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, 2009, 2010, 2011, 2012 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 of the License, or
  14 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; This file has been obsolete since Emacs 21.1.
  27
  28 ;;; Change Log:
  29
  30 ;; Created Sun Mar 10,1985 at 21:35:01 ads and sundar@hernes.ai.mit.edu
  31 ;; Should do the point pdl stuff sometime
  32 ;; finito except pdl.... Sat Mar 16,1985 at 06:43:44
  33 ;; lets keep the summary stuff out until we get it working ..
  34 ;;      sundar@hermes.ai.mit.edu Wed Apr 10,1985 at 16:32:06
  35 ;; hack slash maim. mly@gnu.org Thu 18 Apr, 1985 06:11:14
  36 ;; modified to correct reentrance bug, to not bother with groups that
  37 ;;   received no new traffic since last read completely, to find out
  38 ;;   what traffic a group has available much more quickly when
  39 ;;   possible, to do some completing reads for group names - should
  40 ;;   be much faster...
  41 ;;      KING@KESTREL.arpa, Thu Mar 13 09:03:28 1986
  42 ;; made news-{next,previous}-group skip groups with no new messages; and
  43 ;; added checking for unsubscribed groups to news-add-news-group
  44 ;;      tower@gnu.org Jul 18 1986
  45 ;; bound rmail-output to C-o; and changed header-field commands binding to
  46 ;; agree with the new C-c C-f usage in sendmail
  47 ;;      tower@gnu.org Sep  3 1986
  48 ;; added news-rotate-buffer-body
  49 ;;      tower@gnu.org Oct 17 1986
  50 ;; made messages more user friendly, cleaned up news-inews
  51 ;; move posting and mail code to new file rnewpost.el
  52 ;;      tower@gnu.org Oct 29 1986
  53 ;; added caesar-region, rename news-caesar-buffer-body, hacked accordingly
  54 ;;      tower@gnu.org Nov 21 1986
  55 ;; added tower@gnu.org 22 Apr 87
  56
  57 ;;; Code:
  58
  59 (require 'mail-utils)
  60 (require 'sendmail)
  61
  62 (defvar caesar-translate-table)
  63 (defvar minor-modes)
  64 (defvar news-buffer-save)
  65 (defvar news-group-name)
  66 (defvar news-minor-modes)
  67
  68 (autoload 'rmail-output "rmailout"
  69   "Append this message to Unix mail file named FILE-NAME."
  70   t)
  71
  72 (autoload 'news-reply "rnewspost"
  73   "Compose and post a reply to the current article on USENET.
  74 While composing the reply, use \\[mail-yank-original] to yank the original
  75 message into it."
  76   t)
  77
  78 (autoload 'news-mail-other-window "rnewspost"
  79   "Send mail in another window.
  80 While composing the message, use \\[mail-yank-original] to yank the
  81 original message into it."
  82   t)
  83
  84 (autoload 'news-post-news "rnewspost"
  85   "Begin editing a new USENET news article to be posted."
  86   t)
  87
  88 (autoload 'news-mail-reply "rnewspost"
  89   "Mail a reply to the author of the current article.
  90 While composing the reply, use \\[mail-yank-original] to yank the original
  91 message into it."
  92   t)
  93
  94 (defvar news-group-hook-alist nil
  95   "Alist of (GROUP-REGEXP . HOOK) pairs.
  96 Just before displaying a message, each HOOK is called
  97 if its GROUP-REGEXP matches the current newsgroup name.")
  98
  99 (defvar rmail-last-file (expand-file-name "~/mbox.news"))
 100
 101 ;Now in paths.el.
 102 ;(defvar news-path "/usr/spool/news/"
 103 ;  "The root directory below which all news files are stored.")
 104
 105 (defvar news-startup-file "$HOME/.newsrc" "Contains ~/.newsrc")
 106 (defvar news-certification-file "$HOME/.news-dates" "Contains ~/.news-dates")
 107
 108 ;; random headers that we decide to ignore.
 109 (defvar news-ignored-headers
 110   "^Path:\\|^Posting-Version:\\|^Article-I.D.:\\|^Expires:\\|^Date-Received:\\|^References:\\|^Control:\\|^Xref:\\|^Lines:\\|^Posted:\\|^Relay-Version:\\|^Message-ID:\\|^Nf-ID:\\|^Nf-From:\\|^Approved:\\|^Sender:"
 111   "All random fields within the header of a message.")
 112
 113 (defvar news-mode-map nil)
 114 (defvar news-read-first-time-p t)
 115 ;; Contains the (dotified) news groups of which you are a member.
 116 (defvar news-user-group-list nil)
 117
 118 (defvar news-current-news-group nil)
 119 (defvar news-current-group-begin nil)
 120 (defvar news-current-group-end  nil)
 121 (defvar news-current-certifications nil
 122         "An assoc list of a group name and the time at which it is
 123 known that the group had no new traffic")
 124 (defvar news-current-certifiable nil
 125         "The time when the directory we are now working on was written")
 126
 127 (defvar news-message-filter nil
 128   "User specifiable filter function that will be called during
 129 formatting of the news file")
 130
 131 ;(defvar news-mode-group-string "Starting-Up"
 132 ;  "Mode line group name info is held in this variable")
 133 (defvar news-list-of-files nil
 134   "Global variable in which we store the list of files
 135 associated with the current newsgroup")
 136 (defvar news-list-of-files-possibly-bogus nil
 137   "variable indicating we only are guessing at which files are available.
