code.delx.au - gnu-emacs/blob - lisp/obsolete/rnews.el

   1 ;;; rnews.el --- USENET news reader for GNU Emacs
   2
   3 ;; Copyright (C) 1985, 1986, 1987, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   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 file has been obsolete since Emacs 21.1.
  29
  30 ;;; Change Log:
  31
  32 ;; Created Sun Mar 10,1985 at 21:35:01 ads and sundar@hernes.ai.mit.edu
  33 ;; Should do the point pdl stuff sometime
  34 ;; finito except pdl.... Sat Mar 16,1985 at 06:43:44
  35 ;; lets keep the summary stuff out until we get it working ..
  36 ;;      sundar@hermes.ai.mit.edu Wed Apr 10,1985 at 16:32:06
  37 ;; hack slash maim. mly@gnu.org Thu 18 Apr, 1985 06:11:14
  38 ;; modified to correct reentrance bug, to not bother with groups that
  39 ;;   received no new traffic since last read completely, to find out
  40 ;;   what traffic a group has available much more quickly when
  41 ;;   possible, to do some completing reads for group names - should
  42 ;;   be much faster...
  43 ;;      KING@KESTREL.arpa, Thu Mar 13 09:03:28 1986
  44 ;; made news-{next,previous}-group skip groups with no new messages; and
  45 ;; added checking for unsubscribed groups to news-add-news-group
  46 ;;      tower@gnu.org Jul 18 1986
  47 ;; bound rmail-output to C-o; and changed header-field commands binding to
  48 ;; agree with the new C-c C-f usage in sendmail
  49 ;;      tower@gnu.org Sep  3 1986
  50 ;; added news-rotate-buffer-body
  51 ;;      tower@gnu.org Oct 17 1986
  52 ;; made messages more user friendly, cleaned up news-inews
  53 ;; move posting and mail code to new file rnewpost.el
  54 ;;      tower@gnu.org Oct 29 1986
  55 ;; added caesar-region, rename news-caesar-buffer-body, hacked accordingly
  56 ;;      tower@gnu.org Nov 21 1986
  57 ;; added tower@gnu.org 22 Apr 87
  58
  59 ;;; Code:
  60
  61 (require 'mail-utils)
  62 (require 'sendmail)
  63
  64 (defvar caesar-translate-table)
  65 (defvar minor-modes)
  66 (defvar news-buffer-save)
  67 (defvar news-group-name)
  68 (defvar news-minor-modes)
  69
  70 (autoload 'rmail-output "rmailout"
  71   "Append this message to Unix mail file named FILE-NAME."
  72   t)
  73
  74 (autoload 'news-reply "rnewspost"
  75   "Compose and post a reply to the current article on USENET.
  76 While composing the reply, use \\[mail-yank-original] to yank the original
  77 message into it."
  78   t)
  79
  80 (autoload 'news-mail-other-window "rnewspost"
  81   "Send mail in another window.
  82 While composing the message, use \\[mail-yank-original] to yank the
  83 original message into it."
  84   t)
  85
  86 (autoload 'news-post-news "rnewspost"
  87   "Begin editing a new USENET news article to be posted."
  88   t)
  89
  90 (autoload 'news-mail-reply "rnewspost"
  91   "Mail a reply to the author of the current article.
  92 While composing the reply, use \\[mail-yank-original] to yank the original
  93 message into it."
  94   t)
  95
  96 (defvar news-group-hook-alist nil
  97   "Alist of (GROUP-REGEXP . HOOK) pairs.
  98 Just before displaying a message, each HOOK is called
  99 if its GROUP-REGEXP matches the current newsgroup name.")
 100
 101 (defvar rmail-last-file (expand-file-name "~/mbox.news"))
 102
 103 ;Now in paths.el.
 104 ;(defvar news-path "/usr/spool/news/"
 105 ;  "The root directory below which all news files are stored.")
 106
 107 (defvar news-startup-file "$HOME/.newsrc" "Contains ~/.newsrc")
 108 (defvar news-certification-file "$HOME/.news-dates" "Contains ~/.news-dates")
 109
 110 ;; random headers that we decide to ignore.
 111 (defvar news-ignored-headers
 112   "^Path:\\|^Posting-Version:\\|^Article-I.D.:\\|^Expires:\\|^Date-Received:\\|^References:\\|^Control:\\|^Xref:\\|^Lines:\\|^Posted:\\|^Relay-Version:\\|^Message-ID:\\|^Nf-ID:\\|^Nf-From:\\|^Approved:\\|^Sender:"
 113   "All random fields within the header of a message.")
 114
 115 (defvar news-mode-map nil)
 116 (defvar news-read-first-time-p t)
 117 ;; Contains the (dotified) news groups of which you are a member.
 118 (defvar news-user-group-list nil)
 119
 120 (defvar news-current-news-group nil)
 121 (defvar news-current-group-begin nil)
 122 (defvar news-current-group-end  nil)
 123 (defvar news-current-certifications nil
 124         "An assoc list of a group name and the time at which it is
 125 known that the group had no new traffic")
 126 (defvar news-current-certifiable nil
 127         "The time when the directory we are now working on was written")
 128
 129 (defvar news-message-filter nil
 130   "User specifiable filter function that will be called during
 131 formatting of the news file")
 132
 133 ;(defvar news-mode-group-string "Starting-Up"
 134 ;  "Mode line group name info is held in this variable")
 135 (defvar news-list-of-files nil
 136   "Global variable in which we store the list of files
 137 associated with the current newsgroup")
 138 (defvar news-list-of-files-possibly-bogus nil
 139   "variable indicating we only are guessing at which files are available.
