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41487370 | 1 | ;;; gnus-cache.el --- cache interface for Gnus |
231f989b | 2 | ;; Copyright (C) 1995,96 Free Software Foundation, Inc. |
41487370 LMI |
3 | |
4 | ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no> | |
5 | ;; Keywords: news | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
41487370 LMI |
23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | (require 'gnus) | |
231f989b | 29 | (eval-when-compile (require 'cl)) |
41487370 | 30 | |
231f989b LMI |
31 | (defvar gnus-cache-directory |
32 | (nnheader-concat gnus-directory "cache/") | |
41487370 LMI |
33 | "*The directory where cached articles will be stored.") |
34 | ||
231f989b LMI |
35 | (defvar gnus-cache-active-file |
36 | (concat (file-name-as-directory gnus-cache-directory) "active") | |
37 | "*The cache active file.") | |
38 | ||
41487370 LMI |
39 | (defvar gnus-cache-enter-articles '(ticked dormant) |
40 | "*Classes of articles to enter into the cache.") | |
41 | ||
42 | (defvar gnus-cache-remove-articles '(read) | |
43 | "*Classes of articles to remove from the cache.") | |
44 | ||
231f989b LMI |
45 | (defvar gnus-uncacheable-groups nil |
46 | "*Groups that match this regexp will not be cached. | |
47 | ||
48 | If you want to avoid caching your nnml groups, you could set this | |
49 | variable to \"^nnml\".") | |
50 | ||
41487370 LMI |
51 | \f |
52 | ||
231f989b LMI |
53 | ;;; Internal variables. |
54 | ||
41487370 | 55 | (defvar gnus-cache-buffer nil) |
231f989b LMI |
56 | (defvar gnus-cache-active-hashtb nil) |
57 | (defvar gnus-cache-active-altered nil) | |
58 | ||
59 | (eval-and-compile | |
60 | (autoload 'nnml-generate-nov-databases-1 "nnml") | |
61 | (autoload 'nnvirtual-find-group-art "nnvirtual")) | |
41487370 LMI |
62 | |
63 | \f | |
64 | ||
231f989b | 65 | ;;; Functions called from Gnus. |
41487370 | 66 | |
231f989b LMI |
67 | (defun gnus-cache-open () |
68 | "Initialize the cache." | |
c4c7f54c LMI |
69 | (when (or (file-exists-p gnus-cache-directory) |
70 | (and gnus-use-cache | |
71 | (not (eq gnus-use-cache 'passive)))) | |
72 | (gnus-cache-read-active))) | |
231f989b LMI |
73 | |
74 | (gnus-add-shutdown 'gnus-cache-close 'gnus) | |
75 | ||
76 | (defun gnus-cache-close () | |
77 | "Shut down the cache." | |
78 | (gnus-cache-write-active) | |
79 | (gnus-cache-save-buffers) | |
80 | (setq gnus-cache-active-hashtb nil)) | |
41487370 LMI |
81 | |
82 | (defun gnus-cache-save-buffers () | |
83 | ;; save the overview buffer if it exists and has been modified | |
84 | ;; delete empty cache subdirectories | |
85 | (if (null gnus-cache-buffer) | |
86 | () | |
87 | (let ((buffer (cdr gnus-cache-buffer)) | |
88 | (overview-file (gnus-cache-file-name | |
89 | (car gnus-cache-buffer) ".overview"))) | |
90 | ;; write the overview only if it was modified | |
91 | (if (buffer-modified-p buffer) | |
92 | (save-excursion | |
93 | (set-buffer buffer) | |
94 | (if (> (buffer-size) 0) | |
95 | ;; non-empty overview, write it out | |
96 | (progn | |
97 | (gnus-make-directory (file-name-directory overview-file)) | |
98 | (write-region (point-min) (point-max) | |
99 | overview-file nil 'quietly)) | |
100 | ;; empty overview file, remove it | |
101 | (and (file-exists-p overview-file) | |
102 | (delete-file overview-file)) | |
103 | ;; if possible, remove group's cache subdirectory | |
104 | (condition-case nil | |
105 | ;; FIXME: we can detect the error type and warn the user | |
106 | ;; of any inconsistencies (articles w/o nov entries?). | |
107 | ;; for now, just be conservative...delete only if safe -- sj | |
