1 ;;; gnus-registry.el --- article registry for Gnus
2 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 ;; Free Software Foundation, Inc.
5 ;; Author: Ted Zlatanov <tzz@lifelogs.com>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
29 (eval-when-compile (require 'cl))
36 (defvar gnus-registry-dirty t
37 "Boolean set to t when the registry is modified")
39 (defgroup gnus-registry nil
43 (defvar gnus-registry-hashtb nil
44 "*The article registry by Message ID.")
46 (defcustom gnus-registry-unfollowed-groups '("delayed" "drafts" "queue")
47 "List of groups that gnus-registry-split-fancy-with-parent won't follow.
48 The group names are matched, they don't have to be fully qualified."
50 :type '(repeat string))
52 (defcustom gnus-registry-install nil
53 "Whether the registry should be installed."
57 (defcustom gnus-registry-clean-empty t
58 "Whether the empty registry entries should be deleted.
59 Registry entries are considered empty when they have no groups."
63 (defcustom gnus-registry-use-long-group-names nil
64 "Whether the registry should use long group names (BUGGY)."
68 (defcustom gnus-registry-trim-articles-without-groups t
69 "Whether the registry should clean out message IDs without groups."
73 (defcustom gnus-registry-cache-file "~/.gnus.registry.eld"
74 "File where the Gnus registry will be stored."
78 (defcustom gnus-registry-max-entries nil
79 "Maximum number of entries in the registry, nil for unlimited."
81 :type '(radio (const :format "Unlimited " nil)
82 (integer :format "Maximum number: %v\n" :size 0)))
84 ;; Function(s) missing in Emacs 20
85 (when (memq nil (mapcar 'fboundp '(puthash)))
87 (unless (fboundp 'puthash)
88 ;; alias puthash is missing from Emacs 20 cl-extra.el
89 (defalias 'puthash 'cl-puthash)))
91 (defun gnus-registry-cache-read ()
92 "Read the registry cache file."
94 (let ((file gnus-registry-cache-file))
95 (when (file-exists-p file)
96 (gnus-message 5 "Reading %s..." file)
98 (gnus-message 5 "Reading %s...done" file))))
100 (defun gnus-registry-cache-save ()
101 "Save the registry cache file."
103 (let ((file gnus-registry-cache-file))
105 (set-buffer (gnus-get-buffer-create " *Gnus-registry-cache*"))
106 (make-local-variable 'version-control)
107 (setq version-control gnus-backup-startup-file)
108 (setq buffer-file-name file)
109 (setq default-directory (file-name-directory buffer-file-name))
110 (buffer-disable-undo)
112 (gnus-message 5 "Saving %s..." file)
113 (if gnus-save-startup-file-via-temp-buffer
114 (let ((coding-system-for-write gnus-ding-file-coding-system)
115 (standard-output (current-buffer)))
116 (gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist)
117 (gnus-registry-cache-whitespace file)
119 (let ((coding-system-for-write gnus-ding-file-coding-system)
120 (version-control gnus-backup-startup-file)
122 (working-dir (file-name-directory file))
125 ;; Generate the name of a non-existent file.
126 (while (progn (setq working-file
128 (if (and (eq system-type 'ms-dos)
129 (not (gnus-long-file-names)))
130 "%s#%d.tm#" ; MSDOS limits files to 8+3
131 (if (memq system-type '(vax-vms axp-vms))
134 working-dir (setq i (1+ i))))
135 (file-exists-p working-file)))
139 (gnus-with-output-to-file working-file
140 (gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist))
142 ;; These bindings will mislead the current buffer
143 ;; into thinking that it is visiting the startup
145 (let ((buffer-backed-up nil)
146 (buffer-file-name startup-file)
147 (file-precious-flag t)
148 (setmodes (file-modes startup-file)))
149 ;; Backup the current version of the startup file.
152 ;; Replace the existing startup file with the temp file.
153 (rename-file working-file startup-file t)
154 (set-file-modes startup-file setmodes)))
156 (delete-file working-file)
159 (gnus-kill-buffer (current-buffer))
160 (gnus-message 5 "Saving %s...done" file))))
162 ;; Idea from Dan Christensen <jdc@chow.mat.jhu.edu>
163 ;; Save the gnus-registry file with extra line breaks.
164 (defun gnus-registry-cache-whitespace (filename)
165 (gnus-message 5 "Adding whitespace to %s" filename)
167 (goto-char (point-min))
168 (while (re-search-forward "^(\\|(\\\"" nil t)
169 (replace-match "\n\\&" t))
170 (goto-char (point-min))
171 (while (re-search-forward " $" nil t)
172 (replace-match "" t t))))
174 (defun gnus-registry-save (&optional force)
175 (when (or gnus-registry-dirty force)
176 ;; remove empty entries
177 (when gnus-registry-clean-empty
178 (gnus-registry-clean-empty-function))
179 ;; now trim the registry appropriately
180 (setq gnus-registry-alist (gnus-registry-trim
181 (hashtable-to-alist gnus-registry-hashtb)))
183 (gnus-registry-cache-save)
184 (setq gnus-registry-dirty nil)))
186 (defun gnus-registry-clean-empty-function ()
187 "Remove all empty entries from the registry. Returns count thereof."
