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.
27 ;; This is the gnus-registry.el package, works with other backends
28 ;; besides nnmail. The major issue is that it doesn't go across
29 ;; backends, so for instance if an article is in nnml:sys and you see
30 ;; a reference to it in nnimap splitting, the article will end up in
33 ;; gnus-registry.el intercepts article respooling, moving, deleting,
34 ;; and copying for all backends. If it doesn't work correctly for
35 ;; you, submit a bug report and I'll be glad to fix it. It needs
36 ;; documentation in the manual (also on my to-do list).
38 ;; Put this in your startup file (~/.gnus.el for instance)
40 ;; (setq gnus-registry-max-entries 2500
41 ;; gnus-registry-use-long-group-names t)
43 ;; (gnus-registry-initialize)
45 ;; Then use this in your fancy-split:
47 ;; (: gnus-registry-split-fancy-with-parent)
51 ;; - get the correct group on spool actions
53 ;; - articles that are spooled to a different backend should be handled
57 (eval-when-compile (require 'cl))
64 (defvar gnus-registry-dirty t
65 "Boolean set to t when the registry is modified")
67 (defgroup gnus-registry nil
71 (defvar gnus-registry-hashtb nil
72 "*The article registry by Message ID.")
74 (defcustom gnus-registry-unfollowed-groups '("delayed" "drafts" "queue")
75 "List of groups that gnus-registry-split-fancy-with-parent won't follow.
76 The group names are matched, they don't have to be fully qualified."
78 :type '(repeat string))
80 (defcustom gnus-registry-install nil
81 "Whether the registry should be installed."
85 (defcustom gnus-registry-clean-empty t
86 "Whether the empty registry entries should be deleted.
87 Registry entries are considered empty when they have no groups."
91 (defcustom gnus-registry-use-long-group-names nil
92 "Whether the registry should use long group names (BUGGY)."
96 (defcustom gnus-registry-track-extra nil
97 "Whether the registry should track extra data about a message.
98 The Subject and Sender (From:) headers are currently tracked this
100 :group 'gnus-registry
102 '(set :tag "Tracking choices"
103 (const :tag "Track by subject (Subject: header)" subject)
104 (const :tag "Track by sender (From: header)" sender)))
106 (defcustom gnus-registry-entry-caching t
107 "Whether the registry should cache extra information."
108 :group 'gnus-registry
111 (defcustom gnus-registry-minimum-subject-length 5
112 "The minimum length of a subject before it's considered trackable."
113 :group 'gnus-registry
116 (defcustom gnus-registry-trim-articles-without-groups t
117 "Whether the registry should clean out message IDs without groups."
118 :group 'gnus-registry
121 (defcustom gnus-registry-cache-file "~/.gnus.registry.eld"
122 "File where the Gnus registry will be stored."
123 :group 'gnus-registry
126 (defcustom gnus-registry-max-entries nil
127 "Maximum number of entries in the registry, nil for unlimited."
128 :group 'gnus-registry
129 :type '(radio (const :format "Unlimited " nil)
130 (integer :format "Maximum number: %v\n" :size 0)))
132 ;; Function(s) missing in Emacs 20
133 (when (memq nil (mapcar 'fboundp '(puthash)))
135 (unless (fboundp 'puthash)
136 ;; alias puthash is missing from Emacs 20 cl-extra.el
137 (defalias 'puthash 'cl-puthash)))
139 (defun gnus-registry-track-subject-p ()
140 (memq 'subject gnus-registry-track-extra))
142 (defun gnus-registry-track-sender-p ()
143 (memq 'sender gnus-registry-track-extra))
145 (defun gnus-registry-cache-read ()
146 "Read the registry cache file."
148 (let ((file gnus-registry-cache-file))
149 (when (file-exists-p file)
150 (gnus-message 5 "Reading %s..." file)
152 (gnus-message 5 "Reading %s...done" file))))
154 (defun gnus-registry-cache-save ()
155 "Save the registry cache file."
