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

   1 ;;; gnus-registry.el --- article registry for Gnus
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Ted Zlatanov <tzz@lifelogs.com>
   7 ;; Keywords: news
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; This is the gnus-registry.el package, which works with all
  29 ;; backends, not just nnmail (e.g. NNTP).  The major issue is that it
  30 ;; doesn't go across backends, so for instance if an article is in
  31 ;; nnml:sys and you see a reference to it in nnimap splitting, the
  32 ;; article will end up in nnimap:sys
  33
  34 ;; gnus-registry.el intercepts article respooling, moving, deleting,
  35 ;; and copying for all backends.  If it doesn't work correctly for
  36 ;; you, submit a bug report and I'll be glad to fix it.  It needs
  37 ;; documentation in the manual (also on my to-do list).
  38
  39 ;; Put this in your startup file (~/.gnus.el for instance)
  40
  41 ;; (setq gnus-registry-max-entries 2500
  42 ;;       gnus-registry-use-long-group-names t)
  43
  44 ;; (gnus-registry-initialize)
  45
  46 ;; Then use this in your fancy-split:
  47
  48 ;; (: gnus-registry-split-fancy-with-parent)
  49
  50 ;; TODO:
  51
  52 ;; - get the correct group on spool actions
  53
  54 ;; - articles that are spooled to a different backend should be handled
  55
  56 ;;; Code:
  57
  58 (eval-when-compile (require 'cl))
  59
  60 (require 'gnus)
  61 (require 'gnus-int)
  62 (require 'gnus-sum)
  63 (require 'gnus-util)
  64 (require 'nnmail)
  65
  66 (defvar gnus-registry-dirty t
  67  "Boolean set to t when the registry is modified")
  68
  69 (defgroup gnus-registry nil
  70   "The Gnus registry."
  71   :version "22.1"
  72   :group 'gnus)
  73
  74 (defvar gnus-registry-hashtb (make-hash-table
  75                               :size 256
  76                               :test 'equal)
  77   "*The article registry by Message ID.")
  78
  79 (defcustom gnus-registry-unfollowed-groups '("delayed$" "drafts$" "queue$" "INBOX$")
  80   "List of groups that gnus-registry-split-fancy-with-parent won't return.
  81 The group names are matched, they don't have to be fully
  82 qualified.  This parameter tells the Registry 'never split a
  83 message into a group that matches one of these, regardless of
  84 references.'"
  85   :group 'gnus-registry
  86   :type '(repeat regexp))
  87
  88 (defcustom gnus-registry-install nil
  89   "Whether the registry should be installed."
  90   :group 'gnus-registry
  91   :type 'boolean)
  92
  93 (defcustom gnus-registry-clean-empty t
  94   "Whether the empty registry entries should be deleted.
  95 Registry entries are considered empty when they have no groups
  96 and no extra data."
  97   :group 'gnus-registry
  98   :type 'boolean)
  99
 100 (defcustom gnus-registry-use-long-group-names nil
 101   "Whether the registry should use long group names (BUGGY)."
 102   :group 'gnus-registry
 103   :type 'boolean)
 104
 105 (defcustom gnus-registry-track-extra nil
 106   "Whether the registry should track extra data about a message.
 107 The Subject and Sender (From:) headers are currently tracked this
 108 way."
 109   :group 'gnus-registry
 110   :type
 111   '(set :tag "Tracking choices"
 112     (const :tag "Track by subject (Subject: header)" subject)
 113     (const :tag "Track by sender (From: header)"  sender)))
 114
 115 (defcustom gnus-registry-entry-caching t
 116   "Whether the registry should cache extra information."
 117   :group 'gnus-registry
 118   :type 'boolean)
 119
 120 (defcustom gnus-registry-minimum-subject-length 5
 121   "The minimum length of a subject before it's considered trackable."
 122   :group 'gnus-registry
 123   :type 'integer)
 124
 125 (defcustom gnus-registry-trim-articles-without-groups t
 126   "Whether the registry should clean out message IDs without groups."
 127   :group 'gnus-registry
 128   :type 'boolean)
 129
 130 (defcustom gnus-registry-cache-file
 131   (nnheader-concat
 132    (or gnus-dribble-directory gnus-home-directory "~/")
 133    ".gnus.registry.eld")
 134   "File where the Gnus registry will be stored."
