-displayed-root-p (article)
3643   "Say whether ARTICLE is a root(ish) article."
3644   (let ((level (gnus-summary-thread-level article))
3645         (refs (mail-header-references  (gnus-summary-article-header article)))
3646         particle)
3647     (cond
3648      ((null level) nil)
3649      ((zerop level) t)
3650      ((null refs) t)
3651      ((null (gnus-parent-id refs)) t)
3652      ((and (= 1 level)
3653            (null (setq particle (gnus-id-to-article
3654                                  (gnus-parent-id refs))))
3655            (null (gnus-summary-thread-level particle)))))))
3656
3657 (defun gnus-root-id (id)
3658   "Return the id of the root of the thread where ID appears."
3659   (let (last-id prev)
3660     (while (and id (setq prev (car (gnus-id-to-thread id))))
3661       (setq last-id id
3662             id (gnus-parent-id (mail-header-references prev))))
3663     last-id))
3664
3665 (defun gnus-articles-in-thread (thread)
3666   "Return the list of articles in THREAD."
3667   (cons (mail-header-number (car thread))
3668         (apply 'nconc (mapcar 'gnus-articles-in-thread (cdr thread)))))
3669
3670 (defun gnus-remove-thread (id &optional dont-remove)
3671   "Remove the thread that has ID in it."
3672   (let (headers thread last-id)
3673     ;; First go up in this thread until we find the root.
3674     (setq last-id (gnus-root-id id)
3675           headers (message-flatten-list (gnus-id-to-thread last-id)))
3676     ;; We have now found the real root of this thread.  It might have
3677     ;; been gathered into some loose thread, so we have to search
3678     ;; through the threads to find the thread we wanted.
3679     (let ((threads gnus-newsgroup-threads)
3680           sub)
3681       (while threads
3682         (setq sub (car threads))
3683         (if (stringp (car sub))
3684             ;; This is a gathered thread, so we look at the roots
3685             ;; below it to find whether this article is in this
3686             ;; gathered root.
3687             (progn
3688               (setq sub (cdr sub))
3689               (while sub
3690                 (when (member (caar sub) headers)
3691                   (setq thread (car threads)
3692                         threads nil
3693                         sub nil))
3694                 (setq sub (cdr sub))))
3695           ;; It's an ordinary thread, so we check it.
3696           (when (eq (car sub) (car headers))
3697             (setq thread sub
3698                   threads nil)))
3699         (setq threads (cdr threads)))
3700       ;; If this article is in no thread, then it's a root.
3701       (if thread
3702           (unless dont-remove
3703             (setq gnus-newsgroup-threads (delq thread gnus-newsgroup-threads)))
3704         (setq thread (gnus-id-to-thread last-id)))
3705       (when thread
3706         (prog1
3707             thread                      ; We return this thread.
3708           (unless dont-remove
3709             (if (stringp (car thread))
3710                 (progn
3711                   ;; If we use dummy roots, then we have to remove the
3712                   ;; dummy root as well.
3713                   (when (eq gnus-summary-make-false-root 'dummy)
3714                     ;; We go to the dummy root by going to
3715                     ;; the first sub-"thread", and then one line up.
3716                     (gnus-summary-goto-article
3717                      (mail-header-number (caadr thread)))
3718                     (forward-line -1)
3719                     (gnus-delete-line)
3720                     (gnus-data-compute-positions))
3721                   (setq thread (cdr thread))
3722                   (while thread
3723                     (gnus-remove-thread-1 (car thread))
3724                     (setq thread (cdr thread))))
3725               (gnus-remove-thread-1 thread))))))))
3726
3727 (defun gnus-remove-thread-1 (thread)
3728   "Remove the thread THREAD recursively."
3729   (let ((number (mail-header-number (pop thread)))
3730         d)
3731     (setq thread (reverse thread))
3732     (while thread
3733       (gnus-remove-thread-1 (pop thread)))
3734     (when (setq d (gnus-data-find number))
3735       (goto-char (gnus-data-pos d))
3736       (gnus-summary-show-thread)
3737       (gnus-data-remove
3738        number
3739        (- (gnus-point-at-bol)
3740           (prog1
3741               (1+ (gnus-point-at-eol))
3742             (gnus-delete-line)))))))
3743
3744 (defun gnus-sort-threads-1 (threads func)
3745   (sort (mapcar (lambda (thread)
3746                   (cons (car thread)
3747                         (and (cdr thread)
3748                              (gnus-sort-threads-1 (cdr thread) func))))
3749                 threads) func))
3750
3751 (defun gnus-sort-threads (threads)
3752   "Sort THREADS."
3753   (if (not gnus-thread-sort-functions)
3754       threads
3755     (gnus-message 8 "Sorting threads...")
3756     (prog1
3757         (gnus-sort-threads-1
3758          threads
3759          (gnus-make-sort-function gnus-thread-sort-functions))
3760       (gnus-message 8 "Sorting threads...done"))))
3761
3762 (defun gnus-sort-articles (articles)
3763   "Sort ARTICLES."
3764   (when gnus-article-sort-functions
3765     (gnus-message 7 "Sorting articles...")
3766     (prog1
3767         (setq gnus-newsgroup-headers
3768               (sort articles (gnus-make-sort-function
3769                               gnus-article-sort-functions)))
3770       (gnus-message 7 "Sorting articles...done"))))
3771
3772 ;; Written by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
3773 (defmacro gnus-thread-header (thread)
3774   "Return header of first article in THREAD.
3775 Note that THREAD must never, ever be anything else than a variable -
3776 using some other form will lead to serious barfage."
3777   (or (symbolp thread) (signal 'wrong-type-argument '(symbolp thread)))
3778   ;; (8% speedup to gnus-summary-prepare, just for fun :-)
3779   (list 'byte-code "\10\211:\203\17\0\211@;\203\16\0A@@\207"
3780         (vector thread) 2))
3781
3782 (defsubst gnus-article-sort-by-number (h1 h2)
3783   "Sort articles by article number."
3784   (< (mail-header-number h1)
3785      (mail-header-number h2)))
3786
3787 (defun gnus-thread-sort-by-number (h1 h2)
3788   "Sort threads by root article number."
3789   (gnus-article-sort-by-number
3790    (gnus-thread-header h1) (gnus-thread-header h2)))
3791
3792 (defsubst gnus-article-sort-by-lines (h1 h2)
3793   "Sort articles by article Lines header."
3794   (< (mail-header-lines h1)
3795      (mail-header-lines h2)))
3796
3797 (defun gnus-thread-sort-by-lines (h1 h2)
3798   "Sort threads by root article Lines header."
3799   (gnus-article-sort-by-lines
3800    (gnus-thread-header h1) (gnus-thread-header h2)))
3801
3802 (defsubst gnus-article-sort-by-chars (h1 h2)
3803   "Sort articles by octet length."
3804   (< (mail-header-chars h1)
3805      (mail-header-chars h2)))
3806
3807 (defun gnus-thread-sort-by-chars (h1 h2)
3808   "Sort threads by root article octet length."
3809   (gnus-article-sort-by-chars
3810    (gnus-thread-header h1) (gnus-thread-header h2)))
3811
3812 (defsubst gnus-article-sort-by-author (h1 h2)
3813   "Sort articles by root author."
3814   (string-lessp
3815    (let ((extract (funcall
3816                    gnus-extract-address-components
3817                    (mail-header-from h1))))
3818      (or (car extract) (cadr extract) ""))
3819    (let ((extract (funcall
3820                    gnus-extract-address-components
3821                    (mail-header-from h2))))
3822      (or (car extract) (cadr extract) ""))))
3823
3824 (defun gnus-thread-sort-by-author (h1 h2)
3825   "Sort threads by root author."
3826   (gnus-article-sort-by-author
3827    (gnus-thread-header h1)  (gnus-thread-header h2)))
3828
3829 (defsubst gnus-article-sort-by-subject (h1 h2)
3830   "Sort articles by root subject."
3831   (string-lessp
3832    (downcase (gnus-simplify-subject-re (mail-header-subject h1)))
3833    (downcase (gnus-simplify-subject-re (mail-header-subject h2)))))
3834
3835 (defun gnus-thread-sort-by-subject (h1 h2)
3836   "Sort threads by root subject."
3837   (gnus-article-sort-by-subject
3838    (gnus-thread-header h1) (gnus-thread-header h2)))
3839
3840 (defsubst gnus-article-sort-by-date (h1 h2)
3841   "Sort articles by root article date."
3842   (time-less-p
3843    (gnus-date-get-time (mail-header-date h1))
3844    (gnus-date-get-time (mail-header-date h2))))
3845
3846 (defun gnus-thread-sort-by-date (h1 h2)
3847   "Sort threads by root article date."
3848   (gnus-article-sort-by-date
3849    (gnus-thread-header h1) (gnus-thread-header h2)))
3850
3851 (defsubst gnus-article-sort-by-score (h1 h2)
3852   "Sort articles by root article score.
3853 Unscored articles will be counted as having a score of zero."
3854   (> (or (cdr (assq (mail-header-number h1)
3855                     gnus-newsgroup-scored))
3856          gnus-summary-default-score 0)
3857      (or (cdr (assq (mail-header-number h2)
3858                     gnus-newsgroup-scored))
3859          gnus-summary-default-score 0)))
3860
3861 (defun gnus-thread-sort-by-score (h1 h2)
3862   "Sort threads by root article score."
3863   (gnus-article-sort-by-score
3864    (gnus-thread-header h1) (gnus-thread-header h2)))
3865
3866 (defun gnus-thread-sort-by-total-score (h1 h2)
3867   "Sort threads by the sum of all scores in the thread.
3868 Unscored articles will be counted as having a score of zero."
3869   (> (gnus-thread-total-score h1) (gnus-thread-total-score h2)))
3870
3871 (defun gnus-thread-total-score (thread)
3872   ;; This function find the total score of THREAD.
3873   (cond ((null thread)
3874          0)
3875         ((consp thread)
3876          (if (stringp (car thread))
3877              (apply gnus-thread-score-function 0
3878                     (mapcar 'gnus-thread-total-score-1 (cdr thread)))
3879            (gnus-thread-total-score-1 thread)))
3880         (t
3881          (gnus-thread-total-score-1 (list thread)))))
3882
3883 (defun gnus-thread-total-score-1 (root)
3884   ;; This function find the total score of the thread below ROOT.
3885   (setq root (car root))
3886   (apply gnus-thread-score-function
3887          (or (append
3888               (mapcar 'gnus-thread-total-score
3889                       (cdr (gnus-id-to-thread (mail-header-id root))))
3890               (when (> (mail-header-number root) 0)
3891                 (list (or (cdr (assq (mail-header-number root)
3892                                      gnus-newsgroup-scored))
3893                           gnus-summary-default-score 0))))
3894              (list gnus-summary-default-score)
3895              '(0))))
3896
3897 ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
3898 (defvar gnus-tmp-prev-subject nil)
3899 (defvar gnus-tmp-false-parent nil)
3900 (defvar gnus-tmp-root-expunged nil)
3901 (defvar gnus-tmp-dummy-line nil)
3902
3903 (eval-when-compile (defvar gnus-tmp-header))
3904 (defun gnus-extra-header (type &optional header)
3905   "Return the extra header of TYPE."
3906   (or (cdr (assq type (mail-header-extra (or header gnus-tmp-header))))
3907       ""))
3908
3909 (defun gnus-summary-prepare-threads (threads)
3910   "Prepare summary buffer from THREADS and indentation LEVEL.
3911 THREADS is either a list of `(PARENT [(CHILD1 [(GRANDCHILD ...]...) ...])'
3912 or a straight list of headers."
3913   (gnus-message 7 "Generating summary...")
3914
3915   (setq gnus-newsgroup-threads threads)
3916   (beginning-of-line)
3917
3918   (let ((gnus-tmp-level 0)
3919         (default-score (or gnus-summary-default-score 0))
3920         (gnus-visual-p (gnus-visual-p 'summary-highlight 'highlight))
3921         thread number subject stack state gnus-tmp-gathered beg-match
3922         new-roots gnus-tmp-new-adopts thread-end
3923         gnus-tmp-header gnus-tmp-unread
3924         gnus-tmp-replied gnus-tmp-subject-or-nil
3925         gnus-tmp-dummy gnus-tmp-indentation gnus-tmp-lines gnus-tmp-score
3926         gnus-tmp-score-char gnus-tmp-from gnus-tmp-name
3927         gnus-tmp-number gnus-tmp-opening-bracket gnus-tmp-closing-bracket)
3928
3929     (setq gnus-tmp-prev-subject nil)
3930
3931     (if (vectorp (car threads))
3932         ;; If this is a straight (sic) list of headers, then a
3933         ;; threaded summary display isn't required, so we just create
3934         ;; an unthreaded one.
3935         (gnus-summary-prepare-unthreaded threads)
3936
3937       ;; Do the threaded display.
3938
3939       (while (or threads stack gnus-tmp-new-adopts new-roots)
3940
3941         (if (and (= gnus-tmp-level 0)
3942                  (or (not stack)
3943                      (= (caar stack) 0))
3944                  (not gnus-tmp-false-parent)
3945                  (or gnus-tmp-new-adopts new-roots))
3946             (if gnus-tmp-new-adopts
3947                 (setq gnus-tmp-level (if gnus-tmp-root-expunged 0 1)
3948                       thread (list (car gnus-tmp-new-adopts))
3949                       gnus-tmp-header (caar thread)
3950                       gnus-tmp-new-adopts (cdr gnus-tmp-new-adopts))
3951               (when new-roots
3952                 (setq thread (list (car new-roots))
3953                       gnus-tmp-header (caar thread)
3954                       new-roots (cdr new-roots))))
3955
3956           (if threads
3957               ;; If there are some threads, we do them before the
3958               ;; threads on the stack.
3959               (setq thread threads
3960                     gnus-tmp-header (caar thread))
3961             ;; There were no current threads, so we pop something off
3962             ;; the stack.
3963             (setq state (car stack)
3964                   gnus-tmp-level (car state)
3965                   thread (cdr state)
3966                   stack (cdr stack)
3967                   gnus-tmp-header (caar thread))))
3968
3969         (setq gnus-tmp-false-parent nil)
3970         (setq gnus-tmp-root-expunged nil)
3971         (setq thread-end nil)
3972
3973         (if (stringp gnus-tmp-header)
3974             ;; The header is a dummy root.
3975             (cond
3976              ((eq gnus-summary-make-false-root 'adopt)
3977               ;; We let the first article adopt the rest.
3978               (setq gnus-tmp-new-adopts (nconc gnus-tmp-new-adopts
3979                                                (cddar thread)))
3980               (setq gnus-tmp-gathered
3981                     (nconc (mapcar
3982                             (lambda (h) (mail-header-number (car h)))
3983                             (cddar thread))
3984                            gnus-tmp-gathered))
3985               (setq thread (cons (list (caar thread)
3986                                        (cadar thread))
3987                                  (cdr thread)))
3988               (setq gnus-tmp-level -1
3989                     gnus-tmp-false-parent t))
3990              ((eq gnus-summary-make-false-root 'empty)
3991               ;; We print adopted articles with empty subject fields.
3992               (setq gnus-tmp-gathered
3993                     (nconc (mapcar
3994                             (lambda (h) (mail-header-number (car h)))
3995                             (cddar thread))
3996                            gnus-tmp-gathered))
3997               (setq gnus-tmp-level -1))
3998              ((eq gnus-summary-make-false-root 'dummy)
3999               ;; We remember that we probably want to output a dummy
4000               ;; root.
4001               (setq gnus-tmp-dummy-line gnus-tmp-header)
4002               (setq gnus-tmp-prev-subject gnus-tmp-header))
4003              (t
4004               ;; We do not make a root for the gathered
4005               ;; sub-threads at all.
4006               (setq gnus-tmp-level -1)))
4007
4008           (setq number (mail-header-number gnus-tmp-header)
4009                 subject (mail-header-subject gnus-tmp-header))
4010
4011           (cond
4012            ;; If the thread has changed subject, we might want to make
4013            ;; this subthread into a root.
4014            ((and (null gnus-thread-ignore-subject)
4015                  (not (zerop gnus-tmp-level))
4016                  gnus-tmp-prev-subject
4017                  (not (inline
4018                         (gnus-subject-equal gnus-tmp-prev-subject subject))))
4019             (setq new-roots (nconc new-roots (list (car thread)))
4020                   thread-end t
4021                   gnus-tmp-header nil))
4022            ;; If the article lies outside the current limit,
4023            ;; then we do not display it.
4024            ((not (memq number gnus-newsgroup-limit))
4025             (setq gnus-tmp-gathered
4026                   (nconc (mapcar
4027                           (lambda (h) (mail-header-number (car h)))
4028                           (cdar thread))
4029                          gnus-tmp-gathered))
4030             (setq gnus-tmp-new-adopts (if (cdar thread)
4031                                           (append gnus-tmp-new-adopts
4032                                                   (cdar thread))
4033                                         gnus-tmp-new-adopts)
4034                   thread-end t
4035                   gnus-tmp-header nil)
4036             (when (zerop gnus-tmp-level)
4037               (setq gnus-tmp-root-expunged t)))
4038            ;; Perhaps this article is to be marked as read?
4039            ((and gnus-summary-mark-below
4040                  (< (or (cdr (assq number gnus-newsgroup-scored))
4041                         default-score)
4042                     gnus-summary-mark-below)
4043                  ;; Don't touch sparse articles.
4044                  (not (gnus-summary-article-sparse-p number))
4045                  (not (gnus-summary-article-ancient-p number)))
4046             (setq gnus-newsgroup-unreads
4047                   (delq number gnus-newsgroup-unreads))
4048             (if gnus-newsgroup-auto-expire
4049                 (push number gnus-newsgroup-expirable)
4050               (push (cons number gnus-low-score-mark)
4051                     gnus-newsgroup-reads))))
4052
4053           (when gnus-tmp-header
4054             ;; We may have an old dummy line to output before this
4055             ;; article.
4056             (when (and gnus-tmp-dummy-line
4057                        (gnus-subject-equal
4058                         gnus-tmp-dummy-line
4059                         (mail-header-subject gnus-tmp-header)))
4060               (gnus-summary-insert-dummy-line
4061                gnus-tmp-dummy-line (mail-header-number gnus-tmp-header))
4062               (setq gnus-tmp-dummy-line nil))
4063
4064             ;; Compute the mark.
4065             (setq gnus-tmp-unread (gnus-article-mark number))
4066
4067             (push (gnus-data-make number gnus-tmp-unread (1+ (point))
4068                                   gnus-tmp-header gnus-tmp-level)
4069                   gnus-newsgroup-data)
4070
4071             ;; Actually insert the line.
4072             (setq
4073              gnus-tmp-subject-or-nil
4074              (cond
4075               ((and gnus-thread-ignore-subject
4076                     gnus-tmp-prev-subject
4077                     (not (inline (gnus-subject-equal
4078                                   gnus-tmp-prev-subject subject))))
4079                subject)
4080               ((zerop gnus-tmp-level)
4081                (if (and (eq gnus-summary-make-false-root 'empty)
4082                         (memq number gnus-tmp-gathered)
4083                         gnus-tmp-prev-subject
4084                         (inline (gnus-subject-equal
4085                                  gnus-tmp-prev-subject subject)))
4086                    gnus-summary-same-subject
4087                  subject))
4088               (t gnus-summary-same-subject)))
4089             (if (and (eq gnus-summary-make-false-root 'adopt)
4090                      (= gnus-tmp-level 1)
4091                      (memq number gnus-tmp-gathered))
4092                 (setq gnus-tmp-opening-bracket ?\<
4093                       gnus-tmp-closing-bracket ?\>)
4094               (setq gnus-tmp-opening-bracket ?\[
4095                     gnus-tmp-closing-bracket ?\]))
4096             (setq
4097              gnus-tmp-indentation
4098              (aref gnus-thread-indent-array gnus-tmp-level)
4099              gnus-tmp-lines (mail-header-lines gnus-tmp-header)
4100              gnus-tmp-score (or (cdr (assq number gnus-newsgroup-scored))
4101                                 gnus-summary-default-score 0)
4102              gnus-tmp-score-char
4103              (if (or (null gnus-summary-default-score)
4104                      (<= (abs (- gnus-tmp-score gnus-summary-default-score))
4105                          gnus-summary-zcore-fuzz))
4106                  ?  ;Whitespace
4107                (if (< gnus-tmp-score gnus-summary-default-score)
4108                    gnus-score-below-mark gnus-score-over-mark))
4109              gnus-tmp-replied
4110              (cond ((memq number gnus-newsgroup-processable)
4111                     gnus-process-mark)
4112                    ((memq number gnus-newsgroup-cached)
4113                     gnus-cached-mark)
4114                    ((memq number gnus-newsgroup-replied)
4115                     gnus-replied-mark)
4116                    ((memq number gnus-newsgroup-saved)
4117                     gnus-saved-mark)
4118                    (t gnus-unread-mark))
4119              gnus-tmp-from (mail-header-from gnus-tmp-header)
4120              gnus-tmp-name
4121              (cond
4122               ((string-match "<[^>]+> *$" gnus-tmp-from)
4123                (setq beg-match (match-beginning 0))
4124                (or (and (string-match "^\"[^\"]*\"" gnus-tmp-from)
4125                         (substring gnus-tmp-from (1+ (match-beginning 0))
4126                                    (1- (match-end 0))))
4127                    (substring gnus-tmp-from 0 beg-match)))
4128               ((string-match "(.+)" gnus-tmp-from)
4129                (substring gnus-tmp-from
4130                           (1+ (match-beginning 0)) (1- (match-end 0))))
4131               (t gnus-tmp-from)))
4132             (when (string= gnus-tmp-name "")
4133               (setq gnus-tmp-name gnus-tmp-from))
4134             (unless (numberp gnus-tmp-lines)
4135               (setq gnus-tmp-lines 0))
4136             (gnus-put-text-property
4137              (point)
4138              (progn (eval gnus-summary-line-format-spec) (point))
4139              'gnus-number number)
4140             (when gnus-visual-p
4141               (forward-line -1)
4142               (gnus-run-hooks 'gnus-summary-update-hook)
4143               (forward-line 1))
4144
4145             (setq gnus-tmp-prev-subject subject)))
4146
4147         (when (nth 1 thread)
4148           (push (cons (max 0 gnus-tmp-level) (nthcdr 1 thread)) stack))
4149         (incf gnus-tmp-level)
4150         (setq threads (if thread-end nil (cdar thread)))
4151         (unless threads
4152           (setq gnus-tmp-level 0)))))
4153   (gnus-message 7 "Generating summary...done"))
4154
4155 (defun gnus-summary-prepare-unthreaded (headers)
4156   "Generate an unthreaded summary buffer based on HEADERS."
4157   (let (header number mark)
4158
4159     (beginning-of-line)
4160
4161     (while headers
4162       ;; We may have to root out some bad articles...
4163       (when (memq (setq number (mail-header-number
4164                                 (setq header (pop headers))))
4165                   gnus-newsgroup-limit)
4166         ;; Mark article as read when it has a low score.
4167         (when (and gnus-summary-mark-below
4168                    (< (or (cdr (assq number gnus-newsgroup-scored))
4169                           gnus-summary-default-score 0)
4170                       gnus-summary-mark-below)
4171                    (not (gnus-summary-article-ancient-p number)))
4172           (setq gnus-newsgroup-unreads
4173                 (delq number gnus-newsgroup-unreads))
4174           (if gnus-newsgroup-auto-expire
4175               (push number gnus-newsgroup-expirable)
4176             (push (cons number gnus-low-score-mark)
4177                   gnus-newsgroup-reads)))
4178
4179         (setq mark (gnus-article-mark number))
4180         (push (gnus-data-make number mark (1+ (point)) header 0)
4181               gnus-newsgroup-data)
4182         (gnus-summary-insert-line
4183          header 0 number
4184          mark (memq number gnus-newsgroup-replied)
4185          (memq number gnus-newsgroup-expirable)
4186          (mail-header-subject header) nil
4187          (cdr (assq number gnus-newsgroup-scored))
4188          (memq number gnus-newsgroup-processable))))))
4189
4190 (defun gnus-summary-remove-list-identifiers ()
4191   "Remove list identifiers in `gnus-list-identifiers' from articles in the current group."
4192   (let ((regexp (if (stringp gnus-list-identifiers)
4193                     gnus-list-identifiers
4194                   (mapconcat 'identity gnus-list-identifiers " *\\|"))))
4195     (dolist (header gnus-newsgroup-headers)
4196       (when (string-match (concat "\\(\\(\\(Re: +\\)?\\(" regexp
4197                                   " *\\)\\)+\\(Re: +\\)?\\)")
4198                           (mail-header-subject header))
4199         (mail-header-set-subject
4200          header (concat (substring (mail-header-subject header)
4201                                    0 (match-beginning 1))
4202                         (or
4203                          (match-string 3 (mail-header-subject header))
4204                          (match-string 5 (mail-header-subject header)))
4205                         (substring (mail-header-subject header)
4206                                    (match-end 1))))))))
4207
4208 (defun gnus-select-newsgroup (group &optional read-all select-articles)
4209   "Select newsgroup GROUP.
4210 If READ-ALL is non-nil, all articles in the group are selected.
4211 If SELECT-ARTICLES, only select those articles from GROUP."
4212   (let* ((entry (gnus-gethash group gnus-newsrc-hashtb))
4213          ;;!!! Dirty hack; should be removed.
4214          (gnus-summary-ignore-duplicates
4215           (if (eq (car (gnus-find-method-for-group group)) 'nnvirtual)
4216               t
4217             gnus-summary-ignore-duplicates))
4218          (info (nth 2 entry))
4219          articles fetched-articles cached)
4220
4221     (unless (gnus-check-server
4222              (set (make-local-variable 'gnus-current-select-method)
4223                   (gnus-find-method-for-group group)))
4224       (error "Couldn't open server"))
4225
4226     (or (and entry (not (eq (car entry) t))) ; Either it's active...
4227         (gnus-activate-group group)     ; Or we can activate it...
4228         (progn                          ; Or we bug out.
4229           (when (equal major-mode 'gnus-summary-mode)
4230             (kill-buffer (current-buffer)))
4231           (error "Couldn't request group %s: %s"
4232                  group (gnus-status-message group))))
4233
4234     (unless (gnus-request-group group t)
4235       (when (equal major-mode 'gnus-summary-mode)
4236         (kill-buffer (current-buffer)))
4237       (error "Couldn't request group %s: %s"
4238              group (gnus-status-message group)))
4239
4240     (setq gnus-newsgroup-name group)
4241     (setq gnus-newsgroup-unselected nil)
4242     (setq gnus-newsgroup-unreads (gnus-list-of-unread-articles group))
4243     (gnus-summary-setup-default-charset)
4244
4245     ;; Adjust and set lists of article marks.
4246     (when info
4247       (gnus-adjust-marked-articles info))
4248
4249     ;; Kludge to avoid having cached articles nixed out in virtual groups.
4250     (when (gnus-virtual-group-p group)
4251       (setq cached gnus-newsgroup-cached))
4252
4253     (setq gnus-newsgroup-unreads
4254           (gnus-set-difference
4255            (gnus-set-difference gnus-newsgroup-unreads gnus-newsgroup-marked)
4256            gnus-newsgroup-dormant))
4257
4258     (setq gnus-newsgroup-processable nil)
4259
4260     (gnus-update-read-articles group gnus-newsgroup-unreads)
4261
4262     (if (setq articles select-articles)
4263         (setq gnus-newsgroup-unselected
4264               (gnus-sorted-intersection
4265                gnus-newsgroup-unreads
4266                (gnus-sorted-complement gnus-newsgroup-unreads articles)))
4267       (setq articles (gnus-articles-to-read group read-all)))
4268
4269     (cond
4270      ((null articles)
4271       ;;(gnus-message 3 "Couldn't select newsgroup -- no articles to display")
4272       'quit)
4273      ((eq articles 0) nil)
4274      (t
4275       ;; Init the dependencies hash table.
4276       (setq gnus-newsgroup-dependencies
4277             (gnus-make-hashtable (length articles)))
4278       (gnus-set-global-variables)
4279       ;; Retrieve the headers and read them in.
4280       (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
4281       (setq gnus-newsgroup-headers
4282             (if (eq 'nov
4283                     (setq gnus-headers-retrieved-by
4284                           (gnus-retrieve-headers
4285                            articles gnus-newsgroup-name
4286                            ;; We might want to fetch old headers, but
4287                            ;; not if there is only 1 article.
4288                            (and (or (and
4289                                      (not (eq gnus-fetch-old-headers 'some))
4290                                      (not (numberp gnus-fetch-old-headers)))
4291                                     (> (length articles) 1))
4292                                 gnus-fetch-old-headers))))
4293                 (gnus-get-newsgroup-headers-xover
4294                  articles nil nil gnus-newsgroup-name t)
4295               (gnus-get-newsgroup-headers)))
4296       (gnus-message 5 "Fetching headers for %s...done" gnus-newsgroup-name)
4297
4298       ;; Kludge to avoid having cached articles nixed out in virtual groups.
4299       (when cached
4300         (setq gnus-newsgroup-cached cached))
4301
4302       ;; Suppress duplicates?
4303       (when gnus-suppress-duplicates
4304         (gnus-dup-suppress-articles))
4305
4306       ;; Set the initial limit.
4307       (setq gnus-newsgroup-limit (copy-sequence articles))
4308       ;; Remove canceled articles from the list of unread articles.
4309       (setq gnus-newsgroup-unreads
4310             (gnus-set-sorted-intersection
4311              gnus-newsgroup-unreads
4312              (setq fetched-articles
4313                    (mapcar (lambda (headers) (mail-header-number headers))
4314                            gnus-newsgroup-headers))))
4315       ;; Removed marked articles that do not exist.
4316       (gnus-update-missing-marks
4317        (gnus-sorted-complement fetched-articles articles))
4318       ;; We might want to build some more threads first.
4319       (when (and gnus-fetch-old-headers
4320                  (eq gnus-headers-retrieved-by 'nov))
4321         (if (eq gnus-fetch-old-headers 'invisible)
4322             (gnus-build-all-threads)
4323           (gnus-build-old-threads)))
4324       ;; Let the Gnus agent mark articles as read.
4325       (when gnus-agent
4326         (gnus-agent-get-undownloaded-list))
4327       ;; Remove list identifiers from subject
4328       (when gnus-list-identifiers
4329         (gnus-summary-remove-list-identifiers))
4330       ;; Check whether auto-expire is to be done in this group.
4331       (setq gnus-newsgroup-auto-expire
4332             (gnus-group-auto-expirable-p group))
4333       ;; Set up the article buffer now, if necessary.
4334       (unless gnus-single-article-buffer
4335         (gnus-article-setup-buffer))
4336       ;; First and last article in this newsgroup.
4337       (when gnus-newsgroup-headers
4338         (setq gnus-newsgroup-begin
4339               (mail-header-number (car gnus-newsgroup-headers))
4340               gnus-newsgroup-end
4341               (mail-header-number
4342                (gnus-last-element gnus-newsgroup-headers))))
4343       ;; GROUP is successfully selected.
4344       (or gnus-newsgroup-headers t)))))
4345
4346 (defun gnus-articles-to-read (group &optional read-all)
4347   "Find out what articles the user wants to read."
4348   (let* ((articles
4349           ;; Select all articles if `read-all' is non-nil, or if there
4350           ;; are no unread articles.
4351           (if (or read-all
4352                   (and (zerop (length gnus-newsgroup-marked))
4353                        (zerop (length gnus-newsgroup-unreads)))
4354                   (eq (gnus-group-find-parameter group 'display)
4355                       'all))
4356               (or
4357                (gnus-uncompress-range (gnus-active group))
4358                (gnus-cache-articles-in-group group))
4359             (sort (append gnus-newsgroup-dormant gnus-newsgroup-marked
4360                           (copy-sequence gnus-newsgroup-unreads))
4361                   '<)))
4362          (scored-list (gnus-killed-articles gnus-newsgroup-killed articles))
4363          (scored (length scored-list))
4364          (number (length articles))
4365          (marked (+ (length gnus-newsgroup-marked)
4366                     (length gnus-newsgroup-dormant)))
4367          (select
4368           (cond
4369            ((numberp read-all)
4370             read-all)
4371            (t
4372             (condition-case ()
4373                 (cond
4374                  ((and (or (<= scored marked) (= scored number))
4375                        (numberp gnus-large-newsgroup)
4376                        (> number gnus-large-newsgroup))
4377                   (let ((input
4378                          (read-string
4379                           (format
4380                            "How many articles from %s (default %d): "
4381                            (gnus-limit-string gnus-newsgroup-name 35)
4382                            number))))
4383                     (if (string-match "^[ \t]*$" input) number input)))
4384                  ((and (> scored marked) (< scored number)
4385                        (> (- scored number) 20))
4386                   (let ((input
4387                          (read-string
4388                           (format "%s %s (%d scored, %d total): "
4389                                   "How many articles from"
4390                                   group scored number))))
4391                     (if (string-match "^[ \t]*$" input)
4392                         number input)))
4393                  (t number))
4394               (quit
4395                (message "Quit getting the articles to read")
4396                nil))))))
4397     (setq select (if (stringp select) (string-to-number select) select))
4398     (if (or (null select) (zerop select))
4399         select
4400       (if (and (not (zerop scored)) (<= (abs select) scored))
4401           (progn
4402             (setq articles (sort scored-list '<))
4403             (setq number (length articles)))
4404         (setq articles (copy-sequence articles)))
4405
4406       (when (< (abs select) number)
4407         (if (< select 0)
4408             ;; Select the N oldest articles.
