1 ;;; gnus-agent.el --- unplugged support for Gnus
2 ;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
3 ;; Free Software Foundation, Inc.
5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
6 ;; This file is part of GNU Emacs.
8 ;; GNU Emacs is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; GNU Emacs is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GNU Emacs; see the file COPYING. If not, write to the
20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 ;; Boston, MA 02111-1307, USA.
34 (if (featurep 'xemacs)
40 (autoload 'gnus-server-update-server "gnus-srvr"))
42 (defcustom gnus-agent-directory (nnheader-concat gnus-directory "agent/")
43 "Where the Gnus agent will store its files."
47 (defcustom gnus-agent-plugged-hook nil
48 "Hook run when plugging into the network."
52 (defcustom gnus-agent-unplugged-hook nil
53 "Hook run when unplugging from the network."
57 (defcustom gnus-agent-handle-level gnus-level-subscribed
58 "Groups on levels higher than this variable will be ignored by the Agent."
62 (defcustom gnus-agent-expire-days 7
63 "Read articles older than this will be expired.
64 This can also be a list of regexp/day pairs. The regexps will
65 be matched against group names."
69 (defcustom gnus-agent-expire-all nil
70 "If non-nil, also expire unread, ticked and dormant articles.
71 If nil, only read articles will be expired."
75 (defcustom gnus-agent-group-mode-hook nil
76 "Hook run in Agent group minor modes."
80 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
81 (when (featurep 'xemacs)
82 (add-hook 'gnus-agent-group-mode-hook 'gnus-xmas-agent-group-menu-add))
84 (defcustom gnus-agent-summary-mode-hook nil
85 "Hook run in Agent summary minor modes."
89 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
90 (when (featurep 'xemacs)
91 (add-hook 'gnus-agent-summary-mode-hook 'gnus-xmas-agent-summary-menu-add))
93 (defcustom gnus-agent-server-mode-hook nil
94 "Hook run in Agent summary minor modes."
98 ;; Extracted from gnus-xmas-redefine in order to preserve user settings
99 (when (featurep 'xemacs)
100 (add-hook 'gnus-agent-server-mode-hook 'gnus-xmas-agent-server-menu-add))
102 (defcustom gnus-agent-confirmation-function 'y-or-n-p
103 "Function to confirm when error happens."
108 (defcustom gnus-agent-synchronize-flags 'ask
109 "Indicate if flags are synchronized when you plug in.
110 If this is `ask' the hook will query the user."
112 :type '(choice (const :tag "Always" t)
113 (const :tag "Never" nil)
114 (const :tag "Ask" ask))
117 (defcustom gnus-agent-go-online 'ask
118 "Indicate if offline servers go online when you plug in.
119 If this is `ask' the hook will query the user."
121 :type '(choice (const :tag "Always" t)
122 (const :tag "Never" nil)
123 (const :tag "Ask" ask))
126 (defcustom gnus-agent-mark-unread-after-downloaded t
127 "Indicate whether to mark articles unread after downloaded."
132 (defcustom gnus-agent-download-marks '(download)
133 "Marks for downloading."
135 :type '(repeat (symbol :tag "Mark"))
138 (defcustom gnus-agent-consider-all-articles nil
139 "If non-nil, consider also the read articles for downloading."
144 (defcustom gnus-agent-max-fetch-size 10000000 ;; 10 Mb
145 "gnus-agent-fetch-session is required to split its article fetches into chunks smaller than this limit."
149 ;;; Internal variables
151 (defvar gnus-agent-history-buffers nil)
152 (defvar gnus-agent-buffer-alist nil)
153 (defvar gnus-agent-article-alist nil
154 "An assoc list identifying the articles whose headers have been fetched.
155 If successfully fetched, these headers will be stored in the group's overview file.
156 The key of each assoc pair is the article ID.
157 The value of each assoc pair is a flag indicating
158 whether the identified article has been downloaded (gnus-agent-fetch-articles
159 sets the value to the day of the download).
161 1) The last element of this list can not be expired as some
162 routines (for example, get-agent-fetch-headers) use the last
163 value to track which articles have had their headers retrieved.
164 2) The gnus-agent-regenerate may destructively modify the value.