 138 Not currently used.")
 139
 140 ;; association list in which we store lists of the form
 141 ;; (pointified-group-name (first last old-last))
 142 (defvar news-group-article-assoc nil)
 143
 144 (defvar news-current-message-number 0 "Displayed Article Number")
 145 (defvar news-total-current-group 0 "Total no of messages in group")
 146
 147 (defvar news-unsubscribe-groups ())
 148 (defvar news-point-pdl () "List of visited news messages.")
 149 (defvar news-no-jumps-p t)
 150 (defvar news-buffer () "Buffer into which news files are read.")
 151
 152 (defmacro news-push (item ref)
 153   (list 'setq ref (list 'cons item ref)))
 154
 155 (defmacro news-cadr (x) (list 'car (list 'cdr x)))
 156 (defmacro news-cdar (x) (list 'cdr (list 'car x)))
 157 (defmacro news-caddr (x) (list 'car (list 'cdr (list 'cdr x))))
 158 (defmacro news-cadar (x) (list 'car (list 'cdr (list 'car x))))
 159 (defmacro news-caadr (x) (list 'car (list 'car (list 'cdr x))))
 160 (defmacro news-cdadr (x) (list 'cdr (list 'car (list 'cdr x))))
 161
 162 (defmacro news-wins (pfx index)
 163   `(file-exists-p (concat ,pfx "/" (int-to-string ,index))))
 164
 165 (defvar news-max-plausible-gap 2
 166         "* In an rnews directory, the maximum possible gap size.
 167 A gap is a sequence of missing messages between two messages that exist.
 168 An empty file does not contribute to a gap -- it ends one.")
 169
 170 (defun news-find-first-and-last (prefix base)
 171   (and (news-wins prefix base)
 172        (cons (news-find-first-or-last prefix base -1)
 173              (news-find-first-or-last prefix base 1))))
 174
 175 (defmacro news-/ (a1 a2)
 176 ;; a form of / that guarantees that (/ -1 2) = 0
 177   (if (zerop (/ -1 2))
 178       `(/ ,a1 ,a2)
 179     `(if (< ,a1 0)
 180          (- (/ (- ,a1) ,a2))
 181        (/ ,a1 ,a2))))
 182
 183 (defun news-find-first-or-last (pfx base dirn)
 184   ;; first use powers of two to find a plausible ceiling
 185   (let ((original-dir dirn))
 186     (while (news-wins pfx (+ base dirn))
 187       (setq dirn (* dirn 2)))
 188     (setq dirn (news-/ dirn 2))
 189     ;; Then use a binary search to find the high water mark
 190     (let ((offset (news-/ dirn 2)))
 191       (while (/= offset 0)
 192         (if (news-wins pfx (+ base dirn offset))
 193             (setq dirn (+ dirn offset)))
 194         (setq offset (news-/ offset 2))))
 195     ;; If this high-water mark is bogus, recurse.
 196     (let ((offset (* news-max-plausible-gap original-dir)))
 197       (while (and (/= offset 0) (not (news-wins pfx (+ base dirn offset))))
 198         (setq offset (- offset original-dir)))
 199       (if (= offset 0)
 200           (+ base dirn)
 201         (news-find-first-or-last pfx (+ base dirn offset) original-dir)))))
 202
 203 (defun rnews ()
 204 "Read USENET news for groups for which you are a member and add or
 205 delete groups.
 206 You can reply to articles posted and send articles to any group.
 207
 208 Type \\[describe-mode] once reading news to get a list of rnews commands."
 209   (interactive)
 210   (let ((last-buffer (buffer-name)))
 211     (make-local-variable 'rmail-last-file)
 212     (switch-to-buffer (setq news-buffer (get-buffer-create "*news*")))
 213     (news-mode)
 214     (setq news-buffer-save last-buffer)
 215     (setq buffer-read-only nil)
 216     (erase-buffer)
 217     (setq buffer-read-only t)
 218     (set-buffer-modified-p t)
 219     (sit-for 0)
 220     (message "Getting new USENET news...")
 221     (news-set-mode-line)
 222     (news-get-certifications)
 223     (news-get-new-news)))
 224
 225 (defun news-group-certification (group)
 226   (cdr-safe (assoc group news-current-certifications)))
 227
 228
 229 (defun news-set-current-certifiable ()
 230   ;; Record the date that corresponds to the directory you are about to check
 231   (let ((file (concat news-path
 232                       (string-subst-char ?/ ?. news-current-news-group))))
 233     (setq news-current-certifiable
 234           (nth 5 (file-attributes
 235                   (or (file-symlink-p file) file))))))
 236
 237 (defun news-get-certifications ()
 238   ;; Read the certified-read file from last session
 239   (save-excursion
 240     (save-window-excursion
 241       (setq news-current-certifications
 242             (car-safe
 243              (condition-case var
 244                  (let*
 245                      ((file (substitute-in-file-name news-certification-file))
 246                       (buf (find-file-noselect file)))
 247                    (and (file-exists-p file)
 248                         (progn
 249                           (switch-to-buffer buf 'norecord)
 250                           (unwind-protect
 251                               (read-from-string (buffer-string))
 252                             (kill-buffer buf)))))
 253                (error nil)))))))
 254
 255 (defun news-write-certifications ()
 256   ;; Write a certification file.