4409             (setcdr (nthcdr (1- (abs select)) articles) nil)
4410           ;; Select the N most recent articles.
4411           (setq articles (nthcdr (- number select) articles))))
4412       (setq gnus-newsgroup-unselected
4413             (gnus-sorted-intersection
4414              gnus-newsgroup-unreads
4415              (gnus-sorted-complement gnus-newsgroup-unreads articles)))
4416       (when gnus-alter-articles-to-read-function
4417         (setq gnus-newsgroup-unreads
4418               (sort
4419                (funcall gnus-alter-articles-to-read-function
4420                         gnus-newsgroup-name gnus-newsgroup-unreads)
4421                '<)))
4422       articles)))
4423
4424 (defun gnus-killed-articles (killed articles)
4425   (let (out)
4426     (while articles
4427       (when (inline (gnus-member-of-range (car articles) killed))
4428         (push (car articles) out))
4429       (setq articles (cdr articles)))
4430     out))
4431
4432 (defun gnus-uncompress-marks (marks)
4433   "Uncompress the mark ranges in MARKS."
4434   (let ((uncompressed '(score bookmark))
4435         out)
4436     (while marks
4437       (if (memq (caar marks) uncompressed)
4438           (push (car marks) out)
4439         (push (cons (caar marks) (gnus-uncompress-range (cdar marks))) out))
4440       (setq marks (cdr marks)))
4441     out))
4442
4443 (defun gnus-adjust-marked-articles (info)
4444   "Set all article lists and remove all marks that are no longer valid."
4445   (let* ((marked-lists (gnus-info-marks info))
4446          (active (gnus-active (gnus-info-group info)))
4447          (min (car active))
4448          (max (cdr active))
4449          (types gnus-article-mark-lists)
4450          (uncompressed '(score bookmark killed))
4451          marks var articles article mark)
4452
4453     (while marked-lists
4454       (setq marks (pop marked-lists))
4455       (set (setq var (intern (format "gnus-newsgroup-%s"
4456                                      (car (rassq (setq mark (car marks))
4457                                                  types)))))
4458            (if (memq (car marks) uncompressed) (cdr marks)
4459              (gnus-uncompress-range (cdr marks))))
4460
4461       (setq articles (symbol-value var))
4462
4463       ;; All articles have to be subsets of the active articles.
4464       (cond
4465        ;; Adjust "simple" lists.
4466        ((memq mark '(tick dormant expire reply save))
4467         (while articles
4468           (when (or (< (setq article (pop articles)) min) (> article max))
4469             (set var (delq article (symbol-value var))))))
4470        ;; Adjust assocs.
4471        ((memq mark uncompressed)
4472         (when (not (listp (cdr (symbol-value var))))
4473           (set var (list (symbol-value var))))
4474         (when (not (listp (cdr articles)))
4475           (setq articles (list articles)))
4476         (while articles
4477           (when (or (not (consp (setq article (pop articles))))
4478                     (< (car article) min)
4479                     (> (car article) max))
4480             (set var (delq article (symbol-value var))))))))))
4481
4482 (defun gnus-update-missing-marks (missing)
4483   "Go through the list of MISSING articles and remove them from the mark lists."
4484   (when missing
4485     (let ((types gnus-article-mark-lists)
4486           var m)
4487       ;; Go through all types.
4488       (while types
4489         (setq var (intern (format "gnus-newsgroup-%s" (car (pop types)))))
4490         (when (symbol-value var)
4491           ;; This list has articles.  So we delete all missing articles
4492           ;; from it.
4493           (setq m missing)
4494           (while m
4495             (set var (delq (pop m) (symbol-value var)))))))))
4496
4497 (defun gnus-update-marks ()
4498   "Enter the various lists of marked articles into the newsgroup info list."
4499   (let ((types gnus-article-mark-lists)
4500         (info (gnus-get-info gnus-newsgroup-name))
4501         (uncompressed '(score bookmark killed))
4502         type list newmarked symbol delta-marks)
4503     (when info
4504       ;; Add all marks lists to the list of marks lists.
4505       (while (setq type (pop types))
4506         (setq list (symbol-value
4507                     (setq symbol
4508                           (intern (format "gnus-newsgroup-%s"
4509                                           (car type))))))
4510
4511         (when list
4512           ;; Get rid of the entries of the articles that have the
4513           ;; default score.
4514           (when (and (eq (cdr type) 'score)
4515                      gnus-save-score
4516                      list)
4517             (let* ((arts list)
4518                    (prev (cons nil list))
4519                    (all prev))
4520               (while arts
4521                 (if (or (not (consp (car arts)))
4522                         (= (cdar arts) gnus-summary-default-score))
4523                     (setcdr prev (cdr arts))
4524                   (setq prev arts))
4525                 (setq arts (cdr arts)))
4526               (setq list (cdr all)))))
4527
4528         (unless (memq (cdr type) uncompressed)
4529           (setq list (gnus-compress-sequence (set symbol (sort list '<)) t)))
4530
4531         (when (gnus-check-backend-function
4532                'request-set-mark gnus-newsgroup-name)
4533           ;; propagate flags to server, with the following exceptions:
4534           ;; uncompressed:s are not proper flags (they are cons cells)
4535           ;; cache is a internal gnus flag
4536           ;; download are local to one gnus installation (well)
4537           ;; unsend are for nndraft groups only
4538           ;; xxx: generality of this?  this suits nnimap anyway
4539           (unless (memq (cdr type) (append '(cache download unsend)
4540                                            uncompressed))
4541             (let* ((old (cdr (assq (cdr type) (gnus-info-marks info))))
4542                    (del (gnus-remove-from-range (gnus-copy-sequence old) list))
4543                    (add (gnus-remove-from-range
4544                          (gnus-copy-sequence list) old)))
4545               (when add
4546                 (push (list add 'add (list (cdr type))) delta-marks))
4547               (when del
4548                 (push (list del 'del (list (cdr type))) delta-marks)))))
4549
4550         (when list
4551           (push (cons (cdr type) list) newmarked)))
4552
4553       (when delta-marks
4554         (unless (gnus-check-group gnus-newsgroup-name)
4555           (error "Can't open server for %s" gnus-newsgroup-name))
4556         (gnus-request-set-mark gnus-newsgroup-name delta-marks))
4557
4558       ;; Enter these new marks into the info of the group.
4559       (if (nthcdr 3 info)
4560           (setcar (nthcdr 3 info) newmarked)
4561         ;; Add the marks lists to the end of the info.
4562         (when newmarked
4563           (setcdr (nthcdr 2 info) (list newmarked))))
4564
4565       ;; Cut off the end of the info if there's nothing else there.
4566       (let ((i 5))
4567         (while (and (> i 2)
4568                     (not (nth i info)))
4569           (when (nthcdr (decf i) info)
4570             (setcdr (nthcdr i info) nil)))))))
4571
4572 (defun gnus-set-mode-line (where)
4573   "Set the mode line of the article or summary buffers.
4574 If WHERE is `summary', the summary mode line format will be used."
4575   ;; Is this mode line one we keep updated?
4576   (when (and (memq where gnus-updated-mode-lines)
4577              (symbol-value
4578               (intern (format "gnus-%s-mode-line-format-spec" where))))
4579     (let (mode-string)
4580       (save-excursion
4581         ;; We evaluate this in the summary buffer since these
4582         ;; variables are buffer-local to that buffer.
4583         (set-buffer gnus-summary-buffer)
4584         ;; We bind all these variables that are used in the `eval' form
4585         ;; below.
4586         (let* ((mformat (symbol-value
4587                          (intern
4588                           (format "gnus-%s-mode-line-format-spec" where))))
4589                (gnus-tmp-group-name (gnus-group-name-decode
4590                                      gnus-newsgroup-name
4591                                      (gnus-group-name-charset
4592                                       nil
4593                                       gnus-newsgroup-name)))
4594                (gnus-tmp-article-number (or gnus-current-article 0))
4595                (gnus-tmp-unread gnus-newsgroup-unreads)
4596                (gnus-tmp-unread-and-unticked (length gnus-newsgroup-unreads))
4597                (gnus-tmp-unselected (length gnus-newsgroup-unselected))
4598                (gnus-tmp-unread-and-unselected
4599                 (cond ((and (zerop gnus-tmp-unread-and-unticked)
4600                             (zerop gnus-tmp-unselected))
4601                        "")
4602                       ((zerop gnus-tmp-unselected)
4603                        (format "{%d more}" gnus-tmp-unread-and-unticked))
4604                       (t (format "{%d(+%d) more}"
4605                                  gnus-tmp-unread-and-unticked
4606                                  gnus-tmp-unselected))))
4607                (gnus-tmp-subject
4608                 (if (and gnus-current-headers
4609                          (vectorp gnus-current-headers))
4610                     (gnus-mode-string-quote
4611                      (mail-header-subject gnus-current-headers))
4612                   ""))
4613                bufname-length max-len
4614                gnus-tmp-header);; passed as argument to any user-format-funcs
4615           (setq mode-string (eval mformat))
4616           (setq bufname-length (if (string-match "%b" mode-string)
4617                                    (- (length
4618                                        (buffer-name
4619                                         (if (eq where 'summary)
4620                                             nil
4621                                           (get-buffer gnus-article-buffer))))
4622                                       2)
4623                                  0))
4624           (setq max-len (max 4 (if gnus-mode-non-string-length
4625                                    (- (window-width)
4626                                       gnus-mode-non-string-length
4627                                       bufname-length)
4628                                  (length mode-string))))
4629           ;; We might have to chop a bit of the string off...
4630           (when (> (length mode-string) max-len)
4631             (setq mode-string
4632                   (concat (truncate-string-to-width mode-string (- max-len 3))
4633                           "...")))
4634           ;; Pad the mode string a bit.
4635           (setq mode-string (format (format "%%-%ds" max-len) mode-string))))
4636       ;; Update the mode line.
4637       (setq mode-line-buffer-identification
4638             (gnus-mode-line-buffer-identification (list mode-string)))
4639       (set-buffer-modified-p t))))
4640
4641 (defun gnus-create-xref-hashtb (from-newsgroup headers unreads)
4642   "Go through the HEADERS list and add all Xrefs to a hash table.
4643 The resulting hash table is returned, or nil if no Xrefs were found."
4644   (let* ((virtual (gnus-virtual-group-p from-newsgroup))
4645          (prefix (if virtual "" (gnus-group-real-prefix from-newsgroup)))
4646          (xref-hashtb (gnus-make-hashtable))
4647          start group entry number xrefs header)
4648     (while headers
4649       (setq header (pop headers))
4650       (when (and (setq xrefs (mail-header-xref header))
4651                  (not (memq (setq number (mail-header-number header))
4652                             unreads)))
4653         (setq start 0)
4654         (while (string-match "\\([^ ]+\\)[:/]\\([0-9]+\\)" xrefs start)
4655           (setq start (match-end 0))
4656           (setq group (if prefix
4657                           (concat prefix (substring xrefs (match-beginning 1)
4658                                                     (match-end 1)))
4659                         (substring xrefs (match-beginning 1) (match-end 1))))
4660           (setq number
4661                 (string-to-int (substring xrefs (match-beginning 2)
4662                                           (match-end 2))))
4663           (if (setq entry (gnus-gethash group xref-hashtb))
4664               (setcdr entry (cons number (cdr entry)))
4665             (gnus-sethash group (cons number nil) xref-hashtb)))))
4666     (and start xref-hashtb)))
4667
4668 (defun gnus-mark-xrefs-as-read (from-newsgroup headers unreads)
4669   "Look through all the headers and mark the Xrefs as read."
4670   (let ((virtual (gnus-virtual-group-p from-newsgroup))
4671         name entry info xref-hashtb idlist method nth4)
4672     (save-excursion
4673       (set-buffer gnus-group-buffer)
4674       (when (setq xref-hashtb
4675                   (gnus-create-xref-hashtb from-newsgroup headers unreads))
4676         (mapatoms
4677          (lambda (group)
4678            (unless (string= from-newsgroup (setq name (symbol-name group)))
4679              (setq idlist (symbol-value group))
4680              ;; Dead groups are not updated.
4681              (and (prog1
4682                       (setq entry (gnus-gethash name gnus-newsrc-hashtb)
4683                             info (nth 2 entry))
4684                     (when (stringp (setq nth4 (gnus-info-method info)))
4685                       (setq nth4 (gnus-server-to-method nth4))))
4686                   ;; Only do the xrefs if the group has the same
4687                   ;; select method as the group we have just read.
4688                   (or (gnus-methods-equal-p
4689                        nth4 (gnus-find-method-for-group from-newsgroup))
4690                       virtual
4691                       (equal nth4 (setq method (gnus-find-method-for-group
4692                                                 from-newsgroup)))
4693                       (and (equal (car nth4) (car method))
4694                            (equal (nth 1 nth4) (nth 1 method))))
4695                   gnus-use-cross-reference
4696                   (or (not (eq gnus-use-cross-reference t))
4697                       virtual
4698                       ;; Only do cross-references on subscribed
4699                       ;; groups, if that is what is wanted.
4700                       (<= (gnus-info-level info) gnus-level-subscribed))
4701                   (gnus-group-make-articles-read name idlist))))
4702          xref-hashtb)))))
4703
4704 (defun gnus-compute-read-articles (group articles)
4705   (let* ((entry (gnus-gethash group gnus-newsrc-hashtb))
4706          (info (nth 2 entry))
4707          (active (gnus-active group))
4708          ninfo)
4709     (when entry
4710       ;; First peel off all invalid article numbers.
4711       (when active
4712         (let ((ids articles)
4713               id first)
4714           (while (setq id (pop ids))
4715             (when (and first (> id (cdr active)))
4716               ;; We'll end up in this situation in one particular
4717               ;; obscure situation.  If you re-scan a group and get
4718               ;; a new article that is cross-posted to a different
4719               ;; group that has not been re-scanned, you might get
4720               ;; crossposted article that has a higher number than
4721               ;; Gnus believes possible.  So we re-activate this
4722               ;; group as well.  This might mean doing the
4723               ;; crossposting thingy will *increase* the number
4724               ;; of articles in some groups.  Tsk, tsk.
4725               (setq active (or (gnus-activate-group group) active)))
4726             (when (or (> id (cdr active))
4727                       (< id (car active)))
4728               (setq articles (delq id articles))))))
4729       ;; If the read list is nil, we init it.
4730       (if (and active
4731                (null (gnus-info-read info))
4732                (> (car active) 1))
4733           (setq ninfo (cons 1 (1- (car active))))
4734         (setq ninfo (gnus-info-read info)))
4735       ;; Then we add the read articles to the range.
4736       (gnus-add-to-range
4737        ninfo (setq articles (sort articles '<))))))
4738
4739 (defun gnus-group-make-articles-read (group articles)
4740   "Update the info of GROUP to say that ARTICLES are read."
4741   (let* ((num 0)
4742          (entry (gnus-gethash group gnus-newsrc-hashtb))
4743          (info (nth 2 entry))
4744          (active (gnus-active group))
4745          range)
4746     (when entry
4747       (setq range (gnus-compute-read-articles group articles))
4748       (save-excursion
4749         (set-buffer gnus-group-buffer)
4750         (gnus-undo-register
4751           `(progn
4752              (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
4753              (gnus-info-set-read ',info ',(gnus-info-read info))
4754              (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
4755              (gnus-group-update-group ,group t))))
4756       ;; Add the read articles to the range.
4757       (gnus-info-set-read info range)
4758       ;; Then we have to re-compute how many unread
4759       ;; articles there are in this group.
4760       (when active
4761         (cond
4762          ((not range)
4763           (setq num (- (1+ (cdr active)) (car active))))
4764          ((not (listp (cdr range)))
4765           (setq num (- (cdr active) (- (1+ (cdr range))
4766                                        (car range)))))
4767          (t
4768           (while range
4769             (if (numberp (car range))
4770                 (setq num (1+ num))
4771               (setq num (+ num (- (1+ (cdar range)) (caar range)))))
4772             (setq range (cdr range)))
4773           (setq num (- (cdr active) num))))
4774         ;; Update the number of unread articles.
4775         (setcar entry num)
4776         ;; Update the group buffer.
4777         (gnus-group-update-group group t)))))
4778
4779 (defvar gnus-newsgroup-none-id 0)
4780
4781 (defun gnus-get-newsgroup-headers (&optional dependencies force-new)
4782   (let ((cur nntp-server-buffer)
4783         (dependencies
4784          (or dependencies
4785              (save-excursion (set-buffer gnus-summary-buffer)
4786                              gnus-newsgroup-dependencies)))
4787         headers id end ref
4788         (mail-parse-charset gnus-newsgroup-charset)
4789         (mail-parse-ignored-charsets
4790          (save-excursion (condition-case nil
4791                              (set-buffer gnus-summary-buffer)
4792                            (error))
4793                          gnus-newsgroup-ignored-charsets)))
4794     (save-excursion
4795       (set-buffer nntp-server-buffer)
4796       ;; Translate all TAB characters into SPACE characters.
4797       (subst-char-in-region (point-min) (point-max) ?\t ?  t)
4798       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
4799       (gnus-run-hooks 'gnus-parse-headers-hook)
4800       (let ((case-fold-search t)
4801             in-reply-to header p lines chars)
4802         (goto-char (point-min))
4803         ;; Search to the beginning of the next header.  Error messages
4804         ;; do not begin with 2 or 3.
4805         (while (re-search-forward "^[23][0-9]+ " nil t)
4806           (setq id nil
4807                 ref nil)
4808           ;; This implementation of this function, with nine
4809           ;; search-forwards instead of the one re-search-forward and
4810           ;; a case (which basically was the old function) is actually
4811           ;; about twice as fast, even though it looks messier.  You
4812           ;; can't have everything, I guess.  Speed and elegance
4813           ;; doesn't always go hand in hand.
4814           (setq
4815            header
4816            (vector
4817             ;; Number.
4818             (prog1
4819                 (read cur)
4820               (end-of-line)
4821               (setq p (point))
4822               (narrow-to-region (point)
4823                                 (or (and (search-forward "\n.\n" nil t)
4824                                          (- (point) 2))
4825                                     (point))))
4826             ;; Subject.
4827             (progn
4828               (goto-char p)
4829               (if (search-forward "\nsubject: " nil t)
4830                   (funcall gnus-decode-encoded-word-function
4831                            (nnheader-header-value))
4832                 "(none)"))
4833             ;; From.
4834             (progn
4835               (goto-char p)
4836               (if (or (search-forward "\nfrom: " nil t)
4837                       (search-forward "\nfrom:" nil t))
4838                   (funcall gnus-decode-encoded-word-function
4839                            (nnheader-header-value))
4840                 "(nobody)"))
4841             ;; Date.
4842             (progn
4843               (goto-char p)
4844               (if (search-forward "\ndate: " nil t)
4845                   (nnheader-header-value) ""))
4846             ;; Message-ID.
4847             (progn
4848               (goto-char p)
4849               (setq id (if (re-search-forward
4850                             "^message-id: *\\(<[^\n\t> ]+>\\)" nil t)
4851                            ;; We do it this way to make sure the Message-ID
4852                            ;; is (somewhat) syntactically valid.
4853                            (buffer-substring (match-beginning 1)
4854                                              (match-end 1))
4855                          ;; If there was no message-id, we just fake one
4856                          ;; to make subsequent routines simpler.
4857                          (nnheader-generate-fake-message-id))))
4858             ;; References.
4859             (progn
4860               (goto-char p)
4861               (if (search-forward "\nreferences: " nil t)
4862                   (progn
4863                     (setq end (point))
4864                     (prog1
4865                         (nnheader-header-value)
4866                       (setq ref
4867                             (buffer-substring
4868                              (progn
4869                                (end-of-line)
4870                                (search-backward ">" end t)
4871                                (1+ (point)))
4872                              (progn
4873                                (search-backward "<" end t)
4874                                (point))))))
4875                 ;; Get the references from the in-reply-to header if there
4876                 ;; were no references and the in-reply-to header looks
4877                 ;; promising.
4878                 (if (and (search-forward "\nin-reply-to: " nil t)
4879                          (setq in-reply-to (nnheader-header-value))
4880                          (string-match "<[^>]+>" in-reply-to))
4881                     (let (ref2)
4882                       (setq ref (substring in-reply-to (match-beginning 0)
4883                                            (match-end 0)))
4884                       (while (string-match "<[^>]+>" in-reply-to (match-end 0))
4885                         (setq ref2 (substring in-reply-to (match-beginning 0)
4886                                               (match-end 0)))
4887                         (when (> (length ref2) (length ref))
4888                           (setq ref ref2)))
4889                       ref)
4890                   (setq ref nil))))
4891             ;; Chars.
4892             (progn
4893               (goto-char p)
4894               (if (search-forward "\nchars: " nil t)
4895                   (if (numberp (setq chars (ignore-errors (read cur))))
4896                       chars 0)
4897                 0))
4898             ;; Lines.
4899             (progn
4900               (goto-char p)
4901               (if (search-forward "\nlines: " nil t)
4902                   (if (numberp (setq lines (ignore-errors (read cur))))
4903                       lines 0)
4904                 0))
4905             ;; Xref.
4906             (progn
4907               (goto-char p)
4908               (and (search-forward "\nxref: " nil t)
4909                    (nnheader-header-value)))
4910             ;; Extra.
4911             (when gnus-extra-headers
4912               (let ((extra gnus-extra-headers)
4913                     out)
4914                 (while extra
4915                   (goto-char p)
4916                   (when (search-forward
4917                          (concat "\n" (symbol-name (car extra)) ": ") nil t)
4918                     (push (cons (car extra) (nnheader-header-value))
4919                           out))
4920                   (pop extra))
4921                 out))))
4922           (when (equal id ref)
4923             (setq ref nil))
4924
4925           (when gnus-alter-header-function
4926             (funcall gnus-alter-header-function header)
4927             (setq id (mail-header-id header)
4928                   ref (gnus-parent-id (mail-header-references header))))
4929
4930           (when (setq header
4931                       (gnus-dependencies-add-header
4932                        header dependencies force-new))
4933             (push header headers))
4934           (goto-char (point-max))
4935           (widen))
4936         (nreverse headers)))))
4937
4938 ;; Goes through the xover lines and returns a list of vectors
4939 (defun gnus-get-newsgroup-headers-xover (sequence &optional
4940                                                   force-new dependencies
4941                                                   group also-fetch-heads)
4942   "Parse the news overview data in the server buffer.
4943 Return a list of headers that match SEQUENCE (see
4944 `nntp-retrieve-headers')."
4945   ;; Get the Xref when the users reads the articles since most/some
4946   ;; NNTP servers do not include Xrefs when using XOVER.
4947   (setq gnus-article-internal-prepare-hook '(gnus-article-get-xrefs))
4948   (let ((mail-parse-charset gnus-newsgroup-charset)
4949         (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets)
4950         (cur nntp-server-buffer)
4951         (dependencies (or dependencies gnus-newsgroup-dependencies))
4952         number headers header)
4953     (save-excursion
4954       (set-buffer nntp-server-buffer)
4955       (subst-char-in-region (point-min) (point-max) ?\r ?  t)
4956       ;; Allow the user to mangle the headers before parsing them.
4957       (gnus-run-hooks 'gnus-parse-headers-hook)
4958       (goto-char (point-min))
4959       (while (not (eobp))
4960         (condition-case ()
4961             (while (and sequence (not (eobp)))
4962               (setq number (read cur))
4963               (while (and sequence
4964                           (< (car sequence) number))
4965                 (setq sequence (cdr sequence)))
4966               (and sequence
4967                    (eq number (car sequence))
4968                    (progn
4969                      (setq sequence (cdr sequence))
4970                      (setq header (inline
4971                                     (gnus-nov-parse-line
4972                                      number dependencies force-new))))
4973                    (push header headers))
4974               (forward-line 1))
4975           (error
4976            (gnus-error 4 "Strange nov line (%d)"
4977                        (count-lines (point-min) (point)))))
4978         (forward-line 1))
4979       ;; A common bug in inn is that if you have posted an article and
4980       ;; then retrieves the active file, it will answer correctly --
4981       ;; the new article is included.  However, a NOV entry for the
4982       ;; article may not have been generated yet, so this may fail.
4983       ;; We work around this problem by retrieving the last few
4984       ;; headers using HEAD.
4985       (if (or (not also-fetch-heads)
4986               (not sequence))
4987           ;; We (probably) got all the headers.
4988           (nreverse headers)
4989         (let ((gnus-nov-is-evil t))
4990           (nconc
4991            (nreverse headers)
4992            (when (gnus-retrieve-headers sequence group)
4993              (gnus-get-newsgroup-headers))))))))
4994
4995 (defun gnus-article-get-xrefs ()
4996   "Fill in the Xref value in `gnus-current-headers', if necessary.
4997 This is meant to be called in `gnus-article-internal-prepare-hook'."
4998   (let ((headers (save-excursion (set-buffer gnus-summary-buffer)
4999                                  gnus-current-headers)))
5000     (or (not gnus-use-cross-reference)
5001         (not headers)
5002         (and (mail-header-xref headers)
5003              (not (string= (mail-header-xref headers) "")))
5004         (let ((case-fold-search t)
5005               xref)
5006           (save-restriction
5007             (nnheader-narrow-to-headers)
5008             (goto-char (point-min))
5009             (when (or (and (not (eobp))
5010                            (eq (downcase (char-after)) ?x)
5011                            (looking-at "Xref:"))
5012                       (search-forward "\nXref:" nil t))
5013               (goto-char (1+ (match-end 0)))
5014               (setq xref (buffer-substring (point)
5015                                            (progn (end-of-line) (point))))
5016               (mail-header-set-xref headers xref)))))))
5017
5018 (defun gnus-summary-insert-subject (id &optional old-header use-old-header)
5019   "Find article ID and insert the summary line for that article.
5020 OLD-HEADER can either be a header or a line number to insert
5021 the subject line on."
5022   (let* ((line (and (numberp old-header) old-header))
5023          (old-header (and (vectorp old-header) old-header))
5024          (header (cond ((and old-header use-old-header)
5025                         old-header)
5026                        ((and (numberp id)
5027                              (gnus-number-to-header id))
5028                         (gnus-number-to-header id))
5029                        (t
5030                         (gnus-read-header id))))
5031          (number (and (numberp id) id))
5032          d)
5033     (when header
5034       ;; Rebuild the thread that this article is part of and go to the
5035       ;; article we have fetched.
5036       (when (and (not gnus-show-threads)
5037                  old-header)
5038         (when (and number
5039                    (setq d (gnus-data-find (mail-header-number old-header))))
5040           (goto-char (gnus-data-pos d))
5041           (gnus-data-remove
5042            number
5043            (- (gnus-point-at-bol)
5044               (prog1
5045                   (1+ (gnus-point-at-eol))
5046                 (gnus-delete-line))))))
5047       (when old-header
5048         (mail-header-set-number header (mail-header-number old-header)))
5049       (setq gnus-newsgroup-sparse
5050             (delq (setq number (mail-header-number header))
5051                   gnus-newsgroup-sparse))
5052       (setq gnus-newsgroup-ancient (delq number gnus-newsgroup-ancient))
5053       (push number gnus-newsgroup-limit)
5054       (gnus-rebuild-thread (mail-header-id header) line)
5055       (gnus-summary-goto-subject number nil t))
5056     (when (and (numberp number)
5057                (> number 0))
5058       ;; We have to update the boundaries even if we can't fetch the
5059       ;; article if ID is a number -- so that the next `P' or `N'
5060       ;; command will fetch the previous (or next) article even
5061       ;; if the one we tried to fetch this time has been canceled.
5062       (when (> number gnus-newsgroup-end)
5063         (setq gnus-newsgroup-end number))
5064       (when (< number gnus-newsgroup-begin)
5065         (setq gnus-newsgroup-begin number))
5066       (setq gnus-newsgroup-unselected
5067             (delq number gnus-newsgroup-unselected)))
5068     ;; Report back a success?
5069     (and header (mail-header-number header))))
5070
5071 ;;; Process/prefix in the summary buffer
5072
5073 (defun gnus-summary-work-articles (n)
5074   "Return a list of articles to be worked upon.
5075 The prefix argument, the list of process marked articles, and the
5076 current article will be taken into consideration."
5077   (save-excursion
5078     (set-buffer gnus-summary-buffer)
5079     (cond
5080      (n
5081       ;; A numerical prefix has been given.
5082       (setq n (prefix-numeric-value n))
5083       (let ((backward (< n 0))
5084             (n (abs (prefix-numeric-value n)))
5085             articles article)
5086         (save-excursion
5087           (while
5088               (and (> n 0)
5089                    (push (setq article (gnus-summary-article-number))
5090                          articles)
5091                    (if backward
5092                        (gnus-summary-find-prev nil article)
5093                      (gnus-summary-find-next nil article)))
5094             (decf n)))
5095         (nreverse articles)))
5096      ((and (gnus-region-active-p) (mark))
5097       (message "region active")
5098       ;; Work on the region between point and mark.
5099       (let ((max (max (point) (mark)))
5100             articles article)
5101         (save-excursion
5102           (goto-char (min (min (point) (mark))))
5103           (while
5104               (and
5105                (push (setq article (gnus-summary-article-number)) articles)
5106                (gnus-summary-find-next nil article)
5107                (< (point) max)))
5108           (nreverse articles))))
5109      (gnus-newsgroup-processable
5110       ;; There are process-marked articles present.
5111       ;; Save current state.
5112       (gnus-summary-save-process-mark)
5113       ;; Return the list.
5114       (reverse gnus-newsgroup-processable))
5115      (t
5116       ;; Just return the current article.
5117       (list (gnus-summary-article-number))))))
5118
5119 (defmacro gnus-summary-iterate (arg &rest forms)
5120   "Iterate over the process/prefixed articles and do FORMS.
5121 ARG is the interactive prefix given to the command.  FORMS will be
5122 executed with point over the summary line of the articles."
5123   (let ((articles (make-symbol "gnus-summary-iterate-articles")))
5124     `(let ((,articles (gnus-summary-work-articles ,arg)))
5125        (while ,articles
5126          (gnus-summary-goto-subject (car ,articles))
5127          ,@forms
5128          (pop ,articles)))))
5129
5130 (put 'gnus-summary-iterate 'lisp-indent-function 1)
5131 (put 'gnus-summary-iterate 'edebug-form-spec '(form body))
5132
5133 (defun gnus-summary-save-process-mark ()
5134   "Push the current set of process marked articles on the stack."
5135   (interactive)
5136   (push (copy-sequence gnus-newsgroup-processable)
5137         gnus-newsgroup-process-stack))
5138
5139 (defun gnus-summary-kill-process-mark ()
5140   "Push the current set of process marked articles on the stack and unmark."
5141   (interactive)
5142   (gnus-summary-save-process-mark)
5143   (gnus-summary-unmark-all-processable))
5144
5145 (defun gnus-summary-yank-process-mark ()
5146   "Pop the last process mark state off the stack and restore it."
5147   (interactive)
5148   (unless gnus-newsgroup-process-stack
5149     (error "Empty mark stack"))
5150   (gnus-summary-process-mark-set (pop gnus-newsgroup-process-stack)))
5151
5152 (defun gnus-summary-process-mark-set (set)
5153   "Make SET into the current process marked articles."
5154   (gnus-summary-unmark-all-processable)
5155   (while set
5156     (gnus-summary-set-process-mark (pop set))))
5157
5158 ;;; Searching and stuff
5159
5160 (defun gnus-summary-search-group (&optional backward use-level)
5161   "Search for next unread newsgroup.
5162 If optional argument BACKWARD is non-nil, search backward instead."
5163   (save-excursion
5164     (set-buffer gnus-group-buffer)
5165     (when (gnus-group-search-forward
5166            backward nil (if use-level (gnus-group-group-level) nil))
5167       (gnus-group-group-name))))
5168
5169 (defun gnus-summary-best-group (&optional exclude-group)
5170   "Find the name of the best unread group.
5171 If EXCLUDE-GROUP, do not go to this group."
5172   (save-excursion
5173     (set-buffer gnus-group-buffer)
5174     (save-excursion
5175       (gnus-group-best-unread-group exclude-group))))
5176
5177 (defun gnus-summary-find-next (&optional unread article backward undownloaded)
5178   (if backward (gnus-summary-find-prev)
5179     (let* ((dummy (gnus-summary-article-intangible-p))
5180            (article (or article (gnus-summary-article-number)))
5181            (arts (gnus-data-find-list article))
5182            result)
5183       (when (and (not dummy)
5184                  (or (not gnus-summary-check-current)
5185                      (not unread)
5186                      (not (gnus-data-unread-p (car arts)))))
5187         (setq arts (cdr arts)))
5188       (when (setq result
5189                   (if unread
5190                       (progn
5191                         (while arts
5192                           (when (or (and undownloaded
5193                                          (eq gnus-undownloaded-mark
5194                                              (gnus-data-mark (car arts))))
5195                                     (gnus-data-unread-p (car arts)))
5196                             (setq result (car arts)
5197                                   arts nil))
5198                           (setq arts (cdr arts)))
5199                         result)
5200                     (car arts)))
5201         (goto-char (gnus-data-pos result))
5202         (gnus-data-number result)))))
5203
5204 (defun gnus-summary-find-prev (&optional unread article)
5205   (let* ((eobp (eobp))
5206          (article (or article (gnus-summary-article-number)))
5207          (arts (gnus-data-find-list article (gnus-data-list 'rev)))
5208          result)
5209     (when (and (not eobp)
5210                (or (not gnus-summary-check-current)
5211                    (not unread)
5212                    (not (gnus-data-unread-p (car arts)))))
5213       (setq arts (cdr arts)))
5214     (when (setq result
5215                 (if unread
5216                     (progn
5217                       (while arts
5218                         (when (gnus-data-unread-p (car arts))
5219                           (setq result (car arts)
5220                                 arts nil))
5221                         (setq arts (cdr arts)))
5222                       result)
5223                   (car arts)))
5224       (goto-char (gnus-data-pos result))
5225       (gnus-data-number result))))
5226
5227 (defun gnus-summary-find-subject (subject &optional unread backward article)
5228   (let* ((simp-subject (gnus-simplify-subject-fully subject))
5229          (article (or article (gnus-summary-article-number)))
5230          (articles (gnus-data-list backward))
5231          (arts (gnus-data-find-list article articles))
5232          result)
5233     (when (or (not gnus-summary-check-current)
5234               (not unread)
5235               (not (gnus-data-unread-p (car arts))))
5236       (setq arts (cdr arts)))
5237     (while arts
5238       (and (or (not unread)
5239                (gnus-data-unread-p (car arts)))
5240            (vectorp (gnus-data-header (car arts)))
5241            (gnus-subject-equal
5242             simp-subject (mail-header-subject (gnus-data-header (car arts))) t)
5243            (setq result (car arts)
5244                  arts nil))
5245       (setq arts (cdr arts)))
5246     (and result
5247          (goto-char (gnus-data-pos result))
5248          (gnus-data-number result))))
5249
5250 (defun gnus-summary-search-forward (&optional unread subject backward)
5251   "Search forward for an article.