 135   :group 'gnus-registry
 136   :type 'file)
 137
 138 (defcustom gnus-registry-max-entries nil
 139   "Maximum number of entries in the registry, nil for unlimited."
 140   :group 'gnus-registry
 141   :type '(radio (const :format "Unlimited " nil)
 142                 (integer :format "Maximum number: %v")))
 143
 144 (defun gnus-registry-track-subject-p ()
 145   (memq 'subject gnus-registry-track-extra))
 146
 147 (defun gnus-registry-track-sender-p ()
 148   (memq 'sender gnus-registry-track-extra))
 149
 150 (defun gnus-registry-cache-read ()
 151   "Read the registry cache file."
 152   (interactive)
 153   (let ((file gnus-registry-cache-file))
 154     (when (file-exists-p file)
 155       (gnus-message 5 "Reading %s..." file)
 156       (gnus-load file)
 157       (gnus-message 5 "Reading %s...done" file))))
 158
 159 ;; FIXME: Get rid of duplicated code, cf. `gnus-save-newsrc-file' in
 160 ;; `gnus-start.el'.  --rsteib
 161 (defun gnus-registry-cache-save ()
 162   "Save the registry cache file."
 163   (interactive)
 164   (let ((file gnus-registry-cache-file))
 165     (save-excursion
 166       (set-buffer (gnus-get-buffer-create " *Gnus-registry-cache*"))
 167       (make-local-variable 'version-control)
 168     (setq version-control gnus-backup-startup-file)
 169     (setq buffer-file-name file)
 170     (setq default-directory (file-name-directory buffer-file-name))
 171     (buffer-disable-undo)
 172     (erase-buffer)
 173     (gnus-message 5 "Saving %s..." file)
 174     (if gnus-save-startup-file-via-temp-buffer
 175         (let ((coding-system-for-write gnus-ding-file-coding-system)
 176               (standard-output (current-buffer)))
 177           (gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist)
 178           (gnus-registry-cache-whitespace file)
 179           (save-buffer))
 180       (let ((coding-system-for-write gnus-ding-file-coding-system)
 181             (version-control gnus-backup-startup-file)
 182             (startup-file file)
 183             (working-dir (file-name-directory file))
 184             working-file
 185             (i -1))
 186         ;; Generate the name of a non-existent file.
 187         (while (progn (setq working-file
 188                             (format
 189                              (if (and (eq system-type 'ms-dos)
 190                                       (not (gnus-long-file-names)))
 191                                  "%s#%d.tm#" ; MSDOS limits files to 8+3
 192                                (if (memq system-type '(vax-vms axp-vms))
 193                                    "%s$tmp$%d"
 194                                  "%s#tmp#%d"))
 195                              working-dir (setq i (1+ i))))
 196                       (file-exists-p working-file)))
 197
 198         (unwind-protect
 199             (progn
 200               (gnus-with-output-to-file working-file
 201                 (gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist))
 202
 203               ;; These bindings will mislead the current buffer
 204               ;; into thinking that it is visiting the startup
 205               ;; file.
 206               (let ((buffer-backed-up nil)
 207                     (buffer-file-name startup-file)
 208                     (file-precious-flag t)
 209                     (setmodes (file-modes startup-file)))
 210                 ;; Backup the current version of the startup file.
 211                 (backup-buffer)
 212
 213                 ;; Replace the existing startup file with the temp file.
 214                 (rename-file working-file startup-file t)
 215                 (gnus-set-file-modes startup-file setmodes)))
 216           (condition-case nil
 217               (delete-file working-file)
 218             (file-error nil)))))
 219
 220     (gnus-kill-buffer (current-buffer))
 221     (gnus-message 5 "Saving %s...done" file))))
 222
 223 ;; Idea from Dan Christensen <jdc@chow.mat.jhu.edu>
 224 ;; Save the gnus-registry file with extra line breaks.
