lisp/gnus/nnkiboze.el

   1 ;;; nnkiboze.el --- select virtual news access for Gnus
   2
   3 ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000
   4 ;;      Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   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 2, 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., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; The other access methods (nntp, nnspool, etc) are general news
  29 ;; access methods.  This module relies on Gnus and can't be used
  30 ;; separately.
  31
  32 ;;; Code:
  33
  34 (require 'nntp)
  35 (require 'nnheader)
  36 (require 'gnus)
  37 (require 'gnus-score)
  38 (require 'nnoo)
  39 (require 'mm-util)
  40 (eval-when-compile (require 'cl))
  41
  42 (nnoo-declare nnkiboze)
  43 (defvoo nnkiboze-directory (nnheader-concat gnus-directory "kiboze/")
  44   "nnkiboze will put its files in this directory.")
  45
  46 (defvoo nnkiboze-level 9
  47   "The maximum level to be searched for articles.")
  48
  49 (defvoo nnkiboze-remove-read-articles t
  50   "If non-nil, nnkiboze will remove read articles from the kiboze group.")
  51
  52 (defvoo nnkiboze-ephemeral nil
  53   "If non-nil, don't store any data anywhere.")
  54
  55 (defvoo nnkiboze-scores nil
  56   "Score rules for generating the nnkiboze group.")
  57
  58 (defvoo nnkiboze-regexp nil
  59   "Regexp for matching component groups.")
  60
  61 (defvoo nnkiboze-file-coding-system mm-text-coding-system
  62   "Coding system for nnkiboze files.")
  63
  64 \f
  65
  66 (defconst nnkiboze-version "nnkiboze 1.0")
  67
  68 (defvoo nnkiboze-current-group nil)
  69 (defvoo nnkiboze-status-string "")
  70
  71 (defvoo nnkiboze-headers nil)
  72
  73 \f
  74
  75 ;;; Interface functions.
  76
  77 (nnoo-define-basics nnkiboze)
  78
  79 (deffoo nnkiboze-retrieve-headers (articles &optional group server fetch-old)
  80   (nnkiboze-possibly-change-group group)
  81   (unless gnus-nov-is-evil
  82     (if (stringp (car articles))
  83         'headers
  84       (let ((nov (nnkiboze-nov-file-name)))
  85         (when (file-exists-p nov)
  86           (save-excursion
  87             (set-buffer nntp-server-buffer)
  88             (erase-buffer)
  89             (let ((nnheader-file-coding-system nnkiboze-file-coding-system))
  90               (nnheader-insert-file-contents nov))
  91             (nnheader-nov-delete-outside-range
  92              (car articles) (car (last articles)))
  93             'nov))))))
  94
  95 (deffoo nnkiboze-request-article (article &optional newsgroup server buffer)
  96   (nnkiboze-possibly-change-group newsgroup)
  97   (if (not (numberp article))
  98       ;; This is a real kludge.  It might not work at times, but it
  99       ;; does no harm I think.  The only alternative is to offer no
 100       ;; article fetching by message-id at all.
 101       (nntp-request-article article newsgroup gnus-nntp-server buffer)
 102     (let* ((header (gnus-summary-article-header article))
 103            (xref (mail-header-xref header))
 104            num group)
 105       (unless xref
 106         (error "nnkiboze: No xref"))
 107       (unless (string-match " \\([^ ]+\\):\\([0-9]+\\)" xref)
 108         (error "nnkiboze: Malformed xref"))
 109       (setq num (string-to-int (match-string 2 xref))
 110             group (match-string 1 xref))
 111       (or (with-current-buffer buffer
 112             (gnus-cache-request-article num group))
 113           (gnus-request-article num group buffer)))))
 114
 115 (deffoo nnkiboze-request-scan (&optional group server)
 116   (nnkiboze-generate-group (concat "nnkiboze:" group)))
 117
 118 (deffoo nnkiboze-request-group (group &optional server dont-check)
 119   "Make GROUP the current newsgroup."