 140 Not currently used.")
 141
 142 ;; association list in which we store lists of the form
 143 ;; (pointified-group-name (first last old-last))
 144 (defvar news-group-article-assoc nil)
 145
 146 (defvar news-current-message-number 0 "Displayed Article Number")
 147 (defvar news-total-current-group 0 "Total no of messages in group")
 148
 149 (defvar news-unsubscribe-groups ())
 150 (defvar news-point-pdl () "List of visited news messages.")
 151 (defvar news-no-jumps-p t)
 152 (defvar news-buffer () "Buffer into which news files are read.")
 153
 154 (defmacro news-push (item ref)
 155   (list 'setq ref (list 'cons item ref)))
 156
 157 (defmacro news-cadr (x) (list 'car (list 'cdr x)))
 158 (defmacro news-cdar (x) (list 'cdr (list 'car x)))
 159 (defmacro news-caddr (x) (list 'car (list 'cdr (list 'cdr x))))
 160 (defmacro news-cadar (x) (list 'car (list 'cdr (list 'car x))))
 161 (defmacro news-caadr (x) (list 'car (list 'car (list 'cdr x))))
 162 (defmacro news-cdadr (x) (list 'cdr (list 'car (list 'cdr x))))
 163
 164 (defmacro news-wins (pfx index)
 165   `(file-exists-p (concat ,pfx "/" (int-to-string ,index))))
 166
 167 (defvar news-max-plausible-gap 2
 168         "* In an rnews directory, the maximum possible gap size.
 169 A gap is a sequence of missing messages between two messages that exist.
 170 An empty file does not contribute to a gap -- it ends one.")
 171
 172 (defun news-find-first-and-last (prefix base)
 173   (and (news-wins prefix base)
 174        (cons (news-find-first-or-last prefix base -1)
 175              (news-find-first-or-last prefix base 1))))
 176
 177 (defmacro news-/ (a1 a2)
 178 ;; a form of / that guarantees that (/ -1 2) = 0
 179   (if (zerop (/ -1 2))
 180       `(/ ,a1 ,a2)
 181     `(if (< ,a1 0)
 182          (- (/ (- ,a1) ,a2))
 183        (/ ,a1 ,a2))))
 184
 185 (defun news-find-first-or-last (pfx base dirn)
 186   ;; first use powers of two to find a plausible ceiling
 187   (let ((original-dir dirn))
 188     (while (news-wins pfx (+ base dirn))
 189       (setq dirn (* dirn 2)))
 190     (setq dirn (news-/ dirn 2))
 191     ;; Then use a binary search to find the high water mark
 192     (let ((offset (news-/ dirn 2)))
 193       (while (/= offset 0)
 194         (if (news-wins pfx (+ base dirn offset))
 195             (setq dirn (+ dirn offset)))
 196         (setq offset (news-/ offset 2))))
 197     ;; If this high-water mark is bogus, recurse.
 198     (let ((offset (* news-max-plausible-gap original-dir)))
 199       (while (and (/= offset 0) (not (news-wins pfx (+ base dirn offset))))
 200         (setq offset (- offset original-dir)))
 201       (if (= offset 0)
 202           (+ base dirn)
 203         (news-find-first-or-last pfx (+ base dirn offset) original-dir)))))
 204
 205 (defun rnews ()
 206 "Read USENET news for groups for which you are a member and add or
 207 delete groups.
 208 You can reply to articles posted and send articles to any group.
 209
 210 Type \\[describe-mode] once reading news to get a list of rnews commands."
 211   (interactive)
 212   (let ((last-buffer (buffer-name)))
 213     (make-local-variable 'rmail-last-file)
 214     (switch-to-buffer (setq news-buffer (get-buffer-create "*news*")))
 215     (news-mode)
 216     (setq news-buffer-save last-buffer)
 217     (setq buffer-read-only nil)
 218     (erase-buffer)
 219     (setq buffer-read-only t)
 220     (set-buffer-modified-p t)
 221     (sit-for 0)
 222     (message "Getting new USENET news...")
 223     (news-set-mode-line)
 224     (news-get-certifications)
 225     (news-get-new-news)))
 226
 227 (defun news-group-certification (group)
 228   (cdr-safe (assoc group news-current-certifications)))
 229
 230
 231 (defun news-set-current-certifiable ()
 232   ;; Record the date that corresponds to the directory you are about to check
 233   (let ((file (concat news-path
 234                       (string-subst-char ?/ ?. news-current-news-group))))
 235     (setq news-current-certifiable
 236           (nth 5 (file-attributes
 237                   (or (file-symlink-p file) file))))))
 238
 239 (defun news-get-certifications ()
 240   ;; Read the certified-read file from last session
 241   (save-excursion
 242     (save-window-excursion
 243       (setq news-current-certifications
 244             (car-safe
 245              (condition-case var
 246                  (let*
 247                      ((file (substitute-in-file-name news-certification-file))
 248                       (buf (find-file-noselect file)))
 249                    (and (file-exists-p file)
 250                         (progn
 251                           (switch-to-buffer buf 'norecord)
 252                           (unwind-protect
 253                               (read-from-string (buffer-string))
 254                             (kill-buffer buf)))))
 255                (error nil)))))))
 256
 257 (defun news-write-certifications ()
 258   ;; Write a certification file.