 225 (defun gnus-registry-cache-whitespace (filename)
 226   (gnus-message 7 "Adding whitespace to %s" filename)
 227   (save-excursion
 228     (goto-char (point-min))
 229     (while (re-search-forward "^(\\|(\\\"" nil t)
 230       (replace-match "\n\\&" t))
 231     (goto-char (point-min))
 232     (while (re-search-forward " $" nil t)
 233       (replace-match "" t t))))
 234
 235 (defun gnus-registry-save (&optional force)
 236   (when (or gnus-registry-dirty force)
 237     (let ((caching gnus-registry-entry-caching))
 238       ;; turn off entry caching, so mtime doesn't get recorded
 239       (setq gnus-registry-entry-caching nil)
 240       ;; remove entry caches
 241       (maphash
 242        (lambda (key value)
 243          (if (hash-table-p value)
 244              (remhash key gnus-registry-hashtb)))
 245        gnus-registry-hashtb)
 246       ;; remove empty entries
 247       (when gnus-registry-clean-empty
 248         (gnus-registry-clean-empty-function))
 249       ;; now trim and clean text properties from the registry appropriately
 250       (setq gnus-registry-alist
 251             (gnus-registry-remove-alist-text-properties
 252              (gnus-registry-trim
 253               (gnus-hashtable-to-alist
 254                gnus-registry-hashtb))))
 255       ;; really save
 256       (gnus-registry-cache-save)
 257       (setq gnus-registry-entry-caching caching)
 258       (setq gnus-registry-dirty nil))))
 259
 260 (defun gnus-registry-clean-empty-function ()
 261   "Remove all empty entries from the registry.  Returns count thereof."
 262   (let ((count 0))
 263
 264     (maphash
 265      (lambda (key value)
 266        (when (stringp key)
 267          (dolist (group (gnus-registry-fetch-groups key))
 268            (when (gnus-parameter-registry-ignore group)
 269              (gnus-message
 270               10
 271               "gnus-registry: deleted ignored group %s from key %s"
 272               group key)
 273              (gnus-registry-delete-group key group)))
 274
 275          (unless (gnus-registry-group-count key)
 276            (gnus-registry-delete-id key))
 277
 278          (unless (or
 279                   (gnus-registry-fetch-group key)
 280                   ;; TODO: look for specific extra data here!
 281                   ;; in this example, we look for 'label
 282                   (gnus-registry-fetch-extra key 'label))
 283            (incf count)
 284            (gnus-registry-delete-id key))
 285
 286          (unless (stringp key)
 287            (gnus-message
 288             10
 289             "gnus-registry key %s was not a string, removing"
 290             key)
 291            (gnus-registry-delete-id key))))
 292
 293      gnus-registry-hashtb)
 294     count))
 295
 296 (defun gnus-registry-read ()
 297   (gnus-registry-cache-read)
 298   (setq gnus-registry-hashtb (gnus-alist-to-hashtable gnus-registry-alist))
 299   (setq gnus-registry-dirty nil))
 300
 301 (defun gnus-registry-remove-alist-text-properties (v)
 302   "Remove text properties from all strings in alist."
 303   (if (stringp v)
 304       (gnus-string-remove-all-properties v)
 305     (if (and (listp v) (listp (cdr v)))
 306         (mapcar 'gnus-registry-remove-alist-text-properties v)
 307       (if (and (listp v) (stringp (cdr v)))
 308           (cons (gnus-registry-remove-alist-text-properties (car v))
 309                 (gnus-registry-remove-alist-text-properties (cdr v)))
 310       v))))
 311
 312 (defun gnus-registry-trim (alist)
 313   "Trim alist to size, using gnus-registry-max-entries.