108 | (delete-directory (file-name-directory overview-file)) | |
109 | (error nil))))) | |
110 | ;; kill the buffer, it's either unmodified or saved | |
111 | (gnus-kill-buffer buffer) | |
112 | (setq gnus-cache-buffer nil)))) | |
113 | ||
231f989b LMI |
114 | (defun gnus-cache-possibly-enter-article |
115 | (group article headers ticked dormant unread &optional force) | |
116 | (when (and (or force (not (eq gnus-use-cache 'passive))) | |
117 | (numberp article) | |
118 | (> article 0) | |
119 | (vectorp headers)) ; This might be a dummy article. | |
120 | ;; If this is a virtual group, we find the real group. | |
121 | (when (gnus-virtual-group-p group) | |
122 | (let ((result (nnvirtual-find-group-art | |
123 | (gnus-group-real-name group) article))) | |
124 | (setq group (car result) | |
125 | headers (copy-sequence headers)) | |
126 | (mail-header-set-number headers (cdr result)))) | |
127 | (let ((number (mail-header-number headers)) | |
128 | file dir) | |
129 | (when (and (> number 0) ; Reffed article. | |
130 | (or (not gnus-uncacheable-groups) | |
131 | (not (string-match gnus-uncacheable-groups group))) | |
132 | (or force | |
133 | (gnus-cache-member-of-class | |
134 | gnus-cache-enter-articles ticked dormant unread)) | |
135 | (not (file-exists-p (setq file (gnus-cache-file-name | |
136 | group number))))) | |
137 | ;; Possibly create the cache directory. | |
138 | (or (file-exists-p (setq dir (file-name-directory file))) | |
139 | (gnus-make-directory dir)) | |
140 | ;; Save the article in the cache. | |
141 | (if (file-exists-p file) | |
142 | t ; The article already is saved. | |
143 | (save-excursion | |
144 | (set-buffer nntp-server-buffer) | |
145 | (let ((gnus-use-cache nil)) | |
146 | (gnus-request-article-this-buffer number group)) | |
147 | (when (> (buffer-size) 0) | |
148 | (write-region (point-min) (point-max) file nil 'quiet) | |
149 | (gnus-cache-change-buffer group) | |
150 | (set-buffer (cdr gnus-cache-buffer)) | |
151 | (goto-char (point-max)) | |
152 | (forward-line -1) | |
153 | (while (condition-case () | |
154 | (and (not (bobp)) | |
155 | (> (read (current-buffer)) number)) | |
156 | (error | |
157 | ;; The line was malformed, so we just remove it!! | |
158 | (gnus-delete-line) | |
159 | t)) | |
160 | (forward-line -1)) | |
161 | (if (bobp) | |
162 | (if (not (eobp)) | |
163 | (progn | |
164 | (beginning-of-line) | |
165 | (if (< (read (current-buffer)) number) | |
166 | (forward-line 1))) | |
167 | (beginning-of-line)) | |
168 | (forward-line 1)) | |
169 | (beginning-of-line) | |
170 | ;; [number subject from date id references chars lines xref] | |
171 | (insert (format "%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t\n" | |
172 | (mail-header-number headers) | |
173 | (mail-header-subject headers) | |
174 | (mail-header-from headers) | |
175 | (mail-header-date headers) | |
176 | (mail-header-id headers) | |
177 | (or (mail-header-references headers) "") | |
178 | (or (mail-header-chars headers) "") | |
179 | (or (mail-header-lines headers) "") | |
180 | (or (mail-header-xref headers) ""))) | |
181 | ;; Update the active info. | |
182 | (set-buffer gnus-summary-buffer) | |
183 | (gnus-cache-update-active group number) | |
184 | (push article gnus-newsgroup-cached) | |
185 | (gnus-summary-update-secondary-mark article)) | |
186 | t)))))) | |
187 | ||
188 | (defun gnus-cache-enter-remove-article (article) | |
189 | "Mark ARTICLE for later possible removal." | |
190 | (when article | |
191 | (push article gnus-cache-removable-articles))) | |
192 | ||
193 | (defun gnus-cache-possibly-remove-articles () | |
194 | "Possibly remove some of the removable articles." | |