 259   ;; This is an assoc list of group names with doubletons that represent
 260   ;; mod times of the directory when group is read completely.
 261   (save-excursion
 262     (save-window-excursion
 263       (with-output-to-temp-buffer
 264           "*CeRtIfIcAtIoNs*"
 265           (print news-current-certifications))
 266       (let ((buf (get-buffer "*CeRtIfIcAtIoNs*")))
 267         (switch-to-buffer buf)
 268         (write-file (substitute-in-file-name news-certification-file))
 269         (kill-buffer buf)))))
 270
 271 (defun news-set-current-group-certification ()
 272   (let ((cgc (assoc news-current-news-group news-current-certifications)))
 273     (if cgc (setcdr cgc news-current-certifiable)
 274       (news-push (cons news-current-news-group news-current-certifiable)
 275                  news-current-certifications))))
 276
 277 (defun news-set-message-counters ()
 278   "Scan through current news-groups filelist to figure out how many messages
 279 are there. Set counters for use with minor mode display."
 280     (if (null news-list-of-files)
 281         (setq news-current-message-number 0)))
 282
 283 (if news-mode-map
 284     nil
 285   (setq news-mode-map (make-keymap))
 286   (suppress-keymap news-mode-map)
 287   (define-key news-mode-map "." 'beginning-of-buffer)
 288   (define-key news-mode-map " " 'scroll-up)
 289   (define-key news-mode-map "\177" 'scroll-down)
 290   (define-key news-mode-map "n" 'news-next-message)
 291   (define-key news-mode-map "c" 'news-make-link-to-message)
 292   (define-key news-mode-map "p" 'news-previous-message)
 293   (define-key news-mode-map "j" 'news-goto-message)
 294   (define-key news-mode-map "q" 'news-exit)
 295   (define-key news-mode-map "e" 'news-exit)
 296   (define-key news-mode-map "\ej" 'news-goto-news-group)
 297   (define-key news-mode-map "\en" 'news-next-group)
 298   (define-key news-mode-map "\ep" 'news-previous-group)
 299   (define-key news-mode-map "l" 'news-list-news-groups)
 300   (define-key news-mode-map "?" 'describe-mode)
 301   (define-key news-mode-map "g" 'news-get-new-news)
 302   (define-key news-mode-map "f" 'news-reply)
 303   (define-key news-mode-map "m" 'news-mail-other-window)
 304   (define-key news-mode-map "a" 'news-post-news)
 305   (define-key news-mode-map "r" 'news-mail-reply)
 306   (define-key news-mode-map "o" 'news-save-item-in-file)
 307   (define-key news-mode-map "\C-o" 'rmail-output)
 308   (define-key news-mode-map "t" 'news-show-all-headers)
 309   (define-key news-mode-map "x" 'news-force-update)
 310   (define-key news-mode-map "A" 'news-add-news-group)
 311   (define-key news-mode-map "u" 'news-unsubscribe-current-group)
 312   (define-key news-mode-map "U" 'news-unsubscribe-group)
 313   (define-key news-mode-map "\C-c\C-r" 'news-caesar-buffer-body))
 314
 315 (defun news-mode ()
 316   "News Mode is used by M-x rnews for reading USENET Newsgroups articles.
 317 New readers can find additional help in newsgroup: news.announce.newusers .
 318 All normal editing commands are turned off.
 319 Instead, these commands are available:
 320
 321 .       move point to front of this news article (same as Meta-<).
 322 Space   scroll to next screen of this news article.
 323 Delete  scroll down previous page of this news article.
 324 n       move to next news article, possibly next group.
 325 p       move to previous news article, possibly previous group.
 326 j       jump to news article specified by numeric position.
 327 M-j     jump to news group.
 328 M-n     goto next news group.
 329 M-p     goto previous news group.
 330 l       list all the news groups with current status.
 331 ?       print this help message.
 332 C-c C-r caesar rotate all letters by 13 places in the article's body (rot13).
 333 g       get new USENET news.
 334 f       post a reply article to USENET.
 335 a       post an original news article.
 336 A       add a newsgroup.
 337 o       save the current article in the named file (append if file exists).
 338 C-o     output this message to a Unix-format mail file (append it).
 339 c       \"copy\" (actually link) current or prefix-arg msg to file.
 340         warning: target directory and message file must be on same device
 341                 (UNIX magic)
 342 t       show all the headers this news article originally had.
 343 q       quit reading news after updating .newsrc file.
 344 e       exit updating .newsrc file.
 345 m       mail a news article.  Same as C-x 4 m.
 346 x       update last message seen to be the current message.
 347 r       mail a reply to this news article.  Like m but initializes some fields.
 348 u       unsubscribe from current newsgroup.
 349 U       unsubscribe from specified newsgroup."
 350   (interactive)
 351   (kill-all-local-variables)
 352   (make-local-variable 'news-read-first-time-p)
 353   (setq news-read-first-time-p t)
 354   (make-local-variable 'news-current-news-group)
 355 ;  (setq news-current-news-group "??")