 314 Also, drop all gnus-registry-ignored-groups matches."
 315   (if (null gnus-registry-max-entries)
 316       alist                             ; just return the alist
 317     ;; else, when given max-entries, trim the alist
 318     (let* ((timehash (make-hash-table
 319                       :size 4096
 320                       :test 'equal))
 321            (trim-length (- (length alist) gnus-registry-max-entries))
 322            (trim-length (if (natnump trim-length) trim-length 0)))
 323       (maphash
 324        (lambda (key value)
 325          (puthash key (gnus-registry-fetch-extra key 'mtime) timehash))
 326        gnus-registry-hashtb)
 327
 328       ;; we use the return value of this setq, which is the trimmed alist
 329       (setq alist
 330             (nthcdr
 331              trim-length
 332              (sort alist
 333                    (lambda (a b)
 334                      (time-less-p
 335                       (or (cdr (gethash (car a) timehash)) '(0 0 0))
 336                       (or (cdr (gethash (car b) timehash)) '(0 0 0))))))))))
 337
 338 (defun gnus-registry-action (action data-header from &optional to method)
 339   (let* ((id (mail-header-id data-header))
 340          (subject (gnus-string-remove-all-properties
 341                    (gnus-registry-simplify-subject
 342                     (mail-header-subject data-header))))
 343          (sender (gnus-string-remove-all-properties (mail-header-from data-header)))
 344          (from (gnus-group-guess-full-name-from-command-method from))
 345          (to (if to (gnus-group-guess-full-name-from-command-method to) nil))
 346          (to-name (if to to "the Bit Bucket"))
 347          (old-entry (gethash id gnus-registry-hashtb)))
 348     (gnus-message 7 "Registry: article %s %s from %s to %s"
 349                   id
 350                   (if method "respooling" "going")
 351                   from
 352                   to)
 353
 354     ;; All except copy will need a delete
 355     (gnus-registry-delete-group id from)
 356
 357     (when (equal 'copy action)
 358       (gnus-registry-add-group id from subject sender)) ; undo the delete
 359
 360     (gnus-registry-add-group id to subject sender)))
 361
 362 (defun gnus-registry-spool-action (id group &optional subject sender)
 363   (let ((group (gnus-group-guess-full-name-from-command-method group)))
 364     (when (and (stringp id) (string-match "\r$" id))
 365       (setq id (substring id 0 -1)))
 366     (gnus-message 7 "Registry: article %s spooled to %s"
 367                   id
 368                   group)
 369     (gnus-registry-add-group id group subject sender)))
 370
 371 ;; Function for nn{mail|imap}-split-fancy: look up all references in
 372 ;; the cache and if a match is found, return that group.
 373 (defun gnus-registry-split-fancy-with-parent ()
 374   "Split this message into the same group as its parent.  The parent
 375 is obtained from the registry.  This function can be used as an entry
 376 in `nnmail-split-fancy' or `nnimap-split-fancy', for example like
 377 this: (: gnus-registry-split-fancy-with-parent)
 378
 379 This function tracks ALL backends, unlike
 380 `nnmail-split-fancy-with-parent' which tracks only nnmail
 381 messages.
 382
 383 For a message to be split, it looks for the parent message in the
 384 References or In-Reply-To header and then looks in the registry
 385 to see which group that message was put in.  This group is
 386 returned, unless it matches one of the entries in
 387 gnus-registry-unfollowed-groups or
 388 nnmail-split-fancy-with-parent-ignore-groups.
 389
 390 See the Info node `(gnus)Fancy Mail Splitting' for more details."
 391   (let* ((refstr (or (message-fetch-field "references") "")) ; guarantee string
 392          (reply-to (message-fetch-field "in-reply-to"))      ; grab reply-to
 393          ;; now, if reply-to is valid, append it to the References
 394          (refstr (if reply-to
 395                      (concat refstr " " reply-to)
 396                    refstr))
 397         (nnmail-split-fancy-with-parent-ignore-groups
 398          (if (listp nnmail-split-fancy-with-parent-ignore-groups)
 399              nnmail-split-fancy-with-parent-ignore-groups
 400            (list nnmail-split-fancy-with-parent-ignore-groups)))
 401         res)
 402     ;; the references string must be valid and parse to valid references
 403     (if (and refstr (gnus-extract-references refstr))
 404         (dolist (reference (nreverse (gnus-extract-references refstr)))
 405           (setq res (or (gnus-registry-fetch-group reference) res))
 406           (when (or (gnus-registry-grep-in-list
 407                      res
 408                      gnus-registry-unfollowed-groups)
 409                     (gnus-registry-grep-in-list
 410                      res
 411                      nnmail-split-fancy-with-parent-ignore-groups))
 412             (setq res nil)))
 413