195 | (if (not (gnus-virtual-group-p gnus-newsgroup-name)) | |
196 | (gnus-cache-possibly-remove-articles-1) | |
197 | (let ((arts gnus-cache-removable-articles) | |
198 | ga) | |
199 | (while arts | |
200 | (when (setq ga (nnvirtual-find-group-art | |
201 | (gnus-group-real-name gnus-newsgroup-name) (pop arts))) | |
202 | (let ((gnus-cache-removable-articles (list (cdr ga))) | |
203 | (gnus-newsgroup-name (car ga))) | |
204 | (gnus-cache-possibly-remove-articles-1))))) | |
205 | (setq gnus-cache-removable-articles nil))) | |
206 | ||
207 | (defun gnus-cache-possibly-remove-articles-1 () | |
208 | "Possibly remove some of the removable articles." | |
209 | (unless (eq gnus-use-cache 'passive) | |
210 | (let ((articles gnus-cache-removable-articles) | |
211 | (cache-articles gnus-newsgroup-cached) | |
212 | article) | |
213 | (gnus-cache-change-buffer gnus-newsgroup-name) | |
214 | (while articles | |
215 | (if (memq (setq article (pop articles)) cache-articles) | |
216 | ;; The article was in the cache, so we see whether we are | |
217 | ;; supposed to remove it from the cache. | |
218 | (gnus-cache-possibly-remove-article | |
219 | article (memq article gnus-newsgroup-marked) | |
220 | (memq article gnus-newsgroup-dormant) | |
221 | (or (memq article gnus-newsgroup-unreads) | |
222 | (memq article gnus-newsgroup-unselected)))))) | |
223 | ;; The overview file might have been modified, save it | |
224 | ;; safe because we're only called at group exit anyway. | |
225 | (gnus-cache-save-buffers))) | |
226 | ||
227 | (defun gnus-cache-request-article (article group) | |
228 | "Retrieve ARTICLE in GROUP from the cache." | |
229 | (let ((file (gnus-cache-file-name group article)) | |
230 | (buffer-read-only nil)) | |
231 | (when (file-exists-p file) | |
232 | (erase-buffer) | |
233 | (gnus-kill-all-overlays) | |
234 | (insert-file-contents file) | |
235 | t))) | |
236 | ||
237 | (defun gnus-cache-possibly-alter-active (group active) | |
238 | "Alter the ACTIVE info for GROUP to reflect the articles in the cache." | |
239 | (let ((cache-active (gnus-gethash group gnus-cache-active-hashtb))) | |
240 | (and cache-active | |
241 | (< (car cache-active) (car active)) | |
242 | (setcar active (car cache-active))) | |
243 | (and cache-active | |
244 | (> (cdr cache-active) (cdr active)) | |
245 | (setcdr active (cdr cache-active))))) | |
246 | ||
247 | (defun gnus-cache-retrieve-headers (articles group &optional fetch-old) | |
248 | "Retrieve the headers for ARTICLES in GROUP." | |
249 | (let ((cached | |
250 | (setq gnus-newsgroup-cached (gnus-cache-articles-in-group group)))) | |
251 | (if (not cached) | |
252 | ;; No cached articles here, so we just retrieve them | |
253 | ;; the normal way. | |
254 | (let ((gnus-use-cache nil)) | |
255 | (gnus-retrieve-headers articles group fetch-old)) | |
256 | (let ((uncached-articles (gnus-sorted-intersection | |
257 | (gnus-sorted-complement articles cached) | |
258 | articles)) | |
259 | (cache-file (gnus-cache-file-name group ".overview")) | |
260 | type) | |
261 | ;; We first retrieve all the headers that we don't have in | |
262 | ;; the cache. | |
263 | (let ((gnus-use-cache nil)) | |
264 | (when uncached-articles | |
265 | (setq type (and articles | |
266 | (gnus-retrieve-headers | |
267 | uncached-articles group fetch-old))))) | |
268 | (gnus-cache-save-buffers) | |
269 | ;; Then we insert the cached headers. | |
270 | (save-excursion | |
271 | (cond | |
272 | ((not (file-exists-p cache-file)) | |
273 | ;; There are no cached headers. | |
274 | type) | |
275 | ((null type) | |