166 (defvar gnus-agent-group-alist nil)
167 (defvar gnus-category-alist nil)
168 (defvar gnus-agent-current-history nil)
169 (defvar gnus-agent-overview-buffer nil)
170 (defvar gnus-category-predicate-cache nil)
171 (defvar gnus-category-group-cache nil)
172 (defvar gnus-agent-spam-hashtb nil)
173 (defvar gnus-agent-file-name nil)
174 (defvar gnus-agent-send-mail-function nil)
175 (defvar gnus-agent-file-coding-system 'raw-text)
176 (defvar gnus-agent-file-loading-cache nil)
177 (defvar gnus-agent-file-header-cache nil)
179 (defvar gnus-agent-auto-agentize-methods '(nntp nnimap)
180 "Initially, all servers from these methods are agentized.
181 The user may remove or add servers using the Server buffer. See Info
182 node `(gnus)Server Buffer'.")
185 (defvar gnus-headers)
192 (defun gnus-open-agent ()
194 (gnus-agent-read-servers)
196 (gnus-agent-create-buffer)
197 (add-hook 'gnus-group-mode-hook 'gnus-agent-mode)
198 (add-hook 'gnus-summary-mode-hook 'gnus-agent-mode)
199 (add-hook 'gnus-server-mode-hook 'gnus-agent-mode))
201 (defun gnus-agent-create-buffer ()
202 (if (gnus-buffer-live-p gnus-agent-overview-buffer)
204 (setq gnus-agent-overview-buffer
205 (gnus-get-buffer-create " *Gnus agent overview*"))
206 (with-current-buffer gnus-agent-overview-buffer
207 (mm-enable-multibyte))
210 (gnus-add-shutdown 'gnus-close-agent 'gnus)
212 (defun gnus-close-agent ()
213 (setq gnus-category-predicate-cache nil
214 gnus-category-group-cache nil
215 gnus-agent-spam-hashtb nil)
216 (gnus-kill-buffer gnus-agent-overview-buffer))
219 ;;; Utility functions
222 (defun gnus-agent-read-file (file)
223 "Load FILE and do a `read' there."
226 (nnheader-insert-file-contents file)
227 (goto-char (point-min))
228 (read (current-buffer)))))
230 (defsubst gnus-agent-method ()
231 (concat (symbol-name (car gnus-command-method)) "/"
232 (if (equal (cadr gnus-command-method) "")
234 (cadr gnus-command-method))))
236 (defsubst gnus-agent-directory ()
237 "Path of the Gnus agent directory."
238 (nnheader-concat gnus-agent-directory
239 (nnheader-translate-file-chars (gnus-agent-method)) "/"))
241 (defun gnus-agent-lib-file (file)
242 "The full path of the Gnus agent library FILE."
243 (expand-file-name file
244 (file-name-as-directory
245 (expand-file-name "agent.lib" (gnus-agent-directory)))))
247 ;;; Fetching setup functions.
249 (defun gnus-agent-start-fetch ()
250 "Initialize data structures for efficient fetching."
251 (gnus-agent-create-buffer))
253 (defun gnus-agent-stop-fetch ()
254 "Save all data structures and clean up."
255 (setq gnus-agent-spam-hashtb nil)
257 (set-buffer nntp-server-buffer)
260 (defmacro gnus-agent-with-fetch (&rest forms)
263 (let ((gnus-agent-fetching t))
264 (gnus-agent-start-fetch)
266 (gnus-agent-stop-fetch)))
268 (put 'gnus-agent-with-fetch 'lisp-indent-function 0)
269 (put 'gnus-agent-with-fetch 'edebug-form-spec '(body))
271 (defmacro gnus-agent-append-to-list (tail value)
272 `(setq ,tail (setcdr ,tail (cons ,value nil))))
278 (defvar gnus-agent-mode-hook nil
279 "Hook run when installing agent mode.")
281 (defvar gnus-agent-mode nil)
282 (defvar gnus-agent-mode-status '(gnus-agent-mode " Plugged"))
284 (defun gnus-agent-mode ()
285 "Minor mode for providing a agent support in Gnus buffers."