 414       ;; else: there were no references, now try the extra tracking
 415       (let ((sender (gnus-string-remove-all-properties(message-fetch-field "from")))
 416             (subject (gnus-string-remove-all-properties
 417                       (gnus-registry-simplify-subject
 418                        (message-fetch-field "subject"))))
 419             (single-match t))
 420         (when (and single-match
 421                    (gnus-registry-track-sender-p)
 422                    sender)
 423           (maphash
 424            (lambda (key value)
 425              (let ((this-sender (cdr
 426                                  (gnus-registry-fetch-extra key 'sender))))
 427                (when (and single-match
 428                           this-sender
 429                           (equal sender this-sender))
 430                  ;; too many matches, bail
 431                  (unless (equal res (gnus-registry-fetch-group key))
 432                    (setq single-match nil))
 433                  (setq res (gnus-registry-fetch-group key))
 434                  (when (and sender res)
 435                    (gnus-message
 436                     ;; raise level of messaging if gnus-registry-track-extra
 437                     (if gnus-registry-track-extra 7 9)
 438                     "%s (extra tracking) traced sender %s to group %s"
 439                     "gnus-registry-split-fancy-with-parent"
 440                     sender
 441                     res)))))
 442            gnus-registry-hashtb))
 443         (when (and single-match
 444                    (gnus-registry-track-subject-p)
 445                    subject
 446                    (< gnus-registry-minimum-subject-length (length subject)))
 447           (maphash
 448            (lambda (key value)
 449              (let ((this-subject (cdr
 450                                   (gnus-registry-fetch-extra key 'subject))))
 451                (when (and single-match
 452                           this-subject
 453                           (equal subject this-subject))
 454                  ;; too many matches, bail
 455                  (unless (equal res (gnus-registry-fetch-group key))
 456                    (setq single-match nil))
 457                  (setq res (gnus-registry-fetch-group key))
 458                  (when (and subject res)
 459                    (gnus-message
 460                     ;; raise level of messaging if gnus-registry-track-extra
 461                     (if gnus-registry-track-extra 7 9)
 462                     "%s (extra tracking) traced subject %s to group %s"
 463                     "gnus-registry-split-fancy-with-parent"
 464                     subject
 465                     res)))))
 466            gnus-registry-hashtb))
 467         (unless single-match
 468           (gnus-message
 469            3
 470            "gnus-registry-split-fancy-with-parent: too many extra matches for %s"
 471            refstr)
 472           (setq res nil))))
 473     (when (and refstr res)
 474       (gnus-message
 475        5
 476        "gnus-registry-split-fancy-with-parent traced %s to group %s"
 477        refstr res))
 478
 479     (when (and res gnus-registry-use-long-group-names)
 480       (let ((m1 (gnus-find-method-for-group res))
 481             (m2 (or gnus-command-method
 482                     (gnus-find-method-for-group gnus-newsgroup-name)))
 483             (short-res (gnus-group-short-name res)))
 484       (if (gnus-methods-equal-p m1 m2)
 485           (progn
 486             (gnus-message
 487              9
 488              "gnus-registry-split-fancy-with-parent stripped group %s to %s"
 489              res
 490              short-res)
 491             (setq res short-res))
 492         ;; else...
 493         (gnus-message
 494          7
 495          "gnus-registry-split-fancy-with-parent ignored foreign group %s"
 496          res)
 497         (setq res nil))))
 498     res))
 499
 500 (defun gnus-registry-wash-for-keywords (&optional force)
 501   (interactive)
 502   (let ((id (gnus-registry-fetch-message-id-fast gnus-current-article))
 503         word words)
 504     (if (or (not (gnus-registry-fetch-extra id 'keywords))
 505             force)
 506         (save-excursion
 507           (set-buffer gnus-article-buffer)
 508           (article-goto-body)
 509           (save-window-excursion
 510             (save-restriction
 511               (narrow-to-region (point) (point-max))
 512               (with-syntax-table gnus-adaptive-word-syntax-table
 513                 (while (re-search-forward "\\b\\w+\\b" nil t)
 514                   (setq word (gnus-registry-remove-alist-text-properties
 515                               (downcase (buffer-substring
 516                                          (match-beginning 0) (match-end 0)))))
 517                   (if (> (length word) 3)
 518                       (push word words))))))
 519           (gnus-registry-store-extra-entry id 'keywords words)))))