276 | ;; There were no uncached headers (or retrieval was | |
277 | ;; unsuccessful), so we use the cached headers exclusively. | |
278 | (set-buffer nntp-server-buffer) | |
279 | (erase-buffer) | |
280 | (insert-file-contents cache-file) | |
281 | 'nov) | |
282 | ((eq type 'nov) | |
283 | ;; We have both cached and uncached NOV headers, so we | |
284 | ;; braid them. | |
285 | (gnus-cache-braid-nov group cached) | |
286 | type) | |
287 | (t | |
288 | ;; We braid HEADs. | |
289 | (gnus-cache-braid-heads group (gnus-sorted-intersection | |
290 | cached articles)) | |
291 | type))))))) | |
292 | ||
293 | (defun gnus-cache-enter-article (&optional n) | |
294 | "Enter the next N articles into the cache. | |
295 | If not given a prefix, use the process marked articles instead. | |
296 | Returns the list of articles entered." | |
297 | (interactive "P") | |
298 | (gnus-set-global-variables) | |
299 | (let ((articles (gnus-summary-work-articles n)) | |
300 | article out) | |
301 | (while articles | |
302 | (setq article (pop articles)) | |
303 | (when (gnus-cache-possibly-enter-article | |
304 | gnus-newsgroup-name article (gnus-summary-article-header article) | |
305 | nil nil nil t) | |
306 | (push article out)) | |
307 | (gnus-summary-remove-process-mark article) | |
308 | (gnus-summary-update-secondary-mark article)) | |
309 | (gnus-summary-next-subject 1) | |
310 | (gnus-summary-position-point) | |
311 | (nreverse out))) | |
312 | ||
313 | (defun gnus-cache-remove-article (n) | |
314 | "Remove the next N articles from the cache. | |
315 | If not given a prefix, use the process marked articles instead. | |
316 | Returns the list of articles removed." | |
317 | (interactive "P") | |
318 | (gnus-set-global-variables) | |
319 | (gnus-cache-change-buffer gnus-newsgroup-name) | |
320 | (let ((articles (gnus-summary-work-articles n)) | |
321 | article out) | |
322 | (while articles | |
323 | (setq article (pop articles)) | |
324 | (when (gnus-cache-possibly-remove-article article nil nil nil t) | |
325 | (push article out)) | |
326 | (gnus-summary-remove-process-mark article) | |
327 | (gnus-summary-update-secondary-mark article)) | |
328 | (gnus-summary-next-subject 1) | |
329 | (gnus-summary-position-point) | |
330 | (nreverse out))) | |
331 | ||
332 | (defun gnus-cached-article-p (article) | |
333 | "Say whether ARTICLE is cached in the current group." | |
334 | (memq article gnus-newsgroup-cached)) | |
335 | ||
336 | ;;; Internal functions. | |
337 | ||
338 | (defun gnus-cache-change-buffer (group) | |
339 | (and gnus-cache-buffer | |
340 | ;; See if the current group's overview cache has been loaded. | |
341 | (or (string= group (car gnus-cache-buffer)) | |
342 | ;; Another overview cache is current, save it. | |
343 | (gnus-cache-save-buffers))) | |
344 | ;; if gnus-cache buffer is nil, create it | |
345 | (or gnus-cache-buffer | |
346 | ;; Create cache buffer | |
347 | (save-excursion | |
348 | (setq gnus-cache-buffer | |
349 | (cons group | |
350 | (set-buffer (get-buffer-create " *gnus-cache-overview*")))) | |
351 | (buffer-disable-undo (current-buffer)) | |
352 | ;; Insert the contents of this group's cache overview. | |
353 | (erase-buffer) | |
354 | (let ((file (gnus-cache-file-name group ".overview"))) | |
355 | (and (file-exists-p file) | |
356 | (insert-file-contents file))) | |
357 | ;; We have a fresh (empty/just loaded) buffer, | |
358 | ;; mark it as unmodified to save a redundant write later. | |
359 | (set-buffer-modified-p nil)))) | |
41487370 LMI |
360 | |
361 | ;; Return whether an article is a member of a class. | |
362 | (defun gnus-cache-member-of-class (class ticked dormant unread) | |