 257   ;; This is an assoc list of group names with doubletons that represent
 258   ;; mod times of the directory when group is read completely.
 259   (save-excursion
 260     (save-window-excursion
 261       (with-output-to-temp-buffer
 262           "*CeRtIfIcAtIoNs*"
 263           (print news-current-certifications))
 264       (let ((buf (get-buffer "*CeRtIfIcAtIoNs*")))
 265         (switch-to-buffer buf)
 266         (write-file (substitute-in-file-name news-certification-file))
 267         (kill-buffer buf)))))
 268
 269 (defun news-set-current-group-certification ()
 270   (let ((cgc (assoc news-current-news-group news-current-certifications)))
 271     (if cgc (setcdr cgc news-current-certifiable)
 272       (news-push (cons news-current-news-group news-current-certifiable)
 273                  news-current-certifications))))
 274
 275 (defun news-set-message-counters ()
 276   "Scan through current news-groups filelist to figure out how many messages
 277 are there. Set counters for use with minor mode display."
 278     (if (null news-list-of-files)
 279         (setq news-current-message-number 0)))
 280
 281 (if news-mode-map
 282     nil
 283   (setq news-mode-map (make-keymap))
 284   (suppress-keymap news-mode-map)
 285   (define-key news-mode-map "." 'beginning-of-buffer)
 286   (define-key news-mode-map " " 'scroll-up)
 287   (define-key news-mode-map "\177" 'scroll-down)
 288   (define-key news-mode-map "n" 'news-next-message)
 289   (define-key news-mode-map "c" 'news-make-link-to-message)
 290   (define-key news-mode-map "p" 'news-previous-message)
 291   (define-key news-mode-map "j" 'news-goto-message)
 292   (define-key news-mode-map "q" 'news-exit)
 293   (define-key news-mode-map "e" 'news-exit)
 294   (define-key news-mode-map "\ej" 'news-goto-news-group)
 295   (define-key news-mode-map "\en" 'news-next-group)
 296   (define-key news-mode-map "\ep" 'news-previous-group)
 297   (define-key news-mode-map "l" 'news-list-news-groups)
 298   (define-key news-mode-map "?" 'describe-mode)
 299   (define-key news-mode-map "g" 'news-get-new-news)
 300   (define-key news-mode-map "f" 'news-reply)
 301   (define-key news-mode-map "m" 'news-mail-other-window)
 302   (define-key news-mode-map "a" 'news-post-news)
 303   (define-key news-mode-map "r" 'news-mail-reply)
 304   (define-key news-mode-map "o" 'news-save-item-in-file)
 305   (define-key news-mode-map "\C-o" 'rmail-output)
 306   (define-key news-mode-map "t" 'news-show-all-headers)
 307   (define-key news-mode-map "x" 'news-force-update)
 308   (define-key news-mode-map "A" 'news-add-news-group)
 309   (define-key news-mode-map "u" 'news-unsubscribe-current-group)
 310   (define-key news-mode-map "U" 'news-unsubscribe-group)
 311   (define-key news-mode-map "\C-c\C-r" 'news-caesar-buffer-body))
 312
 313 (defun news-mode ()
 314   "News Mode is used by M-x rnews for reading USENET Newsgroups articles.
 315 New readers can find additional help in newsgroup: news.announce.newusers .
 316 All normal editing commands are turned off.
 317 Instead, these commands are available:
 318
 319 .       move point to front of this news article (same as Meta-<).
 320 Space   scroll to next screen of this news article.
 321 Delete  scroll down previous page of this news article.
 322 n       move to next news article, possibly next group.
 323 p       move to previous news article, possibly previous group.
 324 j       jump to news article specified by numeric position.
 325 M-j     jump to news group.
 326 M-n     goto next news group.
 327 M-p     goto previous news group.
 328 l       list all the news groups with current status.
 329 ?       print this help message.
 330 C-c C-r caesar rotate all letters by 13 places in the article's body (rot13).
 331 g       get new USENET news.
 332 f       post a reply article to USENET.
 333 a       post an original news article.
 334 A       add a newsgroup.
 335 o       save the current article in the named file (append if file exists).
 336 C-o     output this message to a Unix-format mail file (append it).
 337 c       \"copy\" (actually link) current or prefix-arg msg to file.
 338         warning: target directory and message file must be on same device
 339                 (UNIX magic)
 340 t       show all the headers this news article originally had.
 341 q       quit reading news after updating .newsrc file.
 342 e       exit updating .newsrc file.
 343 m       mail a news article.  Same as C-x 4 m.
 344 x       update last message seen to be the current message.
 345 r       mail a reply to this news article.  Like m but initializes some fields.
 346 u       unsubscribe from current newsgroup.
 347 U       unsubscribe from specified newsgroup."
 348   (interactive)
 349   (kill-all-local-variables)
 350   (make-local-variable 'news-read-first-time-p)
 351   (setq news-read-first-time-p t)
 352   (make-local-variable 'news-current-news-group)
 353 ;  (setq news-current-news-group "??")