 120   (nnkiboze-possibly-change-group group)
 121   (if dont-check
 122       t
 123     (let ((nov-file (nnkiboze-nov-file-name))
 124           beg end total)
 125       (save-excursion
 126         (set-buffer nntp-server-buffer)
 127         (erase-buffer)
 128         (unless (file-exists-p nov-file)
 129           (nnkiboze-request-scan group))
 130         (if (not (file-exists-p nov-file))
 131             (nnheader-report 'nnkiboze "Can't select group %s" group)
 132           (let ((nnheader-file-coding-system nnkiboze-file-coding-system))
 133             (nnheader-insert-file-contents nov-file))
 134           (if (zerop (buffer-size))
 135               (nnheader-insert "211 0 0 0 %s\n" group)
 136             (goto-char (point-min))
 137             (when (looking-at "[0-9]+")
 138               (setq beg (read (current-buffer))))
 139             (goto-char (point-max))
 140             (when (re-search-backward "^[0-9]" nil t)
 141               (setq end (read (current-buffer))))
 142             (setq total (count-lines (point-min) (point-max)))
 143             (nnheader-insert "211 %d %d %d %s\n" total beg end group)))))))
 144
 145 (deffoo nnkiboze-close-group (group &optional server)
 146   (nnkiboze-possibly-change-group group)
 147   ;; Remove NOV lines of articles that are marked as read.
 148   (when (and (file-exists-p (nnkiboze-nov-file-name))
 149              nnkiboze-remove-read-articles)
 150     (let ((coding-system-for-write nnkiboze-file-coding-system))
 151       (with-temp-file (nnkiboze-nov-file-name)
 152         (let ((cur (current-buffer))
 153               (nnheader-file-coding-system nnkiboze-file-coding-system))
 154           (nnheader-insert-file-contents (nnkiboze-nov-file-name))
 155           (goto-char (point-min))
 156           (while (not (eobp))
 157             (if (not (gnus-article-read-p (read cur)))
 158                 (forward-line 1)
 159               (gnus-delete-line))))))
 160     (setq nnkiboze-current-group nil)))
 161
 162 (deffoo nnkiboze-open-server (server &optional defs)
 163   (unless (assq 'nnkiboze-regexp defs)
 164     (push `(nnkiboze-regexp ,server)
 165           defs))
 166   (nnoo-change-server 'nnkiboze server defs))
 167
 168 (deffoo nnkiboze-request-delete-group (group &optional force server)
 169   (nnkiboze-possibly-change-group group)
 170   (when force
 171     (let ((files (nconc
 172                   (nnkiboze-score-file group)
 173                   (list (nnkiboze-nov-file-name)
 174                         (nnkiboze-nov-file-name ".newsrc")))))
 175       (while files
 176         (and (file-exists-p (car files))
 177              (file-writable-p (car files))
 178              (delete-file (car files)))
 179         (setq files (cdr files)))))
 180   (setq nnkiboze-current-group nil)
 181   t)
 182
 183 (nnoo-define-skeleton nnkiboze)
 184
 185 \f
 186 ;;; Internal functions.
 187
 188 (defun nnkiboze-possibly-change-group (group)
 189   (setq nnkiboze-current-group group))
 190
 191 (defun nnkiboze-prefixed-name (group)
 192   (gnus-group-prefixed-name group '(nnkiboze "")))
 193
 194 ;;;###autoload
 195 (defun nnkiboze-generate-groups ()
 196   "\"Usage: emacs -batch -l nnkiboze -f nnkiboze-generate-groups\".
 197 Finds out what articles are to be part of the nnkiboze groups."
 198   (interactive)
 199   (let ((nnmail-spool-file nil)
 200         (mail-sources nil)
 201         (gnus-use-dribble-file nil)
 202         (gnus-read-active-file t)
 203         (gnus-expert-user t))
 204     (gnus))
 205   (let* ((gnus-newsrc-alist (gnus-copy-sequence gnus-newsrc-alist))
 206          (newsrc (cdr gnus-newsrc-alist))
 207          gnus-newsrc-hashtb info)
 208     (gnus-make-hashtable-from-newsrc-alist)
 209     ;; We have copied all the newsrc alist info over to local copies
 210     ;; so that we can mess all we want with these lists.
 211     (while (setq info (pop newsrc))
 212       (when (string-match "nnkiboze" (gnus-info-group info))
 213         ;; For each kiboze group, we call this function to generate
 214         ;; it.