 520
 521 (defun gnus-registry-find-keywords (keyword)
 522   (interactive "skeyword: ")
 523   (let (articles)
 524     (maphash
 525      (lambda (key value)
 526        (when (gnus-registry-grep-in-list
 527               keyword
 528               (cdr (gnus-registry-fetch-extra key 'keywords)))
 529          (push key articles)))
 530      gnus-registry-hashtb)
 531     articles))
 532
 533 (defun gnus-registry-register-message-ids ()
 534   "Register the Message-ID of every article in the group"
 535   (unless (gnus-parameter-registry-ignore gnus-newsgroup-name)
 536     (dolist (article gnus-newsgroup-articles)
 537       (let ((id (gnus-registry-fetch-message-id-fast article)))
 538         (unless (gnus-registry-fetch-group id)
 539           (gnus-message 9 "Registry: Registering article %d with group %s"
 540                         article gnus-newsgroup-name)
 541           (gnus-registry-add-group
 542            (gnus-registry-fetch-message-id-fast article)
 543            gnus-newsgroup-name
 544            (gnus-registry-fetch-simplified-message-subject-fast article)
 545            (gnus-registry-fetch-sender-fast article)))))))
 546
 547 (defun gnus-registry-fetch-message-id-fast (article)
 548   "Fetch the Message-ID quickly, using the internal gnus-data-list function"
 549   (if (and (numberp article)
 550            (assoc article (gnus-data-list nil)))
 551       (mail-header-id (gnus-data-header (assoc article (gnus-data-list nil))))
 552     nil))
 553
 554 (defun gnus-registry-simplify-subject (subject)
 555   (if (stringp subject)
 556       (gnus-simplify-subject subject)
 557     nil))
 558
 559 (defun gnus-registry-fetch-simplified-message-subject-fast (article)
 560   "Fetch the Subject quickly, using the internal gnus-data-list function"
 561   (if (and (numberp article)
 562            (assoc article (gnus-data-list nil)))
 563       (gnus-string-remove-all-properties
 564        (gnus-registry-simplify-subject
 565         (mail-header-subject (gnus-data-header
 566                               (assoc article (gnus-data-list nil))))))
 567     nil))
 568
 569 (defun gnus-registry-fetch-sender-fast (article)
 570   "Fetch the Sender quickly, using the internal gnus-data-list function"
 571   (if (and (numberp article)
 572            (assoc article (gnus-data-list nil)))
 573       (gnus-string-remove-all-properties
 574        (mail-header-from (gnus-data-header
 575                           (assoc article (gnus-data-list nil)))))
 576     nil))
 577
 578 (defun gnus-registry-grep-in-list (word list)
 579   (when word
 580     (memq nil
 581           (mapcar 'not
 582                   (mapcar
 583                    (lambda (x)
 584                      (string-match word x))
 585                    list)))))
 586
 587 ;;; if this extends to more than 'flags, it should be improved to be more generic.
 588 (defun gnus-registry-fetch-extra-flags (id)
 589   "Get the flags of a message, based on the message ID.
 590 Returns a list of symbol flags or nil."
 591   (car-safe (cdr (gnus-registry-fetch-extra id 'flags))))
 592
 593 (defun gnus-registry-has-extra-flag (id flag)
 594   "Checks if a message has `flag', based on the message ID."
 595   (memq flag (gnus-registry-fetch-extra-flags id)))
 596
 597 (defun gnus-registry-store-extra-flags (id &rest flag-list)
 598   "Set the flags of a message, based on the message ID.
 599 The `flag-list' can be nil, in which case no flags are left."
 600   (gnus-registry-store-extra-entry id 'flags (list flag-list)))
 601
 602 (defun gnus-registry-delete-extra-flags (id &rest flag-delete-list)
 603   "Delete the message flags in `flag-delete-list', based on the message ID."
 604   (let ((flags (gnus-registry-fetch-extra-flags id)))
 605     (when flags
 606       (dolist (flag flag-delete-list)
 607         (setq flags (delq flag flags))))
 608     (gnus-registry-store-extra-flags id (car flags))))
 609
 610 (defun gnus-registry-delete-all-extra-flags (id)
 611   "Delete all the flags for a message ID."
 612   (gnus-registry-store-extra-flags id nil))
 613
 614 (defun gnus-registry-fetch-extra (id &optional entry)
 615   "Get the extra data of a message, based on the message ID.
 616 Returns the first place where the trail finds a nonstring."
 617   (let ((entry-cache (gethash entry gnus-registry-hashtb)))
 618     (if (and entry
 619              (hash-table-p entry-cache)
 620              (gethash id entry-cache))
 621         (gethash id entry-cache)
 622       ;; else, if there is no caching possible...
 623       (let ((trail (gethash id gnus-registry-hashtb)))
 624         (when (listp trail)
 625           (dolist (crumb trail)
 626             (unless (stringp crumb)
 627               (return (gnus-registry-fetch-extra-entry crumb entry id)))))))))
 628
 629 (defun gnus-registry-fetch-extra-entry (alist &optional entry id)
 630   "Get the extra data of a message, or a specific entry in it.