 354   (make-local-variable 'news-current-group-begin)
 355   (setq news-current-group-begin 0)
 356   (make-local-variable 'news-current-message-number)
 357   (setq news-current-message-number 0)
 358   (make-local-variable 'news-total-current-group)
 359   (make-local-variable 'news-buffer-save)
 360   (make-local-variable 'version-control)
 361   (setq version-control 'never)
 362   (make-local-variable 'news-point-pdl)
 363 ;  This breaks it.  I don't have time to figure out why. -- RMS
 364 ;  (make-local-variable 'news-group-article-assoc)
 365   (setq major-mode 'news-mode)
 366   (setq mode-line-process '(news-minor-modes))
 367   (setq mode-name "NEWS")
 368   (news-set-mode-line)
 369   (set-syntax-table text-mode-syntax-table)
 370   (use-local-map news-mode-map)
 371   (setq local-abbrev-table text-mode-abbrev-table)
 372   (run-mode-hooks 'news-mode-hook))
 373
 374 (defun string-subst-char (new old string)
 375   (let (index)
 376     (setq old (regexp-quote (char-to-string old))
 377           string (substring string 0))
 378     (while (setq index (string-match old string))
 379       (aset string index new)))
 380   string)
 381
 382 ;; update read message number
 383 (defmacro news-update-message-read (ngroup nno)
 384   (list 'setcar
 385         (list 'news-cdadr
 386               (list 'assoc ngroup 'news-group-article-assoc))
 387         nno))
 388
 389 (defun news-parse-range (number-string)
 390   "Parse string representing range of numbers of he form <a>-<b>
 391 to a list (a . b)"
 392   (let ((n (string-match "-" number-string)))
 393     (if n
 394         (cons (string-to-number (substring number-string 0 n))
 395               (string-to-number (substring number-string (1+ n))))
 396       (setq n (string-to-number number-string))
 397       (cons n n))))
 398
 399 ;(defun is-in (elt lis)
 400 ;  (catch 'foo
 401 ;    (while lis
 402 ;      (if (equal (car lis) elt)
 403 ;         (throw 'foo t)
 404 ;       (setq lis (cdr lis))))))
 405
 406 (defun news-get-new-news ()
 407   "Get new USENET news, if there is any for the current user."
 408   (interactive)
 409   (if (not (null news-user-group-list))
 410       (news-update-newsrc-file))
 411   (setq news-group-article-assoc ())
 412   (setq news-user-group-list ())
 413   (message "Looking up %s file..." news-startup-file)
 414   (let ((file (substitute-in-file-name news-startup-file))
 415         (temp-user-groups ()))
 416     (save-excursion
 417       (let ((newsrcbuf (find-file-noselect file))
 418             start end endofline tem)
 419         (set-buffer newsrcbuf)
 420         (goto-char 0)
 421         (while (search-forward ": " nil t)
 422           (setq end (point))
 423           (beginning-of-line)
 424           (setq start (point))
 425           (end-of-line)
 426           (setq endofline (point))
 427           (setq tem (buffer-substring start (- end 2)))
 428           (let ((range (news-parse-range
 429                         (buffer-substring end endofline))))
 430             (if (assoc tem news-group-article-assoc)
 431                 (message "You are subscribed twice to %s; I ignore second"
 432                          tem)
 433               (setq temp-user-groups (cons tem temp-user-groups)
 434                     news-group-article-assoc
 435                     (cons (list tem (list (car range)
 436                                           (cdr range)
 437                                           (cdr range)))
 438                           news-group-article-assoc)))))
 439         (kill-buffer newsrcbuf)))
 440     (setq temp-user-groups (nreverse temp-user-groups))
 441     (message "Prefrobnicating...")
 442     (switch-to-buffer news-buffer)
 443     (setq news-user-group-list temp-user-groups)
 444     (while (and temp-user-groups
 445                 (not (news-read-files-into-buffer
 446                       (car temp-user-groups) nil)))
 447       (setq temp-user-groups (cdr temp-user-groups)))
 448     (if (null temp-user-groups)
 449         (message "No news is good news.")
 450       (message ""))))
 451
 452 (defun news-list-news-groups ()
 453   "Display all the news groups to which you belong."
 454   (interactive)
 455   (with-output-to-temp-buffer "*Newsgroups*"
 456     (with-current-buffer standard-output
 457       (insert
 458         "News Group        Msg No.       News Group        Msg No.\n")
 459       (insert
 460         "-------------------------       -------------------------\n")
 461       (let ((temp news-user-group-list)
 462             (flag nil))
 463         (while temp
 464           (let ((item (assoc (car temp) news-group-article-assoc)))
 465             (insert (car item))
 466             (indent-to (if flag 52 20))
 467             (insert (int-to-string (news-cadr (news-cadr item))))
 468             (if flag
 469                 (insert "\n")
 470               (indent-to 33))
 471             (setq temp (cdr temp) flag (not flag))))))))
 472
 473 ;; Mode line hack
 474 (defun news-set-mode-line ()
 475   "Set mode line string to something useful."
 476   (setq mode-line-process
 477         (concat " "
 478                 (if (integerp news-current-message-number)
 479                     (int-to-string news-current-message-number)
 480                  "??")
 481                 "/"
 482                 (if (integerp news-current-group-end)
 483                     (int-to-string news-current-group-end)
 484                   news-current-group-end)))
 485   (setq mode-line-buffer-identification
 486         (concat "NEWS: "
 487                 news-current-news-group
 488                 ;; Enough spaces to pad group name to 17 positions.