5252 If UNREAD, look for unread articles.  If SUBJECT, look for
5253 articles with that subject.  If BACKWARD, search backward instead."
5254   (cond (subject (gnus-summary-find-subject subject unread backward))
5255         (backward (gnus-summary-find-prev unread))
5256         (t (gnus-summary-find-next unread))))
5257
5258 (defun gnus-recenter (&optional n)
5259   "Center point in window and redisplay frame.
5260 Also do horizontal recentering."
5261   (interactive "P")
5262   (when (and gnus-auto-center-summary
5263              (not (eq gnus-auto-center-summary 'vertical)))
5264     (gnus-horizontal-recenter))
5265   (recenter n))
5266
5267 (defun gnus-summary-recenter ()
5268   "Center point in the summary window.
5269 If `gnus-auto-center-summary' is nil, or the article buffer isn't
5270 displayed, no centering will be performed."
5271   ;; Suggested by earle@mahendo.JPL.NASA.GOV (Greg Earle).
5272   ;; Recenter only when requested.  Suggested by popovich@park.cs.columbia.edu.
5273   (interactive)
5274   (let* ((top (cond ((< (window-height) 4) 0)
5275                     ((< (window-height) 7) 1)
5276                     (t (if (numberp gnus-auto-center-summary)
5277                            gnus-auto-center-summary
5278                          2))))
5279          (height (1- (window-height)))
5280          (bottom (save-excursion (goto-char (point-max))
5281                                  (forward-line (- height))
5282                                  (point)))
5283          (window (get-buffer-window (current-buffer))))
5284     ;; The user has to want it.
5285     (when gnus-auto-center-summary
5286       (when (get-buffer-window gnus-article-buffer)
5287         ;; Only do recentering when the article buffer is displayed,
5288         ;; Set the window start to either `bottom', which is the biggest
5289         ;; possible valid number, or the second line from the top,
5290         ;; whichever is the least.
5291         (let ((top-pos (save-excursion (forward-line (- top)) (point))))
5292           (if (> bottom top-pos)
5293               ;; Keep the second line from the top visible
5294               (set-window-start window top-pos t)
5295             ;; Try to keep the bottom line visible; if it's partially
5296             ;; obscured, either scroll one more line to make it fully
5297             ;; visible, or revert to using TOP-POS.
5298             (save-excursion
5299               (goto-char (point-max))
5300               (forward-line -1)
5301               (let ((last-line-start (point)))
5302                 (goto-char bottom)
5303                 (set-window-start window (point) t)
5304                 (when (not (pos-visible-in-window-p last-line-start window))
5305                   (forward-line 1)
5306                   (set-window-start window (min (point) top-pos) t)))))))
5307       ;; Do horizontal recentering while we're at it.
5308       (when (and (get-buffer-window (current-buffer) t)
5309                  (not (eq gnus-auto-center-summary 'vertical)))
5310         (let ((selected (selected-window)))
5311           (select-window (get-buffer-window (current-buffer) t))
5312           (gnus-summary-position-point)
5313           (gnus-horizontal-recenter)
5314           (select-window selected))))))
5315
5316 (defun gnus-summary-jump-to-group (newsgroup)
5317   "Move point to NEWSGROUP in group mode buffer."
5318   ;; Keep update point of group mode buffer if visible.
5319   (if (eq (current-buffer) (get-buffer gnus-group-buffer))
5320       (save-window-excursion
5321         ;; Take care of tree window mode.
5322         (when (get-buffer-window gnus-group-buffer)
5323           (pop-to-buffer gnus-group-buffer))
5324         (gnus-group-jump-to-group newsgroup))
5325     (save-excursion
5326       ;; Take care of tree window mode.
5327       (if (get-buffer-window gnus-group-buffer)
5328           (pop-to-buffer gnus-group-buffer)
5329         (set-buffer gnus-group-buffer))
5330       (gnus-group-jump-to-group newsgroup))))
5331
5332 ;; This function returns a list of article numbers based on the
5333 ;; difference between the ranges of read articles in this group and
5334 ;; the range of active articles.
5335 (defun gnus-list-of-unread-articles (group)
5336   (let* ((read (gnus-info-read (gnus-get-info group)))
5337          (active (or (gnus-active group) (gnus-activate-group group)))
5338          (last (cdr active))
5339          first nlast unread)
5340     ;; If none are read, then all are unread.
5341     (if (not read)
5342         (setq first (car active))
5343       ;; If the range of read articles is a single range, then the
5344       ;; first unread article is the article after the last read
5345       ;; article.  Sounds logical, doesn't it?
5346       (if (and (not (listp (cdr read)))
5347                (or (< (car read) (car active))
5348                    (progn (setq read (list read))
5349                           nil)))
5350           (setq first (max (car active) (1+ (cdr read))))
5351         ;; `read' is a list of ranges.
5352         (when (/= (setq nlast (or (and (numberp (car read)) (car read))
5353                                   (caar read)))
5354                   1)
5355           (setq first (car active)))
5356         (while read
5357           (when first
5358             (while (< first nlast)
5359               (push first unread)
5360               (setq first (1+ first))))
5361           (setq first (1+ (if (atom (car read)) (car read) (cdar read))))
5362           (setq nlast (if (atom (cadr read)) (cadr read) (caadr read)))
5363           (setq read (cdr read)))))
5364     ;; And add the last unread articles.
5365     (while (<= first last)
5366       (push first unread)
5367       (setq first (1+ first)))
5368     ;; Return the list of unread articles.
5369     (delq 0 (nreverse unread))))
5370
5371 (defun gnus-list-of-read-articles (group)
5372   "Return a list of unread, unticked and non-dormant articles."
5373   (let* ((info (gnus-get-info group))
5374          (marked (gnus-info-marks info))
5375          (active (gnus-active group)))
5376     (and info active
5377          (gnus-set-difference
5378           (gnus-sorted-complement
5379            (gnus-uncompress-range active)
5380            (gnus-list-of-unread-articles group))
5381           (append
5382            (gnus-uncompress-range (cdr (assq 'dormant marked)))
5383            (gnus-uncompress-range (cdr (assq 'tick marked))))))))
5384
5385 ;; Various summary commands
5386
5387 (defun gnus-summary-select-article-buffer ()
5388   "Reconfigure windows to show article buffer."
5389   (interactive)
5390   (if (not (gnus-buffer-live-p gnus-article-buffer))
5391       (error "There is no article buffer for this summary buffer")
5392     (gnus-configure-windows 'article)
5393     (select-window (get-buffer-window gnus-article-buffer))))
5394
5395 (defun gnus-summary-universal-argument (arg)
5396   "Perform any operation on all articles that are process/prefixed."
5397   (interactive "P")
5398   (let ((articles (gnus-summary-work-articles arg))
5399         func article)
5400     (if (eq
5401          (setq
5402           func
5403           (key-binding
5404            (read-key-sequence
5405             (substitute-command-keys
5406              "\\<gnus-summary-mode-map>\\[gnus-summary-universal-argument]"))))
5407          'undefined)
5408         (gnus-error 1 "Undefined key")
5409       (save-excursion
5410         (while articles
5411           (gnus-summary-goto-subject (setq article (pop articles)))
5412           (let (gnus-newsgroup-processable)
5413             (command-execute func))
5414           (gnus-summary-remove-process-mark article)))))
5415   (gnus-summary-position-point))
5416
5417 (defun gnus-summary-toggle-truncation (&optional arg)
5418   "Toggle truncation of summary lines.
5419 With arg, turn line truncation on iff arg is positive."
5420   (interactive "P")
5421   (setq truncate-lines
5422         (if (null arg) (not truncate-lines)
5423           (> (prefix-numeric-value arg) 0)))
5424   (redraw-display))
5425
5426 (defun gnus-summary-reselect-current-group (&optional all rescan)
5427   "Exit and then reselect the current newsgroup.
5428 The prefix argument ALL means to select all articles."
5429   (interactive "P")
5430   (when (gnus-ephemeral-group-p gnus-newsgroup-name)
5431     (error "Ephemeral groups can't be reselected"))
5432   (let ((current-subject (gnus-summary-article-number))
5433         (group gnus-newsgroup-name))
5434     (setq gnus-newsgroup-begin nil)
5435     (gnus-summary-exit)
5436     ;; We have to adjust the point of group mode buffer because
5437     ;; point was moved to the next unread newsgroup by exiting.
5438     (gnus-summary-jump-to-group group)
5439     (when rescan
5440       (save-excursion
5441         (gnus-group-get-new-news-this-group 1)))
5442     (gnus-group-read-group all t)
5443     (gnus-summary-goto-subject current-subject nil t)))
5444
5445 (defun gnus-summary-rescan-group (&optional all)
5446   "Exit the newsgroup, ask for new articles, and select the newsgroup."
5447   (interactive "P")
5448   (gnus-summary-reselect-current-group all t))
5449
5450 (defun gnus-summary-update-info (&optional non-destructive)
5451   (save-excursion
5452     (let ((group gnus-newsgroup-name))
5453       (when group
5454         (when gnus-newsgroup-kill-headers
5455           (setq gnus-newsgroup-killed
5456                 (gnus-compress-sequence
5457                  (nconc
5458                   (gnus-set-sorted-intersection
5459                    (gnus-uncompress-range gnus-newsgroup-killed)
5460                    (setq gnus-newsgroup-unselected
5461                          (sort gnus-newsgroup-unselected '<)))
5462                   (setq gnus-newsgroup-unreads
5463                         (sort gnus-newsgroup-unreads '<)))
5464                  t)))
5465         (unless (listp (cdr gnus-newsgroup-killed))
5466           (setq gnus-newsgroup-killed (list gnus-newsgroup-killed)))
5467         (let ((headers gnus-newsgroup-headers))
5468           ;; Set the new ranges of read articles.
5469           (save-excursion
5470             (set-buffer gnus-group-buffer)
5471             (gnus-undo-force-boundary))
5472           (gnus-update-read-articles
5473            group (append gnus-newsgroup-unreads gnus-newsgroup-unselected))
5474           ;; Set the current article marks.
5475           (let ((gnus-newsgroup-scored
5476                  (if (and (not gnus-save-score)
5477                           (not non-destructive))
5478                      nil
5479                    gnus-newsgroup-scored)))
5480             (save-excursion
5481               (gnus-update-marks)))
5482           ;; Do the cross-ref thing.
5483           (when gnus-use-cross-reference
5484             (gnus-mark-xrefs-as-read group headers gnus-newsgroup-unreads))
5485           ;; Do not switch windows but change the buffer to work.
5486           (set-buffer gnus-group-buffer)
5487           (unless (gnus-ephemeral-group-p group)
5488             (gnus-group-update-group group)))))))
5489
5490 (defun gnus-summary-save-newsrc (&optional force)
5491   "Save the current number of read/marked articles in the dribble buffer.
5492 The dribble buffer will then be saved.
5493 If FORCE (the prefix), also save the .newsrc file(s)."
5494   (interactive "P")
5495   (gnus-summary-update-info t)
5496   (if force
5497       (gnus-save-newsrc-file)
5498     (gnus-dribble-save)))
5499
5500 (defun gnus-summary-exit (&optional temporary)
5501   "Exit reading current newsgroup, and then return to group selection mode.
5502 `gnus-exit-group-hook' is called with no arguments if that value is non-nil."
5503   (interactive)
5504   (gnus-set-global-variables)
5505   (when (gnus-buffer-live-p gnus-article-buffer)
5506     (save-excursion
5507       (set-buffer gnus-article-buffer)
5508       (mm-destroy-parts gnus-article-mime-handles)
5509       ;; Set it to nil for safety reason.
5510       (setq gnus-article-mime-handle-alist nil)
5511       (setq gnus-article-mime-handles nil)))
5512   (gnus-kill-save-kill-buffer)
5513   (gnus-async-halt-prefetch)
5514   (let* ((group gnus-newsgroup-name)
5515          (quit-config (gnus-group-quit-config gnus-newsgroup-name))
5516          (mode major-mode)
5517          (group-point nil)
5518          (buf (current-buffer)))
5519     (unless quit-config
5520       ;; Do adaptive scoring, and possibly save score files.
5521       (when gnus-newsgroup-adaptive
5522         (gnus-score-adaptive))
5523       (when gnus-use-scoring
5524         (gnus-score-save)))
5525     (gnus-run-hooks 'gnus-summary-prepare-exit-hook)
5526     ;; If we have several article buffers, we kill them at exit.
5527     (unless gnus-single-article-buffer
5528       (gnus-kill-buffer gnus-original-article-buffer)
5529       (setq gnus-article-current nil))
5530     (when gnus-use-cache
5531       (gnus-cache-possibly-remove-articles)
5532       (gnus-cache-save-buffers))
5533     (gnus-async-prefetch-remove-group group)
5534     (when gnus-suppress-duplicates
5535       (gnus-dup-enter-articles))
5536     (when gnus-use-trees
5537       (gnus-tree-close group))
5538     (when gnus-use-cache
5539       (gnus-cache-write-active))
5540     ;; Remove entries for this group.
5541     (nnmail-purge-split-history (gnus-group-real-name group))
5542     ;; Make all changes in this group permanent.
5543     (unless quit-config
5544       (gnus-run-hooks 'gnus-exit-group-hook)
5545       (gnus-summary-update-info))
5546     (gnus-close-group group)
5547     ;; Make sure where we were, and go to next newsgroup.
5548     (set-buffer gnus-group-buffer)
5549     (unless quit-config
5550       (gnus-group-jump-to-group group))
5551     (gnus-run-hooks 'gnus-summary-exit-hook)
5552     (unless (or quit-config
5553                 ;; If this group has disappeared from the summary
5554                 ;; buffer, don't skip forwards.
5555                 (not (string= group (gnus-group-group-name))))
5556       (gnus-group-next-unread-group 1))
5557     (setq group-point (point))
5558     (if temporary
5559         nil                             ;Nothing to do.
5560       ;; If we have several article buffers, we kill them at exit.
5561       (unless gnus-single-article-buffer
5562         (gnus-kill-buffer gnus-article-buffer)
5563         (gnus-kill-buffer gnus-original-article-buffer)
5564         (setq gnus-article-current nil))
5565       (set-buffer buf)
5566       (if (not gnus-kill-summary-on-exit)
5567           (gnus-deaden-summary)
5568         ;; We set all buffer-local variables to nil.  It is unclear why
5569         ;; this is needed, but if we don't, buffer-local variables are
5570         ;; not garbage-collected, it seems.  This would the lead to en
5571         ;; ever-growing Emacs.
5572         (gnus-summary-clear-local-variables)
5573         (when (get-buffer gnus-article-buffer)
5574           (bury-buffer gnus-article-buffer))
5575         ;; We clear the global counterparts of the buffer-local
5576         ;; variables as well, just to be on the safe side.
5577         (set-buffer gnus-group-buffer)
5578         (gnus-summary-clear-local-variables)
5579         ;; Return to group mode buffer.
5580         (when (eq mode 'gnus-summary-mode)
5581           (gnus-kill-buffer buf)))
5582       (setq gnus-current-select-method gnus-select-method)
5583       (pop-to-buffer gnus-group-buffer)
5584       (if (not quit-config)
5585           (progn
5586             (goto-char group-point)
5587             (gnus-configure-windows 'group 'force))
5588         (gnus-handle-ephemeral-exit quit-config))
5589       ;; Clear the current group name.
5590       (unless quit-config
5591         (setq gnus-newsgroup-name nil)))))
5592
5593 (defalias 'gnus-summary-quit 'gnus-summary-exit-no-update)
5594 (defun gnus-summary-exit-no-update (&optional no-questions)
5595   "Quit reading current newsgroup without updating read article info."
5596   (interactive)
5597   (let* ((group gnus-newsgroup-name)
5598          (quit-config (gnus-group-quit-config group)))
5599     (when (or no-questions
5600               gnus-expert-user
5601               (gnus-y-or-n-p "Discard changes to this group and exit? "))
5602       (gnus-async-halt-prefetch)
5603       (mapcar 'funcall
5604               (delq 'gnus-summary-expire-articles
5605                     (copy-sequence gnus-summary-prepare-exit-hook)))
5606       (when (gnus-buffer-live-p gnus-article-buffer)
5607         (save-excursion
5608           (set-buffer gnus-article-buffer)
5609           (mm-destroy-parts gnus-article-mime-handles)
5610           ;; Set it to nil for safety reason.
5611           (setq gnus-article-mime-handle-alist nil)
5612           (setq gnus-article-mime-handles nil)))
5613       ;; If we have several article buffers, we kill them at exit.
5614       (unless gnus-single-article-buffer
5615         (gnus-kill-buffer gnus-article-buffer)
5616         (gnus-kill-buffer gnus-original-article-buffer)
5617         (setq gnus-article-current nil))
5618       (if (not gnus-kill-summary-on-exit)
5619           (gnus-deaden-summary)
5620         (gnus-close-group group)
5621         (gnus-summary-clear-local-variables)
5622         (set-buffer gnus-group-buffer)
5623         (gnus-summary-clear-local-variables)
5624         (when (get-buffer gnus-summary-buffer)
5625           (kill-buffer gnus-summary-buffer)))
5626       (unless gnus-single-article-buffer
5627         (setq gnus-article-current nil))
5628       (when gnus-use-trees
5629         (gnus-tree-close group))
5630       (gnus-async-prefetch-remove-group group)
5631       (when (get-buffer gnus-article-buffer)
5632         (bury-buffer gnus-article-buffer))
5633       ;; Return to the group buffer.
5634       (gnus-configure-windows 'group 'force)
5635       ;; Clear the current group name.
5636       (setq gnus-newsgroup-name nil)
5637       (when (equal (gnus-group-group-name) group)
5638         (gnus-group-next-unread-group 1))
5639       (when quit-config
5640         (gnus-handle-ephemeral-exit quit-config)))))
5641
5642 (defun gnus-handle-ephemeral-exit (quit-config)
5643   "Handle movement when leaving an ephemeral group.
5644 The state which existed when entering the ephemeral is reset."
5645   (if (not (buffer-name (car quit-config)))
5646       (gnus-configure-windows 'group 'force)
5647     (set-buffer (car quit-config))
5648     (cond ((eq major-mode 'gnus-summary-mode)
5649            (gnus-set-global-variables))
5650           ((eq major-mode 'gnus-article-mode)
5651            (save-excursion
5652              ;; The `gnus-summary-buffer' variable may point
5653              ;; to the old summary buffer when using a single
5654              ;; article buffer.
5655              (unless (gnus-buffer-live-p gnus-summary-buffer)
5656                (set-buffer gnus-group-buffer))
5657              (set-buffer gnus-summary-buffer)
5658              (gnus-set-global-variables))))
5659     (if (or (eq (cdr quit-config) 'article)
5660             (eq (cdr quit-config) 'pick))
5661         (progn
5662           ;; The current article may be from the ephemeral group
5663           ;; thus it is best that we reload this article
5664           (gnus-summary-show-article)
5665           (if (and (boundp 'gnus-pick-mode) (symbol-value 'gnus-pick-mode))
5666               (gnus-configure-windows 'pick 'force)
5667             (gnus-configure-windows (cdr quit-config) 'force)))
5668       (gnus-configure-windows (cdr quit-config) 'force))
5669     (when (eq major-mode 'gnus-summary-mode)
5670       (gnus-summary-next-subject 1 nil t)
5671       (gnus-summary-recenter)
5672       (gnus-summary-position-point))))
5673
5674 ;;; Dead summaries.
5675
5676 (defvar gnus-dead-summary-mode-map nil)
5677
5678 (unless gnus-dead-summary-mode-map
5679   (setq gnus-dead-summary-mode-map (make-keymap))
5680   (suppress-keymap gnus-dead-summary-mode-map)
5681   (substitute-key-definition
5682    'undefined 'gnus-summary-wake-up-the-dead gnus-dead-summary-mode-map)
5683   (let ((keys '("\C-d" "\r" "\177" [delete])))
5684     (while keys
5685       (define-key gnus-dead-summary-mode-map
5686         (pop keys) 'gnus-summary-wake-up-the-dead))))
5687
5688 (defvar gnus-dead-summary-mode nil
5689   "Minor mode for Gnus summary buffers.")
5690
5691 (defun gnus-dead-summary-mode (&optional arg)
5692   "Minor mode for Gnus summary buffers."
5693   (interactive "P")
5694   (when (eq major-mode 'gnus-summary-mode)
5695     (make-local-variable 'gnus-dead-summary-mode)
5696     (setq gnus-dead-summary-mode
5697           (if (null arg) (not gnus-dead-summary-mode)
5698             (> (prefix-numeric-value arg) 0)))
5699     (when gnus-dead-summary-mode
5700       (gnus-add-minor-mode
5701        'gnus-dead-summary-mode " Dead" gnus-dead-summary-mode-map))))
5702
5703 (defun gnus-deaden-summary ()
5704   "Make the current summary buffer into a dead summary buffer."
5705   ;; Kill any previous dead summary buffer.
5706   (when (and gnus-dead-summary
5707              (buffer-name gnus-dead-summary))
5708     (save-excursion
5709       (set-buffer gnus-dead-summary)
5710       (when gnus-dead-summary-mode
5711         (kill-buffer (current-buffer)))))
5712   ;; Make this the current dead summary.
5713   (setq gnus-dead-summary (current-buffer))
5714   (gnus-dead-summary-mode 1)
5715   (let ((name (buffer-name)))
5716     (when (string-match "Summary" name)
5717       (rename-buffer
5718        (concat (substring name 0 (match-beginning 0)) "Dead "
5719                (substring name (match-beginning 0)))
5720        t)
5721       (bury-buffer))))
5722
5723 (defun gnus-kill-or-deaden-summary (buffer)
5724   "Kill or deaden the summary BUFFER."
5725   (save-excursion
5726     (when (and (buffer-name buffer)
5727                (not gnus-single-article-buffer))
5728       (save-excursion
5729         (set-buffer buffer)
5730         (gnus-kill-buffer gnus-article-buffer)
5731         (gnus-kill-buffer gnus-original-article-buffer)))
5732     (cond (gnus-kill-summary-on-exit
5733            (when (and gnus-use-trees
5734                       (gnus-buffer-exists-p buffer))
5735              (save-excursion
5736                (set-buffer buffer)
5737                (gnus-tree-close gnus-newsgroup-name)))
5738            (gnus-kill-buffer buffer))
5739           ((gnus-buffer-exists-p buffer)
5740            (save-excursion
5741              (set-buffer buffer)
5742              (gnus-deaden-summary))))))
5743
5744 (defun gnus-summary-wake-up-the-dead (&rest args)
5745   "Wake up the dead summary buffer."
5746   (interactive)
5747   (gnus-dead-summary-mode -1)
5748   (let ((name (buffer-name)))
5749     (when (string-match "Dead " name)
5750       (rename-buffer
5751        (concat (substring name 0 (match-beginning 0))
5752                (substring name (match-end 0)))
5753        t)))
5754   (gnus-message 3 "This dead summary is now alive again"))
5755
5756 ;; Suggested by Andrew Eskilsson <pi92ae@pt.hk-r.se>.
5757 (defun gnus-summary-fetch-faq (&optional faq-dir)
5758   "Fetch the FAQ for the current group.
5759 If FAQ-DIR (the prefix), prompt for a directory to search for the faq
5760 in."
5761   (interactive
5762    (list
5763     (when current-prefix-arg
5764       (completing-read
5765        "Faq dir: " (and (listp gnus-group-faq-directory)
5766                         (mapcar (lambda (file) (list file))
5767                                 gnus-group-faq-directory))))))
5768   (let (gnus-faq-buffer)
5769     (when (setq gnus-faq-buffer
5770                 (gnus-group-fetch-faq gnus-newsgroup-name faq-dir))
5771       (gnus-configure-windows 'summary-faq))))
5772
5773 ;; Suggested by Per Abrahamsen <amanda@iesd.auc.dk>.
5774 (defun gnus-summary-describe-group (&optional force)
5775   "Describe the current newsgroup."
5776   (interactive "P")
5777   (gnus-group-describe-group force gnus-newsgroup-name))
5778
5779 (defun gnus-summary-describe-briefly ()
5780   "Describe summary mode commands briefly."
5781   (interactive)
5782   (gnus-message 6 (substitute-command-keys "\\<gnus-summary-mode-map>\\[gnus-summary-next-page]:Select  \\[gnus-summary-next-unread-article]:Forward  \\[gnus-summary-prev-unread-article]:Backward  \\[gnus-summary-exit]:Exit  \\[gnus-info-find-node]:Run Info        \\[gnus-summary-describe-briefly]:This help")))
5783
5784 ;; Walking around group mode buffer from summary mode.
5785
5786 (defun gnus-summary-next-group (&optional no-article target-group backward)
5787   "Exit current newsgroup and then select next unread newsgroup.
5788 If prefix argument NO-ARTICLE is non-nil, no article is selected
5789 initially.  If NEXT-GROUP, go to this group.  If BACKWARD, go to
5790 previous group instead."
5791   (interactive "P")
5792   ;; Stop pre-fetching.
5793   (gnus-async-halt-prefetch)
5794   (let ((current-group gnus-newsgroup-name)
5795         (current-buffer (current-buffer))
5796         entered)
5797     ;; First we semi-exit this group to update Xrefs and all variables.
5798     ;; We can't do a real exit, because the window conf must remain
5799     ;; the same in case the user is prompted for info, and we don't
5800     ;; want the window conf to change before that...
5801     (gnus-summary-exit t)
5802     (while (not entered)
5803       ;; Then we find what group we are supposed to enter.
5804       (set-buffer gnus-group-buffer)
5805       (gnus-group-jump-to-group current-group)
5806       (setq target-group
5807             (or target-group
5808                 (if (eq gnus-keep-same-level 'best)
5809                     (gnus-summary-best-group gnus-newsgroup-name)
5810                   (gnus-summary-search-group backward gnus-keep-same-level))))
5811       (if (not target-group)
5812           ;; There are no further groups, so we return to the group
5813           ;; buffer.
5814           (progn
5815             (gnus-message 5 "Returning to the group buffer")
5816             (setq entered t)
5817             (when (gnus-buffer-live-p current-buffer)
5818               (set-buffer current-buffer)
5819               (gnus-summary-exit))
5820             (gnus-run-hooks 'gnus-group-no-more-groups-hook))
5821         ;; We try to enter the target group.
5822         (gnus-group-jump-to-group target-group)
5823         (let ((unreads (gnus-group-group-unread)))
5824           (if (and (or (eq t unreads)
5825                        (and unreads (not (zerop unreads))))
5826                    (gnus-summary-read-group
5827                     target-group nil no-article
5828                     (and (buffer-name current-buffer) current-buffer)
5829                     nil backward))
5830               (setq entered t)
5831             (setq current-group target-group
5832                   target-group nil)))))))
5833
5834 (defun gnus-summary-prev-group (&optional no-article)
5835   "Exit current newsgroup and then select previous unread newsgroup.
5836 If prefix argument NO-ARTICLE is non-nil, no article is selected initially."
5837   (interactive "P")
5838   (gnus-summary-next-group no-article nil t))
5839
5840 ;; Walking around summary lines.
5841
5842 (defun gnus-summary-first-subject (&optional unread undownloaded)
5843   "Go to the first unread subject.
5844 If UNREAD is non-nil, go to the first unread article.
5845 Returns the article selected or nil if there are no unread articles."
5846   (interactive "P")
5847   (prog1
5848       (cond
5849        ;; Empty summary.
5850        ((null gnus-newsgroup-data)
5851         (gnus-message 3 "No articles in the group")
5852         nil)
5853        ;; Pick the first article.
5854        ((not unread)
5855         (goto-char (gnus-data-pos (car gnus-newsgroup-data)))
5856         (gnus-data-number (car gnus-newsgroup-data)))
5857        ;; No unread articles.
5858        ((null gnus-newsgroup-unreads)
5859         (gnus-message 3 "No more unread articles")
5860         nil)
5861        ;; Find the first unread article.
5862        (t
5863         (let ((data gnus-newsgroup-data))
5864           (while (and data
5865                       (and (not (and undownloaded
5866                                      (eq gnus-undownloaded-mark
5867                                          (gnus-data-mark (car data)))))
5868                            (not (gnus-data-unread-p (car data)))))
5869             (setq data (cdr data)))
5870           (when data
5871             (goto-char (gnus-data-pos (car data)))
5872             (gnus-data-number (car data))))))
5873     (gnus-summary-position-point)))
5874
5875 (defun gnus-summary-next-subject (n &optional unread dont-display)
5876   "Go to next N'th summary line.
5877 If N is negative, go to the previous N'th subject line.
5878 If UNREAD is non-nil, only unread articles are selected.
5879 The difference between N and the actual number of steps taken is
5880 returned."
5881   (interactive "p")
5882   (let ((backward (< n 0))
5883         (n (abs n)))
5884     (while (and (> n 0)
5885                 (if backward
5886                     (gnus-summary-find-prev unread)
5887                   (gnus-summary-find-next unread)))
5888       (unless (zerop (setq n (1- n)))
5889         (gnus-summary-show-thread)))
5890     (when (/= 0 n)
5891       (gnus-message 7 "No more%s articles"
5892                     (if unread " unread" "")))
5893     (unless dont-display
5894       (gnus-summary-recenter)
5895       (gnus-summary-position-point))
5896     n))
5897
5898 (defun gnus-summary-next-unread-subject (n)
5899   "Go to next N'th unread summary line."
5900   (interactive "p")
5901   (gnus-summary-next-subject n t))
5902
5903 (defun gnus-summary-prev-subject (n &optional unread)
5904   "Go to previous N'th summary line.
5905 If optional argument UNREAD is non-nil, only unread article is selected."
5906   (interactive "p")
5907   (gnus-summary-next-subject (- n) unread))
5908
5909 (defun gnus-summary-prev-unread-subject (n)
5910   "Go to previous N'th unread summary line."
5911   (interactive "p")
5912   (gnus-summary-next-subject (- n) t))
5913
5914 (defun gnus-summary-goto-subject (article &optional force silent)
5915   "Go the subject line of ARTICLE.
5916 If FORCE, also allow jumping to articles not currently shown."
5917   (interactive "nArticle number: ")
5918   (let ((b (point))
5919         (data (gnus-data-find article)))
5920     ;; We read in the article if we have to.
5921     (and (not data)
5922          force
5923          (gnus-summary-insert-subject
5924           article
5925           (if (or (numberp force) (vectorp force)) force)
5926           t)
5927          (setq data (gnus-data-find article)))
5928     (goto-char b)
5929     (if (not data)
5930         (progn
5931           (unless silent
5932             (gnus-message 3 "Can't find article %d" article))
5933           nil)
5934       (goto-char (gnus-data-pos data))
5935       (gnus-summary-position-point)
5936       article)))
5937
5938 ;; Walking around summary lines with displaying articles.
5939
5940 (defun gnus-summary-expand-window (&optional arg)
5941   "Make the summary buffer take up the entire Emacs frame.
5942 Given a prefix, will force an `article' buffer configuration."
5943   (interactive "P")
5944   (if arg
5945       (gnus-configure-windows 'article 'force)
5946     (gnus-configure-windows 'summary 'force)))
5947
5948 (defun gnus-summary-display-article (article &optional all-header)
5949   "Display ARTICLE in article buffer."
5950   (when (gnus-buffer-live-p gnus-article-buffer)
5951     (with-current-buffer gnus-article-buffer
5952       (mm-enable-multibyte-mule4)))
5953   (gnus-set-global-variables)
5954   (if (null article)
5955       nil
5956     (prog1
5957         (if gnus-summary-display-article-function
5958             (funcall gnus-summary-display-article-function article all-header)
5959           (gnus-article-prepare article all-header))
5960       (gnus-run-hooks 'gnus-select-article-hook)
5961       (when (and gnus-current-article
5962                  (not (zerop gnus-current-article)))
5963         (gnus-summary-goto-subject gnus-current-article))
5964       (gnus-summary-recenter)
5965       (when (and gnus-use-trees gnus-show-threads)
5966         (gnus-possibly-generate-tree article)
5967         (gnus-highlight-selected-tree article))
5968       ;; Successfully display article.
5969       (gnus-article-set-window-start
5970        (cdr (assq article gnus-newsgroup-bookmarks))))))
5971
5972 (defun gnus-summary-select-article (&optional all-headers force pseudo article)
5973   "Select the current article.