157 (let ((file gnus-registry-cache-file))
159 (set-buffer (gnus-get-buffer-create " *Gnus-registry-cache*"))
160 (make-local-variable 'version-control)
161 (setq version-control gnus-backup-startup-file)
162 (setq buffer-file-name file)
163 (setq default-directory (file-name-directory buffer-file-name))
164 (buffer-disable-undo)
166 (gnus-message 5 "Saving %s..." file)
167 (if gnus-save-startup-file-via-temp-buffer
168 (let ((coding-system-for-write gnus-ding-file-coding-system)
169 (standard-output (current-buffer)))
170 (gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist)
171 (gnus-registry-cache-whitespace file)
173 (let ((coding-system-for-write gnus-ding-file-coding-system)
174 (version-control gnus-backup-startup-file)
176 (working-dir (file-name-directory file))
179 ;; Generate the name of a non-existent file.
180 (while (progn (setq working-file
182 (if (and (eq system-type 'ms-dos)
183 (not (gnus-long-file-names)))
184 "%s#%d.tm#" ; MSDOS limits files to 8+3
185 (if (memq system-type '(vax-vms axp-vms))
188 working-dir (setq i (1+ i))))
189 (file-exists-p working-file)))
193 (gnus-with-output-to-file working-file
194 (gnus-gnus-to-quick-newsrc-format t "gnus registry startup file" 'gnus-registry-alist))
196 ;; These bindings will mislead the current buffer
197 ;; into thinking that it is visiting the startup
199 (let ((buffer-backed-up nil)
200 (buffer-file-name startup-file)
201 (file-precious-flag t)
202 (setmodes (file-modes startup-file)))
203 ;; Backup the current version of the startup file.
206 ;; Replace the existing startup file with the temp file.
207 (rename-file working-file startup-file t)
208 (set-file-modes startup-file setmodes)))
210 (delete-file working-file)
213 (gnus-kill-buffer (current-buffer))
214 (gnus-message 5 "Saving %s...done" file))))
216 ;; Idea from Dan Christensen <jdc@chow.mat.jhu.edu>
217 ;; Save the gnus-registry file with extra line breaks.
218 (defun gnus-registry-cache-whitespace (filename)
219 (gnus-message 5 "Adding whitespace to %s" filename)
221 (goto-char (point-min))
222 (while (re-search-forward "^(\\|(\\\"" nil t)
223 (replace-match "\n\\&" t))
224 (goto-char (point-min))
225 (while (re-search-forward " $" nil t)
226 (replace-match "" t t))))
228 (defun gnus-registry-save (&optional force)
229 (when (or gnus-registry-dirty force)
230 (let ((caching gnus-registry-entry-caching))
231 ;; turn off entry caching, so mtime doesn't get recorded
232 (setq gnus-registry-entry-caching nil)
233 ;; remove entry caches
236 (if (hash-table-p value)
237 (remhash key gnus-registry-hashtb)))
238 gnus-registry-hashtb)
239 ;; remove empty entries
240 (when gnus-registry-clean-empty
241 (gnus-registry-clean-empty-function))
242 ;; now trim the registry appropriately
243 (setq gnus-registry-alist (gnus-registry-trim
244 (hashtable-to-alist gnus-registry-hashtb)))
246 (gnus-registry-cache-save)
247 (setq gnus-registry-entry-caching caching)
248 (setq gnus-registry-dirty nil))))
250 (defun gnus-registry-clean-empty-function ()
251 "Remove all empty entries from the registry. Returns count thereof."
255 (unless (gnus-registry-fetch-group key)
257 (remhash key gnus-registry-hashtb)))
258 gnus-registry-hashtb)
261 (defun gnus-registry-read ()
262 (gnus-registry-cache-read)
263 (setq gnus-registry-hashtb (alist-to-hashtable gnus-registry-alist))
264 (setq gnus-registry-dirty nil))
266 (defun gnus-registry-trim (alist)
267 "Trim alist to size, using gnus-registry-max-entries."