 489                 (substring "                 "
 490                            0 (max 0 (- 17 (length news-current-news-group))))))
 491   (set-buffer-modified-p t)
 492   (sit-for 0))
 493
 494 (defun news-goto-news-group (gp)
 495   "Takes a string and goes to that news group."
 496   (interactive (list (completing-read "NewsGroup: "
 497                                       news-group-article-assoc)))
 498   (message "Jumping to news group %s..." gp)
 499   (news-select-news-group gp)
 500   (message "Jumping to news group %s... done." gp))
 501
 502 (defun news-select-news-group (gp)
 503   (let ((grp (assoc gp news-group-article-assoc)))
 504     (if (null grp)
 505         (error "Group %s not subscribed to" gp)
 506       (progn
 507         (news-update-message-read news-current-news-group
 508                                   (news-cdar news-point-pdl))
 509         (news-read-files-into-buffer  (car grp) nil)
 510         (news-set-mode-line)))))
 511
 512 (defun news-goto-message (arg)
 513   "Goes to the article ARG in current newsgroup."
 514   (interactive "p")
 515   (if (null current-prefix-arg)
 516       (setq arg (read-no-blanks-input "Go to article: " "")))
 517   (news-select-message arg))
 518
 519 (defun news-select-message (arg)
 520   (if (stringp arg) (setq arg (string-to-number arg)))
 521   (let ((file (concat news-path
 522                       (string-subst-char ?/ ?. news-current-news-group)
 523                       "/" arg)))
 524     (if (= arg
 525            (or (news-cadr (memq (news-cdar news-point-pdl) news-list-of-files))
 526                0))
 527         (setcdr (car news-point-pdl) arg))
 528     (setq news-current-message-number arg)
 529     (if (file-exists-p file)
 530         (let ((buffer-read-only nil))
 531           (news-read-in-file file)
 532           (news-set-mode-line))
 533       (news-set-mode-line)
 534       (error "Article %d nonexistent" arg))))
 535
 536 (defun news-force-update ()
 537   "updates the position of last article read in the current news group"
 538   (interactive)
 539   (setcdr (car news-point-pdl) news-current-message-number)
 540   (message "Updated to %d" news-current-message-number))
 541
 542 (defun news-next-message (arg)
 543   "Move ARG messages forward within one newsgroup.
 544 Negative ARG moves backward.
 545 If ARG is 1 or -1, moves to next or previous newsgroup if at end."
 546   (interactive "p")
 547   (let ((no (+ arg news-current-message-number)))
 548     (if (or (< no news-current-group-begin)
 549             (> no news-current-group-end))
 550         (cond ((= arg 1)
 551                (news-set-current-group-certification)
 552                (news-next-group))
 553               ((= arg -1)
 554                (news-previous-group))
 555               (t (error "Article out of range")))
 556       (let ((plist (news-get-motion-lists
 557                      news-current-message-number
 558                      news-list-of-files)))
 559         (if (< arg 0)
 560             (news-select-message (nth (1- (- arg)) (car (cdr plist))))
 561           (news-select-message (nth (1- arg) (car plist))))))))
 562
 563 (defun news-previous-message (arg)
 564   "Move ARG messages backward in current newsgroup.
 565 With no arg or arg of 1, move one message
 566 and move to previous newsgroup if at beginning.
 567 A negative ARG means move forward."
 568   (interactive "p")
 569   (news-next-message (- arg)))
 570
 571 (defun news-move-to-group (arg)
 572   "Given arg move forward or backward to a new newsgroup."
 573   (let ((cg news-current-news-group))
 574     (let ((plist (news-get-motion-lists cg news-user-group-list))
 575           ngrp)
 576       (if (< arg 0)
 577           (or (setq ngrp (nth (1- (- arg)) (news-cadr plist)))
 578               (error "No previous news groups"))
 579         (or (setq ngrp (nth arg (car plist)))
 580             (error "No more news groups")))
 581       (news-select-news-group ngrp))))
 582
 583 (defun news-next-group ()
 584   "Moves to the next user group."
 585   (interactive)
 586 ;  (message "Moving to next group...")
 587   (news-move-to-group 0)
 588   (while (null news-list-of-files)
 589     (news-move-to-group 0)))
 590 ;  (message "Moving to next group... done.")
 591
 592 (defun news-previous-group ()
 593   "Moves to the previous user group."
 594   (interactive)
 595 ;  (message "Moving to previous group...")
 596   (news-move-to-group -1)
 597   (while (null news-list-of-files)
 598     (news-move-to-group -1)))
 599 ;  (message "Moving to previous group... done.")
 600
 601 (defun news-get-motion-lists (arg listy)
 602   "Given a msgnumber/group this will return a list of two lists;
 603 one for moving forward and one for moving backward."
 604   (let ((temp listy)
 605         (result ()))
 606     (catch 'out
 607       (while temp
 608         (if (equal (car temp) arg)
 609             (throw 'out (cons (cdr temp) (list result)))
 610           (setq result (nconc (list (car temp)) result))
 611           (setq temp (cdr temp)))))))
 612
 613 ;; miscellaneous io routines
 614 (defun news-read-in-file (filename)
 615   (erase-buffer)
 616   (let ((start (point)))
 617   (insert-file-contents filename)
 618   (news-convert-format)
 619   ;; Run each hook that applies to the current newsgroup.