5974 If ALL-HEADERS is non-nil, show all header fields.  If FORCE is
5975 non-nil, the article will be re-fetched even if it already present in
5976 the article buffer.  If PSEUDO is non-nil, pseudo-articles will also
5977 be displayed."
5978   ;; Make sure we are in the summary buffer to work around bbdb bug.
5979   (unless (eq major-mode 'gnus-summary-mode)
5980     (set-buffer gnus-summary-buffer))
5981   (let ((article (or article (gnus-summary-article-number)))
5982         (all-headers (not (not all-headers))) ;Must be t or nil.
5983         gnus-summary-display-article-function)
5984     (and (not pseudo)
5985          (gnus-summary-article-pseudo-p article)
5986          (error "This is a pseudo-article"))
5987     (save-excursion
5988       (set-buffer gnus-summary-buffer)
5989       (if (or (and gnus-single-article-buffer
5990                    (or (null gnus-current-article)
5991                        (null gnus-article-current)
5992                        (null (get-buffer gnus-article-buffer))
5993                        (not (eq article (cdr gnus-article-current)))
5994                        (not (equal (car gnus-article-current)
5995                                    gnus-newsgroup-name))))
5996               (and (not gnus-single-article-buffer)
5997                    (or (null gnus-current-article)
5998                        (not (eq gnus-current-article article))))
5999               force)
6000           ;; The requested article is different from the current article.
6001           (progn
6002             (gnus-summary-display-article article all-headers)
6003             (when (gnus-buffer-live-p gnus-article-buffer)
6004                (with-current-buffer gnus-article-buffer
6005                 (if (not gnus-article-decoded-p) ;; a local variable
6006                     (mm-disable-multibyte-mule4))))
6007             (when (or all-headers gnus-show-all-headers)
6008               (gnus-article-show-all-headers))
6009             (gnus-article-set-window-start
6010              (cdr (assq article gnus-newsgroup-bookmarks)))
6011             article)
6012         (when (or all-headers gnus-show-all-headers)
6013           (gnus-article-show-all-headers))
6014         'old))))
6015
6016 (defun gnus-summary-set-current-mark (&optional current-mark)
6017   "Obsolete function."
6018   nil)
6019
6020 (defun gnus-summary-next-article (&optional unread subject backward push)
6021   "Select the next article.
6022 If UNREAD, only unread articles are selected.
6023 If SUBJECT, only articles with SUBJECT are selected.
6024 If BACKWARD, the previous article is selected instead of the next."
6025   (interactive "P")
6026   (cond
6027    ;; Is there such an article?
6028    ((and (gnus-summary-search-forward unread subject backward)
6029          (or (gnus-summary-display-article (gnus-summary-article-number))
6030              (eq (gnus-summary-article-mark) gnus-canceled-mark)))
6031     (gnus-summary-position-point))
6032    ;; If not, we try the first unread, if that is wanted.
6033    ((and subject
6034          gnus-auto-select-same
6035          (gnus-summary-first-unread-article))
6036     (gnus-summary-position-point)
6037     (gnus-message 6 "Wrapped"))
6038    ;; Try to get next/previous article not displayed in this group.
6039    ((and gnus-auto-extend-newsgroup
6040          (not unread) (not subject))
6041     (gnus-summary-goto-article
6042      (if backward (1- gnus-newsgroup-begin) (1+ gnus-newsgroup-end))
6043      nil (count-lines (point-min) (point))))
6044    ;; Go to next/previous group.
6045    (t
6046     (unless (gnus-ephemeral-group-p gnus-newsgroup-name)
6047       (gnus-summary-jump-to-group gnus-newsgroup-name))
6048     (let ((cmd last-command-char)
6049           (point
6050            (save-excursion
6051              (set-buffer gnus-group-buffer)
6052              (point)))
6053           (group
6054            (if (eq gnus-keep-same-level 'best)
6055                (gnus-summary-best-group gnus-newsgroup-name)
6056              (gnus-summary-search-group backward gnus-keep-same-level))))
6057       ;; For some reason, the group window gets selected.  We change
6058       ;; it back.
6059       (select-window (get-buffer-window (current-buffer)))
6060       ;; Select next unread newsgroup automagically.
6061       (cond
6062        ((or (not gnus-auto-select-next)
6063             (not cmd))
6064         (gnus-message 7 "No more%s articles" (if unread " unread" "")))
6065        ((or (eq gnus-auto-select-next 'quietly)
6066             (and (eq gnus-auto-select-next 'slightly-quietly)
6067                  push)
6068             (and (eq gnus-auto-select-next 'almost-quietly)
6069                  (gnus-summary-last-article-p)))
6070         ;; Select quietly.
6071         (if (gnus-ephemeral-group-p gnus-newsgroup-name)
6072             (gnus-summary-exit)
6073           (gnus-message 7 "No more%s articles (%s)..."
6074                         (if unread " unread" "")
6075                         (if group (concat "selecting " group)
6076                           "exiting"))
6077           (gnus-summary-next-group nil group backward)))
6078        (t
6079         (when (gnus-key-press-event-p last-input-event)
6080           (gnus-summary-walk-group-buffer
6081            gnus-newsgroup-name cmd unread backward point))))))))
6082
6083 (defun gnus-summary-walk-group-buffer (from-group cmd unread backward start)
6084   (let ((keystrokes '((?\C-n (gnus-group-next-unread-group 1))
6085                       (?\C-p (gnus-group-prev-unread-group 1))))
6086         (cursor-in-echo-area t)
6087         keve key group ended)
6088     (save-excursion
6089       (set-buffer gnus-group-buffer)
6090       (goto-char start)
6091       (setq group
6092             (if (eq gnus-keep-same-level 'best)
6093                 (gnus-summary-best-group gnus-newsgroup-name)
6094               (gnus-summary-search-group backward gnus-keep-same-level))))
6095     (while (not ended)
6096       (gnus-message
6097        5 "No more%s articles%s" (if unread " unread" "")
6098        (if (and group
6099                 (not (gnus-ephemeral-group-p gnus-newsgroup-name)))
6100            (format " (Type %s for %s [%s])"
6101                    (single-key-description cmd) group
6102                    (car (gnus-gethash group gnus-newsrc-hashtb)))
6103          (format " (Type %s to exit %s)"
6104                  (single-key-description cmd)
6105                  gnus-newsgroup-name)))
6106       ;; Confirm auto selection.
6107       (setq key (car (setq keve (gnus-read-event-char))))
6108       (setq ended t)
6109       (cond
6110        ((assq key keystrokes)
6111         (let ((obuf (current-buffer)))
6112           (switch-to-buffer gnus-group-buffer)
6113           (when group
6114             (gnus-group-jump-to-group group))
6115           (eval (cadr (assq key keystrokes)))
6116           (setq group (gnus-group-group-name))
6117           (switch-to-buffer obuf))
6118         (setq ended nil))
6119        ((equal key cmd)
6120         (if (or (not group)
6121                 (gnus-ephemeral-group-p gnus-newsgroup-name))
6122             (gnus-summary-exit)
6123           (gnus-summary-next-group nil group backward)))
6124        (t
6125         (push (cdr keve) unread-command-events))))))
6126
6127 (defun gnus-summary-next-unread-article ()
6128   "Select unread article after current one."
6129   (interactive)
6130   (gnus-summary-next-article
6131    (or (not (eq gnus-summary-goto-unread 'never))
6132        (gnus-summary-last-article-p (gnus-summary-article-number)))
6133    (and gnus-auto-select-same
6134         (gnus-summary-article-subject))))
6135
6136 (defun gnus-summary-prev-article (&optional unread subject)
6137   "Select the article after the current one.
6138 If UNREAD is non-nil, only unread articles are selected."
6139   (interactive "P")
6140   (gnus-summary-next-article unread subject t))
6141
6142 (defun gnus-summary-prev-unread-article ()
6143   "Select unread article before current one."
6144   (interactive)
6145   (gnus-summary-prev-article
6146    (or (not (eq gnus-summary-goto-unread 'never))
6147        (gnus-summary-first-article-p (gnus-summary-article-number)))
6148    (and gnus-auto-select-same
6149         (gnus-summary-article-subject))))
6150
6151 (defun gnus-summary-next-page (&optional lines circular)
6152   "Show next page of the selected article.
6153 If at the end of the current article, select the next article.
6154 LINES says how many lines should be scrolled up.
6155
6156 If CIRCULAR is non-nil, go to the start of the article instead of
6157 selecting the next article when reaching the end of the current
6158 article."
6159   (interactive "P")
6160   (setq gnus-summary-buffer (current-buffer))
6161   (gnus-set-global-variables)
6162   (let ((article (gnus-summary-article-number))
6163         (article-window (get-buffer-window gnus-article-buffer t))
6164         endp)
6165     ;; If the buffer is empty, we have no article.
6166     (unless article
6167       (error "No article to select"))
6168     (gnus-configure-windows 'article)
6169     (if (eq (cdr (assq article gnus-newsgroup-reads)) gnus-canceled-mark)
6170         (if (and (eq gnus-summary-goto-unread 'never)
6171                  (not (gnus-summary-last-article-p article)))
6172             (gnus-summary-next-article)
6173           (gnus-summary-next-unread-article))
6174       (if (or (null gnus-current-article)
6175               (null gnus-article-current)
6176               (/= article (cdr gnus-article-current))
6177               (not (equal (car gnus-article-current) gnus-newsgroup-name)))
6178           ;; Selected subject is different from current article's.
6179           (gnus-summary-display-article article)
6180         (when article-window
6181           (gnus-eval-in-buffer-window gnus-article-buffer
6182             (setq endp (gnus-article-next-page lines)))
6183           (when endp
6184             (cond (circular
6185                    (gnus-summary-beginning-of-article))
6186                   (lines
6187                    (gnus-message 3 "End of message"))
6188                   ((null lines)
6189                    (if (and (eq gnus-summary-goto-unread 'never)
6190                             (not (gnus-summary-last-article-p article)))
6191                        (gnus-summary-next-article)
6192                      (gnus-summary-next-unread-article))))))))
6193     (gnus-summary-recenter)
6194     (gnus-summary-position-point)))
6195
6196 (defun gnus-summary-prev-page (&optional lines move)
6197   "Show previous page of selected article.
6198 Argument LINES specifies lines to be scrolled down.
6199 If MOVE, move to the previous unread article if point is at
6200 the beginning of the buffer."
6201   (interactive "P")
6202   (let ((article (gnus-summary-article-number))
6203         (article-window (get-buffer-window gnus-article-buffer t))
6204         endp)
6205     (gnus-configure-windows 'article)
6206     (if (or (null gnus-current-article)
6207             (null gnus-article-current)
6208             (/= article (cdr gnus-article-current))
6209             (not (equal (car gnus-article-current) gnus-newsgroup-name)))
6210         ;; Selected subject is different from current article's.
6211         (gnus-summary-display-article article)
6212       (gnus-summary-recenter)
6213       (when article-window
6214         (gnus-eval-in-buffer-window gnus-article-buffer
6215           (setq endp (gnus-article-prev-page lines)))
6216         (when (and move endp)
6217           (cond (lines
6218                  (gnus-message 3 "Beginning of message"))
6219                 ((null lines)
6220                  (if (and (eq gnus-summary-goto-unread 'never)
6221                           (not (gnus-summary-first-article-p article)))
6222                      (gnus-summary-prev-article)
6223                    (gnus-summary-prev-unread-article))))))))
6224   (gnus-summary-position-point))
6225
6226 (defun gnus-summary-prev-page-or-article (&optional lines)
6227   "Show previous page of selected article.
6228 Argument LINES specifies lines to be scrolled down.
6229 If at the beginning of the article, go to the next article."
6230   (interactive "P")
6231   (gnus-summary-prev-page lines t))
6232
6233 (defun gnus-summary-scroll-up (lines)
6234   "Scroll up (or down) one line current article.
6235 Argument LINES specifies lines to be scrolled up (or down if negative)."
6236   (interactive "p")
6237   (gnus-configure-windows 'article)
6238   (gnus-summary-show-thread)
6239   (when (eq (gnus-summary-select-article nil nil 'pseudo) 'old)
6240     (gnus-eval-in-buffer-window gnus-article-buffer
6241       (cond ((> lines 0)
6242              (when (gnus-article-next-page lines)
6243                (gnus-message 3 "End of message")))
6244             ((< lines 0)
6245              (gnus-article-prev-page (- lines))))))
6246   (gnus-summary-recenter)
6247   (gnus-summary-position-point))
6248
6249 (defun gnus-summary-scroll-down (lines)
6250   "Scroll down (or up) one line current article.
6251 Argument LINES specifies lines to be scrolled down (or up if negative)."
6252   (interactive "p")
6253   (gnus-summary-scroll-up (- lines)))
6254
6255 (defun gnus-summary-next-same-subject ()
6256   "Select next article which has the same subject as current one."
6257   (interactive)
6258   (gnus-summary-next-article nil (gnus-summary-article-subject)))
6259
6260 (defun gnus-summary-prev-same-subject ()
6261   "Select previous article which has the same subject as current one."
6262   (interactive)
6263   (gnus-summary-prev-article nil (gnus-summary-article-subject)))
6264
6265 (defun gnus-summary-next-unread-same-subject ()
6266   "Select next unread article which has the same subject as current one."
6267   (interactive)
6268   (gnus-summary-next-article t (gnus-summary-article-subject)))
6269
6270 (defun gnus-summary-prev-unread-same-subject ()
6271   "Select previous unread article which has the same subject as current one."
6272   (interactive)
6273   (gnus-summary-prev-article t (gnus-summary-article-subject)))
6274
6275 (defun gnus-summary-first-unread-article ()
6276   "Select the first unread article.
6277 Return nil if there are no unread articles."
6278   (interactive)
6279   (prog1
6280       (when (gnus-summary-first-subject t)
6281         (gnus-summary-show-thread)
6282         (gnus-summary-first-subject t)
6283         (gnus-summary-display-article (gnus-summary-article-number)))
6284     (gnus-summary-position-point)))
6285
6286 (defun gnus-summary-first-unread-subject ()
6287   "Place the point on the subject line of the first unread article.
6288 Return nil if there are no unread articles."
6289   (interactive)
6290   (prog1
6291       (when (gnus-summary-first-subject t)
6292         (gnus-summary-show-thread)
6293         (gnus-summary-first-subject t))
6294     (gnus-summary-position-point)))
6295
6296 (defun gnus-summary-first-article ()
6297   "Select the first article.
6298 Return nil if there are no articles."
6299   (interactive)
6300   (prog1
6301       (when (gnus-summary-first-subject)
6302         (gnus-summary-show-thread)
6303         (gnus-summary-first-subject)
6304         (gnus-summary-display-article (gnus-summary-article-number)))
6305     (gnus-summary-position-point)))
6306
6307 (defun gnus-summary-best-unread-article ()
6308   "Select the unread article with the highest score."
6309   (interactive)
6310   (let ((best -1000000)
6311         (data gnus-newsgroup-data)
6312         article score)
6313     (while data
6314       (and (gnus-data-unread-p (car data))
6315            (> (setq score
6316                     (gnus-summary-article-score (gnus-data-number (car data))))
6317               best)
6318            (setq best score
6319                  article (gnus-data-number (car data))))
6320       (setq data (cdr data)))
6321     (prog1
6322         (if article
6323             (gnus-summary-goto-article article)
6324           (error "No unread articles"))
6325       (gnus-summary-position-point))))
6326
6327 (defun gnus-summary-last-subject ()
6328   "Go to the last displayed subject line in the group."
6329   (let ((article (gnus-data-number (car (gnus-data-list t)))))
6330     (when article
6331       (gnus-summary-goto-subject article))))
6332
6333 (defun gnus-summary-goto-article (article &optional all-headers force)
6334   "Fetch ARTICLE (article number or Message-ID) and display it if it exists.
6335 If ALL-HEADERS is non-nil, no header lines are hidden.
6336 If FORCE, go to the article even if it isn't displayed.  If FORCE
6337 is a number, it is the line the article is to be displayed on."
6338   (interactive
6339    (list
6340     (completing-read
6341      "Article number or Message-ID: "
6342      (mapcar (lambda (number) (list (int-to-string number)))
6343              gnus-newsgroup-limit))
6344     current-prefix-arg
6345     t))
6346   (prog1
6347       (if (and (stringp article)
6348                (string-match "@" article))
6349           (gnus-summary-refer-article article)
6350         (when (stringp article)
6351           (setq article (string-to-number article)))
6352         (if (gnus-summary-goto-subject article force)
6353             (gnus-summary-display-article article all-headers)
6354           (gnus-message 4 "Couldn't go to article %s" article) nil))
6355     (gnus-summary-position-point)))
6356
6357 (defun gnus-summary-goto-last-article ()
6358   "Go to the previously read article."
6359   (interactive)
6360   (prog1
6361       (when gnus-last-article
6362         (gnus-summary-goto-article gnus-last-article nil t))
6363     (gnus-summary-position-point)))
6364
6365 (defun gnus-summary-pop-article (number)
6366   "Pop one article off the history and go to the previous.
6367 NUMBER articles will be popped off."
6368   (interactive "p")
6369   (let (to)
6370     (setq gnus-newsgroup-history
6371           (cdr (setq to (nthcdr number gnus-newsgroup-history))))
6372     (if to
6373         (gnus-summary-goto-article (car to) nil t)
6374       (error "Article history empty")))
6375   (gnus-summary-position-point))
6376
6377 ;; Summary commands and functions for limiting the summary buffer.
6378
6379 (defun gnus-summary-limit-to-articles (n)
6380   "Limit the summary buffer to the next N articles.
6381 If not given a prefix, use the process marked articles instead."
6382   (interactive "P")
6383   (prog1
6384       (let ((articles (gnus-summary-work-articles n)))
6385         (setq gnus-newsgroup-processable nil)
6386         (gnus-summary-limit articles))
6387     (gnus-summary-position-point)))
6388
6389 (defun gnus-summary-pop-limit (&optional total)
6390   "Restore the previous limit.
6391 If given a prefix, remove all limits."
6392   (interactive "P")
6393   (when total
6394     (setq gnus-newsgroup-limits
6395           (list (mapcar (lambda (h) (mail-header-number h))
6396                         gnus-newsgroup-headers))))
6397   (unless gnus-newsgroup-limits
6398     (error "No limit to pop"))
6399   (prog1
6400       (gnus-summary-limit nil 'pop)
6401     (gnus-summary-position-point)))
6402
6403 (defun gnus-summary-limit-to-subject (subject &optional header not-matching)
6404   "Limit the summary buffer to articles that have subjects that match a regexp.
6405 If NOT-MATCHING, excluding articles that have subjects that match a regexp."
6406   (interactive
6407    (list (read-string (if current-prefix-arg
6408                           "Exclude subject (regexp): "
6409                         "Limit to subject (regexp): "))
6410          nil current-prefix-arg))
6411   (unless header
6412     (setq header "subject"))
6413   (when (not (equal "" subject))
6414     (prog1
6415         (let ((articles (gnus-summary-find-matching
6416                          (or header "subject") subject 'all nil nil
6417                          not-matching)))
6418           (unless articles
6419             (error "Found no matches for \"%s\"" subject))
6420           (gnus-summary-limit articles))
6421       (gnus-summary-position-point))))
6422
6423 (defun gnus-summary-limit-to-author (from &optional not-matching)
6424   "Limit the summary buffer to articles that have authors that match a regexp.
6425 If NOT-MATCHING, excluding articles that have authors that match a regexp."
6426   (interactive
6427    (list (read-string (if current-prefix-arg
6428                           "Exclude author (regexp): "
6429                         "Limit to author (regexp): "))
6430          current-prefix-arg))
6431   (gnus-summary-limit-to-subject from "from" not-matching))
6432
6433 (defun gnus-summary-limit-to-age (age &optional younger-p)
6434   "Limit the summary buffer to articles that are older than (or equal) AGE days.
6435 If YOUNGER-P (the prefix) is non-nil, limit the summary buffer to
6436 articles that are younger than AGE days."
6437   (interactive
6438    (let ((younger current-prefix-arg)
6439          (days-got nil)
6440          days)
6441      (while (not days-got)
6442        (setq days (if younger
6443                       (read-string "Limit to articles within (in days): ")
6444                     (read-string "Limit to articles old than (in days): ")))
6445        (when (> (length days) 0)
6446          (setq days (read days)))
6447        (if (numberp days)
6448            (setq days-got t)
6449          (message "Please enter a number.")
6450          (sleep-for 1)))
6451      (list days younger)))
6452   (prog1
6453       (let ((data gnus-newsgroup-data)
6454             (cutoff (days-to-time age))
6455             articles d date is-younger)
6456         (while (setq d (pop data))
6457           (when (and (vectorp (gnus-data-header d))
6458                      (setq date (mail-header-date (gnus-data-header d))))
6459             (setq is-younger (time-less-p
6460                               (time-since (condition-case ()
6461                                               (date-to-time date)
6462                                             (error '(0 0))))
6463                               cutoff))
6464             (when (if younger-p
6465                       is-younger
6466                     (not is-younger))
6467               (push (gnus-data-number d) articles))))
6468         (gnus-summary-limit (nreverse articles)))
6469     (gnus-summary-position-point)))
6470
6471 (defun gnus-summary-limit-to-extra (header regexp &optional not-matching)
6472   "Limit the summary buffer to articles that match an 'extra' header."
6473   (interactive
6474    (let ((header
6475           (intern
6476            (gnus-completing-read
6477             (symbol-name (car gnus-extra-headers))
6478             (if current-prefix-arg
6479                 "Exclude extra header:"
6480               "Limit extra header:")
6481             (mapcar (lambda (x)
6482                       (cons (symbol-name x) x))
6483                     gnus-extra-headers)
6484             nil
6485             t))))
6486      (list header
6487            (read-string (format "%s header %s (regexp): "
6488                                 (if current-prefix-arg "Exclude" "Limit to")
6489                                 header))
6490            current-prefix-arg)))
6491   (when (not (equal "" regexp))
6492     (prog1
6493         (let ((articles (gnus-summary-find-matching
6494                          (cons 'extra header) regexp 'all nil nil
6495                          not-matching)))
6496           (unless articles
6497             (error "Found no matches for \"%s\"" regexp))
6498           (gnus-summary-limit articles))
6499       (gnus-summary-position-point))))
6500
6501 (defalias 'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread)
6502 (make-obsolete
6503  'gnus-summary-delete-marked-as-read 'gnus-summary-limit-to-unread)
6504
6505 (defun gnus-summary-limit-to-unread (&optional all)
6506   "Limit the summary buffer to articles that are not marked as read.
6507 If ALL is non-nil, limit strictly to unread articles."
6508   (interactive "P")
6509   (if all
6510       (gnus-summary-limit-to-marks (char-to-string gnus-unread-mark))
6511     (gnus-summary-limit-to-marks
6512      ;; Concat all the marks that say that an article is read and have
6513      ;; those removed.
6514      (list gnus-del-mark gnus-read-mark gnus-ancient-mark
6515            gnus-killed-mark gnus-kill-file-mark
6516            gnus-low-score-mark gnus-expirable-mark
6517            gnus-canceled-mark gnus-catchup-mark gnus-sparse-mark
6518            gnus-duplicate-mark gnus-souped-mark)
6519      'reverse)))
6520
6521 (defalias 'gnus-summary-delete-marked-with 'gnus-summary-limit-exclude-marks)
6522 (make-obsolete 'gnus-summary-delete-marked-with
6523                'gnus-summary-limit-exclude-marks)
6524
6525 (defun gnus-summary-limit-exclude-marks (marks &optional reverse)
6526   "Exclude articles that are marked with MARKS (e.g. \"DK\").
6527 If REVERSE, limit the summary buffer to articles that are marked
6528 with MARKS.  MARKS can either be a string of marks or a list of marks.
6529 Returns how many articles were removed."
6530   (interactive "sMarks: ")
6531   (gnus-summary-limit-to-marks marks t))
6532
6533 (defun gnus-summary-limit-to-marks (marks &optional reverse)
6534   "Limit the summary buffer to articles that are marked with MARKS (e.g. \"DK\").
6535 If REVERSE (the prefix), limit the summary buffer to articles that are
6536 not marked with MARKS.  MARKS can either be a string of marks or a
6537 list of marks.
6538 Returns how many articles were removed."
6539   (interactive "sMarks: \nP")
6540   (prog1
6541       (let ((data gnus-newsgroup-data)
6542             (marks (if (listp marks) marks
6543                      (append marks nil))) ; Transform to list.
6544             articles)
6545         (while data
6546           (when (if reverse (not (memq (gnus-data-mark (car data)) marks))
6547                   (memq (gnus-data-mark (car data)) marks))
6548             (push (gnus-data-number (car data)) articles))
6549           (setq data (cdr data)))
6550         (gnus-summary-limit articles))
6551     (gnus-summary-position-point)))
6552
6553 (defun gnus-summary-limit-to-score (&optional score)
6554   "Limit to articles with score at or above SCORE."
6555   (interactive "P")
6556   (setq score (if score
6557                   (prefix-numeric-value score)
6558                 (or gnus-summary-default-score 0)))
6559   (let ((data gnus-newsgroup-data)
6560         articles)
6561     (while data
6562       (when (>= (gnus-summary-article-score (gnus-data-number (car data)))
6563                 score)
6564         (push (gnus-data-number (car data)) articles))
6565       (setq data (cdr data)))
6566     (prog1
6567         (gnus-summary-limit articles)
6568       (gnus-summary-position-point))))
6569
6570 (defun gnus-summary-limit-include-thread (id)
6571   "Display all the hidden articles that in the current thread."
6572   (interactive (list (mail-header-id (gnus-summary-article-header))))
6573   (let ((articles (gnus-articles-in-thread
6574                    (gnus-id-to-thread (gnus-root-id id)))))
6575     (prog1
6576         (gnus-summary-limit (nconc articles gnus-newsgroup-limit))
6577       (gnus-summary-position-point))))
6578
6579 (defun gnus-summary-limit-include-dormant ()
6580   "Display all the hidden articles that are marked as dormant.
6581 Note that this command only works on a subset of the articles currently
6582 fetched for this group."
6583   (interactive)
6584   (unless gnus-newsgroup-dormant
6585     (error "There are no dormant articles in this group"))
6586   (prog1
6587       (gnus-summary-limit (append gnus-newsgroup-dormant gnus-newsgroup-limit))
6588     (gnus-summary-position-point)))
6589
6590 (defun gnus-summary-limit-exclude-dormant ()
6591   "Hide all dormant articles."
6592   (interactive)
6593   (prog1
6594       (gnus-summary-limit-to-marks (list gnus-dormant-mark) 'reverse)
6595     (gnus-summary-position-point)))
6596
6597 (defun gnus-summary-limit-exclude-childless-dormant ()
6598   "Hide all dormant articles that have no children."
6599   (interactive)
6600   (let ((data (gnus-data-list t))
6601         articles d children)
6602     ;; Find all articles that are either not dormant or have
6603     ;; children.
6604     (while (setq d (pop data))
6605       (when (or (not (= (gnus-data-mark d) gnus-dormant-mark))
6606                 (and (setq children
6607                            (gnus-article-children (gnus-data-number d)))
6608                      (let (found)
6609                        (while children
6610                          (when (memq (car children) articles)
6611                            (setq children nil
6612                                  found t))
6613                          (pop children))
6614                        found)))
6615         (push (gnus-data-number d) articles)))
6616     ;; Do the limiting.
6617     (prog1
6618         (gnus-summary-limit articles)
6619       (gnus-summary-position-point))))
6620
6621 (defun gnus-summary-limit-mark-excluded-as-read (&optional all)
6622   "Mark all unread excluded articles as read.
6623 If ALL, mark even excluded ticked and dormants as read."
6624   (interactive "P")
6625   (let ((articles (gnus-sorted-complement
6626                    (sort
6627                     (mapcar (lambda (h) (mail-header-number h))
6628                             gnus-newsgroup-headers)
6629                     '<)
6630                    (sort gnus-newsgroup-limit '<)))
6631         article)
6632     (setq gnus-newsgroup-unreads
6633           (gnus-intersection gnus-newsgroup-unreads gnus-newsgroup-limit))
6634     (if all
6635         (setq gnus-newsgroup-dormant nil
6636               gnus-newsgroup-marked nil
6637               gnus-newsgroup-reads
6638               (nconc
6639                (mapcar (lambda (n) (cons n gnus-catchup-mark)) articles)
6640                gnus-newsgroup-reads))
6641       (while (setq article (pop articles))
6642         (unless (or (memq article gnus-newsgroup-dormant)
6643                     (memq article gnus-newsgroup-marked))
6644           (push (cons article gnus-catchup-mark) gnus-newsgroup-reads))))))
6645
6646 (defun gnus-summary-limit (articles &optional pop)
6647   (if pop
6648       ;; We pop the previous limit off the stack and use that.
6649       (setq articles (car gnus-newsgroup-limits)
6650             gnus-newsgroup-limits (cdr gnus-newsgroup-limits))
6651     ;; We use the new limit, so we push the old limit on the stack.
6652     (push gnus-newsgroup-limit gnus-newsgroup-limits))
6653   ;; Set the limit.
6654   (setq gnus-newsgroup-limit articles)
6655   (let ((total (length gnus-newsgroup-data))
6656         (data (gnus-data-find-list (gnus-summary-article-number)))
6657         (gnus-summary-mark-below nil)   ; Inhibit this.
6658         found)
6659     ;; This will do all the work of generating the new summary buffer
6660     ;; according to the new limit.
6661     (gnus-summary-prepare)
6662     ;; Hide any threads, possibly.
6663     (and gnus-show-threads
6664          gnus-thread-hide-subtree
6665          (gnus-summary-hide-all-threads))
6666     ;; Try to return to the article you were at, or one in the
6667     ;; neighborhood.
6668     (when data
6669       ;; We try to find some article after the current one.
6670       (while data
6671         (when (gnus-summary-goto-subject (gnus-data-number (car data)) nil t)
6672           (setq data nil
6673                 found t))
6674         (setq data (cdr data))))
6675     (unless found
6676       ;; If there is no data, that means that we were after the last
6677       ;; article.  The same goes when we can't find any articles
6678       ;; after the current one.
6679       (goto-char (point-max))
6680       (gnus-summary-find-prev))
6681     (gnus-set-mode-line 'summary)
6682     ;; We return how many articles were removed from the summary
6683     ;; buffer as a result of the new limit.
6684     (- total (length gnus-newsgroup-data))))
6685
6686 (defsubst gnus-invisible-cut-children (threads)
6687   (let ((num 0))
6688     (while threads
6689       (when (memq (mail-header-number (caar threads)) gnus-newsgroup-limit)
6690         (incf num))
6691       (pop threads))
6692     (< num 2)))
6693
6694 (defsubst gnus-cut-thread (thread)
6695   "Go forwards in the thread until we find an article that we want to display."
6696   (when (or (eq gnus-fetch-old-headers 'some)
6697             (eq gnus-fetch-old-headers 'invisible)
6698             (numberp gnus-fetch-old-headers)
6699             (eq gnus-build-sparse-threads 'some)
6700             (eq gnus-build-sparse-threads 'more))
6701     ;; Deal with old-fetched headers and sparse threads.
6702     (while (and
6703             thread
6704             (or
6705              (gnus-summary-article-sparse-p (mail-header-number (car thread)))
6706              (gnus-summary-article-ancient-p
6707               (mail-header-number (car thread))))
6708             (if (or (<= (length (cdr thread)) 1)
6709                     (eq gnus-fetch-old-headers 'invisible))
6710                 (setq gnus-newsgroup-limit
6711                       (delq (mail-header-number (car thread))
6712                             gnus-newsgroup-limit)
6713                       thread (cadr thread))
6714               (when (gnus-invisible-cut-children (cdr thread))
6715                 (let ((th (cdr thread)))
6716                   (while th
6717                     (if (memq (mail-header-number (caar th))
6718                               gnus-newsgroup-limit)
6719                         (setq thread (car th)
6720                               th nil)
6721                       (setq th (cdr th))))))))))
6722   thread)
6723
6724 (defun gnus-cut-threads (threads)
6725   "Cut off all uninteresting articles from the beginning of threads."
6726   (when (or (eq gnus-fetch-old-headers 'some)
6727             (eq gnus-fetch-old-headers 'invisible)
6728             (numberp gnus-fetch-old-headers)
6729             (eq gnus-build-sparse-threads 'some)
6730             (eq gnus-build-sparse-threads 'more))
6731     (let ((th threads))
6732       (while th
6733         (setcar th (gnus-cut-thread (car th)))
6734         (setq th (cdr th)))))
6735   ;; Remove nixed out threads.
6736   (delq nil threads))
6737
6738 (defun gnus-summary-initial-limit (&optional show-if-empty)
6739   "Figure out what the initial limit is supposed to be on group entry.
6740 This entails weeding out unwanted dormants, low-scored articles,
6741 fetch-old-headers verbiage, and so on."
6742   ;; Most groups have nothing to remove.
6743   (if (or gnus-inhibit-limiting
6744           (and (null gnus-newsgroup-dormant)
6745                (not (eq gnus-fetch-old-headers 'some))
6746                (not (numberp gnus-fetch-old-headers))
6747                (not (eq gnus-fetch-old-headers 'invisible))
6748                (null gnus-summary-expunge-below)
6749                (not (eq gnus-build-sparse-threads 'some))
6750                (not (eq gnus-build-sparse-threads 'more))
6751                (null gnus-thread-expunge-below)
6752                (not gnus-use-nocem)))
6753       ()                                ; Do nothing.