363 | (or (and ticked (memq 'ticked class)) | |
364 | (and dormant (memq 'dormant class)) | |
365 | (and unread (memq 'unread class)) | |
231f989b | 366 | (and (not unread) (not ticked) (not dormant) (memq 'read class)))) |
41487370 LMI |
367 | |
368 | (defun gnus-cache-file-name (group article) | |
369 | (concat (file-name-as-directory gnus-cache-directory) | |
231f989b LMI |
370 | (file-name-as-directory |
371 | (if (gnus-use-long-file-name 'not-cache) | |
372 | group | |
373 | (let ((group (concat group ""))) | |
374 | (if (string-match ":" group) | |
375 | (aset group (match-beginning 0) ?/)) | |
376 | (nnheader-replace-chars-in-string group ?. ?/)))) | |
377 | (if (stringp article) article (int-to-string article)))) | |
378 | ||
379 | (defun gnus-cache-update-article (group article) | |
380 | "If ARTICLE is in the cache, remove it and re-enter it." | |
381 | (when (gnus-cache-possibly-remove-article article nil nil nil t) | |
382 | (let ((gnus-use-cache nil)) | |
383 | (gnus-cache-possibly-enter-article | |
384 | gnus-newsgroup-name article (gnus-summary-article-header article) | |
385 | nil nil nil t)))) | |
386 | ||
387 | (defun gnus-cache-possibly-remove-article (article ticked dormant unread | |
388 | &optional force) | |
389 | "Possibly remove ARTICLE from the cache." | |
390 | (let ((group gnus-newsgroup-name) | |
391 | (number article) | |
392 | file) | |
393 | ;; If this is a virtual group, we find the real group. | |
394 | (when (gnus-virtual-group-p group) | |
395 | (let ((result (nnvirtual-find-group-art | |
396 | (gnus-group-real-name group) article))) | |
397 | (setq group (car result) | |
398 | number (cdr result)))) | |
399 | (setq file (gnus-cache-file-name group number)) | |
400 | (when (and (file-exists-p file) | |
401 | (or force | |
402 | (gnus-cache-member-of-class | |
403 | gnus-cache-remove-articles ticked dormant unread))) | |
41487370 LMI |
404 | (save-excursion |
405 | (delete-file file) | |
406 | (set-buffer (cdr gnus-cache-buffer)) | |
407 | (goto-char (point-min)) | |
231f989b LMI |
408 | (if (or (looking-at (concat (int-to-string number) "\t")) |
409 | (search-forward (concat "\n" (int-to-string number) "\t") | |
41487370 LMI |
410 | (point-max) t)) |
411 | (delete-region (progn (beginning-of-line) (point)) | |
231f989b LMI |
412 | (progn (forward-line 1) (point))))) |
413 | (setq gnus-newsgroup-cached | |
414 | (delq article gnus-newsgroup-cached)) | |
415 | (gnus-summary-update-secondary-mark article) | |
41487370 LMI |
416 | t))) |
417 | ||
418 | (defun gnus-cache-articles-in-group (group) | |
231f989b | 419 | "Return a sorted list of cached articles in GROUP." |
41487370 LMI |
420 | (let ((dir (file-name-directory (gnus-cache-file-name group 1))) |
421 | articles) | |
231f989b LMI |
422 | (when (file-exists-p dir) |
423 | (sort (mapcar (lambda (name) (string-to-int name)) | |
424 | (directory-files dir nil "^[0-9]+$" t)) | |
425 | '<)))) | |
41487370 LMI |
426 | |
427 | (defun gnus-cache-braid-nov (group cached) | |
428 | (let ((cache-buf (get-buffer-create " *gnus-cache*")) | |
429 | beg end) | |
430 | (gnus-cache-save-buffers) | |
431 | (save-excursion | |
432 | (set-buffer cache-buf) | |
433 | (buffer-disable-undo (current-buffer)) | |
434 | (erase-buffer) | |
435 | (insert-file-contents (gnus-cache-file-name group ".overview")) | |
436 | (goto-char (point-min)) | |
437 | (insert "\n") | |
438 | (goto-char (point-min))) | |
439 | (set-buffer nntp-server-buffer) | |
440 | (goto-char (point-min)) | |
441 | (while cached | |
442 | (while (and (not (eobp)) | |
443 | (< (read (current-buffer)) (car cached))) | |