 620   (let ((hooks news-group-hook-alist))
 621     (while hooks
 622       (goto-char start)
 623       (if (string-match (car (car hooks)) news-group-name)
 624           (funcall (cdr (car hooks))))
 625       (setq hooks (cdr hooks))))
 626   (goto-char start)
 627   (forward-line 1)
 628   (if (eobp)
 629       (message "(Empty file?)")
 630     (goto-char start))))
 631
 632 (defun news-convert-format ()
 633   (save-excursion
 634     (save-restriction
 635       (let* ((start (point))
 636              (end (condition-case ()
 637                       (progn (search-forward "\n\n") (point))
 638                     (error nil)))
 639              has-from has-date)
 640        (cond (end
 641               (narrow-to-region start end)
 642               (goto-char start)
 643               (setq has-from (search-forward "\nFrom:" nil t))
 644               (cond ((and (not has-from) has-date)
 645                      (goto-char start)
 646                      (search-forward "\nDate:")
 647                      (beginning-of-line)
 648                      (kill-line) (kill-line)))
 649               (news-delete-headers start)
 650               (goto-char start)))))))
 651
 652 (defun news-show-all-headers ()
 653   "Redisplay current news item with all original headers"
 654   (interactive)
 655   (let (news-ignored-headers
 656         (buffer-read-only ()))
 657     (erase-buffer)
 658     (news-set-mode-line)
 659     (news-read-in-file
 660      (concat news-path
 661              (string-subst-char ?/ ?. news-current-news-group)
 662              "/" (int-to-string news-current-message-number)))))
 663
 664 (defun news-delete-headers (pos)
 665   (goto-char pos)
 666   (and (stringp news-ignored-headers)
 667        (while (re-search-forward news-ignored-headers nil t)
 668          (beginning-of-line)
 669          (delete-region (point)
 670                         (progn (re-search-forward "\n[^ \t]")
 671                                (forward-char -1)
 672                                (point))))))
 673
 674 (defun news-exit ()
 675   "Quit news reading session and update the .newsrc file."
 676   (interactive)
 677   (if (y-or-n-p "Do you really wanna quit reading news ? ")
 678       (progn (message "Updating %s..." news-startup-file)
 679              (news-update-newsrc-file)
 680              (news-write-certifications)
 681              (message "Updating %s... done" news-startup-file)
 682              (message "Now do some real work")
 683              (quit-window)
 684              (switch-to-buffer news-buffer-save)
 685              (setq news-user-group-list ()))
 686     (message "")))
 687
 688 (defun news-update-newsrc-file ()
 689   "Updates the .newsrc file in the users home dir."
 690   (let ((newsrcbuf (find-file-noselect
 691                      (substitute-in-file-name news-startup-file)))
 692         (tem news-user-group-list)
 693         group)
 694     (save-excursion
 695       (if (not (null news-current-news-group))
 696           (news-update-message-read news-current-news-group
 697                                     (news-cdar news-point-pdl)))
 698       (set-buffer newsrcbuf)
 699       (while tem
 700         (setq group (assoc (car tem) news-group-article-assoc))
 701         (if (= (news-cadr (news-cadr group)) (news-caddr (news-cadr group)))
 702             nil
 703           (goto-char 0)
 704           (if (search-forward (concat (car group) ": ") nil t)
 705               (kill-line nil)
 706             (insert (car group) ": \n") (backward-char 1))
 707           (insert (int-to-string (car (news-cadr group))) "-"
 708                   (int-to-string (news-cadr (news-cadr group)))))
 709         (setq tem (cdr tem)))
 710      (while news-unsubscribe-groups
 711        (setq group (assoc (car news-unsubscribe-groups)
 712                           news-group-article-assoc))
 713        (goto-char 0)
 714        (if (search-forward (concat (car group) ": ") nil t)
 715            (progn
 716               (backward-char 2)
 717               (kill-line nil)
 718               (insert "! " (int-to-string (car (news-cadr group)))
 719                       "-" (int-to-string (news-cadr (news-cadr group))))))
 720        (setq news-unsubscribe-groups (cdr news-unsubscribe-groups)))
 721      (save-buffer)
 722      (kill-buffer (current-buffer)))))
 723
 724
 725 (defun news-unsubscribe-group (group)
 726   "Removes you from newgroup GROUP."
 727   (interactive (list (completing-read  "Unsubscribe from group: "
 728                                       news-group-article-assoc)))
 729   (news-unsubscribe-internal group))
 730
 731 (defun news-unsubscribe-current-group ()
 732   "Removes you from the newsgroup you are now reading."
 733   (interactive)
 734   (if (y-or-n-p "Do you really want to unsubscribe from this group ? ")
 735       (news-unsubscribe-internal news-current-news-group)))
 736
 737 (defun news-unsubscribe-internal (group)
 738   (let ((tem (assoc group news-group-article-assoc)))
 739     (if tem
 740         (progn
 741           (setq news-unsubscribe-groups (cons group news-unsubscribe-groups))
 742           (news-update-message-read group (news-cdar news-point-pdl))
 743           (if (equal group news-current-news-group)
 744               (news-next-group))
 745           (message ""))
 746       (error "Not subscribed to group: %s" group))))
 747
 748 (defun news-save-item-in-file (file)
 749   "Save the current article that is being read by appending to a file."