286 (let* ((buffer (progn (string-match "^gnus-\\(.*\\)-mode$"
287 (symbol-name major-mode))
288 (match-string 1 (symbol-name major-mode))))
289 (mode (intern (format "gnus-agent-%s-mode" buffer))))
290 (set (make-local-variable 'gnus-agent-mode) t)
292 (set (make-local-variable mode) t)
294 (when (gnus-visual-p 'agent-menu 'menu)
295 (funcall (intern (format "gnus-agent-%s-make-menu-bar" buffer))))
296 (unless (assq 'gnus-agent-mode minor-mode-alist)
297 (push gnus-agent-mode-status minor-mode-alist))
298 (unless (assq mode minor-mode-map-alist)
299 (push (cons mode (symbol-value (intern (format "gnus-agent-%s-mode-map"
301 minor-mode-map-alist))
302 (when (eq major-mode 'gnus-group-mode)
303 (gnus-agent-toggle-plugged gnus-plugged))
304 (gnus-run-hooks 'gnus-agent-mode-hook
305 (intern (format "gnus-agent-%s-mode-hook" buffer)))))
307 (defvar gnus-agent-group-mode-map (make-sparse-keymap))
308 (gnus-define-keys gnus-agent-group-mode-map
309 "Ju" gnus-agent-fetch-groups
310 "Jc" gnus-enter-category-buffer
311 "Jj" gnus-agent-toggle-plugged
312 "Js" gnus-agent-fetch-session
313 "JY" gnus-agent-synchronize-flags
314 "JS" gnus-group-send-queue
315 "Ja" gnus-agent-add-group
316 "Jr" gnus-agent-remove-group
317 "Jo" gnus-agent-toggle-group-plugged)
319 (defun gnus-agent-group-make-menu-bar ()
320 (unless (boundp 'gnus-agent-group-menu)
322 gnus-agent-group-menu gnus-agent-group-mode-map ""
324 ["Toggle plugged" gnus-agent-toggle-plugged t]
325 ["Toggle group plugged" gnus-agent-toggle-group-plugged t]
326 ["List categories" gnus-enter-category-buffer t]
327 ["Send queue" gnus-group-send-queue gnus-plugged]
329 ["All" gnus-agent-fetch-session gnus-plugged]
330 ["Group" gnus-agent-fetch-group gnus-plugged])))))
332 (defvar gnus-agent-summary-mode-map (make-sparse-keymap))
333 (gnus-define-keys gnus-agent-summary-mode-map
334 "Jj" gnus-agent-toggle-plugged
335 "Ju" gnus-agent-summary-fetch-group
336 "JS" gnus-agent-fetch-group
337 "Js" gnus-agent-summary-fetch-series
338 "J#" gnus-agent-mark-article
339 "J\M-#" gnus-agent-unmark-article
340 "@" gnus-agent-toggle-mark
341 "Jc" gnus-agent-catchup)
343 (defun gnus-agent-summary-make-menu-bar ()
344 (unless (boundp 'gnus-agent-summary-menu)
346 gnus-agent-summary-menu gnus-agent-summary-mode-map ""
348 ["Toggle plugged" gnus-agent-toggle-plugged t]
349 ["Mark as downloadable" gnus-agent-mark-article t]
350 ["Unmark as downloadable" gnus-agent-unmark-article t]
351 ["Toggle mark" gnus-agent-toggle-mark t]
352 ["Fetch downloadable" gnus-agent-summary-fetch-group t]
353 ["Catchup undownloaded" gnus-agent-catchup t]))))
355 (defvar gnus-agent-server-mode-map (make-sparse-keymap))
356 (gnus-define-keys gnus-agent-server-mode-map
357 "Jj" gnus-agent-toggle-plugged
358 "Ja" gnus-agent-add-server
359 "Jr" gnus-agent-remove-server)
361 (defun gnus-agent-server-make-menu-bar ()
362 (unless (boundp 'gnus-agent-server-menu)
364 gnus-agent-server-menu gnus-agent-server-mode-map ""
366 ["Toggle plugged" gnus-agent-toggle-plugged t]
367 ["Add" gnus-agent-add-server t]
368 ["Remove" gnus-agent-remove-server t]))))
370 (defun gnus-agent-make-mode-line-string (string mouse-button mouse-func)
371 (if (and (fboundp 'propertize)
372 (fboundp 'make-mode-line-mouse-map))
373 (propertize string 'local-map
374 (make-mode-line-mouse-map mouse-button mouse-func))
377 (defun gnus-agent-toggle-plugged (plugged)
378 "Toggle whether Gnus is unplugged or not."
379 (interactive (list (not gnus-plugged)))
382 (setq gnus-plugged plugged)
383 (gnus-run-hooks 'gnus-agent-plugged-hook)
384 (setcar (cdr gnus-agent-mode-status)
385 (gnus-agent-make-mode-line-string " Plugged"
387 'gnus-agent-toggle-plugged))
388 (gnus-agent-go-online gnus-agent-go-online)
389 (gnus-agent-possibly-synchronize-flags))
390 (gnus-agent-close-connections)
391 (setq gnus-plugged plugged)
392 (gnus-run-hooks 'gnus-agent-unplugged-hook)
393 (setcar (cdr gnus-agent-mode-status)
394 (gnus-agent-make-mode-line-string " Unplugged"
396 'gnus-agent-toggle-plugged)))
397 (set-buffer-modified-p t))
399 (defun gnus-agent-close-connections ()
400 "Close all methods covered by the Gnus agent."