 215         (nnkiboze-generate-group (gnus-info-group info) t))))
 216   (save-excursion
 217     (set-buffer gnus-group-buffer)
 218     (gnus-group-list-groups)))
 219
 220 (defun nnkiboze-score-file (group)
 221   (list (expand-file-name
 222          (concat (file-name-as-directory gnus-kill-files-directory)
 223                  (nnheader-translate-file-chars
 224                   (concat (nnkiboze-prefixed-name nnkiboze-current-group)
 225                           "." gnus-score-file-suffix))))))
 226
 227 (defun nnkiboze-generate-group (group &optional inhibit-list-groups)
 228   (let* ((info (nth 2 (gnus-gethash group gnus-newsrc-hashtb)))
 229          (newsrc-file (concat nnkiboze-directory
 230                               (nnheader-translate-file-chars
 231                                (concat group ".newsrc"))))
 232          (nov-file (concat nnkiboze-directory
 233                            (nnheader-translate-file-chars
 234                             (concat group ".nov"))))
 235          method nnkiboze-newsrc gname newsrc active
 236          ginfo lowest glevel orig-info nov-buffer
 237          ;; Bind various things to nil to make group entry faster.
 238          (gnus-expert-user t)
 239          (gnus-large-newsgroup nil)
 240          (gnus-score-find-score-files-function 'nnkiboze-score-file)
 241          ;; Use only nnkiboze-score-file!
 242          (gnus-score-use-all-scores nil)
 243          (gnus-use-scoring t)
 244          (gnus-verbose (min gnus-verbose 3))
 245          gnus-select-group-hook gnus-summary-prepare-hook
 246          gnus-thread-sort-functions gnus-show-threads
 247          gnus-visual gnus-suppress-duplicates num-unread)
 248     (unless info
 249       (error "No such group: %s" group))
 250     ;; Load the kiboze newsrc file for this group.
 251     (when (file-exists-p newsrc-file)
 252       (load newsrc-file))
 253     (let ((coding-system-for-write nnkiboze-file-coding-system))
 254       (with-temp-file nov-file
 255         (when (file-exists-p nov-file)
 256           (insert-file-contents nov-file))
 257         (setq nov-buffer (current-buffer))
 258         ;; Go through the active hashtb and add new all groups that match the
 259         ;; kiboze regexp.
 260         (mapatoms
 261          (lambda (group)
 262            (and (string-match nnkiboze-regexp
 263                               (setq gname (symbol-name group))) ; Match
 264                 (not (assoc gname nnkiboze-newsrc)) ; It isn't registered
 265                 (numberp (car (symbol-value group))) ; It is active
 266                 (or (> nnkiboze-level 7)
 267                     (and (setq glevel (nth 1 (nth 2 (gnus-gethash
 268                                                      gname gnus-newsrc-hashtb))))
 269                          (>= nnkiboze-level glevel)))
 270                 (not (string-match "^nnkiboze:" gname)) ; Exclude kibozes
 271                 (push (cons gname (1- (car (symbol-value group))))
 272                       nnkiboze-newsrc)))
 273          gnus-active-hashtb)
 274         ;; `newsrc' is set to the list of groups that possibly are
 275         ;; component groups to this kiboze group.  This list has elements
 276         ;; on the form `(GROUP . NUMBER)', where NUMBER is the highest
 277         ;; number that has been kibozed in GROUP in this kiboze group.
 278         (setq newsrc nnkiboze-newsrc)
 279         (while newsrc
 280           (if (not (setq active (gnus-gethash
 281                                  (caar newsrc) gnus-active-hashtb)))
 282               ;; This group isn't active after all, so we remove it from
 283               ;; the list of component groups.
 284               (setq nnkiboze-newsrc (delq (car newsrc) nnkiboze-newsrc))
 285             (setq lowest (cdar newsrc))
 286             ;; Ok, we have a valid component group, so we jump to it.
 287             (switch-to-buffer gnus-group-buffer)
 288             (gnus-group-jump-to-group (caar newsrc))
 289             (gnus-message 3 "nnkiboze: Checking %s..." (caar newsrc))
 290             (setq ginfo (gnus-get-info (gnus-group-group-name))
 291                   orig-info (gnus-copy-sequence ginfo)
 292                   num-unread (car (gnus-gethash (caar newsrc)
 293                                                 gnus-newsrc-hashtb)))
 294             (unwind-protect
 295                 (progn
 296                   ;; We set all list of article marks to nil.  Since we operate
 297                   ;; on copies of the real lists, we can destroy anything we
 298                   ;; want here.