6754     (push gnus-newsgroup-limit gnus-newsgroup-limits)
6755     (setq gnus-newsgroup-limit nil)
6756     (mapatoms
6757      (lambda (node)
6758        (unless (car (symbol-value node))
6759          ;; These threads have no parents -- they are roots.
6760          (let ((nodes (cdr (symbol-value node)))
6761                thread)
6762            (while nodes
6763              (if (and gnus-thread-expunge-below
6764                       (< (gnus-thread-total-score (car nodes))
6765                          gnus-thread-expunge-below))
6766                  (gnus-expunge-thread (pop nodes))
6767                (setq thread (pop nodes))
6768                (gnus-summary-limit-children thread))))))
6769      gnus-newsgroup-dependencies)
6770     ;; If this limitation resulted in an empty group, we might
6771     ;; pop the previous limit and use it instead.
6772     (when (and (not gnus-newsgroup-limit)
6773                show-if-empty)
6774       (setq gnus-newsgroup-limit (pop gnus-newsgroup-limits)))
6775     gnus-newsgroup-limit))
6776
6777 (defun gnus-summary-limit-children (thread)
6778   "Return 1 if this subthread is visible and 0 if it is not."
6779   ;; First we get the number of visible children to this thread.  This
6780   ;; is done by recursing down the thread using this function, so this
6781   ;; will really go down to a leaf article first, before slowly
6782   ;; working its way up towards the root.
6783   (when thread
6784     (let ((children
6785            (if (cdr thread)
6786                (apply '+ (mapcar 'gnus-summary-limit-children
6787                                  (cdr thread)))
6788              0))
6789           (number (mail-header-number (car thread)))
6790           score)
6791       (if (and
6792            (not (memq number gnus-newsgroup-marked))
6793            (or
6794             ;; If this article is dormant and has absolutely no visible
6795             ;; children, then this article isn't visible.
6796             (and (memq number gnus-newsgroup-dormant)
6797                  (zerop children))
6798             ;; If this is "fetch-old-headered" and there is no
6799             ;; visible children, then we don't want this article.
6800             (and (or (eq gnus-fetch-old-headers 'some)
6801                      (numberp gnus-fetch-old-headers))
6802                  (gnus-summary-article-ancient-p number)
6803                  (zerop children))
6804             ;; If this is "fetch-old-headered" and `invisible', then
6805             ;; we don't want this article.
6806             (and (eq gnus-fetch-old-headers 'invisible)
6807                  (gnus-summary-article-ancient-p number))
6808             ;; If this is a sparsely inserted article with no children,
6809             ;; we don't want it.
6810             (and (eq gnus-build-sparse-threads 'some)
6811                  (gnus-summary-article-sparse-p number)
6812                  (zerop children))
6813             ;; If we use expunging, and this article is really
6814             ;; low-scored, then we don't want this article.
6815             (when (and gnus-summary-expunge-below
6816                        (< (setq score
6817                                 (or (cdr (assq number gnus-newsgroup-scored))
6818                                     gnus-summary-default-score))
6819                           gnus-summary-expunge-below))
6820               ;; We increase the expunge-tally here, but that has
6821               ;; nothing to do with the limits, really.
6822               (incf gnus-newsgroup-expunged-tally)
6823               ;; We also mark as read here, if that's wanted.
6824               (when (and gnus-summary-mark-below
6825                          (< score gnus-summary-mark-below))
6826                 (setq gnus-newsgroup-unreads
6827                       (delq number gnus-newsgroup-unreads))
6828                 (if gnus-newsgroup-auto-expire
6829                     (push number gnus-newsgroup-expirable)
6830                   (push (cons number gnus-low-score-mark)
6831                         gnus-newsgroup-reads)))
6832               t)
6833             ;; Check NoCeM things.
6834             (if (and gnus-use-nocem
6835                      (gnus-nocem-unwanted-article-p
6836                       (mail-header-id (car thread))))
6837                 (progn
6838                   (setq gnus-newsgroup-unreads
6839                         (delq number gnus-newsgroup-unreads))
6840                   t))))
6841           ;; Nope, invisible article.
6842           0
6843         ;; Ok, this article is to be visible, so we add it to the limit
6844         ;; and return 1.
6845         (push number gnus-newsgroup-limit)
6846         1))))
6847
6848 (defun gnus-expunge-thread (thread)
6849   "Mark all articles in THREAD as read."
6850   (let* ((number (mail-header-number (car thread))))
6851     (incf gnus-newsgroup-expunged-tally)
6852     ;; We also mark as read here, if that's wanted.
6853     (setq gnus-newsgroup-unreads
6854           (delq number gnus-newsgroup-unreads))
6855     (if gnus-newsgroup-auto-expire
6856         (push number gnus-newsgroup-expirable)
6857       (push (cons number gnus-low-score-mark)
6858             gnus-newsgroup-reads)))
6859   ;; Go recursively through all subthreads.
6860   (mapcar 'gnus-expunge-thread (cdr thread)))
6861
6862 ;; Summary article oriented commands
6863
6864 (defun gnus-summary-refer-parent-article (n)
6865   "Refer parent article N times.
6866 If N is negative, go to ancestor -N instead.
6867 The difference between N and the number of articles fetched is returned."
6868   (interactive "p")
6869   (let ((skip 1)
6870         error header ref)
6871     (when (not (natnump n))
6872       (setq skip (abs n)
6873             n 1))
6874     (while (and (> n 0)
6875                 (not error))
6876       (setq header (gnus-summary-article-header))
6877       (if (and (eq (mail-header-number header)
6878                    (cdr gnus-article-current))
6879                (equal gnus-newsgroup-name
6880                       (car gnus-article-current)))
6881           ;; If we try to find the parent of the currently
6882           ;; displayed article, then we take a look at the actual
6883           ;; References header, since this is slightly more
6884           ;; reliable than the References field we got from the
6885           ;; server.
6886           (save-excursion
6887             (set-buffer gnus-original-article-buffer)
6888             (nnheader-narrow-to-headers)
6889             (unless (setq ref (message-fetch-field "references"))
6890               (setq ref (message-fetch-field "in-reply-to")))
6891             (widen))
6892         (setq ref
6893               ;; It's not the current article, so we take a bet on
6894               ;; the value we got from the server.
6895               (mail-header-references header)))
6896       (if (and ref
6897                (not (equal ref "")))
6898           (unless (gnus-summary-refer-article (gnus-parent-id ref skip))
6899             (gnus-message 1 "Couldn't find parent"))
6900         (gnus-message 1 "No references in article %d"
6901                       (gnus-summary-article-number))
6902         (setq error t))
6903       (decf n))
6904     (gnus-summary-position-point)
6905     n))
6906
6907 (defun gnus-summary-refer-references ()
6908   "Fetch all articles mentioned in the References header.
6909 Return the number of articles fetched."
6910   (interactive)
6911   (let ((ref (mail-header-references (gnus-summary-article-header)))
6912         (current (gnus-summary-article-number))
6913         (n 0))
6914     (if (or (not ref)
6915             (equal ref ""))
6916         (error "No References in the current article")
6917       ;; For each Message-ID in the References header...
6918       (while (string-match "<[^>]*>" ref)
6919         (incf n)
6920         ;; ... fetch that article.
6921         (gnus-summary-refer-article
6922          (prog1 (match-string 0 ref)
6923            (setq ref (substring ref (match-end 0))))))
6924       (gnus-summary-goto-subject current)
6925       (gnus-summary-position-point)
6926       n)))
6927
6928 (defun gnus-summary-refer-thread (&optional limit)
6929   "Fetch all articles in the current thread.
6930 If LIMIT (the numerical prefix), fetch that many old headers instead
6931 of what's specified by the `gnus-refer-thread-limit' variable."
6932   (interactive "P")
6933   (let ((id (mail-header-id (gnus-summary-article-header)))
6934         (limit (if limit (prefix-numeric-value limit)
6935                  gnus-refer-thread-limit)))
6936     ;; We want to fetch LIMIT *old* headers, but we also have to
6937     ;; re-fetch all the headers in the current buffer, because many of
6938     ;; them may be undisplayed.  So we adjust LIMIT.
6939     (when (numberp limit)
6940       (incf limit (- gnus-newsgroup-end gnus-newsgroup-begin)))
6941     (unless (eq gnus-fetch-old-headers 'invisible)
6942       (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
6943       ;; Retrieve the headers and read them in.
6944       (if (eq (gnus-retrieve-headers
6945                (list gnus-newsgroup-end) gnus-newsgroup-name limit)
6946               'nov)
6947           (gnus-build-all-threads)
6948         (error "Can't fetch thread from backends that don't support NOV"))
6949       (gnus-message 5 "Fetching headers for %s...done" gnus-newsgroup-name))
6950     (gnus-summary-limit-include-thread id)))
6951
6952 (defun gnus-summary-refer-article (message-id)
6953   "Fetch an article specified by MESSAGE-ID."
6954   (interactive "sMessage-ID: ")
6955   (when (and (stringp message-id)
6956              (not (zerop (length message-id))))
6957     ;; Construct the correct Message-ID if necessary.
6958     ;; Suggested by tale@pawl.rpi.edu.
6959     (unless (string-match "^<" message-id)
6960       (setq message-id (concat "<" message-id)))
6961     (unless (string-match ">$" message-id)
6962       (setq message-id (concat message-id ">")))
6963     (let* ((header (gnus-id-to-header message-id))
6964            (sparse (and header
6965                         (gnus-summary-article-sparse-p
6966                          (mail-header-number header))
6967                         (memq (mail-header-number header)
6968                               gnus-newsgroup-limit)))
6969            number)
6970       (cond
6971        ;; If the article is present in the buffer we just go to it.
6972        ((and header
6973              (or (not (gnus-summary-article-sparse-p
6974                        (mail-header-number header)))
6975                  sparse))
6976         (prog1
6977             (gnus-summary-goto-article
6978              (mail-header-number header) nil t)
6979           (when sparse
6980             (gnus-summary-update-article (mail-header-number header)))))
6981        (t
6982         ;; We fetch the article.
6983         (catch 'found
6984           (dolist (gnus-override-method (gnus-refer-article-methods))
6985             (gnus-check-server gnus-override-method)
6986             ;; Fetch the header, and display the article.
6987             (when (setq number (gnus-summary-insert-subject message-id))
6988               (gnus-summary-select-article nil nil nil number)
6989               (throw 'found t)))
6990           (gnus-message 3 "Couldn't fetch article %s" message-id)))))))
6991
6992 (defun gnus-refer-article-methods ()
6993   "Return a list of referrable methods."
6994   (cond
6995    ;; No method, so we default to current and native.
6996    ((null gnus-refer-article-method)
6997     (list gnus-current-select-method gnus-select-method))
6998    ;; Current.
6999    ((eq 'current gnus-refer-article-method)
7000     (list gnus-current-select-method))
7001    ;; List of select methods.
7002    ((not (and (symbolp (car gnus-refer-article-method))
7003               (assq (car gnus-refer-article-method) nnoo-definition-alist)))
7004     (let (out)
7005       (dolist (method gnus-refer-article-method)
7006         (push (if (eq 'current method)
7007                   gnus-current-select-method
7008                 method)
7009               out))
7010       (nreverse out)))
7011    ;; One single select method.
7012    (t
7013     (list gnus-refer-article-method))))
7014
7015 (defun gnus-summary-edit-parameters ()
7016   "Edit the group parameters of the current group."
7017   (interactive)
7018   (gnus-group-edit-group gnus-newsgroup-name 'params))
7019
7020 (defun gnus-summary-customize-parameters ()
7021   "Customize the group parameters of the current group."
7022   (interactive)
7023   (gnus-group-customize gnus-newsgroup-name))
7024
7025 (defun gnus-summary-enter-digest-group (&optional force)
7026   "Enter an nndoc group based on the current article.
7027 If FORCE, force a digest interpretation.  If not, try
7028 to guess what the document format is."
7029   (interactive "P")
7030   (let ((conf gnus-current-window-configuration))
7031     (save-excursion
7032       (gnus-summary-select-article))
7033     (setq gnus-current-window-configuration conf)
7034     (let* ((name (format "%s-%d"
7035                          (gnus-group-prefixed-name
7036                           gnus-newsgroup-name (list 'nndoc ""))
7037                          (save-excursion
7038                            (set-buffer gnus-summary-buffer)
7039                            gnus-current-article)))
7040            (ogroup gnus-newsgroup-name)
7041            (params (append (gnus-info-params (gnus-get-info ogroup))
7042                            (list (cons 'to-group ogroup))
7043                            (list (cons 'save-article-group ogroup))))
7044            (case-fold-search t)
7045            (buf (current-buffer))
7046            dig to-address)
7047       (save-excursion
7048         (set-buffer gnus-original-article-buffer)
7049         ;; Have the digest group inherit the main mail address of
7050         ;; the parent article.
7051         (when (setq to-address (or (message-fetch-field "reply-to")
7052                                    (message-fetch-field "from")))
7053           (setq params (append
7054                         (list (cons 'to-address
7055                                     (funcall gnus-decode-encoded-word-function
7056                                              to-address))))))
7057         (setq dig (nnheader-set-temp-buffer " *gnus digest buffer*"))
7058         (insert-buffer-substring gnus-original-article-buffer)
7059         ;; Remove lines that may lead nndoc to misinterpret the
7060         ;; document type.
7061         (narrow-to-region
7062          (goto-char (point-min))
7063          (or (search-forward "\n\n" nil t) (point)))
7064         (goto-char (point-min))
7065         (delete-matching-lines "^Path:\\|^From ")
7066         (widen))
7067       (unwind-protect
7068           (if (let ((gnus-newsgroup-ephemeral-charset gnus-newsgroup-charset)
7069                     (gnus-newsgroup-ephemeral-ignored-charsets
7070                      gnus-newsgroup-ignored-charsets))
7071                 (gnus-group-read-ephemeral-group
7072                  name `(nndoc ,name (nndoc-address ,(get-buffer dig))
7073                               (nndoc-article-type
7074                                ,(if force 'mbox 'guess))) t))
7075               ;; Make all postings to this group go to the parent group.
7076               (nconc (gnus-info-params (gnus-get-info name))
7077                      params)
7078             ;; Couldn't select this doc group.
7079             (switch-to-buffer buf)
7080             (gnus-set-global-variables)
7081             (gnus-configure-windows 'summary)
7082             (gnus-message 3 "Article couldn't be entered?"))
7083         (kill-buffer dig)))))
7084
7085 (defun gnus-summary-read-document (n)
7086   "Open a new group based on the current article(s).
7087 This will allow you to read digests and other similar
7088 documents as newsgroups.
7089 Obeys the standard process/prefix convention."
7090   (interactive "P")
7091   (let* ((articles (gnus-summary-work-articles n))
7092          (ogroup gnus-newsgroup-name)
7093          (params (append (gnus-info-params (gnus-get-info ogroup))
7094                          (list (cons 'to-group ogroup))))
7095          article group egroup groups vgroup)
7096     (while (setq article (pop articles))
7097       (setq group (format "%s-%d" gnus-newsgroup-name article))
7098       (gnus-summary-remove-process-mark article)
7099       (when (gnus-summary-display-article article)
7100         (save-excursion
7101           (with-temp-buffer
7102             (insert-buffer-substring gnus-original-article-buffer)
7103             ;; Remove some headers that may lead nndoc to make
7104             ;; the wrong guess.
7105             (message-narrow-to-head)
7106             (goto-char (point-min))
7107             (delete-matching-lines "^\\(Path\\):\\|^From ")
7108             (widen)
7109             (if (setq egroup
7110                       (gnus-group-read-ephemeral-group
7111                        group `(nndoc ,group (nndoc-address ,(current-buffer))
7112                                      (nndoc-article-type guess))
7113                        t nil t))
7114                 (progn
7115                   ;; Make all postings to this group go to the parent group.
7116                   (nconc (gnus-info-params (gnus-get-info egroup))
7117                          params)
7118                   (push egroup groups))
7119               ;; Couldn't select this doc group.
7120               (gnus-error 3 "Article couldn't be entered"))))))
7121     ;; Now we have selected all the documents.
7122     (cond
7123      ((not groups)
7124       (error "None of the articles could be interpreted as documents"))
7125      ((gnus-group-read-ephemeral-group
7126        (setq vgroup (format
7127                      "nnvirtual:%s-%s" gnus-newsgroup-name
7128                      (format-time-string "%Y%m%dT%H%M%S" (current-time))))
7129        `(nnvirtual ,vgroup (nnvirtual-component-groups ,groups))
7130        t
7131        (cons (current-buffer) 'summary)))
7132      (t
7133       (error "Couldn't select virtual nndoc group")))))
7134
7135 (defun gnus-summary-isearch-article (&optional regexp-p)
7136   "Do incremental search forward on the current article.
7137 If REGEXP-P (the prefix) is non-nil, do regexp isearch."
7138   (interactive "P")
7139   (gnus-summary-select-article)
7140   (gnus-configure-windows 'article)
7141   (gnus-eval-in-buffer-window gnus-article-buffer
7142     (save-restriction
7143       (widen)
7144       (isearch-forward regexp-p))))
7145
7146 (defun gnus-summary-search-article-forward (regexp &optional backward)
7147   "Search for an article containing REGEXP forward.
7148 If BACKWARD, search backward instead."
7149   (interactive
7150    (list (read-string
7151           (format "Search article %s (regexp%s): "
7152                   (if current-prefix-arg "backward" "forward")
7153                   (if gnus-last-search-regexp
7154                       (concat ", default " gnus-last-search-regexp)
7155                     "")))
7156          current-prefix-arg))
7157   (if (string-equal regexp "")
7158       (setq regexp (or gnus-last-search-regexp ""))
7159     (setq gnus-last-search-regexp regexp))
7160   (if (gnus-summary-search-article regexp backward)
7161       (gnus-summary-show-thread)
7162     (error "Search failed: \"%s\"" regexp)))
7163
7164 (defun gnus-summary-search-article-backward (regexp)
7165   "Search for an article containing REGEXP backward."
7166   (interactive
7167    (list (read-string
7168           (format "Search article backward (regexp%s): "
7169                   (if gnus-last-search-regexp
7170                       (concat ", default " gnus-last-search-regexp)
7171                     "")))))
7172   (gnus-summary-search-article-forward regexp 'backward))
7173
7174 (defun gnus-summary-search-article (regexp &optional backward)
7175   "Search for an article containing REGEXP.
7176 Optional argument BACKWARD means do search for backward.
7177 `gnus-select-article-hook' is not called during the search."
7178   ;; We have to require this here to make sure that the following
7179   ;; dynamic binding isn't shadowed by autoloading.
7180   (require 'gnus-async)
7181   (require 'gnus-art)
7182   (let ((gnus-select-article-hook nil)  ;Disable hook.
7183         (gnus-article-prepare-hook nil)
7184         (gnus-mark-article-hook nil)    ;Inhibit marking as read.
7185         (gnus-use-article-prefetch nil)
7186         (gnus-xmas-force-redisplay nil) ;Inhibit XEmacs redisplay.
7187         (gnus-use-trees nil)            ;Inhibit updating tree buffer.
7188         (sum (current-buffer))
7189         (gnus-display-mime-function nil)
7190         (found nil)
7191         point)
7192     (gnus-save-hidden-threads
7193       (gnus-summary-select-article)
7194       (set-buffer gnus-article-buffer)
7195       (goto-char (window-point (get-buffer-window (current-buffer))))
7196       (when backward
7197         (forward-line -1))
7198       (while (not found)
7199         (gnus-message 7 "Searching article: %d..." (cdr gnus-article-current))
7200         (if (if backward
7201                 (re-search-backward regexp nil t)
7202               (re-search-forward regexp nil t))
7203             ;; We found the regexp.
7204             (progn
7205               (setq found 'found)
7206               (beginning-of-line)
7207               (set-window-start
7208                (get-buffer-window (current-buffer))
7209                (point))
7210               (forward-line 1)
7211               (set-window-point
7212                (get-buffer-window (current-buffer))
7213                (point))
7214               (set-buffer sum)
7215               (setq point (point)))
7216           ;; We didn't find it, so we go to the next article.
7217           (set-buffer sum)
7218           (setq found 'not)
7219           (while (eq found 'not)
7220             (if (not (if backward (gnus-summary-find-prev)
7221                        (gnus-summary-find-next)))
7222                 ;; No more articles.
7223                 (setq found t)
7224               ;; Select the next article and adjust point.
7225               (unless (gnus-summary-article-sparse-p
7226                        (gnus-summary-article-number))
7227                 (setq found nil)
7228                 (gnus-summary-select-article)
7229                 (set-buffer gnus-article-buffer)
7230                 (widen)
7231                 (goto-char (if backward (point-max) (point-min))))))))
7232       (gnus-message 7 ""))
7233     ;; Return whether we found the regexp.
7234     (when (eq found 'found)
7235       (goto-char point)
7236       (gnus-summary-show-thread)
7237       (gnus-summary-goto-subject gnus-current-article)
7238       (gnus-summary-position-point)
7239       t)))
7240
7241 (defun gnus-summary-find-matching (header regexp &optional backward unread
7242                                           not-case-fold not-matching)
7243   "Return a list of all articles that match REGEXP on HEADER.
7244 The search stars on the current article and goes forwards unless
7245 BACKWARD is non-nil.  If BACKWARD is `all', do all articles.
7246 If UNREAD is non-nil, only unread articles will
7247 be taken into consideration.  If NOT-CASE-FOLD, case won't be folded
7248 in the comparisons. If NOT-MATCHING, return a list of all articles that
7249 not match REGEXP on HEADER."
7250   (let ((case-fold-search (not not-case-fold))
7251         articles d func)
7252     (if (consp header)
7253         (if (eq (car header) 'extra)
7254             (setq func
7255                   `(lambda (h)
7256                      (or (cdr (assq ',(cdr header) (mail-header-extra h)))
7257                          "")))
7258           (error "%s is an invalid header" header))
7259       (unless (fboundp (intern (concat "mail-header-" header)))
7260         (error "%s is not a valid header" header))
7261       (setq func `(lambda (h) (,(intern (concat "mail-header-" header)) h))))
7262     (dolist (d (if (eq backward 'all)
7263                    gnus-newsgroup-data
7264                  (gnus-data-find-list
7265                   (gnus-summary-article-number)
7266                   (gnus-data-list backward))))
7267       (when (and (or (not unread)       ; We want all articles...
7268                      (gnus-data-unread-p d)) ; Or just unreads.
7269                  (vectorp (gnus-data-header d)) ; It's not a pseudo.
7270                  (if not-matching
7271                      (not (string-match
7272                            regexp
7273                            (funcall func (gnus-data-header d))))
7274                    (string-match regexp
7275                                  (funcall func (gnus-data-header d)))))
7276         (push (gnus-data-number d) articles))) ; Success!
7277     (nreverse articles)))
7278
7279 (defun gnus-summary-execute-command (header regexp command &optional backward)
7280   "Search forward for an article whose HEADER matches REGEXP and execute COMMAND.
7281 If HEADER is an empty string (or nil), the match is done on the entire
7282 article.  If BACKWARD (the prefix) is non-nil, search backward instead."
7283   (interactive
7284    (list (let ((completion-ignore-case t))
7285            (completing-read
7286             "Header name: "
7287             (mapcar (lambda (string) (list string))
7288                     '("Number" "Subject" "From" "Lines" "Date"
7289                       "Message-ID" "Xref" "References" "Body"))
7290             nil 'require-match))
7291          (read-string "Regexp: ")
7292          (read-key-sequence "Command: ")
7293          current-prefix-arg))
7294   (when (equal header "Body")
7295     (setq header ""))
7296   ;; Hidden thread subtrees must be searched as well.
7297   (gnus-summary-show-all-threads)
7298   ;; We don't want to change current point nor window configuration.
7299   (save-excursion
7300     (save-window-excursion
7301       (gnus-message 6 "Executing %s..." (key-description command))
7302       ;; We'd like to execute COMMAND interactively so as to give arguments.
7303       (gnus-execute header regexp
7304                     `(call-interactively ',(key-binding command))
7305                     backward)
7306       (gnus-message 6 "Executing %s...done" (key-description command)))))
7307
7308 (defun gnus-summary-beginning-of-article ()
7309   "Scroll the article back to the beginning."
7310   (interactive)
7311   (gnus-summary-select-article)
7312   (gnus-configure-windows 'article)
7313   (gnus-eval-in-buffer-window gnus-article-buffer
7314     (widen)
7315     (goto-char (point-min))
7316     (when gnus-page-broken
7317       (gnus-narrow-to-page))))
7318
7319 (defun gnus-summary-end-of-article ()
7320   "Scroll to the end of the article."
7321   (interactive)
7322   (gnus-summary-select-article)
7323   (gnus-configure-windows 'article)
7324   (gnus-eval-in-buffer-window gnus-article-buffer
7325     (widen)
7326     (goto-char (point-max))
7327     (recenter -3)
7328     (when gnus-page-broken
7329       (gnus-narrow-to-page))))
7330
7331 (defun gnus-summary-print-article (&optional filename n)
7332   "Generate and print a PostScript image of the N next (mail) articles.
7333
7334 If N is negative, print the N previous articles.  If N is nil and articles
7335 have been marked with the process mark, print these instead.
7336
7337 If the optional first argument FILENAME is nil, send the image to the
7338 printer.  If FILENAME is a string, save the PostScript image in a file with
7339 that name.  If FILENAME is a number, prompt the user for the name of the file
7340 to save in."
7341   (interactive (list (ps-print-preprint current-prefix-arg)))
7342   (dolist (article (gnus-summary-work-articles n))
7343     (gnus-summary-select-article nil nil 'pseudo article)
7344     (gnus-eval-in-buffer-window gnus-article-buffer
7345       (let ((buffer (generate-new-buffer " *print*")))
7346         (unwind-protect
7347             (progn
7348               (copy-to-buffer buffer (point-min) (point-max))
7349               (set-buffer buffer)
7350               (gnus-article-delete-invisible-text)
7351               (let ((ps-left-header
7352                      (list
7353                       (concat "("
7354                               (mail-header-subject gnus-current-headers) ")")
7355                       (concat "("
7356                               (mail-header-from gnus-current-headers) ")")))
7357                     (ps-right-header
7358                      (list
7359                       "/pagenumberstring load"
7360                       (concat "("
7361                               (mail-header-date gnus-current-headers) ")"))))
7362                 (gnus-run-hooks 'gnus-ps-print-hook)
7363                 (save-excursion
7364                   (ps-spool-buffer-with-faces))))
7365           (kill-buffer buffer))))
7366     (gnus-summary-remove-process-mark article))
7367   (ps-despool filename))
7368
7369 (defun gnus-summary-show-article (&optional arg)
7370   "Force re-fetching of the current article.
7371 If ARG (the prefix) is a number, show the article with the charset
7372 defined in `gnus-summary-show-article-charset-alist', or the charset
7373 inputed.
7374 If ARG (the prefix) is non-nil and not a number, show the raw article
7375 without any article massaging functions being run."
7376   (interactive "P")
7377   (cond
7378    ((numberp arg)
7379     (let ((gnus-newsgroup-charset
7380            (or (cdr (assq arg gnus-summary-show-article-charset-alist))
7381                (read-coding-system "Charset: ")))
7382           (gnus-newsgroup-ignored-charsets 'gnus-all))
7383       (gnus-summary-select-article nil 'force)))
7384    ((not arg)
7385     ;; Select the article the normal way.
7386     (gnus-summary-select-article nil 'force))
7387    (t
7388     ;; We have to require this here to make sure that the following
7389     ;; dynamic binding isn't shadowed by autoloading.
7390     (require 'gnus-async)
7391     (require 'gnus-art)
7392     ;; Bind the article treatment functions to nil.
7393     (let ((gnus-have-all-headers t)
7394           gnus-article-prepare-hook
7395           gnus-article-decode-hook
7396           gnus-display-mime-function
7397           gnus-break-pages)
7398       ;; Destroy any MIME parts.
7399       (when (gnus-buffer-live-p gnus-article-buffer)
7400         (save-excursion
7401           (set-buffer gnus-article-buffer)
7402           (mm-destroy-parts gnus-article-mime-handles)
7403           ;; Set it to nil for safety reason.
7404           (setq gnus-article-mime-handle-alist nil)
7405           (setq gnus-article-mime-handles nil)))
7406       (gnus-summary-select-article nil 'force))))
7407   (gnus-summary-goto-subject gnus-current-article)
7408   (gnus-summary-position-point))
7409
7410 (defun gnus-summary-verbose-headers (&optional arg)
7411   "Toggle permanent full header display.
7412 If ARG is a positive number, turn header display on.
7413 If ARG is a negative number, turn header display off."
7414   (interactive "P")
7415   (setq gnus-show-all-headers
7416         (cond ((or (not (numberp arg))
7417                    (zerop arg))
7418                (not gnus-show-all-headers))
7419               ((natnump arg)
7420                t)))
7421   (gnus-summary-show-article))
7422
7423 (defun gnus-summary-toggle-header (&optional arg)
7424   "Show the headers if they are hidden, or hide them if they are shown.
7425 If ARG is a positive number, show the entire header.
7426 If ARG is a negative number, hide the unwanted header lines."
7427   (interactive "P")
7428   (save-excursion
7429     (set-buffer gnus-article-buffer)
7430     (save-restriction
7431       (let* ((buffer-read-only nil)
7432              (inhibit-point-motion-hooks t)
7433              hidden s e)
7434         (setq hidden
7435               (if (numberp arg)
7436                   (>= arg 0)
7437                 (save-restriction
7438                   (article-narrow-to-head)
7439                   (gnus-article-hidden-text-p 'headers))))
7440         (goto-char (point-min))
7441         (when (search-forward "\n\n" nil t)
7442           (delete-region (point-min) (1- (point))))
7443         (goto-char (point-min))
7444         (with-current-buffer gnus-original-article-buffer
7445           (goto-char (setq s (point-min)))
7446           (setq e (1- (or (search-forward "\n\n" nil t) (point-max)))))
7447         (insert-buffer-substring gnus-original-article-buffer s e)
7448         (save-restriction
7449           (narrow-to-region (point-min) (point))
7450           (article-decode-encoded-words)
7451           (if  hidden
7452               (let ((gnus-treat-hide-headers nil)
7453                     (gnus-treat-hide-boring-headers nil))
7454                 (setq gnus-article-wash-types
7455                       (delq 'headers gnus-article-wash-types))
7456                 (gnus-treat-article 'head))
7457             (gnus-treat-article 'head)))
7458         (gnus-set-mode-line 'article)))))
7459
7460 (defun gnus-summary-show-all-headers ()
7461   "Make all header lines visible."
7462   (interactive)
7463   (gnus-article-show-all-headers))
7464
7465 (defun gnus-summary-caesar-message (&optional arg)
7466   "Caesar rotate the current article by 13.
7467 The numerical prefix specifies how many places to rotate each letter
7468 forward."
7469   (interactive "P")
7470   (gnus-summary-select-article)
7471   (let ((mail-header-separator ""))
7472     (gnus-eval-in-buffer-window gnus-article-buffer
7473       (save-restriction
7474         (widen)
7475         (let ((start (window-start))
7476               buffer-read-only)
7477           (message-caesar-buffer-body arg)
7478           (set-window-start (get-buffer-window (current-buffer)) start))))))
7479
7480 (defun gnus-summary-stop-page-breaking ()
7481   "Stop page breaking in the current article."
7482   (interactive)
7483   (gnus-summary-select-article)
7484   (gnus-eval-in-buffer-window gnus-article-buffer
7485     (widen)
7486     (when (gnus-visual-p 'page-marker)
7487       (let ((buffer-read-only nil))
7488         (gnus-remove-text-with-property 'gnus-prev)
7489         (gnus-remove-text-with-property 'gnus-next))
7490       (setq gnus-page-broken nil))))
7491
7492 (defun gnus-summary-move-article (&optional n to-newsgroup
7493                                             select-method action)
7494   "Move the current article to a different newsgroup.
7495 If N is a positive number, move the N next articles.
7496 If N is a negative number, move the N previous articles.
7497 If N is nil and any articles have been marked with the process mark,
7498 move those articles instead.
7499 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
7500 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
7501 re-spool using this method.
7502
7503 For this function to work, both the current newsgroup and the
7504 newsgroup that you want to move to have to support the `request-move'
7505 and `request-accept' functions.
7506
7507 ACTION can be either `move' (the default), `crosspost' or `copy'."
7508   (interactive "P")
7509   (unless action
7510     (setq action 'move))
7511   ;; Disable marking as read.
7512   (let (gnus-mark-article-hook)
7513     (save-window-excursion
7514       (gnus-summary-select-article)))
7515   ;; Check whether the source group supports the required functions.
7516   (cond ((and (eq action 'move)
7517               (not (gnus-check-backend-function
7518                     'request-move-article gnus-newsgroup-name)))
7519          (error "The current group does not support article moving"))
7520         ((and (eq action 'crosspost)
7521               (not (gnus-check-backend-function
7522                     'request-replace-article gnus-newsgroup-name)))
7523          (error "The current group does not support article editing")))
7524   (let ((articles (gnus-summary-work-articles n))
7525         (prefix (if (gnus-check-backend-function
7526                     'request-move-article gnus-newsgroup-name)
7527                     (gnus-group-real-prefix gnus-newsgroup-name)
7528                   ""))
7529         (names '((move "Move" "Moving")
7530                  (copy "Copy" "Copying")
7531                  (crosspost "Crosspost" "Crossposting")))
7532         (copy-buf (save-excursion
7533                     (nnheader-set-temp-buffer " *copy article*")))
7534         art-group to-method new-xref article to-groups)
7535     (unless (assq action names)
7536       (error "Unknown action %s" action))
7537     ;; Read the newsgroup name.