 356   (make-local-variable 'news-current-group-begin)
 357   (setq news-current-group-begin 0)
 358   (make-local-variable 'news-current-message-number)
 359   (setq news-current-message-number 0)
 360   (make-local-variable 'news-total-current-group)
 361   (make-local-variable 'news-buffer-save)
 362   (make-local-variable 'version-control)
 363   (setq version-control 'never)
 364   (make-local-variable 'news-point-pdl)
 365 ;  This breaks it.  I don't have time to figure out why. -- RMS
 366 ;  (make-local-variable 'news-group-article-assoc)
 367   (setq major-mode 'news-mode)
 368   (setq mode-line-process '(news-minor-modes))
 369   (setq mode-name "NEWS")
 370   (news-set-mode-line)
 371   (set-syntax-table text-mode-syntax-table)
 372   (use-local-map news-mode-map)
 373   (setq local-abbrev-table text-mode-abbrev-table)
 374   (run-mode-hooks 'news-mode-hook))
 375
 376 (defun string-subst-char (new old string)
 377   (let (index)
 378     (setq old (regexp-quote (char-to-string old))
 379           string (substring string 0))
 380     (while (setq index (string-match old string))
 381       (aset string index new)))
 382   string)
 383
 384 ;; update read message number
 385 (defmacro news-update-message-read (ngroup nno)
 386   (list 'setcar
 387         (list 'news-cdadr
 388               (list 'assoc ngroup 'news-group-article-assoc))
 389         nno))
 390
 391 (defun news-parse-range (number-string)
 392   "Parse string representing range of numbers of he form <a>-<b>
 393 to a list (a . b)"
 394   (let ((n (string-match "-" number-string)))
 395     (if n
 396         (cons (string-to-number (substring number-string 0 n))
 397               (string-to-number (substring number-string (1+ n))))
 398       (setq n (string-to-number number-string))
 399       (cons n n))))
 400
 401 ;(defun is-in (elt lis)
 402 ;  (catch 'foo
 403 ;    (while lis
 404 ;      (if (equal (car lis) elt)
 405 ;         (throw 'foo t)
 406 ;       (setq lis (cdr lis))))))
 407
 408 (defun news-get-new-news ()
 409   "Get new USENET news, if there is any for the current user."
 410   (interactive)
 411   (if (not (null news-user-group-list))
 412       (news-update-newsrc-file))
 413   (setq news-group-article-assoc ())
 414   (setq news-user-group-list ())
 415   (message "Looking up %s file..." news-startup-file)
 416   (let ((file (substitute-in-file-name news-startup-file))
 417         (temp-user-groups ()))
 418     (save-excursion
 419       (let ((newsrcbuf (find-file-noselect file))
 420             start end endofline tem)
 421         (set-buffer newsrcbuf)
 422         (goto-char 0)
 423         (while (search-forward ": " nil t)
 424           (setq end (point))
 425           (beginning-of-line)
 426           (setq start (point))
 427           (end-of-line)
 428           (setq endofline (point))
 429           (setq tem (buffer-substring start (- end 2)))
 430           (let ((range (news-parse-range
 431                         (buffer-substring end endofline))))
 432             (if (assoc tem news-group-article-assoc)
 433                 (message "You are subscribed twice to %s; I ignore second"
 434                          tem)
 435               (setq temp-user-groups (cons tem temp-user-groups)
 436                     news-group-article-assoc
 437                     (cons (list tem (list (car range)
 438                                           (cdr range)
 439                                           (cdr range)))
 440                           news-group-article-assoc)))))
 441         (kill-buffer newsrcbuf)))
 442     (setq temp-user-groups (nreverse temp-user-groups))
 443     (message "Prefrobnicating...")
 444     (switch-to-buffer news-buffer)
 445     (setq news-user-group-list temp-user-groups)
 446     (while (and temp-user-groups
 447                 (not (news-read-files-into-buffer
 448                       (car temp-user-groups) nil)))
 449       (setq temp-user-groups (cdr temp-user-groups)))
 450     (if (null temp-user-groups)
 451         (message "No news is good news.")
 452       (message ""))))
 453
 454 (defun news-list-news-groups ()
 455   "Display all the news groups to which you belong."
 456   (interactive)
 457   (with-output-to-temp-buffer "*Newsgroups*"
 458     (save-excursion
 459       (set-buffer standard-output)
 460       (insert
 461         "News Group        Msg No.       News Group        Msg No.\n")
 462       (insert
 463         "-------------------------       -------------------------\n")
 464       (let ((temp news-user-group-list)
 465             (flag nil))
 466         (while temp
 467           (let ((item (assoc (car temp) news-group-article-assoc)))
 468             (insert (car item))
 469             (indent-to (if flag 52 20))
 470             (insert (int-to-string (news-cadr (news-cadr item))))
 471             (if flag
 472                 (insert "\n")
 473               (indent-to 33))
 474             (setq temp (cdr temp) flag (not flag))))))))
 475
 476 ;; Mode line hack
 477 (defun news-set-mode-line ()
 478   "Set mode line string to something useful."
 479   (setq mode-line-process
 480         (concat " "
 481                 (if (integerp news-current-message-number)
 482                     (int-to-string news-current-message-number)
 483                  "??")
 484                 "/"
 485                 (if (integerp news-current-group-end)
 486                     (int-to-string news-current-group-end)
 487                   news-current-group-end)))
 488   (setq mode-line-buffer-identification
 489         (concat "NEWS: "
 490                 news-current-news-group
 491                 ;; Enough spaces to pad group name to 17 positions.