191 (unless (gnus-registry-fetch-group key)
193 (remhash key gnus-registry-hashtb)))
194 gnus-registry-hashtb)
197 (defun gnus-registry-read ()
198 (gnus-registry-cache-read)
199 (setq gnus-registry-hashtb (alist-to-hashtable gnus-registry-alist))
200 (setq gnus-registry-dirty nil))
202 (defun gnus-registry-trim (alist)
203 "Trim alist to size, using gnus-registry-max-entries."
204 (if (null gnus-registry-max-entries)
205 alist ; just return the alist
206 ;; else, when given max-entries, trim the alist
207 (let ((timehash (make-hash-table
212 (puthash key (gnus-registry-fetch-extra key 'mtime) timehash))
213 gnus-registry-hashtb)
215 ;; we use the return value of this setq, which is the trimmed alist
218 (- (length alist) gnus-registry-max-entries)
222 (cdr (gethash (car a) timehash))
223 (cdr (gethash (car b) timehash))))))))))
225 (defun alist-to-hashtable (alist)
226 "Build a hashtable from the values in ALIST."
227 (let ((ht (make-hash-table
232 (puthash (car kv-pair) (cdr kv-pair) ht))
236 (defun hashtable-to-alist (hash)
237 "Build an alist from the values in HASH."
241 (setq list (cons (cons key value) list)))
245 (defun gnus-register-action (action data-header from &optional to method)
246 (let* ((id (mail-header-id data-header))
247 (from (gnus-group-guess-full-name from))
248 (to (if to (gnus-group-guess-full-name to) nil))
249 (to-name (if to to "the Bit Bucket"))
250 (old-entry (gethash id gnus-registry-hashtb)))
251 (gnus-message 5 "Registry: article %s %s from %s to %s"
253 (if method "respooling" "going")
257 ;; All except copy will need a delete
258 (gnus-registry-delete-group id from)
260 (when (equal 'copy action)
261 (gnus-registry-add-group id from)) ; undo the delete
263 (gnus-registry-add-group id to)))
265 (defun gnus-register-spool-action (id group)
266 ;; do not process the draft IDs
267 ; (unless (string-match "totally-fudged-out-message-id" id)
268 ; (let ((group (gnus-group-guess-full-name group)))
269 (when (string-match "\r$" id)
270 (setq id (substring id 0 -1)))
271 (gnus-message 5 "Registry: article %s spooled to %s"
274 (gnus-registry-add-group id group))
277 ;; Function for nn{mail|imap}-split-fancy: look up all references in
278 ;; the cache and if a match is found, return that group.
279 (defun gnus-registry-split-fancy-with-parent ()
280 "Split this message into the same group as its parent. The parent
281 is obtained from the registry. This function can be used as an entry
282 in `nnmail-split-fancy' or `nnimap-split-fancy', for example like
283 this: (: gnus-registry-split-fancy-with-parent)
285 For a message to be split, it looks for the parent message in the
286 References or In-Reply-To header and then looks in the registry to
287 see which group that message was put in. This group is returned.
289 See the Info node `(gnus)Fancy Mail Splitting' for more details."
290 (let ((refstr (or (message-fetch-field "references")
291 (message-fetch-field "in-reply-to")))
292 (nnmail-split-fancy-with-parent-ignore-groups
293 (if (listp nnmail-split-fancy-with-parent-ignore-groups)
294 nnmail-split-fancy-with-parent-ignore-groups
295 (list nnmail-split-fancy-with-parent-ignore-groups)))
298 (setq references (nreverse (gnus-split-references refstr)))
300 (setq res (or (gnus-registry-fetch-group x) res))
301 (when (or (gnus-registry-grep-in-list
303 gnus-registry-unfollowed-groups)
304 (gnus-registry-grep-in-list
306 nnmail-split-fancy-with-parent-ignore-groups))
311 "gnus-registry-split-fancy-with-parent traced %s to group %s"
312 refstr (if res res "nil"))
315 (defun gnus-registry-register-message-ids ()
316 "Register the Message-ID of every article in the group"
317 (unless (gnus-parameter-registry-ignore gnus-newsgroup-name)
318 (dolist (article gnus-newsgroup-articles)
319 (let ((id (gnus-registry-fetch-message-id-fast article)))
320 (unless (gnus-registry-fetch-group id)
321 (gnus-message 9 "Registry: Registering article %d with group %s"
322 article gnus-newsgroup-name)
323 (gnus-registry-add-group (gnus-registry-fetch-message-id-fast article)
324 gnus-newsgroup-name))))))
326 (defun gnus-registry-fetch-message-id-fast (article)
327 "Fetch the Message-ID quickly, using the internal gnus-data-list function"
328 (if (and (numberp article)
329 (assoc article (gnus-data-list nil)))
330 (mail-header-id (gnus-data-header (assoc article (gnus-data-list nil))))
333 (defun gnus-registry-grep-in-list (word list)
339 (string-match x word))
342 (defun gnus-registry-fetch-extra (id &optional entry)
343 "Get the extra data of a message, based on the message ID.