7538     (when (and (not to-newsgroup)
7539                (not select-method))
7540       (setq to-newsgroup
7541             (gnus-read-move-group-name
7542              (cadr (assq action names))
7543              (symbol-value (intern (format "gnus-current-%s-group" action)))
7544              articles prefix))
7545       (set (intern (format "gnus-current-%s-group" action)) to-newsgroup))
7546     (setq to-method (or select-method
7547                         (gnus-server-to-method
7548                          (gnus-group-method to-newsgroup))))
7549     ;; Check the method we are to move this article to...
7550     (unless (gnus-check-backend-function
7551              'request-accept-article (car to-method))
7552       (error "%s does not support article copying" (car to-method)))
7553     (unless (gnus-check-server to-method)
7554       (error "Can't open server %s" (car to-method)))
7555     (gnus-message 6 "%s to %s: %s..."
7556                   (caddr (assq action names))
7557                   (or (car select-method) to-newsgroup) articles)
7558     (while articles
7559       (setq article (pop articles))
7560       (setq
7561        art-group
7562        (cond
7563         ;; Move the article.
7564         ((eq action 'move)
7565          ;; Remove this article from future suppression.
7566          (gnus-dup-unsuppress-article article)
7567          (gnus-request-move-article
7568           article                       ; Article to move
7569           gnus-newsgroup-name           ; From newsgroup
7570           (nth 1 (gnus-find-method-for-group
7571                   gnus-newsgroup-name)) ; Server
7572           (list 'gnus-request-accept-article
7573                 to-newsgroup (list 'quote select-method)
7574                 (not articles) t)       ; Accept form
7575           (not articles)))              ; Only save nov last time
7576         ;; Copy the article.
7577         ((eq action 'copy)
7578          (save-excursion
7579            (set-buffer copy-buf)
7580            (when (gnus-request-article-this-buffer article gnus-newsgroup-name)
7581              (gnus-request-accept-article
7582               to-newsgroup select-method (not articles) t))))
7583         ;; Crosspost the article.
7584         ((eq action 'crosspost)
7585          (let ((xref (message-tokenize-header
7586                       (mail-header-xref (gnus-summary-article-header article))
7587                       " ")))
7588            (setq new-xref (concat (gnus-group-real-name gnus-newsgroup-name)
7589                                   ":" article))
7590            (unless xref
7591              (setq xref (list (system-name))))
7592            (setq new-xref
7593                  (concat
7594                   (mapconcat 'identity
7595                              (delete "Xref:" (delete new-xref xref))
7596                              " ")
7597                   " " new-xref))
7598            (save-excursion
7599              (set-buffer copy-buf)
7600              ;; First put the article in the destination group.
7601              (gnus-request-article-this-buffer article gnus-newsgroup-name)
7602              (when (consp (setq art-group
7603                                 (gnus-request-accept-article
7604                                  to-newsgroup select-method (not articles))))
7605                (setq new-xref (concat new-xref " " (car art-group)
7606                                       ":" (cdr art-group)))
7607                ;; Now we have the new Xrefs header, so we insert
7608                ;; it and replace the new article.
7609                (nnheader-replace-header "Xref" new-xref)
7610                (gnus-request-replace-article
7611                 (cdr art-group) to-newsgroup (current-buffer))
7612                art-group))))))
7613       (cond
7614        ((not art-group)
7615         (gnus-message 1 "Couldn't %s article %s: %s"
7616                       (cadr (assq action names)) article
7617                       (nnheader-get-report (car to-method))))
7618        ((eq art-group 'junk)
7619         (when (eq action 'move)
7620           (gnus-summary-mark-article article gnus-canceled-mark)
7621           (gnus-message 4 "Deleted article %s" article)))
7622        (t
7623         (let* ((pto-group (gnus-group-prefixed-name
7624                            (car art-group) to-method))
7625                (entry
7626                 (gnus-gethash pto-group gnus-newsrc-hashtb))
7627                (info (nth 2 entry))
7628                (to-group (gnus-info-group info))
7629                to-marks)
7630           ;; Update the group that has been moved to.
7631           (when (and info
7632                      (memq action '(move copy)))
7633             (unless (member to-group to-groups)
7634               (push to-group to-groups))
7635
7636             (unless (memq article gnus-newsgroup-unreads)
7637               (push 'read to-marks)
7638               (gnus-info-set-read
7639                info (gnus-add-to-range (gnus-info-read info)
7640                                        (list (cdr art-group)))))
7641
7642             ;; See whether the article is to be put in the cache.
7643             (let ((marks gnus-article-mark-lists)
7644                   (to-article (cdr art-group)))
7645
7646               ;; Enter the article into the cache in the new group,
7647               ;; if that is required.
7648               (when gnus-use-cache
7649                 (gnus-cache-possibly-enter-article
7650                  to-group to-article
7651                  (memq article gnus-newsgroup-marked)
7652                  (memq article gnus-newsgroup-dormant)
7653                  (memq article gnus-newsgroup-unreads)))
7654
7655               (when gnus-preserve-marks
7656                 ;; Copy any marks over to the new group.
7657                 (when (and (equal to-group gnus-newsgroup-name)
7658                            (not (memq article gnus-newsgroup-unreads)))
7659                   ;; Mark this article as read in this group.
7660                   (push (cons to-article gnus-read-mark) gnus-newsgroup-reads)
7661                   (setcdr (gnus-active to-group) to-article)
7662                   (setcdr gnus-newsgroup-active to-article))
7663
7664                 (while marks
7665                   (when (memq article (symbol-value
7666                                        (intern (format "gnus-newsgroup-%s"
7667                                                        (caar marks)))))
7668                     (push (cdar marks) to-marks)
7669                     ;; If the other group is the same as this group,
7670                     ;; then we have to add the mark to the list.
7671                     (when (equal to-group gnus-newsgroup-name)
7672                       (set (intern (format "gnus-newsgroup-%s" (caar marks)))
7673                            (cons to-article
7674                                  (symbol-value
7675                                   (intern (format "gnus-newsgroup-%s"
7676                                                   (caar marks)))))))
7677                     ;; Copy the marks to other group.
7678                     (gnus-add-marked-articles
7679                      to-group (cdar marks) (list to-article) info))
7680                   (setq marks (cdr marks)))
7681
7682                 (gnus-request-set-mark to-group (list (list (list to-article)
7683                                                             'set
7684                                                             to-marks))))
7685
7686               (gnus-dribble-enter
7687                (concat "(gnus-group-set-info '"
7688                        (gnus-prin1-to-string (gnus-get-info to-group))
7689                        ")"))))
7690
7691           ;; Update the Xref header in this article to point to
7692           ;; the new crossposted article we have just created.
7693           (when (eq action 'crosspost)
7694             (save-excursion
7695               (set-buffer copy-buf)
7696               (gnus-request-article-this-buffer article gnus-newsgroup-name)
7697               (nnheader-replace-header "Xref" new-xref)
7698               (gnus-request-replace-article
7699                article gnus-newsgroup-name (current-buffer)))))
7700
7701         ;;;!!!Why is this necessary?
7702         (set-buffer gnus-summary-buffer)
7703
7704         (gnus-summary-goto-subject article)
7705         (when (eq action 'move)
7706           (gnus-summary-mark-article article gnus-canceled-mark))))
7707       (gnus-summary-remove-process-mark article))
7708     ;; Re-activate all groups that have been moved to.
7709     (while to-groups
7710       (save-excursion
7711         (set-buffer gnus-group-buffer)
7712         (when (gnus-group-goto-group (car to-groups) t)
7713           (gnus-group-get-new-news-this-group 1 t))
7714         (pop to-groups)))
7715
7716     (gnus-kill-buffer copy-buf)
7717     (gnus-summary-position-point)
7718     (gnus-set-mode-line 'summary)))
7719
7720 (defun gnus-summary-copy-article (&optional n to-newsgroup select-method)
7721   "Move the current article to a different newsgroup.
7722 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to.
7723 If SELECT-METHOD is non-nil, do not move to a specific newsgroup, but
7724 re-spool using this method."
7725   (interactive "P")
7726   (gnus-summary-move-article n to-newsgroup select-method 'copy))
7727
7728 (defun gnus-summary-crosspost-article (&optional n)
7729   "Crosspost the current article to some other group."
7730   (interactive "P")
7731   (gnus-summary-move-article n nil nil 'crosspost))
7732
7733 (defcustom gnus-summary-respool-default-method nil
7734   "Default method for respooling an article.
7735 If nil, use to the current newsgroup method."
7736   :type '(choice (gnus-select-method :value (nnml ""))
7737                  (const nil))
7738   :group 'gnus-summary-mail)
7739
7740 (defun gnus-summary-respool-article (&optional n method)
7741   "Respool the current article.
7742 The article will be squeezed through the mail spooling process again,
7743 which means that it will be put in some mail newsgroup or other
7744 depending on `nnmail-split-methods'.
7745 If N is a positive number, respool the N next articles.
7746 If N is a negative number, respool the N previous articles.
7747 If N is nil and any articles have been marked with the process mark,
7748 respool those articles instead.
7749
7750 Respooling can be done both from mail groups and \"real\" newsgroups.
7751 In the former case, the articles in question will be moved from the
7752 current group into whatever groups they are destined to.  In the
7753 latter case, they will be copied into the relevant groups."
7754   (interactive
7755    (list current-prefix-arg
7756          (let* ((methods (gnus-methods-using 'respool))
7757                 (methname
7758                  (symbol-name (or gnus-summary-respool-default-method
7759                                   (car (gnus-find-method-for-group
7760                                         gnus-newsgroup-name)))))
7761                 (method
7762                  (gnus-completing-read
7763                   methname "What backend do you want to use when respooling?"
7764                   methods nil t nil 'gnus-mail-method-history))
7765                 ms)
7766            (cond
7767             ((zerop (length (setq ms (gnus-servers-using-backend
7768                                       (intern method)))))
7769              (list (intern method) ""))
7770             ((= 1 (length ms))
7771              (car ms))
7772             (t
7773              (let ((ms-alist (mapcar (lambda (m) (cons (cadr m) m)) ms)))
7774                (cdr (assoc (completing-read "Server name: " ms-alist nil t)
7775                            ms-alist))))))))
7776   (unless method
7777     (error "No method given for respooling"))
7778   (if (assoc (symbol-name
7779               (car (gnus-find-method-for-group gnus-newsgroup-name)))
7780              (gnus-methods-using 'respool))
7781       (gnus-summary-move-article n nil method)
7782     (gnus-summary-copy-article n nil method)))
7783
7784 (defun gnus-summary-import-article (file)
7785   "Import an arbitrary file into a mail newsgroup."
7786   (interactive "fImport file: ")
7787   (let ((group gnus-newsgroup-name)
7788         (now (current-time))
7789         atts lines)
7790     (unless (gnus-check-backend-function 'request-accept-article group)
7791       (error "%s does not support article importing" group))
7792     (or (file-readable-p file)
7793         (not (file-regular-p file))
7794         (error "Can't read %s" file))
7795     (save-excursion
7796       (set-buffer (gnus-get-buffer-create " *import file*"))
7797       (erase-buffer)
7798       (nnheader-insert-file-contents file)
7799       (goto-char (point-min))
7800       (unless (nnheader-article-p)
7801         ;; This doesn't look like an article, so we fudge some headers.
7802         (setq atts (file-attributes file)
7803               lines (count-lines (point-min) (point-max)))
7804         (insert "From: " (read-string "From: ") "\n"
7805                 "Subject: " (read-string "Subject: ") "\n"
7806                 "Date: " (message-make-date (nth 5 atts))
7807                 "\n"
7808                 "Message-ID: " (message-make-message-id) "\n"
7809                 "Lines: " (int-to-string lines) "\n"
7810                 "Chars: " (int-to-string (nth 7 atts)) "\n\n"))
7811       (gnus-request-accept-article group nil t)
7812       (kill-buffer (current-buffer)))))
7813
7814 (defun gnus-summary-article-posted-p ()
7815   "Say whether the current (mail) article is available from news as well.
7816 This will be the case if the article has both been mailed and posted."
7817   (interactive)
7818   (let ((id (mail-header-references (gnus-summary-article-header)))
7819         (gnus-override-method (car (gnus-refer-article-methods))))
7820     (if (gnus-request-head id "")
7821         (gnus-message 2 "The current message was found on %s"
7822                       gnus-override-method)
7823       (gnus-message 2 "The current message couldn't be found on %s"
7824                     gnus-override-method)
7825       nil)))
7826
7827 (defun gnus-summary-expire-articles (&optional now)
7828   "Expire all articles that are marked as expirable in the current group."
7829   (interactive)
7830   (when (gnus-check-backend-function
7831          'request-expire-articles gnus-newsgroup-name)
7832     ;; This backend supports expiry.
7833     (let* ((total (gnus-group-total-expirable-p gnus-newsgroup-name))
7834            (expirable (if total
7835                           (progn
7836                             ;; We need to update the info for
7837                             ;; this group for `gnus-list-of-read-articles'
7838                             ;; to give us the right answer.
7839                             (gnus-run-hooks 'gnus-exit-group-hook)
7840                             (gnus-summary-update-info)
7841                             (gnus-list-of-read-articles gnus-newsgroup-name))
7842                         (setq gnus-newsgroup-expirable
7843                               (sort gnus-newsgroup-expirable '<))))
7844            (expiry-wait (if now 'immediate
7845                           (gnus-group-find-parameter
7846                            gnus-newsgroup-name 'expiry-wait)))
7847            (nnmail-expiry-target
7848             (or (gnus-group-find-parameter gnus-newsgroup-name 'expiry-target)
7849                 nnmail-expiry-target))
7850            es)
7851       (when expirable
7852         ;; There are expirable articles in this group, so we run them
7853         ;; through the expiry process.
7854         (gnus-message 6 "Expiring articles...")
7855         (unless (gnus-check-group gnus-newsgroup-name)
7856           (error "Can't open server for %s" gnus-newsgroup-name))
7857         ;; The list of articles that weren't expired is returned.
7858         (save-excursion
7859           (if expiry-wait
7860               (let ((nnmail-expiry-wait-function nil)
7861                     (nnmail-expiry-wait expiry-wait))
7862                 (setq es (gnus-request-expire-articles
7863                           expirable gnus-newsgroup-name)))
7864             (setq es (gnus-request-expire-articles
7865                       expirable gnus-newsgroup-name))))
7866         (unless total
7867           (setq gnus-newsgroup-expirable es))
7868         ;; We go through the old list of expirable, and mark all
7869         ;; really expired articles as nonexistent.
7870         (unless (eq es expirable)       ;If nothing was expired, we don't mark.
7871           (let ((gnus-use-cache nil))
7872             (while expirable
7873               (unless (memq (car expirable) es)
7874                 (when (gnus-data-find (car expirable))
7875                   (gnus-summary-mark-article
7876                    (car expirable) gnus-canceled-mark)))
7877               (setq expirable (cdr expirable)))))
7878         (gnus-message 6 "Expiring articles...done")))))
7879
7880 (defun gnus-summary-expire-articles-now ()
7881   "Expunge all expirable articles in the current group.
7882 This means that *all* articles that are marked as expirable will be
7883 deleted forever, right now."
7884   (interactive)
7885   (or gnus-expert-user
7886       (gnus-yes-or-no-p
7887        "Are you really, really, really sure you want to delete all these messages? ")
7888       (error "Phew!"))
7889   (gnus-summary-expire-articles t))
7890
7891 ;; Suggested by Jack Vinson <vinson@unagi.cis.upenn.edu>.
7892 (defun gnus-summary-delete-article (&optional n)
7893   "Delete the N next (mail) articles.
7894 This command actually deletes articles.  This is not a marking
7895 command.  The article will disappear forever from your life, never to
7896 return.
7897 If N is negative, delete backwards.
7898 If N is nil and articles have been marked with the process mark,
7899 delete these instead."
7900   (interactive "P")
7901   (unless (gnus-check-backend-function 'request-expire-articles
7902                                        gnus-newsgroup-name)
7903     (error "The current newsgroup does not support article deletion"))
7904   (unless (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
7905     (error "Couldn't open server"))
7906   ;; Compute the list of articles to delete.
7907   (let ((articles (sort (copy-sequence (gnus-summary-work-articles n)) '<))
7908         not-deleted)
7909     (if (and gnus-novice-user
7910              (not (gnus-yes-or-no-p
7911                    (format "Do you really want to delete %s forever? "
7912                            (if (> (length articles) 1)
7913                                (format "these %s articles" (length articles))
7914                              "this article")))))
7915         ()
7916       ;; Delete the articles.
7917       (setq not-deleted (gnus-request-expire-articles
7918                          articles gnus-newsgroup-name 'force))
7919       (while articles
7920         (gnus-summary-remove-process-mark (car articles))
7921         ;; The backend might not have been able to delete the article
7922         ;; after all.
7923         (unless (memq (car articles) not-deleted)
7924           (gnus-summary-mark-article (car articles) gnus-canceled-mark))
7925         (setq articles (cdr articles)))
7926       (when not-deleted
7927         (gnus-message 4 "Couldn't delete articles %s" not-deleted)))
7928     (gnus-summary-position-point)
7929     (gnus-set-mode-line 'summary)
7930     not-deleted))
7931
7932 (defun gnus-summary-edit-article (&optional arg)
7933   "Edit the current article.
7934 This will have permanent effect only in mail groups.
7935 If ARG is nil, edit the decoded articles.
7936 If ARG is 1, edit the raw articles.
7937 If ARG is 2, edit the raw articles even in read-only groups.
7938 Otherwise, allow editing of articles even in read-only
7939 groups."
7940   (interactive "P")
7941   (let (force raw)
7942     (cond
7943      ((null arg))
7944      ((eq arg 1) (setq raw t))
7945      ((eq arg 2) (setq raw t
7946                        force t))
7947      (t (setq force t)))
7948     (if (and raw (not force) (equal gnus-newsgroup-name "nndraft:drafts"))
7949         (error "Can't edit the raw article in group nndraft:drafts"))
7950     (save-excursion
7951       (set-buffer gnus-summary-buffer)
7952       (let ((mail-parse-charset gnus-newsgroup-charset)
7953             (mail-parse-ignored-charsets gnus-newsgroup-ignored-charsets))
7954         (gnus-set-global-variables)
7955         (when (and (not force)
7956                    (gnus-group-read-only-p))
7957           (error "The current newsgroup does not support article editing"))
7958         (gnus-summary-show-article t)
7959         (when (and (not raw) (gnus-buffer-live-p gnus-article-buffer))
7960           (with-current-buffer gnus-article-buffer
7961             (mm-enable-multibyte-mule4)))
7962         (if (equal gnus-newsgroup-name "nndraft:drafts")
7963             (setq raw t))
7964         (gnus-article-edit-article
7965          (if raw 'ignore
7966            #'(lambda ()
7967                (let ((mbl mml-buffer-list))
7968                  (setq mml-buffer-list nil)
7969                  (mime-to-mml)
7970                  (make-local-hook 'kill-buffer-hook)
7971                  (let ((mml-buffer-list mml-buffer-list))
7972                    (setq mml-buffer-list mbl)
7973                    (make-local-variable 'mml-buffer-list))
7974                  (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))))
7975          `(lambda (no-highlight)
7976             (let ((mail-parse-charset ',gnus-newsgroup-charset)
7977                   (mail-parse-ignored-charsets
7978                    ',gnus-newsgroup-ignored-charsets))
7979               ,(if (not raw) '(progn
7980                                 (mml-to-mime)
7981                                 (mml-destroy-buffers)
7982                                 (remove-hook 'kill-buffer-hook
7983                                              'mml-destroy-buffers t)
7984                                 (kill-local-variable 'mml-buffer-list)))
7985               (gnus-summary-edit-article-done
7986                ,(or (mail-header-references gnus-current-headers) "")
7987                ,(gnus-group-read-only-p)
7988                ,gnus-summary-buffer no-highlight))))))))
7989
7990 (defalias 'gnus-summary-edit-article-postpone 'gnus-article-edit-exit)
7991
7992 (defun gnus-summary-edit-article-done (&optional references read-only buffer
7993                                                  no-highlight)
7994   "Make edits to the current article permanent."
7995   (interactive)
7996   ;; Replace the article.
7997   (let ((buf (current-buffer)))
7998     (with-temp-buffer
7999       (insert-buffer-substring buf)
8000       (if (and (not read-only)
8001                (not (gnus-request-replace-article
8002                      (cdr gnus-article-current) (car gnus-article-current)
8003                      (current-buffer) t)))
8004           (error "Couldn't replace article")
8005         ;; Update the summary buffer.
8006         (if (and references
8007                  (equal (message-tokenize-header references " ")
8008                         (message-tokenize-header
8009                          (or (message-fetch-field "references") "") " ")))
8010             ;; We only have to update this line.
8011             (save-excursion
8012               (save-restriction
8013                 (message-narrow-to-head)
8014                 (let ((head (buffer-string))
8015                       header)
8016                   (with-temp-buffer
8017                     (insert (format "211 %d Article retrieved.\n"
8018                                     (cdr gnus-article-current)))
8019                     (insert head)
8020                     (insert ".\n")
8021                     (let ((nntp-server-buffer (current-buffer)))
8022                       (setq header (car (gnus-get-newsgroup-headers
8023                                          (save-excursion
8024                                            (set-buffer gnus-summary-buffer)
8025                                            gnus-newsgroup-dependencies)
8026                                          t))))
8027                     (save-excursion
8028                       (set-buffer gnus-summary-buffer)
8029                       (gnus-data-set-header
8030                        (gnus-data-find (cdr gnus-article-current))
8031                        header)
8032                       (gnus-summary-update-article-line
8033                        (cdr gnus-article-current) header))))))
8034           ;; Update threads.
8035           (set-buffer (or buffer gnus-summary-buffer))
8036           (gnus-summary-update-article (cdr gnus-article-current)))
8037         ;; Prettify the article buffer again.
8038         (unless no-highlight
8039           (save-excursion
8040             (set-buffer gnus-article-buffer)
8041             ;;;!!! Fix this -- article should be rehighlighted.
8042             ;;;(gnus-run-hooks 'gnus-article-display-hook)
8043             (set-buffer gnus-original-article-buffer)
8044             (gnus-request-article
8045              (cdr gnus-article-current)
8046              (car gnus-article-current) (current-buffer))))
8047         ;; Prettify the summary buffer line.
8048         (when (gnus-visual-p 'summary-highlight 'highlight)
8049           (gnus-run-hooks 'gnus-visual-mark-article-hook))))))
8050
8051 (defun gnus-summary-edit-wash (key)
8052   "Perform editing command KEY in the article buffer."
8053   (interactive
8054    (list
8055     (progn
8056       (message "%s" (concat (this-command-keys) "- "))
8057       (read-char))))
8058   (message "")
8059   (gnus-summary-edit-article)
8060   (execute-kbd-macro (concat (this-command-keys) key))
8061   (gnus-article-edit-done))
8062
8063 ;;; Respooling
8064
8065 (defun gnus-summary-respool-query (&optional silent trace)
8066   "Query where the respool algorithm would put this article."
8067   (interactive)
8068   (let (gnus-mark-article-hook)
8069     (gnus-summary-select-article)
8070     (save-excursion
8071       (set-buffer gnus-original-article-buffer)
8072       (save-restriction
8073         (message-narrow-to-head)
8074         (let ((groups (nnmail-article-group 'identity trace)))
8075           (unless silent
8076             (if groups
8077                 (message "This message would go to %s"
8078                          (mapconcat 'car groups ", "))
8079               (message "This message would go to no groups"))
8080             groups))))))
8081
8082 (defun gnus-summary-respool-trace ()
8083   "Trace where the respool algorithm would put this article.
8084 Display a buffer showing all fancy splitting patterns which matched."
8085   (interactive)
8086   (gnus-summary-respool-query nil t))
8087
8088 ;; Summary marking commands.
8089
8090 (defun gnus-summary-kill-same-subject-and-select (&optional unmark)
8091   "Mark articles which has the same subject as read, and then select the next.
8092 If UNMARK is positive, remove any kind of mark.
8093 If UNMARK is negative, tick articles."
8094   (interactive "P")
8095   (when unmark
8096     (setq unmark (prefix-numeric-value unmark)))
8097   (let ((count
8098          (gnus-summary-mark-same-subject
8099           (gnus-summary-article-subject) unmark)))
8100     ;; Select next unread article.  If auto-select-same mode, should
8101     ;; select the first unread article.
8102     (gnus-summary-next-article t (and gnus-auto-select-same
8103                                       (gnus-summary-article-subject)))
8104     (gnus-message 7 "%d article%s marked as %s"
8105                   count (if (= count 1) " is" "s are")
8106                   (if unmark "unread" "read"))))
8107
8108 (defun gnus-summary-kill-same-subject (&optional unmark)
8109   "Mark articles which has the same subject as read.
8110 If UNMARK is positive, remove any kind of mark.
8111 If UNMARK is negative, tick articles."
8112   (interactive "P")
8113   (when unmark
8114     (setq unmark (prefix-numeric-value unmark)))
8115   (let ((count
8116          (gnus-summary-mark-same-subject
8117           (gnus-summary-article-subject) unmark)))
8118     ;; If marked as read, go to next unread subject.
8119     (when (null unmark)
8120       ;; Go to next unread subject.
8121       (gnus-summary-next-subject 1 t))
8122     (gnus-message 7 "%d articles are marked as %s"
8123                   count (if unmark "unread" "read"))))
8124
8125 (defun gnus-summary-mark-same-subject (subject &optional unmark)
8126   "Mark articles with same SUBJECT as read, and return marked number.
8127 If optional argument UNMARK is positive, remove any kinds of marks.
8128 If optional argument UNMARK is negative, mark articles as unread instead."
8129   (let ((count 1))
8130     (save-excursion
8131       (cond
8132        ((null unmark)                   ; Mark as read.
8133         (while (and
8134                 (progn
8135                   (gnus-summary-mark-article-as-read gnus-killed-mark)
8136                   (gnus-summary-show-thread) t)
8137                 (gnus-summary-find-subject subject))
8138           (setq count (1+ count))))
8139        ((> unmark 0)                    ; Tick.
8140         (while (and
8141                 (progn
8142                   (gnus-summary-mark-article-as-unread gnus-ticked-mark)
8143                   (gnus-summary-show-thread) t)
8144                 (gnus-summary-find-subject subject))
8145           (setq count (1+ count))))
8146        (t                               ; Mark as unread.
8147         (while (and
8148                 (progn
8149                   (gnus-summary-mark-article-as-unread gnus-unread-mark)
8150                   (gnus-summary-show-thread) t)
8151                 (gnus-summary-find-subject subject))
8152           (setq count (1+ count)))))
8153       (gnus-set-mode-line 'summary)
8154       ;; Return the number of marked articles.
8155       count)))
8156
8157 (defun gnus-summary-mark-as-processable (n &optional unmark)
8158   "Set the process mark on the next N articles.
8159 If N is negative, mark backward instead.  If UNMARK is non-nil, remove
8160 the process mark instead.  The difference between N and the actual
8161 number of articles marked is returned."
8162   (interactive "p")
8163   (let ((backward (< n 0))
8164         (n (abs n)))
8165     (while (and
8166             (> n 0)
8167             (if unmark
8168                 (gnus-summary-remove-process-mark
8169                  (gnus-summary-article-number))
8170               (gnus-summary-set-process-mark (gnus-summary-article-number)))
8171             (zerop (gnus-summary-next-subject (if backward -1 1) nil t)))
8172       (setq n (1- n)))
8173     (when (/= 0 n)
8174       (gnus-message 7 "No more articles"))
8175     (gnus-summary-recenter)
8176     (gnus-summary-position-point)
8177     n))
8178
8179 (defun gnus-summary-unmark-as-processable (n)
8180   "Remove the process mark from the next N articles.
8181 If N is negative, unmark backward instead.  The difference between N and
8182 the actual number of articles unmarked is returned."
8183   (interactive "p")
8184   (gnus-summary-mark-as-processable n t))
8185
8186 (defun gnus-summary-unmark-all-processable ()
8187   "Remove the process mark from all articles."
8188   (interactive)
8189   (save-excursion
8190     (while gnus-newsgroup-processable
8191       (gnus-summary-remove-process-mark (car gnus-newsgroup-processable))))
8192   (gnus-summary-position-point))
8193
8194 (defun gnus-summary-mark-as-expirable (n)
8195   "Mark N articles forward as expirable.
8196 If N is negative, mark backward instead.  The difference between N and
8197 the actual number of articles marked is returned."
8198   (interactive "p")
8199   (gnus-summary-mark-forward n gnus-expirable-mark))
8200
8201 (defun gnus-summary-mark-article-as-replied (article)
8202   "Mark ARTICLE replied and update the summary line."
8203   (push article gnus-newsgroup-replied)
8204   (let ((buffer-read-only nil))
8205     (when (gnus-summary-goto-subject article nil t)
8206       (gnus-summary-update-secondary-mark article))))
8207
8208 (defun gnus-summary-set-bookmark (article)
8209   "Set a bookmark in current article."
8210   (interactive (list (gnus-summary-article-number)))
8211   (when (or (not (get-buffer gnus-article-buffer))
8212             (not gnus-current-article)
8213             (not gnus-article-current)
8214             (not (equal gnus-newsgroup-name (car gnus-article-current))))
8215     (error "No current article selected"))
8216   ;; Remove old bookmark, if one exists.
8217   (let ((old (assq article gnus-newsgroup-bookmarks)))
8218     (when old
8219       (setq gnus-newsgroup-bookmarks
8220             (delq old gnus-newsgroup-bookmarks))))
8221   ;; Set the new bookmark, which is on the form
8222   ;; (article-number . line-number-in-body).
8223   (push
8224    (cons article
8225          (save-excursion
8226            (set-buffer gnus-article-buffer)
8227            (count-lines
8228             (min (point)
8229                  (save-excursion
8230                    (goto-char (point-min))
8231                    (search-forward "\n\n" nil t)
8232                    (point)))
8233             (point))))
8234    gnus-newsgroup-bookmarks)
8235   (gnus-message 6 "A bookmark has been added to the current article."))
8236
8237 (defun gnus-summary-remove-bookmark (article)
8238   "Remove the bookmark from the current article."
8239   (interactive (list (gnus-summary-article-number)))
8240   ;; Remove old bookmark, if one exists.
8241   (let ((old (assq article gnus-newsgroup-bookmarks)))
8242     (if old
8243         (progn
8244           (setq gnus-newsgroup-bookmarks
8245                 (delq old gnus-newsgroup-bookmarks))
8246           (gnus-message 6 "Removed bookmark."))
8247       (gnus-message 6 "No bookmark in current article."))))
8248
8249 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
8250 (defun gnus-summary-mark-as-dormant (n)
8251   "Mark N articles forward as dormant.
8252 If N is negative, mark backward instead.  The difference between N and
8253 the actual number of articles marked is returned."
8254   (interactive "p")
8255   (gnus-summary-mark-forward n gnus-dormant-mark))
8256
8257 (defun gnus-summary-set-process-mark (article)
8258   "Set the process mark on ARTICLE and update the summary line."
8259   (setq gnus-newsgroup-processable
8260         (cons article
8261               (delq article gnus-newsgroup-processable)))
8262   (when (gnus-summary-goto-subject article)
8263     (gnus-summary-show-thread)
8264     (gnus-summary-goto-subject article)
8265     (gnus-summary-update-secondary-mark article)))
8266
8267 (defun gnus-summary-remove-process-mark (article)
8268   "Remove the process mark from ARTICLE and update the summary line."
8269   (setq gnus-newsgroup-processable (delq article gnus-newsgroup-processable))
8270   (when (gnus-summary-goto-subject article)
8271     (gnus-summary-show-thread)
8272     (gnus-summary-goto-subject article)
8273     (gnus-summary-update-secondary-mark article)))
8274
8275 (defun gnus-summary-set-saved-mark (article)
8276   "Set the process mark on ARTICLE and update the summary line."
8277   (push article gnus-newsgroup-saved)
8278   (when (gnus-summary-goto-subject article)
8279     (gnus-summary-update-secondary-mark article)))
8280
8281 (defun gnus-summary-mark-forward (n &optional mark no-expire)
8282   "Mark N articles as read forwards.
8283 If N is negative, mark backwards instead.  Mark with MARK, ?r by default.
8284 The difference between N and the actual number of articles marked is
8285 returned.
8286 Iff NO-EXPIRE, auto-expiry will be inhibited."
8287   (interactive "p")
8288   (gnus-summary-show-thread)
8289   (let ((backward (< n 0))
8290         (gnus-summary-goto-unread
8291          (and gnus-summary-goto-unread
8292               (not (eq gnus-summary-goto-unread 'never))
8293               (not (memq mark (list gnus-unread-mark
8294                                     gnus-ticked-mark gnus-dormant-mark)))))
8295         (n (abs n))
8296         (mark (or mark gnus-del-mark)))
8297     (while (and (> n 0)
8298                 (gnus-summary-mark-article nil mark no-expire)
8299                 (zerop (gnus-summary-next-subject
8300                         (if backward -1 1)
8301                         (and gnus-summary-goto-unread
8302                              (not (eq gnus-summary-goto-unread 'never)))
8303                         t)))
8304       (setq n (1- n)))
8305     (when (/= 0 n)
8306       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
8307     (gnus-summary-recenter)
8308     (gnus-summary-position-point)
8309     (gnus-set-mode-line 'summary)
8310     n))
8311
8312 (defun gnus-summary-mark-article-as-read (mark)
8313   "Mark the current article quickly as read with MARK."