 492                 (substring "                 "
 493                            0 (max 0 (- 17 (length news-current-news-group))))))
 494   (set-buffer-modified-p t)
 495   (sit-for 0))
 496
 497 (defun news-goto-news-group (gp)
 498   "Takes a string and goes to that news group."
 499   (interactive (list (completing-read "NewsGroup: "
 500                                       news-group-article-assoc)))
 501   (message "Jumping to news group %s..." gp)
 502   (news-select-news-group gp)
 503   (message "Jumping to news group %s... done." gp))
 504
 505 (defun news-select-news-group (gp)
 506   (let ((grp (assoc gp news-group-article-assoc)))
 507     (if (null grp)
 508         (error "Group %s not subscribed to" gp)
 509       (progn
 510         (news-update-message-read news-current-news-group
 511                                   (news-cdar news-point-pdl))
 512         (news-read-files-into-buffer  (car grp) nil)
 513         (news-set-mode-line)))))
 514
 515 (defun news-goto-message (arg)
 516   "Goes to the article ARG in current newsgroup."
 517   (interactive "p")
 518   (if (null current-prefix-arg)
 519       (setq arg (read-no-blanks-input "Go to article: " "")))
 520   (news-select-message arg))
 521
 522 (defun news-select-message (arg)
 523   (if (stringp arg) (setq arg (string-to-number arg)))
 524   (let ((file (concat news-path
 525                       (string-subst-char ?/ ?. news-current-news-group)
 526                       "/" arg)))
 527     (if (= arg
 528            (or (news-cadr (memq (news-cdar news-point-pdl) news-list-of-files))
 529                0))
 530         (setcdr (car news-point-pdl) arg))
 531     (setq news-current-message-number arg)
 532     (if (file-exists-p file)
 533         (let ((buffer-read-only nil))
 534           (news-read-in-file file)
 535           (news-set-mode-line))
 536       (news-set-mode-line)
 537       (error "Article %d nonexistent" arg))))
 538
 539 (defun news-force-update ()
 540   "updates the position of last article read in the current news group"
 541   (interactive)
 542   (setcdr (car news-point-pdl) news-current-message-number)
 543   (message "Updated to %d" news-current-message-number))
 544
 545 (defun news-next-message (arg)
 546   "Move ARG messages forward within one newsgroup.
 547 Negative ARG moves backward.
 548 If ARG is 1 or -1, moves to next or previous newsgroup if at end."
 549   (interactive "p")
 550   (let ((no (+ arg news-current-message-number)))
 551     (if (or (< no news-current-group-begin)
 552             (> no news-current-group-end))
 553         (cond ((= arg 1)
 554                (news-set-current-group-certification)
 555                (news-next-group))
 556               ((= arg -1)
 557                (news-previous-group))
 558               (t (error "Article out of range")))
 559       (let ((plist (news-get-motion-lists
 560                      news-current-message-number
 561                      news-list-of-files)))
 562         (if (< arg 0)
 563             (news-select-message (nth (1- (- arg)) (car (cdr plist))))
 564           (news-select-message (nth (1- arg) (car plist))))))))
 565
 566 (defun news-previous-message (arg)
 567   "Move ARG messages backward in current newsgroup.
 568 With no arg or arg of 1, move one message
 569 and move to previous newsgroup if at beginning.
 570 A negative ARG means move forward."
 571   (interactive "p")
 572   (news-next-message (- arg)))
 573
 574 (defun news-move-to-group (arg)
 575   "Given arg move forward or backward to a new newsgroup."
 576   (let ((cg news-current-news-group))
 577     (let ((plist (news-get-motion-lists cg news-user-group-list))
 578           ngrp)
 579       (if (< arg 0)
 580           (or (setq ngrp (nth (1- (- arg)) (news-cadr plist)))
 581               (error "No previous news groups"))
 582         (or (setq ngrp (nth arg (car plist)))
 583             (error "No more news groups")))
 584       (news-select-news-group ngrp))))
 585
 586 (defun news-next-group ()
 587   "Moves to the next user group."
 588   (interactive)
 589 ;  (message "Moving to next group...")
 590   (news-move-to-group 0)
 591   (while (null news-list-of-files)
 592     (news-move-to-group 0)))
 593 ;  (message "Moving to next group... done.")
 594
 595 (defun news-previous-group ()
 596   "Moves to the previous user group."
 597   (interactive)
 598 ;  (message "Moving to previous group...")
 599   (news-move-to-group -1)
 600   (while (null news-list-of-files)
 601     (news-move-to-group -1)))
 602 ;  (message "Moving to previous group... done.")
 603
 604 (defun news-get-motion-lists (arg listy)
 605   "Given a msgnumber/group this will return a list of two lists;
 606 one for moving forward and one for moving backward."
 607   (let ((temp listy)
 608         (result ()))
 609     (catch 'out
 610       (while temp
 611         (if (equal (car temp) arg)
 612             (throw 'out (cons (cdr temp) (list result)))
 613           (setq result (nconc (list (car temp)) result))
 614           (setq temp (cdr temp)))))))
 615
 616 ;; miscellaneous io routines
 617 (defun news-read-in-file (filename)
 618   (erase-buffer)
 619   (let ((start (point)))
 620   (insert-file-contents filename)
 621   (news-convert-format)
 622   ;; Run each hook that applies to the current newsgroup.