444 | (forward-line 1)) | |
445 | (beginning-of-line) | |
446 | (save-excursion | |
447 | (set-buffer cache-buf) | |
448 | (if (search-forward (concat "\n" (int-to-string (car cached)) "\t") | |
449 | nil t) | |
450 | (setq beg (progn (beginning-of-line) (point)) | |
451 | end (progn (end-of-line) (point))) | |
452 | (setq beg nil))) | |
453 | (if beg (progn (insert-buffer-substring cache-buf beg end) | |
454 | (insert "\n"))) | |
455 | (setq cached (cdr cached))) | |
456 | (kill-buffer cache-buf))) | |
457 | ||
458 | (defun gnus-cache-braid-heads (group cached) | |
459 | (let ((cache-buf (get-buffer-create " *gnus-cache*"))) | |
460 | (save-excursion | |
461 | (set-buffer cache-buf) | |
462 | (buffer-disable-undo (current-buffer)) | |
463 | (erase-buffer)) | |
464 | (set-buffer nntp-server-buffer) | |
465 | (goto-char (point-min)) | |
466 | (while cached | |
467 | (while (and (not (eobp)) | |
468 | (looking-at "2.. +\\([0-9]+\\) ") | |
469 | (< (progn (goto-char (match-beginning 1)) | |
470 | (read (current-buffer))) | |
471 | (car cached))) | |
472 | (search-forward "\n.\n" nil 'move)) | |
473 | (beginning-of-line) | |
474 | (save-excursion | |
475 | (set-buffer cache-buf) | |
476 | (erase-buffer) | |
477 | (insert-file-contents (gnus-cache-file-name group (car cached))) | |
478 | (goto-char (point-min)) | |
231f989b LMI |
479 | (insert "220 ") |
480 | (princ (car cached) (current-buffer)) | |
481 | (insert " Article retrieved.\n") | |
41487370 LMI |
482 | (search-forward "\n\n" nil 'move) |
483 | (delete-region (point) (point-max)) | |
484 | (forward-char -1) | |
485 | (insert ".")) | |
486 | (insert-buffer-substring cache-buf) | |
487 | (setq cached (cdr cached))) | |
488 | (kill-buffer cache-buf))) | |
489 | ||
231f989b | 490 | ;;;###autoload |
41487370 LMI |
491 | (defun gnus-jog-cache () |
492 | "Go through all groups and put the articles into the cache." | |
493 | (interactive) | |
231f989b | 494 | (let ((gnus-mark-article-hook nil) |
41487370 | 495 | (gnus-expert-user t) |
231f989b LMI |
496 | (nnmail-spool-file nil) |
497 | (gnus-use-dribble-file nil) | |
498 | (gnus-novice-user nil) | |
41487370 | 499 | (gnus-large-newsgroup nil)) |
231f989b LMI |
500 | ;; Start Gnus. |
501 | (gnus) | |
502 | ;; Go through all groups... | |
503 | (gnus-group-mark-buffer) | |
504 | (gnus-group-universal-argument | |
505 | nil nil | |
506 | (lambda () | |
507 | (gnus-summary-read-group nil nil t) | |
508 | ;; ... and enter the articles into the cache. | |
509 | (when (eq major-mode 'gnus-summary-mode) | |
510 | (gnus-uu-mark-buffer) | |
511 | (gnus-cache-enter-article) | |
512 | (kill-buffer (current-buffer))))))) | |
513 | ||
514 | (defun gnus-cache-read-active (&optional force) | |
515 | "Read the cache active file." | |
516 | (unless (file-exists-p gnus-cache-directory) | |
517 | (make-directory gnus-cache-directory t)) | |
518 | (if (not (and (file-exists-p gnus-cache-active-file) | |
519 | (or force (not gnus-cache-active-hashtb)))) | |
520 | ;; There is no active file, so we generate one. | |
521 | (gnus-cache-generate-active) | |
522 | ;; We simply read the active file. | |
523 | (save-excursion | |
524 | (gnus-set-work-buffer) | |
525 | (insert-file-contents gnus-cache-active-file) | |
526 | (gnus-active-to-gnus-format | |
527 | nil (setq gnus-cache-active-hashtb | |
528 | (gnus-make-hashtable | |
529 | (count-lines (point-min) (point-max))))) | |
530 | (setq gnus-cache-active-altered nil)))) | |
531 | ||
532 | (defun gnus-cache-write-active (&optional force) | |
533 | "Write the active hashtb to the active file." | |
534 | (when (or force | |