8314   (let ((article (gnus-summary-article-number)))
8315     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
8316     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
8317     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
8318     (push (cons article mark) gnus-newsgroup-reads)
8319     ;; Possibly remove from cache, if that is used.
8320     (when gnus-use-cache
8321       (gnus-cache-enter-remove-article article))
8322     ;; Allow the backend to change the mark.
8323     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8324     ;; Check for auto-expiry.
8325     (when (and gnus-newsgroup-auto-expire
8326                (memq mark gnus-auto-expirable-marks))
8327       (setq mark gnus-expirable-mark)
8328       ;; Let the backend know about the mark change.
8329       (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8330       (push article gnus-newsgroup-expirable))
8331     ;; Set the mark in the buffer.
8332     (gnus-summary-update-mark mark 'unread)
8333     t))
8334
8335 (defun gnus-summary-mark-article-as-unread (mark)
8336   "Mark the current article quickly as unread with MARK."
8337   (let* ((article (gnus-summary-article-number))
8338          (old-mark (gnus-summary-article-mark article)))
8339     ;; Allow the backend to change the mark.
8340     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8341     (if (eq mark old-mark)
8342         t
8343       (if (<= article 0)
8344           (progn
8345             (gnus-error 1 "Can't mark negative article numbers")
8346             nil)
8347         (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
8348         (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
8349         (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable))
8350         (setq gnus-newsgroup-reads (delq article gnus-newsgroup-reads))
8351         (cond ((= mark gnus-ticked-mark)
8352                (push article gnus-newsgroup-marked))
8353               ((= mark gnus-dormant-mark)
8354                (push article gnus-newsgroup-dormant))
8355               (t
8356                (push article gnus-newsgroup-unreads)))
8357         (gnus-pull article gnus-newsgroup-reads)
8358
8359         ;; See whether the article is to be put in the cache.
8360         (and gnus-use-cache
8361              (vectorp (gnus-summary-article-header article))
8362              (save-excursion
8363                (gnus-cache-possibly-enter-article
8364                 gnus-newsgroup-name article
8365                 (= mark gnus-ticked-mark)
8366                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
8367
8368         ;; Fix the mark.
8369         (gnus-summary-update-mark mark 'unread)
8370         t))))
8371
8372 (defun gnus-summary-mark-article (&optional article mark no-expire)
8373   "Mark ARTICLE with MARK.  MARK can be any character.
8374 Four MARK strings are reserved: `? ' (unread), `?!' (ticked),
8375 `??' (dormant) and `?E' (expirable).
8376 If MARK is nil, then the default character `?r' is used.
8377 If ARTICLE is nil, then the article on the current line will be
8378 marked.
8379 Iff NO-EXPIRE, auto-expiry will be inhibited."
8380   ;; The mark might be a string.
8381   (when (stringp mark)
8382     (setq mark (aref mark 0)))
8383   ;; If no mark is given, then we check auto-expiring.
8384   (when (null mark)
8385     (setq mark gnus-del-mark))
8386   (when (and (not no-expire)
8387              gnus-newsgroup-auto-expire
8388              (memq mark gnus-auto-expirable-marks))
8389     (setq mark gnus-expirable-mark))
8390   (let ((article (or article (gnus-summary-article-number)))
8391         (old-mark (gnus-summary-article-mark article)))
8392     ;; Allow the backend to change the mark.
8393     (setq mark (gnus-request-update-mark gnus-newsgroup-name article mark))
8394     (if (eq mark old-mark)
8395         t
8396       (unless article
8397         (error "No article on current line"))
8398       (if (not (if (or (= mark gnus-unread-mark)
8399                        (= mark gnus-ticked-mark)
8400                        (= mark gnus-dormant-mark))
8401                    (gnus-mark-article-as-unread article mark)
8402                  (gnus-mark-article-as-read article mark)))
8403           t
8404         ;; See whether the article is to be put in the cache.
8405         (and gnus-use-cache
8406              (not (= mark gnus-canceled-mark))
8407              (vectorp (gnus-summary-article-header article))
8408              (save-excursion
8409                (gnus-cache-possibly-enter-article
8410                 gnus-newsgroup-name article
8411                 (= mark gnus-ticked-mark)
8412                 (= mark gnus-dormant-mark) (= mark gnus-unread-mark))))
8413
8414         (when (gnus-summary-goto-subject article nil t)
8415           (let ((buffer-read-only nil))
8416             (gnus-summary-show-thread)
8417             ;; Fix the mark.
8418             (gnus-summary-update-mark mark 'unread)
8419             t))))))
8420
8421 (defun gnus-summary-update-secondary-mark (article)
8422   "Update the secondary (read, process, cache) mark."
8423   (gnus-summary-update-mark
8424    (cond ((memq article gnus-newsgroup-processable)
8425           gnus-process-mark)
8426          ((memq article gnus-newsgroup-cached)
8427           gnus-cached-mark)
8428          ((memq article gnus-newsgroup-replied)
8429           gnus-replied-mark)
8430          ((memq article gnus-newsgroup-saved)
8431           gnus-saved-mark)
8432          (t gnus-unread-mark))
8433    'replied)
8434   (when (gnus-visual-p 'summary-highlight 'highlight)
8435     (gnus-run-hooks 'gnus-summary-update-hook))
8436   t)
8437
8438 (defun gnus-summary-update-mark (mark type)
8439   (let ((forward (cdr (assq type gnus-summary-mark-positions)))
8440         (buffer-read-only nil))
8441     (re-search-backward "[\n\r]" (gnus-point-at-bol) 'move-to-limit)
8442     (when forward
8443       (when (looking-at "\r")
8444         (incf forward))
8445       (when (<= (+ forward (point)) (point-max))
8446         ;; Go to the right position on the line.
8447         (goto-char (+ forward (point)))
8448         ;; Replace the old mark with the new mark.
8449         (subst-char-in-region (point) (1+ (point)) (char-after) mark)
8450         ;; Optionally update the marks by some user rule.
8451         (when (eq type 'unread)
8452           (gnus-data-set-mark
8453            (gnus-data-find (gnus-summary-article-number)) mark)
8454           (gnus-summary-update-line (eq mark gnus-unread-mark)))))))
8455
8456 (defun gnus-mark-article-as-read (article &optional mark)
8457   "Enter ARTICLE in the pertinent lists and remove it from others."
8458   ;; Make the article expirable.
8459   (let ((mark (or mark gnus-del-mark)))
8460     (if (= mark gnus-expirable-mark)
8461         (push article gnus-newsgroup-expirable)
8462       (setq gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)))
8463     ;; Remove from unread and marked lists.
8464     (setq gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
8465     (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
8466     (setq gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant))
8467     (push (cons article mark) gnus-newsgroup-reads)
8468     ;; Possibly remove from cache, if that is used.
8469     (when gnus-use-cache
8470       (gnus-cache-enter-remove-article article))
8471     t))
8472
8473 (defun gnus-mark-article-as-unread (article &optional mark)
8474   "Enter ARTICLE in the pertinent lists and remove it from others."
8475   (let ((mark (or mark gnus-ticked-mark)))
8476     (if (<= article 0)
8477         (progn
8478           (gnus-error 1 "Can't mark negative article numbers")
8479           nil)
8480       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
8481             gnus-newsgroup-dormant (delq article gnus-newsgroup-dormant)
8482             gnus-newsgroup-expirable (delq article gnus-newsgroup-expirable)
8483             gnus-newsgroup-unreads (delq article gnus-newsgroup-unreads))
8484
8485       ;; Unsuppress duplicates?
8486       (when gnus-suppress-duplicates
8487         (gnus-dup-unsuppress-article article))
8488
8489       (cond ((= mark gnus-ticked-mark)
8490              (push article gnus-newsgroup-marked))
8491             ((= mark gnus-dormant-mark)
8492              (push article gnus-newsgroup-dormant))
8493             (t
8494              (push article gnus-newsgroup-unreads)))
8495       (gnus-pull article gnus-newsgroup-reads)
8496       t)))
8497
8498 (defalias 'gnus-summary-mark-as-unread-forward
8499   'gnus-summary-tick-article-forward)
8500 (make-obsolete 'gnus-summary-mark-as-unread-forward
8501                'gnus-summary-tick-article-forward)
8502 (defun gnus-summary-tick-article-forward (n)
8503   "Tick N articles forwards.
8504 If N is negative, tick backwards instead.
8505 The difference between N and the number of articles ticked is returned."
8506   (interactive "p")
8507   (gnus-summary-mark-forward n gnus-ticked-mark))
8508
8509 (defalias 'gnus-summary-mark-as-unread-backward
8510   'gnus-summary-tick-article-backward)
8511 (make-obsolete 'gnus-summary-mark-as-unread-backward
8512                'gnus-summary-tick-article-backward)
8513 (defun gnus-summary-tick-article-backward (n)
8514   "Tick N articles backwards.
8515 The difference between N and the number of articles ticked is returned."
8516   (interactive "p")
8517   (gnus-summary-mark-forward (- n) gnus-ticked-mark))
8518
8519 (defalias 'gnus-summary-mark-as-unread 'gnus-summary-tick-article)
8520 (make-obsolete 'gnus-summary-mark-as-unread 'gnus-summary-tick-article)
8521 (defun gnus-summary-tick-article (&optional article clear-mark)
8522   "Mark current article as unread.
8523 Optional 1st argument ARTICLE specifies article number to be marked as unread.
8524 Optional 2nd argument CLEAR-MARK remove any kinds of mark."
8525   (interactive)
8526   (gnus-summary-mark-article article (if clear-mark gnus-unread-mark
8527                                        gnus-ticked-mark)))
8528
8529 (defun gnus-summary-mark-as-read-forward (n)
8530   "Mark N articles as read forwards.
8531 If N is negative, mark backwards instead.
8532 The difference between N and the actual number of articles marked is
8533 returned."
8534   (interactive "p")
8535   (gnus-summary-mark-forward n gnus-del-mark gnus-inhibit-user-auto-expire))
8536
8537 (defun gnus-summary-mark-as-read-backward (n)
8538   "Mark the N articles as read backwards.
8539 The difference between N and the actual number of articles marked is
8540 returned."
8541   (interactive "p")
8542   (gnus-summary-mark-forward
8543    (- n) gnus-del-mark gnus-inhibit-user-auto-expire))
8544
8545 (defun gnus-summary-mark-as-read (&optional article mark)
8546   "Mark current article as read.
8547 ARTICLE specifies the article to be marked as read.
8548 MARK specifies a string to be inserted at the beginning of the line."
8549   (gnus-summary-mark-article article mark))
8550
8551 (defun gnus-summary-clear-mark-forward (n)
8552   "Clear marks from N articles forward.
8553 If N is negative, clear backward instead.
8554 The difference between N and the number of marks cleared is returned."
8555   (interactive "p")
8556   (gnus-summary-mark-forward n gnus-unread-mark))
8557
8558 (defun gnus-summary-clear-mark-backward (n)
8559   "Clear marks from N articles backward.
8560 The difference between N and the number of marks cleared is returned."
8561   (interactive "p")
8562   (gnus-summary-mark-forward (- n) gnus-unread-mark))
8563
8564 (defun gnus-summary-mark-unread-as-read ()
8565   "Intended to be used by `gnus-summary-mark-article-hook'."
8566   (when (memq gnus-current-article gnus-newsgroup-unreads)
8567     (gnus-summary-mark-article gnus-current-article gnus-read-mark)))
8568
8569 (defun gnus-summary-mark-read-and-unread-as-read ()
8570   "Intended to be used by `gnus-summary-mark-article-hook'."
8571   (let ((mark (gnus-summary-article-mark)))
8572     (when (or (gnus-unread-mark-p mark)
8573               (gnus-read-mark-p mark))
8574       (gnus-summary-mark-article gnus-current-article gnus-read-mark))))
8575
8576 (defun gnus-summary-mark-region-as-read (point mark all)
8577   "Mark all unread articles between point and mark as read.
8578 If given a prefix, mark all articles between point and mark as read,
8579 even ticked and dormant ones."
8580   (interactive "r\nP")
8581   (save-excursion
8582     (let (article)
8583       (goto-char point)
8584       (beginning-of-line)
8585       (while (and
8586               (< (point) mark)
8587               (progn
8588                 (when (or all
8589                           (memq (setq article (gnus-summary-article-number))
8590                                 gnus-newsgroup-unreads))
8591                   (gnus-summary-mark-article article gnus-del-mark))
8592                 t)
8593               (gnus-summary-find-next))))))
8594
8595 (defun gnus-summary-mark-below (score mark)
8596   "Mark articles with score less than SCORE with MARK."
8597   (interactive "P\ncMark: ")
8598   (setq score (if score
8599                   (prefix-numeric-value score)
8600                 (or gnus-summary-default-score 0)))
8601   (save-excursion
8602     (set-buffer gnus-summary-buffer)
8603     (goto-char (point-min))
8604     (while
8605         (progn
8606           (and (< (gnus-summary-article-score) score)
8607                (gnus-summary-mark-article nil mark))
8608           (gnus-summary-find-next)))))
8609
8610 (defun gnus-summary-kill-below (&optional score)
8611   "Mark articles with score below SCORE as read."
8612   (interactive "P")
8613   (gnus-summary-mark-below score gnus-killed-mark))
8614
8615 (defun gnus-summary-clear-above (&optional score)
8616   "Clear all marks from articles with score above SCORE."
8617   (interactive "P")
8618   (gnus-summary-mark-above score gnus-unread-mark))
8619
8620 (defun gnus-summary-tick-above (&optional score)
8621   "Tick all articles with score above SCORE."
8622   (interactive "P")
8623   (gnus-summary-mark-above score gnus-ticked-mark))
8624
8625 (defun gnus-summary-mark-above (score mark)
8626   "Mark articles with score over SCORE with MARK."
8627   (interactive "P\ncMark: ")
8628   (setq score (if score
8629                   (prefix-numeric-value score)
8630                 (or gnus-summary-default-score 0)))
8631   (save-excursion
8632     (set-buffer gnus-summary-buffer)
8633     (goto-char (point-min))
8634     (while (and (progn
8635                   (when (> (gnus-summary-article-score) score)
8636                     (gnus-summary-mark-article nil mark))
8637                   t)
8638                 (gnus-summary-find-next)))))
8639
8640 ;; Suggested by Daniel Quinlan <quinlan@best.com>.
8641 (defalias 'gnus-summary-show-all-expunged 'gnus-summary-limit-include-expunged)
8642 (defun gnus-summary-limit-include-expunged (&optional no-error)
8643   "Display all the hidden articles that were expunged for low scores."
8644   (interactive)
8645   (let ((buffer-read-only nil))
8646     (let ((scored gnus-newsgroup-scored)
8647           headers h)
8648       (while scored
8649         (unless (gnus-summary-goto-subject (caar scored))
8650           (and (setq h (gnus-summary-article-header (caar scored)))
8651                (< (cdar scored) gnus-summary-expunge-below)
8652                (push h headers)))
8653         (setq scored (cdr scored)))
8654       (if (not headers)
8655           (when (not no-error)
8656             (error "No expunged articles hidden"))
8657         (goto-char (point-min))
8658         (gnus-summary-prepare-unthreaded (nreverse headers))
8659         (goto-char (point-min))
8660         (gnus-summary-position-point)
8661         t))))
8662
8663 (defun gnus-summary-catchup (&optional all quietly to-here not-mark)
8664   "Mark all unread articles in this newsgroup as read.
8665 If prefix argument ALL is non-nil, ticked and dormant articles will
8666 also be marked as read.
8667 If QUIETLY is non-nil, no questions will be asked.
8668 If TO-HERE is non-nil, it should be a point in the buffer.  All
8669 articles before this point will be marked as read.
8670 Note that this function will only catch up the unread article
8671 in the current summary buffer limitation.
8672 The number of articles marked as read is returned."
8673   (interactive "P")
8674   (prog1
8675       (save-excursion
8676         (when (or quietly
8677                   (not gnus-interactive-catchup) ;Without confirmation?
8678                   gnus-expert-user
8679                   (gnus-y-or-n-p
8680                    (if all
8681                        "Mark absolutely all articles as read? "
8682                      "Mark all unread articles as read? ")))
8683           (if (and not-mark
8684                    (not gnus-newsgroup-adaptive)
8685                    (not gnus-newsgroup-auto-expire)
8686                    (not gnus-suppress-duplicates)
8687                    (or (not gnus-use-cache)
8688                        (eq gnus-use-cache 'passive)))
8689               (progn
8690                 (when all
8691                   (setq gnus-newsgroup-marked nil
8692                         gnus-newsgroup-dormant nil))
8693                 (setq gnus-newsgroup-unreads gnus-newsgroup-downloadable))
8694             ;; We actually mark all articles as canceled, which we
8695             ;; have to do when using auto-expiry or adaptive scoring.
8696             (gnus-summary-show-all-threads)
8697             (when (gnus-summary-first-subject (not all) t)
8698               (while (and
8699                       (if to-here (< (point) to-here) t)
8700                       (gnus-summary-mark-article-as-read gnus-catchup-mark)
8701                       (gnus-summary-find-next (not all) nil nil t))))
8702             (gnus-set-mode-line 'summary))
8703           t))
8704     (gnus-summary-position-point)))
8705
8706 (defun gnus-summary-catchup-to-here (&optional all)
8707   "Mark all unticked articles before the current one as read.
8708 If ALL is non-nil, also mark ticked and dormant articles as read."
8709   (interactive "P")
8710   (save-excursion
8711     (gnus-save-hidden-threads
8712       (let ((beg (point)))
8713         ;; We check that there are unread articles.
8714         (when (or all (gnus-summary-find-prev))
8715           (gnus-summary-catchup all t beg)))))
8716   (gnus-summary-position-point))
8717
8718 (defun gnus-summary-catchup-all (&optional quietly)
8719   "Mark all articles in this newsgroup as read."
8720   (interactive "P")
8721   (gnus-summary-catchup t quietly))
8722
8723 (defun gnus-summary-catchup-and-exit (&optional all quietly)
8724   "Mark all unread articles in this group as read, then exit.
8725 If prefix argument ALL is non-nil, all articles are marked as read."
8726   (interactive "P")
8727   (when (gnus-summary-catchup all quietly nil 'fast)
8728     ;; Select next newsgroup or exit.
8729     (if (and (not (gnus-group-quit-config gnus-newsgroup-name))
8730              (eq gnus-auto-select-next 'quietly))
8731         (gnus-summary-next-group nil)
8732       (gnus-summary-exit))))
8733
8734 (defun gnus-summary-catchup-all-and-exit (&optional quietly)
8735   "Mark all articles in this newsgroup as read, and then exit."
8736   (interactive "P")
8737   (gnus-summary-catchup-and-exit t quietly))
8738
8739 (defun gnus-summary-catchup-and-goto-next-group (&optional all)
8740   "Mark all articles in this group as read and select the next group.
8741 If given a prefix, mark all articles, unread as well as ticked, as
8742 read."
8743   (interactive "P")
8744   (save-excursion
8745     (gnus-summary-catchup all))
8746   (gnus-summary-next-group))
8747
8748 ;;;
8749 ;;; with article
8750 ;;;
8751
8752 (defmacro gnus-with-article (article &rest forms)
8753   "Select ARTICLE and perform FORMS in the original article buffer.
8754 Then replace the article with the result."
8755   `(progn
8756      ;; We don't want the article to be marked as read.
8757      (let (gnus-mark-article-hook)
8758        (gnus-summary-select-article t t nil ,article))
8759      (set-buffer gnus-original-article-buffer)
8760      ,@forms
8761      (if (not (gnus-check-backend-function
8762                'request-replace-article (car gnus-article-current)))
8763          (gnus-message 5 "Read-only group; not replacing")
8764        (unless (gnus-request-replace-article
8765                 ,article (car gnus-article-current)
8766                 (current-buffer) t)
8767          (error "Couldn't replace article")))
8768      ;; The cache and backlog have to be flushed somewhat.
8769      (when gnus-keep-backlog
8770        (gnus-backlog-remove-article
8771         (car gnus-article-current) (cdr gnus-article-current)))
8772      (when gnus-use-cache
8773        (gnus-cache-update-article
8774         (car gnus-article-current) (cdr gnus-article-current)))))
8775
8776 (put 'gnus-with-article 'lisp-indent-function 1)
8777 (put 'gnus-with-article 'edebug-form-spec '(form body))
8778
8779 ;; Thread-based commands.
8780
8781 (defun gnus-summary-articles-in-thread (&optional article)
8782   "Return a list of all articles in the current thread.
8783 If ARTICLE is non-nil, return all articles in the thread that starts
8784 with that article."
8785   (let* ((article (or article (gnus-summary-article-number)))
8786          (data (gnus-data-find-list article))
8787          (top-level (gnus-data-level (car data)))
8788          (top-subject
8789           (cond ((null gnus-thread-operation-ignore-subject)
8790                  (gnus-simplify-subject-re
8791                   (mail-header-subject (gnus-data-header (car data)))))
8792                 ((eq gnus-thread-operation-ignore-subject 'fuzzy)
8793                  (gnus-simplify-subject-fuzzy
8794                   (mail-header-subject (gnus-data-header (car data)))))
8795                 (t nil)))
8796          (end-point (save-excursion
8797                       (if (gnus-summary-go-to-next-thread)
8798                           (point) (point-max))))
8799          articles)
8800     (while (and data
8801                 (< (gnus-data-pos (car data)) end-point))
8802       (when (or (not top-subject)
8803                 (string= top-subject
8804                          (if (eq gnus-thread-operation-ignore-subject 'fuzzy)
8805                              (gnus-simplify-subject-fuzzy
8806                               (mail-header-subject
8807                                (gnus-data-header (car data))))
8808                            (gnus-simplify-subject-re
8809                             (mail-header-subject
8810                              (gnus-data-header (car data)))))))
8811         (push (gnus-data-number (car data)) articles))
8812       (unless (and (setq data (cdr data))
8813                    (> (gnus-data-level (car data)) top-level))
8814         (setq data nil)))
8815     ;; Return the list of articles.
8816     (nreverse articles)))
8817
8818 (defun gnus-summary-rethread-current ()
8819   "Rethread the thread the current article is part of."
8820   (interactive)
8821   (let* ((gnus-show-threads t)
8822          (article (gnus-summary-article-number))
8823          (id (mail-header-id (gnus-summary-article-header)))
8824          (gnus-newsgroup-threads (list (gnus-id-to-thread (gnus-root-id id)))))
8825     (unless id
8826       (error "No article on the current line"))
8827     (gnus-rebuild-thread id)
8828     (gnus-summary-goto-subject article)))
8829
8830 (defun gnus-summary-reparent-thread ()
8831   "Make the current article child of the marked (or previous) article.
8832
8833 Note that the re-threading will only work if `gnus-thread-ignore-subject'
8834 is non-nil or the Subject: of both articles are the same."
8835   (interactive)
8836   (unless (not (gnus-group-read-only-p))
8837     (error "The current newsgroup does not support article editing"))
8838   (unless (<= (length gnus-newsgroup-processable) 1)
8839     (error "No more than one article may be marked"))
8840   (save-window-excursion
8841     (let ((gnus-article-buffer " *reparent*")
8842           (current-article (gnus-summary-article-number))
8843           ;; First grab the marked article, otherwise one line up.
8844           (parent-article (if (not (null gnus-newsgroup-processable))
8845                               (car gnus-newsgroup-processable)
8846                             (save-excursion
8847                               (if (eq (forward-line -1) 0)
8848                                   (gnus-summary-article-number)
8849                                 (error "Beginning of summary buffer"))))))
8850       (unless (not (eq current-article parent-article))
8851         (error "An article may not be self-referential"))
8852       (let ((message-id (mail-header-id
8853                          (gnus-summary-article-header parent-article))))
8854         (unless (and message-id (not (equal message-id "")))
8855           (error "No message-id in desired parent"))
8856         (gnus-with-article current-article
8857           (save-restriction
8858             (goto-char (point-min))
8859             (message-narrow-to-head)
8860             (if (re-search-forward "^References: " nil t)
8861                 (progn
8862                   (re-search-forward "^[^ \t]" nil t)
8863                   (forward-line -1)
8864                   (end-of-line)
8865                   (insert " " message-id))
8866               (insert "References: " message-id "\n"))))
8867         (set-buffer gnus-summary-buffer)
8868         (gnus-summary-unmark-all-processable)
8869         (gnus-summary-update-article current-article)
8870         (gnus-summary-rethread-current)
8871         (gnus-message 3 "Article %d is now the child of article %d"
8872                       current-article parent-article)))))
8873
8874 (defun gnus-summary-toggle-threads (&optional arg)
8875   "Toggle showing conversation threads.
8876 If ARG is positive number, turn showing conversation threads on."
8877   (interactive "P")
8878   (let ((current (or (gnus-summary-article-number) gnus-newsgroup-end)))
8879     (setq gnus-show-threads
8880           (if (null arg) (not gnus-show-threads)
8881             (> (prefix-numeric-value arg) 0)))
8882     (gnus-summary-prepare)
8883     (gnus-summary-goto-subject current)
8884     (gnus-message 6 "Threading is now %s" (if gnus-show-threads "on" "off"))
8885     (gnus-summary-position-point)))
8886
8887 (defun gnus-summary-show-all-threads ()
8888   "Show all threads."
8889   (interactive)
8890   (save-excursion
8891     (let ((buffer-read-only nil))
8892       (subst-char-in-region (point-min) (point-max) ?\^M ?\n t)))
8893   (gnus-summary-position-point))
8894
8895 (defun gnus-summary-show-thread ()
8896   "Show thread subtrees.
8897 Returns nil if no thread was there to be shown."
8898   (interactive)
8899   (let ((buffer-read-only nil)
8900         (orig (point))
8901         ;; first goto end then to beg, to have point at beg after let
8902         (end (progn (end-of-line) (point)))
8903         (beg (progn (beginning-of-line) (point))))
8904     (prog1
8905         ;; Any hidden lines here?
8906         (search-forward "\r" end t)
8907       (subst-char-in-region beg end ?\^M ?\n t)
8908       (goto-char orig)
8909       (gnus-summary-position-point))))
8910
8911 (defun gnus-summary-hide-all-threads ()
8912   "Hide all thread subtrees."
8913   (interactive)
8914   (save-excursion
8915     (goto-char (point-min))
8916     (gnus-summary-hide-thread)
8917     (while (zerop (gnus-summary-next-thread 1 t))
8918       (gnus-summary-hide-thread)))
8919   (gnus-summary-position-point))
8920
8921 (defun gnus-summary-hide-thread ()
8922   "Hide thread subtrees.
8923 Returns nil if no threads were there to be hidden."
8924   (interactive)
8925   (let ((buffer-read-only nil)
8926         (start (point))
8927         (article (gnus-summary-article-number)))
8928     (goto-char start)
8929     ;; Go forward until either the buffer ends or the subthread
8930     ;; ends.
8931     (when (and (not (eobp))
8932                (or (zerop (gnus-summary-next-thread 1 t))
8933                    (goto-char (point-max))))
8934       (prog1
8935           (if (and (> (point) start)
8936                    (search-backward "\n" start t))
8937               (progn
8938                 (subst-char-in-region start (point) ?\n ?\^M)
8939                 (gnus-summary-goto-subject article))
8940             (goto-char start)
8941             nil)))))
8942
8943 (defun gnus-summary-go-to-next-thread (&optional previous)
8944   "Go to the same level (or less) next thread.
8945 If PREVIOUS is non-nil, go to previous thread instead.
8946 Return the article number moved to, or nil if moving was impossible."
8947   (let ((level (gnus-summary-thread-level))
8948         (way (if previous -1 1))
8949         (beg (point)))
8950     (forward-line way)
8951     (while (and (not (eobp))
8952                 (< level (gnus-summary-thread-level)))
8953       (forward-line way))
8954     (if (eobp)
8955         (progn
8956           (goto-char beg)
8957           nil)
8958       (setq beg (point))
8959       (prog1
8960           (gnus-summary-article-number)
8961         (goto-char beg)))))
8962
8963 (defun gnus-summary-next-thread (n &optional silent)
8964   "Go to the same level next N'th thread.
8965 If N is negative, search backward instead.
8966 Returns the difference between N and the number of skips actually
8967 done.
8968
8969 If SILENT, don't output messages."
8970   (interactive "p")
8971   (let ((backward (< n 0))
8972         (n (abs n)))
8973     (while (and (> n 0)
8974                 (gnus-summary-go-to-next-thread backward))
8975       (decf n))
8976     (unless silent
8977       (gnus-summary-position-point))
8978     (when (and (not silent) (/= 0 n))
8979       (gnus-message 7 "No more threads"))
8980     n))
8981
8982 (defun gnus-summary-prev-thread (n)
8983   "Go to the same level previous N'th thread.
8984 Returns the difference between N and the number of skips actually
8985 done."
8986   (interactive "p")
8987   (gnus-summary-next-thread (- n)))
8988
8989 (defun gnus-summary-go-down-thread ()
8990   "Go down one level in the current thread."
8991   (let ((children (gnus-summary-article-children)))
8992     (when children
8993       (gnus-summary-goto-subject (car children)))))
8994
8995 (defun gnus-summary-go-up-thread ()
8996   "Go up one level in the current thread."
8997   (let ((parent (gnus-summary-article-parent)))
8998     (when parent
8999       (gnus-summary-goto-subject parent))))
9000
9001 (defun gnus-summary-down-thread (n)
9002   "Go down thread N steps.
9003 If N is negative, go up instead.
9004 Returns the difference between N and how many steps down that were
9005 taken."
9006   (interactive "p")
9007   (let ((up (< n 0))
9008         (n (abs n)))
9009     (while (and (> n 0)
9010                 (if up (gnus-summary-go-up-thread)
9011                   (gnus-summary-go-down-thread)))
9012       (setq n (1- n)))
9013     (gnus-summary-position-point)
9014     (when (/= 0 n)
9015       (gnus-message 7 "Can't go further"))
9016     n))
9017
9018 (defun gnus-summary-up-thread (n)
9019   "Go up thread N steps.
9020 If N is negative, go up instead.
9021 Returns the difference between N and how many steps down that were
9022 taken."
9023   (interactive "p")
9024   (gnus-summary-down-thread (- n)))
9025
9026 (defun gnus-summary-top-thread ()
9027   "Go to the top of the thread."
9028   (interactive)
9029   (while (gnus-summary-go-up-thread))
9030   (gnus-summary-article-number))
9031
9032 (defun gnus-summary-kill-thread (&optional unmark)
9033   "Mark articles under current thread as read.
9034 If the prefix argument is positive, remove any kinds of marks.
9035 If the prefix argument is negative, tick articles instead."
9036   (interactive "P")
9037   (when unmark
9038     (setq unmark (prefix-numeric-value unmark)))
9039   (let ((articles (gnus-summary-articles-in-thread)))
9040     (save-excursion
9041       ;; Expand the thread.
9042       (gnus-summary-show-thread)
9043       ;; Mark all the articles.
9044       (while articles
9045         (gnus-summary-goto-subject (car articles))
9046         (cond ((null unmark)
9047                (gnus-summary-mark-article-as-read gnus-killed-mark))
9048               ((> unmark 0)
9049                (gnus-summary-mark-article-as-unread gnus-unread-mark))
9050               (t
9051                (gnus-summary-mark-article-as-unread gnus-ticked-mark)))
9052         (setq articles (cdr articles))))
9053     ;; Hide killed subtrees.
9054     (and (null unmark)
9055          gnus-thread-hide-killed
9056          (gnus-summary-hide-thread))
9057     ;; If marked as read, go to next unread subject.
9058     (when (null unmark)
9059       ;; Go to next unread subject.
9060       (gnus-summary-next-subject 1 t)))
9061   (gnus-set-mode-line 'summary))
9062
9063 ;; Summary sorting commands
9064
9065 (defun gnus-summary-sort-by-number (&optional reverse)
9066   "Sort the summary buffer by article number.
9067 Argument REVERSE means reverse order."
9068   (interactive "P")
9069   (gnus-summary-sort 'number reverse))
9070
9071 (defun gnus-summary-sort-by-author (&optional reverse)
9072   "Sort the summary buffer by author name alphabetically.
9073 If `case-fold-search' is non-nil, case of letters is ignored.
9074 Argument REVERSE means reverse order."
9075   (interactive "P")
9076   (gnus-summary-sort 'author reverse))
9077
9078 (defun gnus-summary-sort-by-subject (&optional reverse)
9079   "Sort the summary buffer by subject alphabetically.  `Re:'s are ignored.
9080 If `case-fold-search' is non-nil, case of letters is ignored.
9081 Argument REVERSE means reverse order."
9082   (interactive "P")
9083   (gnus-summary-sort 'subject reverse))
9084
9085 (defun gnus-summary-sort-by-date (&optional reverse)
9086   "Sort the summary buffer by date.
9087 Argument REVERSE means reverse order."
9088   (interactive "P")
9089   (gnus-summary-sort 'date reverse))
9090
9091 (defun gnus-summary-sort-by-score (&optional reverse)
9092   "Sort the summary buffer by score.
9093 Argument REVERSE means reverse order."
9094   (interactive "P")
9095   (gnus-summary-sort 'score reverse))
9096
9097 (defun gnus-summary-sort-by-lines (&optional reverse)
9098   "Sort the summary buffer by the number of lines.
9099 Argument REVERSE means reverse order."
9100   (interactive "P")
9101   (gnus-summary-sort 'lines reverse))
9102
9103 (defun gnus-summary-sort-by-chars (&optional reverse)
9104   "Sort the summary buffer by article length.
9105 Argument REVERSE means reverse order."
9106   (interactive "P")
9107   (gnus-summary-sort 'chars reverse))
9108
9109 (defun gnus-summary-sort (predicate reverse)
9110   "Sort summary buffer by PREDICATE.  REVERSE means reverse order."