344 Returns the first place where the trail finds a nonstring."
345 (let ((trail (gethash id gnus-registry-hashtb)))
346 (dolist (crumb trail)
347 (unless (stringp crumb)
348 (return (gnus-registry-fetch-extra-entry crumb entry))))))
350 (defun gnus-registry-fetch-extra-entry (alist &optional entry)
351 "Get the extra data of a message, or a specific entry in it."
356 (defun gnus-registry-store-extra (id extra)
357 "Store the extra data of a message, based on the message ID.
358 The message must have at least one group name."
359 (when (gnus-registry-group-count id)
360 ;; we now know the trail has at least 1 group name, so it's not empty
361 (let ((trail (gethash id gnus-registry-hashtb))
362 (old-extra (gnus-registry-fetch-extra id)))
363 (puthash id (cons extra (delete old-extra trail))
364 gnus-registry-hashtb)
365 (setq gnus-registry-dirty t))))
367 (defun gnus-registry-store-extra-entry (id key value)
368 "Put a specific entry in the extras field of the registry entry for id."
369 (let* ((extra (gnus-registry-fetch-extra id))
370 (alist (cons (cons key value)
371 (gnus-assq-delete-all key (gnus-registry-fetch-extra id)))))
372 (gnus-registry-store-extra id alist)))
374 (defun gnus-registry-fetch-group (id)
375 "Get the group of a message, based on the message ID.
376 Returns the first place where the trail finds a group name."
377 (when (gnus-registry-group-count id)
378 ;; we now know the trail has at least 1 group name
379 (let ((trail (gethash id gnus-registry-hashtb)))
380 (dolist (crumb trail)
381 (when (stringp crumb)
382 (return (gnus-group-short-name crumb)))))))
384 (defun gnus-registry-group-count (id)
385 "Get the number of groups of a message, based on the message ID."
386 (let ((trail (gethash id gnus-registry-hashtb)))
387 (if (and trail (listp trail))
388 (apply '+ (mapcar (lambda (x) (if (stringp x) 1 0)) trail))
391 (defun gnus-registry-delete-group (id group)
392 "Delete a group for a message, based on the message ID."
395 (let ((trail (gethash id gnus-registry-hashtb))
396 (group (gnus-group-short-name group)))
397 (puthash id (if trail
400 gnus-registry-hashtb))
401 ;; now, clear the entry if there are no more groups
402 (when gnus-registry-trim-articles-without-groups
403 (unless (gnus-registry-group-count id)
404 (remhash id gnus-registry-hashtb)))
405 (gnus-registry-store-extra-entry id 'mtime (current-time)))))
407 (defun gnus-registry-add-group (id group &rest extra)
408 "Add a group for a message, based on the message ID."
409 ;; make sure there are no duplicate entries
412 (not (string-match "totally-fudged-out-message-id" id)))
413 (let ((full-group group)
414 (group (if gnus-registry-use-long-group-names
416 (gnus-group-short-name group))))
417 (gnus-registry-delete-group id group)
418 (unless gnus-registry-use-long-group-names
419 (gnus-registry-delete-group id full-group))
420 (let ((trail (gethash id gnus-registry-hashtb)))
421 (puthash id (if trail
424 gnus-registry-hashtb)
425 (when extra (gnus-registry-store-extra id extra))
426 (gnus-registry-store-extra-entry id 'mtime (current-time)))))))
428 (defun gnus-registry-clear ()
429 "Clear the Gnus registry."
431 (setq gnus-registry-alist nil)
432 (setq gnus-registry-hashtb (alist-to-hashtable gnus-registry-alist))
433 (setq gnus-registry-dirty t))
435 (defun gnus-registry-install-hooks ()
436 "Install the registry hooks."
438 (add-hook 'gnus-summary-article-move-hook 'gnus-register-action)
439 (add-hook 'gnus-summary-article-delete-hook 'gnus-register-action)
440 (add-hook 'gnus-summary-article-expire-hook 'gnus-register-action)
441 (add-hook 'nnmail-spool-hook 'gnus-register-spool-action)
443 (add-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
444 (add-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
446 (add-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
448 (defun gnus-registry-unload-hook ()
449 "Uninstall the registry hooks."
451 (remove-hook 'gnus-summary-article-move-hook 'gnus-register-action)
452 (remove-hook 'gnus-summary-article-delete-hook 'gnus-register-action)
453 (remove-hook 'gnus-summary-article-expire-hook 'gnus-register-action)
454 (remove-hook 'nnmail-spool-hook 'gnus-register-spool-action)
456 (remove-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
457 (remove-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
459 (remove-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
461 (when gnus-registry-install
462 (gnus-registry-install-hooks)
463 (gnus-registry-read))
465 ;; TODO: a lot of things
467 (provide 'gnus-registry)
469 ;;; gnus-registry.el ends here