 631 Update the entry cache if needed."
 632   (if (and entry id)
 633       (let ((entry-cache (gethash entry gnus-registry-hashtb))
 634             entree)
 635         (when gnus-registry-entry-caching
 636           ;; create the hash table
 637           (unless (hash-table-p entry-cache)
 638             (setq entry-cache (make-hash-table
 639                                :size 4096
 640                                :test 'equal))
 641             (puthash entry entry-cache gnus-registry-hashtb))
 642
 643           ;; get the entree from the hash table or from the alist
 644           (setq entree (gethash id entry-cache)))
 645
 646         (unless entree
 647           (setq entree (assq entry alist))
 648           (when gnus-registry-entry-caching
 649             (puthash id entree entry-cache)))
 650         entree)
 651     alist))
 652
 653 (defun gnus-registry-store-extra (id extra)
 654   "Store the extra data of a message, based on the message ID.
 655 The message must have at least one group name."
 656   (when (gnus-registry-group-count id)
 657     ;; we now know the trail has at least 1 group name, so it's not empty
 658     (let ((trail (gethash id gnus-registry-hashtb))
 659           (old-extra (gnus-registry-fetch-extra id))
 660           entry-cache)
 661       (dolist (crumb trail)
 662         (unless (stringp crumb)
 663           (dolist (entry crumb)
 664             (setq entry-cache (gethash (car entry) gnus-registry-hashtb))
 665           (when entry-cache
 666             (remhash id entry-cache))))
 667       (puthash id (cons extra (delete old-extra trail))
 668                gnus-registry-hashtb)
 669       (setq gnus-registry-dirty t)))))
 670
 671 (defun gnus-registry-delete-extra-entry (id key)
 672   "Delete a specific entry in the extras field of the registry entry for id."
 673   (gnus-registry-store-extra-entry id key nil))
 674
 675 (defun gnus-registry-store-extra-entry (id key value)
 676   "Put a specific entry in the extras field of the registry entry for id."
 677   (let* ((extra (gnus-registry-fetch-extra id))
 678          ;; all the entries except the one for `key'
 679          (the-rest (gnus-assq-delete-all key (gnus-registry-fetch-extra id)))
 680          (alist (if value
 681                     (gnus-registry-remove-alist-text-properties
 682                      (cons (cons key value)
 683                            the-rest))
 684                   the-rest)))
 685     (gnus-registry-store-extra id alist)))
 686
 687 (defun gnus-registry-fetch-group (id)
 688   "Get the group of a message, based on the message ID.
 689 Returns the first place where the trail finds a group name."
 690   (when (gnus-registry-group-count id)
 691     ;; we now know the trail has at least 1 group name
 692     (let ((trail (gethash id gnus-registry-hashtb)))
 693       (dolist (crumb trail)
 694         (when (stringp crumb)
 695           (return (if gnus-registry-use-long-group-names
 696                        crumb
 697                      (gnus-group-short-name crumb))))))))
 698
 699 (defun gnus-registry-fetch-groups (id)
 700   "Get the groups of a message, based on the message ID."
 701   (let ((trail (gethash id gnus-registry-hashtb))
 702         groups)
 703     (dolist (crumb trail)
 704       (when (stringp crumb)
 705         ;; push the group name into the list
 706         (setq
 707          groups
 708          (cons
 709           (if (or (not (stringp crumb)) gnus-registry-use-long-group-names)
 710               crumb
 711             (gnus-group-short-name crumb))
 712          groups))))
 713     ;; return the list of groups
 714     groups))
 715
 716 (defun gnus-registry-group-count (id)
 717   "Get the number of groups of a message, based on the message ID."
 718   (let ((trail (gethash id gnus-registry-hashtb)))
 719     (if (and trail (listp trail))
 720         (apply '+ (mapcar (lambda (x) (if (stringp x) 1 0)) trail))
 721       0)))
 722
 723 (defun gnus-registry-delete-group (id group)
 724   "Delete a group for a message, based on the message ID."