 750   (interactive "FSave item in file: ")
 751   (append-to-file (point-min) (point-max) file))
 752
 753 (defun news-get-pruned-list-of-files (gp-list end-file-no)
 754   "Given a news group it finds all files in the news group.
 755 The arg must be in slashified format.
 756 Using ls was found to be too slow in a previous version."
 757   (let
 758       ((answer
 759         (and
 760          (not (and end-file-no
 761                    (equal (news-set-current-certifiable)
 762                      (news-group-certification gp-list))
 763                    (setq news-list-of-files nil
 764                          news-list-of-files-possibly-bogus t)))
 765          (let* ((file-directory (concat news-path
 766                                         (string-subst-char ?/ ?. gp-list)))
 767                 tem
 768                 (last-winner
 769                  (and end-file-no
 770                       (news-wins file-directory end-file-no)
 771                       (news-find-first-or-last file-directory end-file-no 1))))
 772            (setq news-list-of-files-possibly-bogus t news-list-of-files nil)
 773            (if last-winner
 774                (progn
 775                  (setq news-list-of-files-possibly-bogus t
 776                        news-current-group-end last-winner)
 777                  (while (> last-winner end-file-no)
 778                    (news-push last-winner news-list-of-files)
 779                    (setq last-winner (1- last-winner)))
 780                  news-list-of-files)
 781              (if (or (not (file-directory-p file-directory))
 782                      (not (file-readable-p file-directory)))
 783                  nil
 784                (setq news-list-of-files
 785                      (condition-case error
 786                          (directory-files file-directory)
 787                        (file-error
 788                         (if (string= (nth 2 error) "permission denied")
 789                             (message "Newsgroup %s is read-protected"
 790                                      gp-list)
 791                           (signal 'file-error (cdr error)))
 792                         nil)))
 793                (setq tem news-list-of-files)
 794                (while tem
 795                  (if (or (not (string-match "^[0-9]*$" (car tem)))
 796                          ;; don't get confused by directories that look like numbers
 797                          (file-directory-p
 798                           (concat file-directory "/" (car tem)))
 799                          (<= (string-to-number (car tem)) end-file-no))
 800                      (setq news-list-of-files
 801                            (delq (car tem) news-list-of-files)))
 802                  (setq tem (cdr tem)))
 803                (if (null news-list-of-files)
 804                    (progn (setq news-current-group-end 0)
 805                           nil)
 806                  (setq news-list-of-files
 807                        (mapcar 'string-to-number news-list-of-files))
 808                  (setq news-list-of-files (sort news-list-of-files '<))
 809                  (setq news-current-group-end
 810                        (elt news-list-of-files
 811                             (1- (length news-list-of-files))))
 812                  news-list-of-files)))))))
 813     (or answer (progn (news-set-current-group-certification) nil))))
 814
 815 (defun news-read-files-into-buffer (group reversep)
 816   (let* ((files-start-end (news-cadr (assoc group news-group-article-assoc)))
 817          (start-file-no (car files-start-end))
 818          (end-file-no (news-cadr files-start-end))
 819          (buffer-read-only nil))
 820     (setq news-current-news-group group)
 821     (setq news-current-message-number nil)
 822     (setq news-current-group-end nil)
 823     (news-set-mode-line)
 824     (news-get-pruned-list-of-files group end-file-no)
 825     (news-set-mode-line)
 826     ;; @@ should be a lot smarter than this if we have to move
 827     ;; @@ around correctly.
 828     (setq news-point-pdl (list (cons (car files-start-end)
 829                                      (news-cadr files-start-end))))
 830     (if (null news-list-of-files)
 831         (progn (erase-buffer)
 832                (setq news-current-group-end end-file-no)
 833                (setq news-current-group-begin end-file-no)
 834                (setq news-current-message-number end-file-no)
 835                (news-set-mode-line)
 836 ;              (message "No new articles in " group " group.")
 837                nil)
 838       (setq news-current-group-begin (car news-list-of-files))
 839       (if reversep
 840           (setq news-current-message-number news-current-group-end)
 841         (if (> (car news-list-of-files) end-file-no)
 842             (setcdr (car news-point-pdl) (car news-list-of-files)))
 843         (setq news-current-message-number news-current-group-begin))
 844       (news-set-message-counters)
 845       (news-set-mode-line)
 846       (news-read-in-file (concat news-path
 847                                  (string-subst-char ?/ ?. group)
 848                                  "/"
 849                                  (int-to-string
 850                                    news-current-message-number)))
 851       (news-set-message-counters)
 852       (news-set-mode-line)
 853       t)))
 854
 855 (defun news-add-news-group (gp)
 856   "Resubscribe to or add a USENET news group named GROUP (a string)."
 857 ; @@ (completing-read ...)