268 (if (null gnus-registry-max-entries)
269 alist ; just return the alist
270 ;; else, when given max-entries, trim the alist
271 (let ((timehash (make-hash-table
276 (puthash key (gnus-registry-fetch-extra key 'mtime) timehash))
277 gnus-registry-hashtb)
279 ;; we use the return value of this setq, which is the trimmed alist
282 (- (length alist) gnus-registry-max-entries)
286 (cdr (gethash (car a) timehash))
287 (cdr (gethash (car b) timehash))))))))))
289 (defun alist-to-hashtable (alist)
290 "Build a hashtable from the values in ALIST."
291 (let ((ht (make-hash-table
296 (puthash (car kv-pair) (cdr kv-pair) ht))
300 (defun hashtable-to-alist (hash)
301 "Build an alist from the values in HASH."
305 (setq list (cons (cons key value) list)))
309 (defun gnus-registry-action (action data-header from &optional to method)
310 (let* ((id (mail-header-id data-header))
311 (subject (gnus-registry-simplify-subject
312 (mail-header-subject data-header)))
313 (sender (mail-header-from data-header))
314 (from (gnus-group-guess-full-name-from-command-method from))
315 (to (if to (gnus-group-guess-full-name-from-command-method to) nil))
316 (to-name (if to to "the Bit Bucket"))
317 (old-entry (gethash id gnus-registry-hashtb)))
318 (gnus-message 5 "Registry: article %s %s from %s to %s"
320 (if method "respooling" "going")
324 ;; All except copy will need a delete
325 (gnus-registry-delete-group id from)
327 (when (equal 'copy action)
328 (gnus-registry-add-group id from subject sender)) ; undo the delete
330 (gnus-registry-add-group id to subject sender)))
332 (defun gnus-registry-spool-action (id group &optional subject sender)
333 (let ((group (gnus-group-guess-full-name-from-command-method group)))
334 (when (and (stringp id) (string-match "\r$" id))
335 (setq id (substring id 0 -1)))
336 (gnus-message 5 "Registry: article %s spooled to %s"
339 (gnus-registry-add-group id group subject sender)))
341 ;; Function for nn{mail|imap}-split-fancy: look up all references in
342 ;; the cache and if a match is found, return that group.
343 (defun gnus-registry-split-fancy-with-parent ()
344 "Split this message into the same group as its parent. The parent
345 is obtained from the registry. This function can be used as an entry
346 in `nnmail-split-fancy' or `nnimap-split-fancy', for example like
347 this: (: gnus-registry-split-fancy-with-parent)
349 For a message to be split, it looks for the parent message in the
350 References or In-Reply-To header and then looks in the registry to
351 see which group that message was put in. This group is returned.
353 See the Info node `(gnus)Fancy Mail Splitting' for more details."
354 (let ((refstr (or (message-fetch-field "references")
355 (message-fetch-field "in-reply-to")))
356 (nnmail-split-fancy-with-parent-ignore-groups
357 (if (listp nnmail-split-fancy-with-parent-ignore-groups)
358 nnmail-split-fancy-with-parent-ignore-groups
359 (list nnmail-split-fancy-with-parent-ignore-groups)))
363 (setq references (nreverse (gnus-split-references refstr)))
365 (setq res (or (gnus-registry-fetch-group x) res))
366 (when (or (gnus-registry-grep-in-list
368 gnus-registry-unfollowed-groups)
369 (gnus-registry-grep-in-list
371 nnmail-split-fancy-with-parent-ignore-groups))
375 ;; else: there were no references, now try the extra tracking
376 (let ((sender (message-fetch-field "from"))
377 (subject (gnus-registry-simplify-subject
378 (message-fetch-field "subject")))
380 (when (and single-match
381 (gnus-registry-track-sender-p)
385 (let ((this-sender (cdr
386 (gnus-registry-fetch-extra key 'sender))))
387 (when (and single-match
389 (equal sender this-sender))
390 ;; too many matches, bail
391 (unless (equal res (gnus-registry-fetch-group key))
392 (setq single-match nil))
393 (setq res (gnus-registry-fetch-group key))
395 ;; raise level of messaging if gnus-registry-track-extra
396 (if gnus-registry-track-extra 5 9)
397 "%s (extra tracking) traced sender %s to group %s"