 725   (when (and group id)
 726       (let ((trail (gethash id gnus-registry-hashtb))
 727             (short-group (gnus-group-short-name group)))
 728         (puthash id (if trail
 729                         (delete short-group (delete group trail))
 730                       nil)
 731                  gnus-registry-hashtb))
 732       ;; now, clear the entry if there are no more groups
 733       (when gnus-registry-trim-articles-without-groups
 734         (unless (gnus-registry-group-count id)
 735           (gnus-registry-delete-id id)))
 736       ;; is this ID still in the registry?
 737       (when (gethash id gnus-registry-hashtb)
 738         (gnus-registry-store-extra-entry id 'mtime (current-time)))))
 739
 740 (defun gnus-registry-delete-id (id)
 741   "Delete a message ID from the registry."
 742   (when (stringp id)
 743     (remhash id gnus-registry-hashtb)
 744     (maphash
 745      (lambda (key value)
 746        (when (hash-table-p value)
 747          (remhash id value)))
 748      gnus-registry-hashtb)))
 749
 750 (defun gnus-registry-add-group (id group &optional subject sender)
 751   "Add a group for a message, based on the message ID."
 752   (when group
 753     (when (and id
 754                (not (string-match "totally-fudged-out-message-id" id)))
 755       (let ((full-group group)
 756             (group (if gnus-registry-use-long-group-names
 757                        group
 758                      (gnus-group-short-name group))))
 759         (gnus-registry-delete-group id group)
 760
 761         (unless gnus-registry-use-long-group-names ;; unnecessary in this case
 762           (gnus-registry-delete-group id full-group))
 763
 764         (let ((trail (gethash id gnus-registry-hashtb)))
 765           (puthash id (if trail
 766                           (cons group trail)
 767                         (list group))
 768                    gnus-registry-hashtb)
 769
 770           (when (and (gnus-registry-track-subject-p)
 771                      subject)
 772             (gnus-registry-store-extra-entry
 773              id
 774              'subject
 775              (gnus-registry-simplify-subject subject)))
 776           (when (and (gnus-registry-track-sender-p)
 777                      sender)
 778             (gnus-registry-store-extra-entry
 779              id
 780              'sender
 781              sender))
 782
 783           (gnus-registry-store-extra-entry id 'mtime (current-time)))))))
 784
 785 (defun gnus-registry-clear ()
 786   "Clear the Gnus registry."
 787   (interactive)
 788   (setq gnus-registry-alist nil)
 789   (setq gnus-registry-hashtb (gnus-alist-to-hashtable gnus-registry-alist))
 790   (setq gnus-registry-dirty t))
 791
 792 ;;;###autoload
 793 (defun gnus-registry-initialize ()
 794   (interactive)
 795   (setq gnus-registry-install t)
 796   (gnus-registry-install-hooks)
 797   (gnus-registry-read))
 798
 799 ;;;###autoload
 800 (defun gnus-registry-install-hooks ()
 801   "Install the registry hooks."
 802   (interactive)
 803   (add-hook 'gnus-summary-article-move-hook 'gnus-registry-action)
 804   (add-hook 'gnus-summary-article-delete-hook 'gnus-registry-action)
 805   (add-hook 'gnus-summary-article-expire-hook 'gnus-registry-action)
 806   (add-hook 'nnmail-spool-hook 'gnus-registry-spool-action)
 807
 808   (add-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
 809   (add-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
 810
 811   (add-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
 812
 813 (defun gnus-registry-unload-hook ()
 814   "Uninstall the registry hooks."
 815   (interactive)
 816   (remove-hook 'gnus-summary-article-move-hook 'gnus-registry-action)
 817   (remove-hook 'gnus-summary-article-delete-hook 'gnus-registry-action)
 818   (remove-hook 'gnus-summary-article-expire-hook 'gnus-registry-action)
 819   (remove-hook 'nnmail-spool-hook 'gnus-registry-spool-action)
 820
 821   (remove-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
 822   (remove-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
 823
 824   (remove-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
 825
 826 (add-hook 'gnus-registry-unload-hook 'gnus-registry-unload-hook)
 827
 828 (when gnus-registry-install
 829   (gnus-registry-install-hooks)
 830   (gnus-registry-read))
 831
 832 ;; TODO: a lot of things
 833
 834 (provide 'gnus-registry)
 835
 836 ;;; arch-tag: 5cba0a32-718a-4a97-8c91-0a15af21da94
 837 ;;; gnus-registry.el ends here