9111   (let* ((thread (intern (format "gnus-thread-sort-by-%s" predicate)))
9112          (article (intern (format "gnus-article-sort-by-%s" predicate)))
9113          (gnus-thread-sort-functions
9114           (if (not reverse)
9115               thread
9116             `(lambda (t1 t2)
9117                (,thread t2 t1))))
9118          (gnus-sort-gathered-threads-function
9119           gnus-thread-sort-functions)
9120          (gnus-article-sort-functions
9121           (if (not reverse)
9122               article
9123             `(lambda (t1 t2)
9124                (,article t2 t1))))
9125          (buffer-read-only)
9126          (gnus-summary-prepare-hook nil))
9127     ;; We do the sorting by regenerating the threads.
9128     (gnus-summary-prepare)
9129     ;; Hide subthreads if needed.
9130     (when (and gnus-show-threads gnus-thread-hide-subtree)
9131       (gnus-summary-hide-all-threads))))
9132
9133 ;; Summary saving commands.
9134
9135 (defun gnus-summary-save-article (&optional n not-saved)
9136   "Save the current article using the default saver function.
9137 If N is a positive number, save the N next articles.
9138 If N is a negative number, save the N previous articles.
9139 If N is nil and any articles have been marked with the process mark,
9140 save those articles instead.
9141 The variable `gnus-default-article-saver' specifies the saver function."
9142   (interactive "P")
9143   (let* ((articles (gnus-summary-work-articles n))
9144          (save-buffer (save-excursion
9145                         (nnheader-set-temp-buffer " *Gnus Save*")))
9146          (num (length articles))
9147          header file)
9148     (dolist (article articles)
9149       (setq header (gnus-summary-article-header article))
9150       (if (not (vectorp header))
9151           ;; This is a pseudo-article.
9152           (if (assq 'name header)
9153               (gnus-copy-file (cdr (assq 'name header)))
9154             (gnus-message 1 "Article %d is unsaveable" article))
9155         ;; This is a real article.
9156         (save-window-excursion
9157           (let ((gnus-display-mime-function nil)
9158                 (gnus-article-prepare-hook nil))
9159             (gnus-summary-select-article t nil nil article)))
9160         (save-excursion
9161           (set-buffer save-buffer)
9162           (erase-buffer)
9163           (insert-buffer-substring gnus-original-article-buffer))
9164         (setq file (gnus-article-save save-buffer file num))
9165         (gnus-summary-remove-process-mark article)
9166         (unless not-saved
9167           (gnus-summary-set-saved-mark article))))
9168     (gnus-kill-buffer save-buffer)
9169     (gnus-summary-position-point)
9170     (gnus-set-mode-line 'summary)
9171     n))
9172
9173 (defun gnus-summary-pipe-output (&optional arg)
9174   "Pipe the current article to a subprocess.
9175 If N is a positive number, pipe the N next articles.
9176 If N is a negative number, pipe the N previous articles.
9177 If N is nil and any articles have been marked with the process mark,
9178 pipe those articles instead."
9179   (interactive "P")
9180   (require 'gnus-art)
9181   (let ((gnus-default-article-saver 'gnus-summary-save-in-pipe))
9182     (gnus-summary-save-article arg t))
9183   (gnus-configure-windows 'pipe))
9184
9185 (defun gnus-summary-save-article-mail (&optional arg)
9186   "Append the current article to an mail file.
9187 If N is a positive number, save the N next articles.
9188 If N is a negative number, save the N previous articles.
9189 If N is nil and any articles have been marked with the process mark,
9190 save those articles instead."
9191   (interactive "P")
9192   (require 'gnus-art)
9193   (let ((gnus-default-article-saver 'gnus-summary-save-in-mail))
9194     (gnus-summary-save-article arg)))
9195
9196 (defun gnus-summary-save-article-rmail (&optional arg)
9197   "Append the current article to an rmail file.
9198 If N is a positive number, save the N next articles.
9199 If N is a negative number, save the N previous articles.
9200 If N is nil and any articles have been marked with the process mark,
9201 save those articles instead."
9202   (interactive "P")
9203   (require 'gnus-art)
9204   (let ((gnus-default-article-saver 'gnus-summary-save-in-rmail))
9205     (gnus-summary-save-article arg)))
9206
9207 (defun gnus-summary-save-article-file (&optional arg)
9208   "Append the current article to a file.
9209 If N is a positive number, save the N next articles.
9210 If N is a negative number, save the N previous articles.
9211 If N is nil and any articles have been marked with the process mark,
9212 save those articles instead."
9213   (interactive "P")
9214   (require 'gnus-art)
9215   (let ((gnus-default-article-saver 'gnus-summary-save-in-file))
9216     (gnus-summary-save-article arg)))
9217
9218 (defun gnus-summary-write-article-file (&optional arg)
9219   "Write the current article to a file, deleting the previous file.
9220 If N is a positive number, save the N next articles.
9221 If N is a negative number, save the N previous articles.
9222 If N is nil and any articles have been marked with the process mark,
9223 save those articles instead."
9224   (interactive "P")
9225   (require 'gnus-art)
9226   (let ((gnus-default-article-saver 'gnus-summary-write-to-file))
9227     (gnus-summary-save-article arg)))
9228
9229 (defun gnus-summary-save-article-body-file (&optional arg)
9230   "Append the current article body to a file.
9231 If N is a positive number, save the N next articles.
9232 If N is a negative number, save the N previous articles.
9233 If N is nil and any articles have been marked with the process mark,
9234 save those articles instead."
9235   (interactive "P")
9236   (require 'gnus-art)
9237   (let ((gnus-default-article-saver 'gnus-summary-save-body-in-file))
9238     (gnus-summary-save-article arg)))
9239
9240 (defun gnus-summary-pipe-message (program)
9241   "Pipe the current article through PROGRAM."
9242   (interactive "sProgram: ")
9243   (gnus-summary-select-article)
9244   (let ((mail-header-separator ""))
9245     (gnus-eval-in-buffer-window gnus-article-buffer
9246       (save-restriction
9247         (widen)
9248         (let ((start (window-start))
9249               buffer-read-only)
9250           (message-pipe-buffer-body program)
9251           (set-window-start (get-buffer-window (current-buffer)) start))))))
9252
9253 (defun gnus-get-split-value (methods)
9254   "Return a value based on the split METHODS."
9255   (let (split-name method result match)
9256     (when methods
9257       (save-excursion
9258         (set-buffer gnus-original-article-buffer)
9259         (save-restriction
9260           (nnheader-narrow-to-headers)
9261           (while (and methods (not split-name))
9262             (goto-char (point-min))
9263             (setq method (pop methods))
9264             (setq match (car method))
9265             (when (cond
9266                    ((stringp match)
9267                     ;; Regular expression.
9268                     (ignore-errors
9269                       (re-search-forward match nil t)))
9270                    ((gnus-functionp match)
9271                     ;; Function.
9272                     (save-restriction
9273                       (widen)
9274                       (setq result (funcall match gnus-newsgroup-name))))
9275                    ((consp match)
9276                     ;; Form.
9277                     (save-restriction
9278                       (widen)
9279                       (setq result (eval match)))))
9280               (setq split-name (cdr method))
9281               (cond ((stringp result)
9282                      (push (expand-file-name
9283                             result gnus-article-save-directory)
9284                            split-name))
9285                     ((consp result)
9286                      (setq split-name (append result split-name)))))))))
9287     (nreverse split-name)))
9288
9289 (defun gnus-valid-move-group-p (group)
9290   (and (boundp group)
9291        (symbol-name group)
9292        (symbol-value group)
9293        (gnus-get-function (gnus-find-method-for-group
9294                            (symbol-name group)) 'request-accept-article t)))
9295
9296 (defun gnus-read-move-group-name (prompt default articles prefix)
9297   "Read a group name."
9298   (let* ((split-name (gnus-get-split-value gnus-move-split-methods))
9299          (minibuffer-confirm-incomplete nil) ; XEmacs
9300          (prom
9301           (format "%s %s to:"
9302                   prompt
9303                   (if (> (length articles) 1)
9304                       (format "these %d articles" (length articles))
9305                     "this article")))
9306          (to-newsgroup
9307           (cond
9308            ((null split-name)
9309             (gnus-completing-read default prom
9310                                   gnus-active-hashtb
9311                                   'gnus-valid-move-group-p
9312                                   nil prefix
9313                                   'gnus-group-history))
9314            ((= 1 (length split-name))
9315             (gnus-completing-read (car split-name) prom
9316                                   gnus-active-hashtb
9317                                   'gnus-valid-move-group-p
9318                                   nil nil
9319                                   'gnus-group-history))
9320            (t
9321             (gnus-completing-read nil prom
9322                                   (mapcar (lambda (el) (list el))
9323                                           (nreverse split-name))
9324                                   nil nil nil
9325                                   'gnus-group-history))))
9326          (to-method (gnus-server-to-method (gnus-group-method to-newsgroup))))
9327     (when to-newsgroup
9328       (if (or (string= to-newsgroup "")
9329               (string= to-newsgroup prefix))
9330           (setq to-newsgroup default))
9331       (unless to-newsgroup
9332         (error "No group name entered"))
9333       (or (gnus-active to-newsgroup)
9334           (gnus-activate-group to-newsgroup nil nil to-method)
9335           (if (gnus-y-or-n-p (format "No such group: %s.  Create it? "
9336                                      to-newsgroup))
9337               (or (and (gnus-request-create-group to-newsgroup to-method)
9338                        (gnus-activate-group
9339                         to-newsgroup nil nil to-method)
9340                        (gnus-subscribe-group to-newsgroup))
9341                   (error "Couldn't create group %s" to-newsgroup)))
9342           (error "No such group: %s" to-newsgroup)))
9343     to-newsgroup))
9344
9345 (defun gnus-summary-save-parts (type dir n &optional reverse)
9346   "Save parts matching TYPE to DIR.
9347 If REVERSE, save parts that do not match TYPE."
9348   (interactive
9349    (list (read-string "Save parts of type: "
9350                       (or (car gnus-summary-save-parts-type-history)
9351                           gnus-summary-save-parts-default-mime)
9352                       'gnus-summary-save-parts-type-history)
9353          (setq gnus-summary-save-parts-last-directory
9354                (read-file-name "Save to directory: "
9355                                gnus-summary-save-parts-last-directory
9356                                nil t))
9357          current-prefix-arg))
9358   (gnus-summary-iterate n
9359     (let ((gnus-display-mime-function nil)
9360           (gnus-inhibit-treatment t))
9361       (gnus-summary-select-article))
9362     (save-excursion
9363       (set-buffer gnus-article-buffer)
9364       (let ((handles (or gnus-article-mime-handles
9365                          (mm-dissect-buffer) (mm-uu-dissect))))
9366         (when handles
9367           (gnus-summary-save-parts-1 type dir handles reverse)
9368           (unless gnus-article-mime-handles ;; Don't destroy this case.
9369             (mm-destroy-parts handles)))))))
9370
9371 (defun gnus-summary-save-parts-1 (type dir handle reverse)
9372   (if (stringp (car handle))
9373       (mapcar (lambda (h) (gnus-summary-save-parts-1 type dir h reverse))
9374               (cdr handle))
9375     (when (if reverse
9376               (not (string-match type (mm-handle-media-type handle)))
9377             (string-match type (mm-handle-media-type handle)))
9378       (let ((file (expand-file-name
9379                    (file-name-nondirectory
9380                     (or
9381                      (mail-content-type-get
9382                       (mm-handle-disposition handle) 'filename)
9383                      (concat gnus-newsgroup-name
9384                              "." (number-to-string
9385                                   (cdr gnus-article-current)))))
9386                    dir)))
9387         (unless (file-exists-p file)
9388           (mm-save-part-to-file handle file))))))
9389
9390 ;; Summary extract commands
9391
9392 (defun gnus-summary-insert-pseudos (pslist &optional not-view)
9393   (let ((buffer-read-only nil)
9394         (article (gnus-summary-article-number))
9395         after-article b e)
9396     (unless (gnus-summary-goto-subject article)
9397       (error "No such article: %d" article))
9398     (gnus-summary-position-point)
9399     ;; If all commands are to be bunched up on one line, we collect
9400     ;; them here.
9401     (unless gnus-view-pseudos-separately
9402       (let ((ps (setq pslist (sort pslist 'gnus-pseudos<)))
9403             files action)
9404         (while ps
9405           (setq action (cdr (assq 'action (car ps))))
9406           (setq files (list (cdr (assq 'name (car ps)))))
9407           (while (and ps (cdr ps)
9408                       (string= (or action "1")
9409                                (or (cdr (assq 'action (cadr ps))) "2")))
9410             (push (cdr (assq 'name (cadr ps))) files)
9411             (setcdr ps (cddr ps)))
9412           (when files
9413             (when (not (string-match "%s" action))
9414               (push " " files))
9415             (push " " files)
9416             (when (assq 'execute (car ps))
9417               (setcdr (assq 'execute (car ps))
9418                       (funcall (if (string-match "%s" action)
9419                                    'format 'concat)
9420                                action
9421                                (mapconcat
9422                                 (lambda (f)
9423                                   (if (equal f " ")
9424                                       f
9425                                     (mm-quote-arg f)))
9426                                 files " ")))))
9427           (setq ps (cdr ps)))))
9428     (if (and gnus-view-pseudos (not not-view))
9429         (while pslist
9430           (when (assq 'execute (car pslist))
9431             (gnus-execute-command (cdr (assq 'execute (car pslist)))
9432                                   (eq gnus-view-pseudos 'not-confirm)))
9433           (setq pslist (cdr pslist)))
9434       (save-excursion
9435         (while pslist
9436           (setq after-article (or (cdr (assq 'article (car pslist)))
9437                                   (gnus-summary-article-number)))
9438           (gnus-summary-goto-subject after-article)
9439           (forward-line 1)
9440           (setq b (point))
9441           (insert "    " (file-name-nondirectory
9442                           (cdr (assq 'name (car pslist))))
9443                   ": " (or (cdr (assq 'execute (car pslist))) "") "\n")
9444           (setq e (point))
9445           (forward-line -1)             ; back to `b'
9446           (gnus-add-text-properties
9447            b (1- e) (list 'gnus-number gnus-reffed-article-number
9448                           gnus-mouse-face-prop gnus-mouse-face))
9449           (gnus-data-enter
9450            after-article gnus-reffed-article-number
9451            gnus-unread-mark b (car pslist) 0 (- e b))
9452           (push gnus-reffed-article-number gnus-newsgroup-unreads)
9453           (setq gnus-reffed-article-number (1- gnus-reffed-article-number))
9454           (setq pslist (cdr pslist)))))))
9455
9456 (defun gnus-pseudos< (p1 p2)
9457   (let ((c1 (cdr (assq 'action p1)))
9458         (c2 (cdr (assq 'action p2))))
9459     (and c1 c2 (string< c1 c2))))
9460
9461 (defun gnus-request-pseudo-article (props)
9462   (cond ((assq 'execute props)
9463          (gnus-execute-command (cdr (assq 'execute props)))))
9464   (let ((gnus-current-article (gnus-summary-article-number)))
9465     (gnus-run-hooks 'gnus-mark-article-hook)))
9466
9467 (defun gnus-execute-command (command &optional automatic)
9468   (save-excursion
9469     (gnus-article-setup-buffer)
9470     (set-buffer gnus-article-buffer)
9471     (setq buffer-read-only nil)
9472     (let ((command (if automatic command
9473                      (read-string "Command: " (cons command 0)))))
9474       (erase-buffer)
9475       (insert "$ " command "\n\n")
9476       (if gnus-view-pseudo-asynchronously
9477           (start-process "gnus-execute" (current-buffer) shell-file-name
9478                          shell-command-switch command)
9479         (call-process shell-file-name nil t nil
9480                       shell-command-switch command)))))
9481
9482 ;; Summary kill commands.
9483
9484 (defun gnus-summary-edit-global-kill (article)
9485   "Edit the \"global\" kill file."
9486   (interactive (list (gnus-summary-article-number)))
9487   (gnus-group-edit-global-kill article))
9488
9489 (defun gnus-summary-edit-local-kill ()
9490   "Edit a local kill file applied to the current newsgroup."
9491   (interactive)
9492   (setq gnus-current-headers (gnus-summary-article-header))
9493   (gnus-group-edit-local-kill
9494    (gnus-summary-article-number) gnus-newsgroup-name))
9495
9496 ;;; Header reading.
9497
9498 (defun gnus-read-header (id &optional header)
9499   "Read the headers of article ID and enter them into the Gnus system."
9500   (let ((group gnus-newsgroup-name)
9501         (gnus-override-method
9502          (or
9503           gnus-override-method
9504           (and (gnus-news-group-p gnus-newsgroup-name)
9505                (car (gnus-refer-article-methods)))))
9506         where)
9507     ;; First we check to see whether the header in question is already
9508     ;; fetched.
9509     (if (stringp id)
9510         ;; This is a Message-ID.
9511         (setq header (or header (gnus-id-to-header id)))
9512       ;; This is an article number.
9513       (setq header (or header (gnus-summary-article-header id))))
9514     (if (and header
9515              (not (gnus-summary-article-sparse-p (mail-header-number header))))
9516         ;; We have found the header.
9517         header
9518       ;; If this is a sparse article, we have to nix out its
9519       ;; previous entry in the thread hashtb.
9520       (when (and header
9521                  (gnus-summary-article-sparse-p (mail-header-number header)))
9522         (let* ((parent (gnus-parent-id (mail-header-references header)))
9523                (thread (and parent (gnus-id-to-thread parent))))
9524           (when thread
9525             (delq (assq header thread) thread))))
9526       ;; We have to really fetch the header to this article.
9527       (save-excursion
9528         (set-buffer nntp-server-buffer)
9529         (when (setq where (gnus-request-head id group))
9530           (nnheader-fold-continuation-lines)
9531           (goto-char (point-max))
9532           (insert ".\n")
9533           (goto-char (point-min))
9534           (insert "211 ")
9535           (princ (cond
9536                   ((numberp id) id)
9537                   ((cdr where) (cdr where))
9538                   (header (mail-header-number header))
9539                   (t gnus-reffed-article-number))
9540                  (current-buffer))
9541           (insert " Article retrieved.\n"))
9542         (if (or (not where)
9543                 (not (setq header (car (gnus-get-newsgroup-headers nil t)))))
9544             ()                          ; Malformed head.
9545           (unless (gnus-summary-article-sparse-p (mail-header-number header))
9546             (when (and (stringp id)
9547                        (not (string= (gnus-group-real-name group)
9548                                      (car where))))
9549               ;; If we fetched by Message-ID and the article came
9550               ;; from a different group, we fudge some bogus article
9551               ;; numbers for this article.
9552               (mail-header-set-number header gnus-reffed-article-number))
9553             (save-excursion
9554               (set-buffer gnus-summary-buffer)
9555               (decf gnus-reffed-article-number)
9556               (gnus-remove-header (mail-header-number header))
9557               (push header gnus-newsgroup-headers)
9558               (setq gnus-current-headers header)
9559               (push (mail-header-number header) gnus-newsgroup-limit)))
9560           header)))))
9561
9562 (defun gnus-remove-header (number)
9563   "Remove header NUMBER from `gnus-newsgroup-headers'."
9564   (if (and gnus-newsgroup-headers
9565            (= number (mail-header-number (car gnus-newsgroup-headers))))
9566       (pop gnus-newsgroup-headers)
9567     (let ((headers gnus-newsgroup-headers))
9568       (while (and (cdr headers)
9569                   (not (= number (mail-header-number (cadr headers)))))
9570         (pop headers))
9571       (when (cdr headers)
9572         (setcdr headers (cddr headers))))))
9573
9574 ;;;
9575 ;;; summary highlights
9576 ;;;
9577
9578 (defun gnus-highlight-selected-summary ()
9579   "Highlight selected article in summary buffer."
9580   ;; Added by Per Abrahamsen <amanda@iesd.auc.dk>.
9581   (when gnus-summary-selected-face
9582     (save-excursion
9583       (let* ((beg (progn (beginning-of-line) (point)))
9584              (end (progn (end-of-line) (point)))
9585              ;; Fix by Mike Dugan <dugan@bucrf16.bu.edu>.
9586              (from (if (get-text-property beg gnus-mouse-face-prop)
9587                        beg
9588                      (or (next-single-property-change
9589                           beg gnus-mouse-face-prop nil end)
9590                          beg)))
9591              (to
9592               (if (= from end)
9593                   (- from 2)
9594                 (or (next-single-property-change
9595                      from gnus-mouse-face-prop nil end)
9596                     end))))
9597         ;; If no mouse-face prop on line we will have to = from = end,
9598         ;; so we highlight the entire line instead.
9599         (when (= (+ to 2) from)
9600           (setq from beg)
9601           (setq to end))
9602         (if gnus-newsgroup-selected-overlay
9603             ;; Move old overlay.
9604             (gnus-move-overlay
9605              gnus-newsgroup-selected-overlay from to (current-buffer))
9606           ;; Create new overlay.
9607           (gnus-overlay-put
9608            (setq gnus-newsgroup-selected-overlay (gnus-make-overlay from to))
9609            'face gnus-summary-selected-face))))))
9610
9611 ;; New implementation by Christian Limpach <Christian.Limpach@nice.ch>.
9612 (defun gnus-summary-highlight-line ()
9613   "Highlight current line according to `gnus-summary-highlight'."
9614   (let* ((list gnus-summary-highlight)
9615          (p (point))
9616          (end (progn (end-of-line) (point)))
9617          ;; now find out where the line starts and leave point there.
9618          (beg (progn (beginning-of-line) (point)))
9619          (article (gnus-summary-article-number))
9620          (score (or (cdr (assq (or article gnus-current-article)
9621                                gnus-newsgroup-scored))
9622                     gnus-summary-default-score 0))
9623          (mark (or (gnus-summary-article-mark) gnus-unread-mark))
9624          (inhibit-read-only t))
9625     ;; Eval the cars of the lists until we find a match.
9626     (let ((default gnus-summary-default-score))
9627       (while (and list
9628                   (not (eval (caar list))))
9629         (setq list (cdr list))))
9630     (let ((face (cdar list)))
9631       (unless (eq face (get-text-property beg 'face))
9632         (gnus-put-text-property-excluding-characters-with-faces
9633          beg end 'face
9634          (setq face (if (boundp face) (symbol-value face) face)))
9635         (when gnus-summary-highlight-line-function
9636           (funcall gnus-summary-highlight-line-function article face))))
9637     (goto-char p)))
9638
9639 (defun gnus-update-read-articles (group unread &optional compute)
9640   "Update the list of read articles in GROUP."
9641   (let* ((active (or gnus-newsgroup-active (gnus-active group)))
9642          (entry (gnus-gethash group gnus-newsrc-hashtb))
9643          (info (nth 2 entry))
9644          (prev 1)
9645          (unread (sort (copy-sequence unread) '<))
9646          read)
9647     (if (or (not info) (not active))
9648         ;; There is no info on this group if it was, in fact,
9649         ;; killed.  Gnus stores no information on killed groups, so
9650         ;; there's nothing to be done.
9651         ;; One could store the information somewhere temporarily,
9652         ;; perhaps...  Hmmm...
9653         ()
9654       ;; Remove any negative articles numbers.
9655       (while (and unread (< (car unread) 0))
9656         (setq unread (cdr unread)))
9657       ;; Remove any expired article numbers
9658       (while (and unread (< (car unread) (car active)))
9659         (setq unread (cdr unread)))
9660       ;; Compute the ranges of read articles by looking at the list of
9661       ;; unread articles.
9662       (while unread
9663         (when (/= (car unread) prev)
9664           (push (if (= prev (1- (car unread))) prev
9665                   (cons prev (1- (car unread))))
9666                 read))
9667         (setq prev (1+ (car unread)))
9668         (setq unread (cdr unread)))
9669       (when (<= prev (cdr active))
9670         (push (cons prev (cdr active)) read))
9671       (setq read (if (> (length read) 1) (nreverse read) read))
9672       (if compute
9673           read
9674         (save-excursion
9675           (let (setmarkundo)
9676             ;; Propagate the read marks to the backend.
9677             (when (gnus-check-backend-function 'request-set-mark group)
9678               (let ((del (gnus-remove-from-range (gnus-info-read info) read))
9679                     (add (gnus-remove-from-range read (gnus-info-read info))))
9680                 (when (or add del)
9681                   (unless (gnus-check-group group)
9682                     (error "Can't open server for %s" group))
9683                   (gnus-request-set-mark
9684                    group (delq nil (list (if add (list add 'add '(read)))
9685                                          (if del (list del 'del '(read))))))
9686                   (setq setmarkundo
9687                         `(gnus-request-set-mark
9688                           ,group
9689                           ',(delq nil (list
9690                                        (if del (list del 'add '(read)))
9691                                        (if add (list add 'del '(read))))))))))
9692             (set-buffer gnus-group-buffer)
9693             (gnus-undo-register
9694               `(progn
9695                  (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
9696                  (gnus-info-set-read ',info ',(gnus-info-read info))
9697                  (gnus-get-unread-articles-in-group ',info
9698                                                     (gnus-active ,group))
9699                  (gnus-group-update-group ,group t)
9700                  ,setmarkundo))))
9701         ;; Enter this list into the group info.
9702         (gnus-info-set-read info read)
9703         ;; Set the number of unread articles in gnus-newsrc-hashtb.
9704         (gnus-get-unread-articles-in-group info (gnus-active group))
9705         t))))
9706
9707 (defun gnus-offer-save-summaries ()
9708   "Offer to save all active summary buffers."
9709   (save-excursion
9710     (let ((buflist (buffer-list))
9711           buffers bufname)
9712       ;; Go through all buffers and find all summaries.
9713       (while buflist
9714         (and (setq bufname (buffer-name (car buflist)))
9715              (string-match "Summary" bufname)
9716              (save-excursion
9717                (set-buffer bufname)
9718                ;; We check that this is, indeed, a summary buffer.
9719                (and (eq major-mode 'gnus-summary-mode)
9720                     ;; Also make sure this isn't bogus.
9721                     gnus-newsgroup-prepared
9722                     ;; Also make sure that this isn't a dead summary buffer.
9723                     (not gnus-dead-summary-mode)))
9724              (push bufname buffers))
9725         (setq buflist (cdr buflist)))
9726       ;; Go through all these summary buffers and offer to save them.
9727       (when buffers
9728         (map-y-or-n-p
9729          "Update summary buffer %s? "
9730          (lambda (buf)
9731            (switch-to-buffer buf)
9732            (gnus-summary-exit))
9733          buffers)))))
9734
9735 (defun gnus-summary-setup-default-charset ()
9736   "Setup newsgroup default charset."
9737   (if (equal gnus-newsgroup-name "nndraft:drafts")
9738       (setq gnus-newsgroup-charset nil)
9739     (let* ((name (and gnus-newsgroup-name
9740                       (gnus-group-real-name gnus-newsgroup-name)))
9741            (ignored-charsets
9742             (or gnus-newsgroup-ephemeral-ignored-charsets
9743                 (append
9744                  (and gnus-newsgroup-name
9745                       (or (gnus-group-find-parameter gnus-newsgroup-name
9746                                                      'ignored-charsets t)
9747                           (let ((alist gnus-group-ignored-charsets-alist)
9748                                 elem (charsets nil))
9749                             (while (setq elem (pop alist))
9750                               (when (and name
9751                                          (string-match (car elem) name))
9752                                 (setq alist nil
9753                                       charsets (cdr elem))))
9754                             charsets)))
9755                  gnus-newsgroup-ignored-charsets))))
9756       (setq gnus-newsgroup-charset
9757             (or gnus-newsgroup-ephemeral-charset
9758                 (and gnus-newsgroup-name
9759                      (or (gnus-group-find-parameter gnus-newsgroup-name 'charset)
9760                          (let ((alist gnus-group-charset-alist)
9761                                elem charset)
9762                            (while (setq elem (pop alist))
9763                              (when (and name
9764                                         (string-match (car elem) name))
9765                                (setq alist nil
9766                                      charset (cadr elem))))
9767                            charset)))
9768                 gnus-default-charset))
9769       (set (make-local-variable 'gnus-newsgroup-ignored-charsets)
9770            ignored-charsets))))
9771
9772 ;;;
9773 ;;; Mime Commands
9774 ;;;
9775
9776 (defun gnus-summary-display-buttonized (&optional show-all-parts)
9777   "Display the current article buffer fully MIME-buttonized.
9778 If SHOW-ALL-PARTS (the prefix) is non-nil, all multipart/* parts are
9779 treated as multipart/mixed."
9780   (interactive "P")
9781   (require 'gnus-art)
9782   (let ((gnus-unbuttonized-mime-types nil)
9783         (gnus-mime-display-multipart-as-mixed show-all-parts))
9784     (gnus-summary-show-article)))
9785
9786 (defun gnus-summary-repair-multipart (article)
9787   "Add a Content-Type header to a multipart article without one."
9788   (interactive (list (gnus-summary-article-number)))
9789   (gnus-with-article article
9790     (message-narrow-to-head)
9791     (goto-char (point-max))
9792     (widen)
9793     (when (search-forward "\n--" nil t)
9794       (let ((separator (buffer-substring (point) (gnus-point-at-eol))))
9795         (message-narrow-to-head)
9796         (message-remove-header "Mime-Version")
9797         (message-remove-header "Content-Type")
9798         (goto-char (point-max))
9799         (insert (format "Content-Type: multipart/mixed; boundary=\"%s\"\n"
9800                         separator))
9801         (insert "Mime-Version: 1.0\n")
9802         (widen))))
9803   (let (gnus-mark-article-hook)
9804     (gnus-summary-select-article t t nil article)))
9805
9806 (defun gnus-summary-toggle-display-buttonized ()
9807   "Toggle the buttonizing of the article buffer."
9808   (interactive)
9809   (require 'gnus-art)
9810   (if (setq gnus-inhibit-mime-unbuttonizing
9811             (not gnus-inhibit-mime-unbuttonizing))
9812       (let ((gnus-unbuttonized-mime-types nil))
9813         (gnus-summary-show-article))
9814     (gnus-summary-show-article)))
9815
9816 ;;;
9817 ;;; Generic summary marking commands
9818 ;;;
9819
9820 (defvar gnus-summary-marking-alist
9821   '((read gnus-del-mark "d")
9822     (unread gnus-unread-mark "u")
9823     (ticked gnus-ticked-mark "!")
9824     (dormant gnus-dormant-mark "?")
9825     (expirable gnus-expirable-mark "e"))
9826   "An alist of names/marks/keystrokes.")
9827
9828 (defvar gnus-summary-generic-mark-map (make-sparse-keymap))
9829 (defvar gnus-summary-mark-map)
9830
9831 (defun gnus-summary-make-all-marking-commands ()
9832   (define-key gnus-summary-mark-map "M" gnus-summary-generic-mark-map)
9833   (dolist (elem gnus-summary-marking-alist)
9834     (apply 'gnus-summary-make-marking-command elem)))
9835
9836 (defun gnus-summary-make-marking-command (name mark keystroke)
9837   (let ((map (make-sparse-keymap)))
9838     (define-key gnus-summary-generic-mark-map keystroke map)
9839     (dolist (lway `((next "next" next nil "n")
9840                     (next-unread "next unread" next t "N")
9841                     (prev "previous" prev nil "p")
9842                     (prev-unread "previous unread" prev t "P")
9843                     (nomove "" nil nil ,keystroke)))
9844       (let ((func (gnus-summary-make-marking-command-1
9845                    mark (car lway) lway name)))
9846         (setq func (eval func))
9847         (define-key map (nth 4 lway) func)))))
9848
9849 (defun gnus-summary-make-marking-command-1 (mark way lway name)
9850   `(defun ,(intern
9851             (format "gnus-summary-put-mark-as-%s%s"
9852                     name (if (eq way 'nomove)
9853                              ""
9854                            (concat "-" (symbol-name way)))))
9855      (n)
9856      ,(format
9857        "Mark the current article as %s%s.
9858 If N, the prefix, then repeat N times.
9859 If N is negative, move in reverse order.
9860 The difference between N and the actual number of articles marked is
9861 returned."
9862        name (cadr lway))
9863      (interactive "p")
9864      (gnus-summary-generic-mark n ,mark ',(nth 2 lway) ,(nth 3 lway))))
9865
9866 (defun gnus-summary-generic-mark (n mark move unread)
9867   "Mark N articles with MARK."
9868   (unless (eq major-mode 'gnus-summary-mode)
9869     (error "This command can only be used in the summary buffer"))
9870   (gnus-summary-show-thread)
9871   (let ((nummove
9872          (cond
9873           ((eq move 'next) 1)
9874           ((eq move 'prev) -1)
9875           (t 0))))
9876     (if (zerop nummove)
9877         (setq n 1)
9878       (when (< n 0)
9879         (setq n (abs n)
9880               nummove (* -1 nummove))))
9881     (while (and (> n 0)
9882                 (gnus-summary-mark-article nil mark)
9883                 (zerop (gnus-summary-next-subject nummove unread t)))
9884       (setq n (1- n)))
9885     (when (/= 0 n)
9886       (gnus-message 7 "No more %sarticles" (if mark "" "unread ")))
9887     (gnus-summary-recenter)
9888     (gnus-summary-position-point)
9889     (gnus-set-mode-line 'summary)
9890     n))
9891
9892 (gnus-summary-make-all-marking-commands)
9893
9894 (gnus-ems-redefine)
9895
9896 (provide 'gnus-sum)
9897
9898 (run-hooks 'gnus-sum-load-hook)
9899
9900 ;;; gnus-sum.el ends here