535 | (and gnus-cache-active-hashtb | |
536 | gnus-cache-active-altered)) | |
537 | (save-excursion | |
538 | (gnus-set-work-buffer) | |
539 | (mapatoms | |
540 | (lambda (sym) | |
541 | (when (and sym (boundp sym)) | |
542 | (insert (format "%s %d %d y\n" | |
543 | (symbol-name sym) (cdr (symbol-value sym)) | |
544 | (car (symbol-value sym)))))) | |
545 | gnus-cache-active-hashtb) | |
546 | (gnus-make-directory (file-name-directory gnus-cache-active-file)) | |
547 | (write-region | |
548 | (point-min) (point-max) gnus-cache-active-file nil 'silent)) | |
549 | ;; Mark the active hashtb as unaltered. | |
550 | (setq gnus-cache-active-altered nil))) | |
551 | ||
552 | (defun gnus-cache-update-active (group number &optional low) | |
553 | "Update the upper bound of the active info of GROUP to NUMBER. | |
554 | If LOW, update the lower bound instead." | |
555 | (let ((active (gnus-gethash group gnus-cache-active-hashtb))) | |
556 | (if (null active) | |
557 | ;; We just create a new active entry for this group. | |
558 | (gnus-sethash group (cons number number) gnus-cache-active-hashtb) | |
559 | ;; Update the lower or upper bound. | |
560 | (if low | |
561 | (setcar active number) | |
562 | (setcdr active number)) | |
563 | ;; Mark the active hashtb as altered. | |
564 | (setq gnus-cache-active-altered t)))) | |
565 | ||
566 | ;;;###autoload | |
567 | (defun gnus-cache-generate-active (&optional directory) | |
568 | "Generate the cache active file." | |
569 | (interactive) | |
570 | (let* ((top (null directory)) | |
571 | (directory (expand-file-name (or directory gnus-cache-directory))) | |
572 | (files (directory-files directory 'full)) | |
573 | (group | |
574 | (if top | |
575 | "" | |
576 | (string-match | |
577 | (concat "^" (file-name-as-directory | |
578 | (expand-file-name gnus-cache-directory))) | |
579 | (directory-file-name directory)) | |
580 | (nnheader-replace-chars-in-string | |
581 | (substring (directory-file-name directory) (match-end 0)) | |
582 | ?/ ?.))) | |
583 | nums alphs) | |
584 | (when top | |
585 | (gnus-message 5 "Generating the cache active file...") | |
586 | (setq gnus-cache-active-hashtb (gnus-make-hashtable 123))) | |
587 | ;; Separate articles from all other files and directories. | |
588 | (while files | |
589 | (if (string-match "^[0-9]+$" (file-name-nondirectory (car files))) | |
590 | (push (string-to-int (file-name-nondirectory (pop files))) nums) | |
591 | (push (pop files) alphs))) | |
592 | ;; If we have nums, then this is probably a valid group. | |
593 | (when (setq nums (sort nums '<)) | |
594 | (gnus-sethash group (cons (car nums) (gnus-last-element nums)) | |
595 | gnus-cache-active-hashtb)) | |
596 | ;; Go through all the other files. | |
597 | (while alphs | |
598 | (when (and (file-directory-p (car alphs)) | |
599 | (not (string-match "^\\.\\.?$" | |
600 | (file-name-nondirectory (car alphs))))) | |
601 | ;; We descend directories. | |
602 | (gnus-cache-generate-active (car alphs))) | |
603 | (setq alphs (cdr alphs))) | |
604 | ;; Write the new active file. | |
605 | (when top | |
606 | (gnus-cache-write-active t) | |
607 | (gnus-message 5 "Generating the cache active file...done")))) | |
608 | ||
609 | ;;;###autoload | |
610 | (defun gnus-cache-generate-nov-databases (dir) | |
611 | "Generate NOV files recursively starting in DIR." | |
612 | (interactive (list gnus-cache-directory)) | |
613 | (gnus-cache-close) | |
614 | (let ((nnml-generate-active-function 'identity)) | |
615 | (nnml-generate-nov-databases-1 dir))) | |
41487370 LMI |
616 | |
617 | (provide 'gnus-cache) | |
618 | ||
619 | ;;; gnus-cache.el ends here |