 623   (let ((hooks news-group-hook-alist))
 624     (while hooks
 625       (goto-char start)
 626       (if (string-match (car (car hooks)) news-group-name)
 627           (funcall (cdr (car hooks))))
 628       (setq hooks (cdr hooks))))
 629   (goto-char start)
 630   (forward-line 1)
 631   (if (eobp)
 632       (message "(Empty file?)")
 633     (goto-char start))))
 634
 635 (defun news-convert-format ()
 636   (save-excursion
 637     (save-restriction
 638       (let* ((start (point))
 639              (end (condition-case ()
 640                       (progn (search-forward "\n\n") (point))
 641                     (error nil)))
 642              has-from has-date)
 643        (cond (end
 644               (narrow-to-region start end)
 645               (goto-char start)
 646               (setq has-from (search-forward "\nFrom:" nil t))
 647               (cond ((and (not has-from) has-date)
 648                      (goto-char start)
 649                      (search-forward "\nDate:")
 650                      (beginning-of-line)
 651                      (kill-line) (kill-line)))
 652               (news-delete-headers start)
 653               (goto-char start)))))))
 654
 655 (defun news-show-all-headers ()
 656   "Redisplay current news item with all original headers"
 657   (interactive)
 658   (let (news-ignored-headers
 659         (buffer-read-only ()))
 660     (erase-buffer)
 661     (news-set-mode-line)
 662     (news-read-in-file
 663      (concat news-path
 664              (string-subst-char ?/ ?. news-current-news-group)
 665              "/" (int-to-string news-current-message-number)))))
 666
 667 (defun news-delete-headers (pos)
 668   (goto-char pos)
 669   (and (stringp news-ignored-headers)
 670        (while (re-search-forward news-ignored-headers nil t)
 671          (beginning-of-line)
 672          (delete-region (point)
 673                         (progn (re-search-forward "\n[^ \t]")
 674                                (forward-char -1)
 675                                (point))))))
 676
 677 (defun news-exit ()
 678   "Quit news reading session and update the .newsrc file."
 679   (interactive)
 680   (if (y-or-n-p "Do you really wanna quit reading news ? ")
 681       (progn (message "Updating %s..." news-startup-file)
 682              (news-update-newsrc-file)
 683              (news-write-certifications)
 684              (message "Updating %s... done" news-startup-file)
 685              (message "Now do some real work")
 686              (quit-window)
 687              (switch-to-buffer news-buffer-save)
 688              (setq news-user-group-list ()))
 689     (message "")))
 690
 691 (defun news-update-newsrc-file ()
 692   "Updates the .newsrc file in the users home dir."
 693   (let ((newsrcbuf (find-file-noselect
 694                      (substitute-in-file-name news-startup-file)))
 695         (tem news-user-group-list)
 696         group)
 697     (save-excursion
 698       (if (not (null news-current-news-group))
 699           (news-update-message-read news-current-news-group
 700                                     (news-cdar news-point-pdl)))
 701       (set-buffer newsrcbuf)
 702       (while tem
 703         (setq group (assoc (car tem) news-group-article-assoc))
 704         (if (= (news-cadr (news-cadr group)) (news-caddr (news-cadr group)))
 705             nil
 706           (goto-char 0)
 707           (if (search-forward (concat (car group) ": ") nil t)
 708               (kill-line nil)
 709             (insert (car group) ": \n") (backward-char 1))
 710           (insert (int-to-string (car (news-cadr group))) "-"
 711                   (int-to-string (news-cadr (news-cadr group)))))
 712         (setq tem (cdr tem)))
 713      (while news-unsubscribe-groups
 714        (setq group (assoc (car news-unsubscribe-groups)
 715                           news-group-article-assoc))
 716        (goto-char 0)
 717        (if (search-forward (concat (car group) ": ") nil t)
 718            (progn
 719               (backward-char 2)
 720               (kill-line nil)
 721               (insert "! " (int-to-string (car (news-cadr group)))
 722                       "-" (int-to-string (news-cadr (news-cadr group))))))
 723        (setq news-unsubscribe-groups (cdr news-unsubscribe-groups)))
 724      (save-buffer)
 725      (kill-buffer (current-buffer)))))
 726
 727
 728 (defun news-unsubscribe-group (group)
 729   "Removes you from newgroup GROUP."
 730   (interactive (list (completing-read  "Unsubscribe from group: "
 731                                       news-group-article-assoc)))
 732   (news-unsubscribe-internal group))
 733
 734 (defun news-unsubscribe-current-group ()
 735   "Removes you from the newsgroup you are now reading."
 736   (interactive)
 737   (if (y-or-n-p "Do you really want to unsubscribe from this group ? ")
 738       (news-unsubscribe-internal news-current-news-group)))
 739
 740 (defun news-unsubscribe-internal (group)
 741   (let ((tem (assoc group news-group-article-assoc)))
 742     (if tem
 743         (progn
 744           (setq news-unsubscribe-groups (cons group news-unsubscribe-groups))
 745           (news-update-message-read group (news-cdar news-point-pdl))
 746           (if (equal group news-current-news-group)
 747               (news-next-group))
 748           (message ""))
 749       (error "Not subscribed to group: %s" group))))
 750
 751 (defun news-save-item-in-file (file)
 752   "Save the current article that is being read by appending to a file."