 858 ; @@ could be based on news library file ../active (slightly fascist)
 859 ; @@ or (expensive to compute) all directories under the news spool directory
 860   (interactive "sAdd news group: ")
 861   (let ((file-dir (concat news-path (string-subst-char ?/ ?. gp))))
 862     (save-excursion
 863       (if (null (assoc gp news-group-article-assoc))
 864           (let ((newsrcbuf (find-file-noselect
 865                             (substitute-in-file-name news-startup-file))))
 866             (if (file-directory-p file-dir)
 867                 (progn
 868                   (switch-to-buffer newsrcbuf)
 869                   (goto-char 0)
 870                   (if (search-forward (concat gp "! ") nil t)
 871                       (progn
 872                         (message "Re-subscribing to group %s." gp)
 873                         ;;@@ news-unsubscribe-groups isn't being used
 874                         ;;(setq news-unsubscribe-groups
 875                         ;;    (delq gp news-unsubscribe-groups))
 876                         (backward-char 2)
 877                         (delete-char 1)
 878                         (insert ":"))
 879                     (progn
 880                       (message
 881                        "Added %s to your list of newsgroups." gp)
 882                       (goto-char (point-max))
 883                       (insert gp ": 1-1\n")))
 884                   (search-backward gp nil t)
 885                   (let (start end endofline tem)
 886                     (search-forward ": " nil t)
 887                     (setq end (point))
 888                     (beginning-of-line)
 889                     (setq start (point))
 890                     (end-of-line)
 891                     (setq endofline (point))
 892                     (setq tem (buffer-substring start (- end 2)))
 893                     (let ((range (news-parse-range
 894                                   (buffer-substring end endofline))))
 895                       (setq news-group-article-assoc
 896                             (cons (list tem (list (car range)
 897                                                   (cdr range)
 898                                                   (cdr range)))
 899                                   news-group-article-assoc))))
 900                   (save-buffer)
 901                   (kill-buffer (current-buffer)))
 902               (message "Newsgroup %s doesn't exist." gp)))
 903         (message "Already subscribed to group %s." gp)))))
 904
 905 (defun news-make-link-to-message (number newname)
 906         "Forges a link to an rnews message numbered number (current if no arg)
 907 Good for hanging on to a message that might or might not be
 908 automatically deleted."
 909   (interactive "P
 910 FName to link to message: ")
 911   (add-name-to-file
 912    (concat news-path
 913            (string-subst-char ?/ ?. news-current-news-group)
 914            "/" (if number
 915                    (prefix-numeric-value number)
 916                  news-current-message-number))
 917    newname))
 918
 919 ;;; caesar-region written by phr@gnu.org  Nov 86
 920 ;;; modified by tower@gnu.org Nov 86
 921 (defun caesar-region (&optional n)
 922   "Caesar rotation of region by N, default 13, for decrypting netnews."
 923   (interactive (if current-prefix-arg   ; Was there a prefix arg?
 924                    (list (prefix-numeric-value current-prefix-arg))
 925                  (list nil)))
 926   (cond ((not (numberp n)) (setq n 13))
 927         (t (setq n (mod n 26))))        ;canonicalize N
 928   (if (not (zerop n))           ; no action needed for a rot of 0
 929       (progn
 930         (if (or (not (boundp 'caesar-translate-table))
 931                 (/= (aref caesar-translate-table ?a) (+ ?a n)))
 932             (let ((i 0) (lower "abcdefghijklmnopqrstuvwxyz") upper)
 933               (message "Building caesar-translate-table...")
 934               (setq caesar-translate-table (make-vector 256 0))
 935               (while (< i 256)
 936                 (aset caesar-translate-table i i)
 937                 (setq i (1+ i)))
 938               (setq lower (concat lower lower) upper (upcase lower) i 0)
 939               (while (< i 26)
 940                 (aset caesar-translate-table (+ ?a i) (aref lower (+ i n)))
 941                 (aset caesar-translate-table (+ ?A i) (aref upper (+ i n)))
 942                 (setq i (1+ i)))
 943               (message "Building caesar-translate-table... done")))
 944         (let ((from (region-beginning))
 945               (to (region-end))
 946               (i 0) str len)
 947           (setq str (buffer-substring from to))
 948           (setq len (length str))
 949           (while (< i len)
 950             (aset str i (aref caesar-translate-table (aref str i)))
 951             (setq i (1+ i)))
 952           (goto-char from)
 953           (kill-region from to)
 954           (insert str)))))
 955
 956 ;;; news-caesar-buffer-body written by paul@media-lab.mit.edu  Wed Oct 1, 1986
 957 ;;; hacked further by tower@gnu.org
 958 (defun news-caesar-buffer-body (&optional rotnum)
 959   "Caesar rotates all letters in the current buffer by 13 places.
 960 Used to encode/decode possibly offensive messages (commonly in net.jokes).
 961 With prefix arg, specifies the number of places to rotate each letter forward.
 962 Mail and USENET news headers are not rotated."
 963   (interactive (if current-prefix-arg   ; Was there a prefix arg?
 964                    (list (prefix-numeric-value current-prefix-arg))
 965                  (list nil)))
 966   (save-excursion
 967     (let ((buffer-status buffer-read-only))
 968       (setq buffer-read-only nil)
 969       ;; setup the region
 970       (set-mark (if (equal major-mode 'news-mode)
 971                     (progn (goto-char (point-min))
 972                            (search-forward "\n\n" nil t))
 973                   (mail-text-start)))
 974       (goto-char (point-max))
 975       (caesar-region rotnum)
 976       (setq buffer-read-only buffer-status))))
 977
 978 (provide 'rnews)
 979
 980 ;; arch-tag: c032a20b-cafb-466c-b3fa-5be404a18f8c
 981 ;;; rnews.el ends here