 299                   (when (nth 3 ginfo)
 300                     (setcar (nthcdr 3 ginfo) nil))
 301                   ;; We set the list of read articles to be what we expect for
 302                   ;; this kiboze group -- either nil or `(1 . LOWEST)'.
 303                   (when ginfo
 304                     (setcar (nthcdr 2 ginfo)
 305                             (and (not (= lowest 1)) (cons 1 lowest))))
 306                   (when (and (or (not ginfo)
 307                                  (> (length (gnus-list-of-unread-articles
 308                                              (car ginfo)))
 309                                     0))
 310                              (progn
 311                                (ignore-errors
 312                                  (gnus-group-select-group nil))
 313                                (eq major-mode 'gnus-summary-mode)))
 314                     ;; We are now in the group where we want to be.
 315                     (setq method (gnus-find-method-for-group
 316                                   gnus-newsgroup-name))
 317                     (when (eq method gnus-select-method)
 318                       (setq method nil))
 319                     ;; We go through the list of scored articles.
 320                     (while gnus-newsgroup-scored
 321                       (when (> (caar gnus-newsgroup-scored) lowest)
 322                         ;; If it has a good score, then we enter this article
 323                         ;; into the kiboze group.
 324                         (nnkiboze-enter-nov
 325                          nov-buffer
 326                          (gnus-summary-article-header
 327                           (caar gnus-newsgroup-scored))
 328                          gnus-newsgroup-name))
 329                       (setq gnus-newsgroup-scored (cdr gnus-newsgroup-scored)))
 330                     ;; That's it.  We exit this group.
 331                     (when (eq major-mode 'gnus-summary-mode)
 332                       (kill-buffer (current-buffer)))))
 333               ;; Restore the proper info.
 334               (when ginfo
 335                 (setcdr ginfo (cdr orig-info)))
 336               (setcar (gnus-gethash (caar newsrc) gnus-newsrc-hashtb)
 337                       num-unread)))
 338           (setcdr (car newsrc) (car active))
 339           (gnus-message 3 "nnkiboze: Checking %s...done" (caar newsrc))
 340           (setq newsrc (cdr newsrc)))))
 341     ;; We save the kiboze newsrc for this group.
 342     (with-temp-file newsrc-file
 343       (insert "(setq nnkiboze-newsrc '")
 344       (gnus-prin1 nnkiboze-newsrc)
 345       (insert ")\n")))
 346   (unless inhibit-list-groups
 347     (save-excursion
 348       (set-buffer gnus-group-buffer)
 349       (gnus-group-list-groups)))
 350   t)
 351
 352 (defun nnkiboze-enter-nov (buffer header group)
 353   (save-excursion
 354     (set-buffer buffer)
 355     (goto-char (point-max))
 356     (let ((prefix (gnus-group-real-prefix group))
 357           (oheader (copy-sequence header))
 358           article)
 359       (if (zerop (forward-line -1))
 360           (progn
 361             (setq article (1+ (read (current-buffer))))
 362             (forward-line 1))
 363         (setq article 1))
 364       (mail-header-set-number oheader article)
 365       (with-temp-buffer
 366         (insert (or (mail-header-xref oheader) ""))
 367         (goto-char (point-min))
 368         (if (re-search-forward " [^ ]+:[0-9]+" nil t)
 369             (goto-char (match-beginning 0))
 370           (or (eobp) (forward-char 1)))
 371         ;; The first Xref has to be the group this article
 372         ;; really came for - this is the article nnkiboze
 373         ;; will request when it is asked for the article.
 374         (insert " " group ":"
 375                 (int-to-string (mail-header-number header)) " ")
 376         (while (re-search-forward " [^ ]+:[0-9]+" nil t)
 377           (goto-char (1+ (match-beginning 0)))
 378           (insert prefix))
 379         (mail-header-set-xref oheader (buffer-string)))
 380       (nnheader-insert-nov oheader))))
 381
 382 (defun nnkiboze-nov-file-name (&optional suffix)
 383   (concat (file-name-as-directory nnkiboze-directory)
 384           (nnheader-translate-file-chars
 385            (concat (nnkiboze-prefixed-name nnkiboze-current-group)
 386                    (or suffix ".nov")))))
 387
 388 (provide 'nnkiboze)
 389
 390 ;;; nnkiboze.el ends here