 753   (interactive "FSave item in file: ")
 754   (append-to-file (point-min) (point-max) file))
 755
 756 (defun news-get-pruned-list-of-files (gp-list end-file-no)
 757   "Given a news group it finds all files in the news group.
 758 The arg must be in slashified format.
 759 Using ls was found to be too slow in a previous version."
 760   (let
 761       ((answer
 762         (and
 763          (not (and end-file-no
 764                    (equal (news-set-current-certifiable)
 765                      (news-group-certification gp-list))
 766                    (setq news-list-of-files nil
 767                          news-list-of-files-possibly-bogus t)))
 768          (let* ((file-directory (concat news-path
 769                                         (string-subst-char ?/ ?. gp-list)))
 770                 tem
 771                 (last-winner
 772                  (and end-file-no
 773                       (news-wins file-directory end-file-no)
 774                       (news-find-first-or-last file-directory end-file-no 1))))
 775            (setq news-list-of-files-possibly-bogus t news-list-of-files nil)
 776            (if last-winner
 777                (progn
 778                  (setq news-list-of-files-possibly-bogus t
 779                        news-current-group-end last-winner)
 780                  (while (> last-winner end-file-no)
 781                    (news-push last-winner news-list-of-files)
 782                    (setq last-winner (1- last-winner)))
 783                  news-list-of-files)
 784              (if (or (not (file-directory-p file-directory))
 785                      (not (file-readable-p file-directory)))
 786                  nil
 787                (setq news-list-of-files
 788                      (condition-case error
 789                          (directory-files file-directory)
 790                        (file-error
 791                         (if (string= (nth 2 error) "permission denied")
 792                             (message "Newsgroup %s is read-protected"
 793                                      gp-list)
 794                           (signal 'file-error (cdr error)))
 795                         nil)))
 796                (setq tem news-list-of-files)
 797                (while tem
 798                  (if (or (not (string-match "^[0-9]*$" (car tem)))
 799                          ;; don't get confused by directories that look like numbers
 800                          (file-directory-p
 801                           (concat file-directory "/" (car tem)))
 802                          (<= (string-to-number (car tem)) end-file-no))
 803                      (setq news-list-of-files
 804                            (delq (car tem) news-list-of-files)))
 805                  (setq tem (cdr tem)))
 806                (if (null news-list-of-files)
 807                    (progn (setq news-current-group-end 0)
 808                           nil)
 809                  (setq news-list-of-files
 810                        (mapcar 'string-to-number news-list-of-files))
 811                  (setq news-list-of-files (sort news-list-of-files '<))
 812                  (setq news-current-group-end
 813                        (elt news-list-of-files
 814                             (1- (length news-list-of-files))))
 815                  news-list-of-files)))))))
 816     (or answer (progn (news-set-current-group-certification) nil))))
 817
 818 (defun news-read-files-into-buffer (group reversep)
 819   (let* ((files-start-end (news-cadr (assoc group news-group-article-assoc)))
 820          (start-file-no (car files-start-end))
 821          (end-file-no (news-cadr files-start-end))
 822          (buffer-read-only nil))
 823     (setq news-current-news-group group)
 824     (setq news-current-message-number nil)
 825     (setq news-current-group-end nil)
 826     (news-set-mode-line)
 827     (news-get-pruned-list-of-files group end-file-no)
 828     (news-set-mode-line)
 829     ;; @@ should be a lot smarter than this if we have to move
 830     ;; @@ around correctly.
 831     (setq news-point-pdl (list (cons (car files-start-end)
 832                                      (news-cadr files-start-end))))
 833     (if (null news-list-of-files)
 834         (progn (erase-buffer)
 835                (setq news-current-group-end end-file-no)
 836                (setq news-current-group-begin end-file-no)
 837                (setq news-current-message-number end-file-no)
 838                (news-set-mode-line)
 839 ;              (message "No new articles in " group " group.")
 840                nil)
 841       (setq news-current-group-begin (car news-list-of-files))
 842       (if reversep
 843           (setq news-current-message-number news-current-group-end)
 844         (if (> (car news-list-of-files) end-file-no)
 845             (setcdr (car news-point-pdl) (car news-list-of-files)))
 846         (setq news-current-message-number news-current-group-begin))
 847       (news-set-message-counters)
 848       (news-set-mode-line)
 849       (news-read-in-file (concat news-path
 850                                  (string-subst-char ?/ ?. group)
 851                                  "/"
 852                                  (int-to-string
 853                                    news-current-message-number)))
 854       (news-set-message-counters)
 855       (news-set-mode-line)
 856       t)))
 857
 858 (defun news-add-news-group (gp)
 859   "Resubscribe to or add a USENET news group named GROUP (a string)."
 860 ; @@ (completing-read ...)
 861 ; @@ could be based on news library file ../active (slightly fascist)
 862 ; @@ or (expensive to compute) all directories under the news spool directory
 863   (interactive "sAdd news group: ")
 864   (let ((file-dir (concat news-path (string-subst-char ?/ ?. gp))))
 865     (save-excursion
 866       (if (null (assoc gp news-group-article-assoc))
 867           (let ((newsrcbuf (find-file-noselect
 868                             (substitute-in-file-name news-startup-file))))
 869             (if (file-directory-p file-dir)
 870                 (progn
 871                   (switch-to-buffer newsrcbuf)
 872                   (goto-char 0)
 873                   (if (search-forward (concat gp "! ") nil t)
 874                       (progn
 875                         (message "Re-subscribing to group %s." gp)
 876                         ;;@@ news-unsubscribe-groups isn't being used
 877                         ;;(setq news-unsubscribe-groups
 878                         ;;    (delq gp news-unsubscribe-groups))
 879                         (backward-char 2)
 880                         (delete-char 1)
 881                         (insert ":"))
 882                     (progn
 883                       (message
 884                        "Added %s to your list of newsgroups." gp)
 885                       (goto-char (point-max))
 886                       (insert gp ": 1-1\n")))
 887                   (search-backward gp nil t)
 888                   (let (start end endofline tem)
 889                     (search-forward ": " nil t)
 890                     (setq end (point))
 891                     (beginning-of-line)
 892                     (setq start (point))
 893                     (end-of-line)
 894                     (setq endofline (point))
 895                     (setq tem (buffer-substring start (- end 2)))
 896                     (let ((range (news-parse-range
 897                                   (buffer-substring end endofline))))
 898                       (setq news-group-article-assoc
 899                             (cons (list tem (list (car range)
 900                                                   (cdr range)
 901                                                   (cdr range)))
 902                                   news-group-article-assoc))))
 903                   (save-buffer)
 904                   (kill-buffer (current-buffer)))
 905               (message "Newsgroup %s doesn't exist." gp)))
 906         (message "Already subscribed to group %s." gp)))))
 907
 908 (defun news-make-link-to-message (number newname)
 909         "Forges a link to an rnews message numbered number (current if no arg)
 910 Good for hanging on to a message that might or might not be
 911 automatically deleted."
 912   (interactive "P
 913 FName to link to message: ")
 914   (add-name-to-file
 915    (concat news-path
 916            (string-subst-char ?/ ?. news-current-news-group)
 917            "/" (if number
 918                    (prefix-numeric-value number)
 919                  news-current-message-number))
 920    newname))
 921
 922 ;;; caesar-region written by phr@gnu.org  Nov 86
 923 ;;; modified by tower@gnu.org Nov 86
 924 (defun caesar-region (&optional n)
 925   "Caesar rotation of region by N, default 13, for decrypting netnews."
 926   (interactive (if current-prefix-arg   ; Was there a prefix arg?
 927                    (list (prefix-numeric-value current-prefix-arg))
 928                  (list nil)))
 929   (cond ((not (numberp n)) (setq n 13))
 930         (t (setq n (mod n 26))))        ;canonicalize N
 931   (if (not (zerop n))           ; no action needed for a rot of 0
 932       (progn
 933         (if (or (not (boundp 'caesar-translate-table))
 934                 (/= (aref caesar-translate-table ?a) (+ ?a n)))
 935             (let ((i 0) (lower "abcdefghijklmnopqrstuvwxyz") upper)
 936               (message "Building caesar-translate-table...")
 937               (setq caesar-translate-table (make-vector 256 0))
 938               (while (< i 256)
 939                 (aset caesar-translate-table i i)
 940                 (setq i (1+ i)))
 941               (setq lower (concat lower lower) upper (upcase lower) i 0)
 942               (while (< i 26)
 943                 (aset caesar-translate-table (+ ?a i) (aref lower (+ i n)))
 944                 (aset caesar-translate-table (+ ?A i) (aref upper (+ i n)))
 945                 (setq i (1+ i)))
 946               (message "Building caesar-translate-table... done")))
 947         (let ((from (region-beginning))
 948               (to (region-end))
 949               (i 0) str len)
 950           (setq str (buffer-substring from to))
 951           (setq len (length str))
 952           (while (< i len)
 953             (aset str i (aref caesar-translate-table (aref str i)))
 954             (setq i (1+ i)))
 955           (goto-char from)
 956           (kill-region from to)
 957           (insert str)))))
 958
 959 ;;; news-caesar-buffer-body written by paul@media-lab.mit.edu  Wed Oct 1, 1986
 960 ;;; hacked further by tower@gnu.org
 961 (defun news-caesar-buffer-body (&optional rotnum)
 962   "Caesar rotates all letters in the current buffer by 13 places.
 963 Used to encode/decode possibly offensive messages (commonly in net.jokes).
 964 With prefix arg, specifies the number of places to rotate each letter forward.
 965 Mail and USENET news headers are not rotated."
 966   (interactive (if current-prefix-arg   ; Was there a prefix arg?
 967                    (list (prefix-numeric-value current-prefix-arg))
 968                  (list nil)))
 969   (save-excursion
 970     (let ((buffer-status buffer-read-only))
 971       (setq buffer-read-only nil)
 972       ;; setup the region
 973       (set-mark (if (equal major-mode 'news-mode)
 974                     (progn (goto-char (point-min))
 975                            (search-forward "\n\n" nil t))
 976                   (mail-text-start)))
 977       (goto-char (point-max))
 978       (caesar-region rotnum)
 979       (setq buffer-read-only buffer-status))))
 980
 981 (provide 'rnews)
 982
 983 ;; arch-tag: c032a20b-cafb-466c-b3fa-5be404a18f8c
 984 ;;; rnews.el ends here