401 (let ((methods gnus-agent-covered-methods))
403 (gnus-close-server (pop methods)))))
406 (defun gnus-unplugged ()
407 "Start Gnus unplugged."
409 (setq gnus-plugged nil)
413 (defun gnus-plugged ()
414 "Start Gnus plugged."
416 (setq gnus-plugged t)
420 (defun gnus-slave-unplugged (&optional arg)
421 "Read news as a slave unplugged."
423 (setq gnus-plugged nil)
424 (gnus arg nil 'slave))
427 (defun gnus-agentize ()
428 "Allow Gnus to be an offline newsreader.
429 The normal usage of this command is to put the following as the
430 last form in your `.gnus.el' file:
434 This will modify the `gnus-setup-news-hook', and
435 `message-send-mail-real-function' variables, and install the Gnus agent
436 minor mode in all Gnus buffers."
439 (add-hook 'gnus-setup-news-hook 'gnus-agent-queue-setup)
440 (unless gnus-agent-send-mail-function
441 (setq gnus-agent-send-mail-function (or
442 message-send-mail-real-function
443 message-send-mail-function)
444 message-send-mail-real-function 'gnus-agent-send-mail))
445 (unless gnus-agent-covered-methods
448 (if (memq (car (gnus-server-to-method server))
449 gnus-agent-auto-agentize-methods)
450 (setq gnus-agent-covered-methods
451 (cons (gnus-server-to-method server)
452 gnus-agent-covered-methods ))))
453 (append (list gnus-select-method) gnus-secondary-select-methods))))
455 (defun gnus-agent-queue-setup ()
456 "Make sure the queue group exists."
457 (unless (gnus-gethash "nndraft:queue" gnus-newsrc-hashtb)
458 (gnus-request-create-group "queue" '(nndraft ""))
459 (let ((gnus-level-default-subscribed 1))
460 (gnus-subscribe-group "nndraft:queue" nil '(nndraft "")))
461 (gnus-group-set-parameter
462 "nndraft:queue" 'gnus-dummy '((gnus-draft-mode)))))
464 (defun gnus-agent-send-mail ()
466 (funcall gnus-agent-send-mail-function)
467 (goto-char (point-min))
469 (concat "^" (regexp-quote mail-header-separator) "\n"))
471 (gnus-agent-insert-meta-information 'mail)
472 (gnus-request-accept-article "nndraft:queue" nil t t)))
474 (defun gnus-agent-insert-meta-information (type &optional method)
475 "Insert meta-information into the message that says how it's to be posted.
476 TYPE can be either `mail' or `news'. If the latter, then METHOD can
479 (message-remove-header gnus-agent-meta-information-header)
480 (goto-char (point-min))
481 (insert gnus-agent-meta-information-header ": "
482 (symbol-name type) " " (format "%S" method)
485 (while (search-backward "\n" nil t)
486 (replace-match "\\n" t t))))
488 (defun gnus-agent-restore-gcc ()
489 "Restore GCC field from saved header."
491 (goto-char (point-min))
492 (while (re-search-forward (concat gnus-agent-gcc-header ":") nil t)
493 (replace-match "Gcc:" 'fixedcase))))
495 (defun gnus-agent-any-covered-gcc ()
497 (message-narrow-to-headers)
498 (let* ((gcc (mail-fetch-field "gcc" nil t))
500 (mapcar 'gnus-inews-group-method
501 (message-unquote-tokens
502 (message-tokenize-header
505 (while (and (not covered) methods)
506 (setq covered (gnus-agent-method-p (car methods))
507 methods (cdr methods)))
511 (defun gnus-agent-possibly-save-gcc ()
512 "Save GCC if Gnus is unplugged."
513 (when (and (not gnus-plugged) (gnus-agent-any-covered-gcc))
515 (goto-char (point-min))
516 (let ((case-fold-search t))
517 (while (re-search-forward "^gcc:" nil t)
518 (replace-match (concat gnus-agent-gcc-header ":") 'fixedcase))))))
520 (defun gnus-agent-possibly-do-gcc ()
521 "Do GCC if Gnus is plugged."
522 (when (or gnus-plugged (not (gnus-agent-any-covered-gcc)))
523 (gnus-inews-do-gcc)))
526 ;;; Group mode commands
529 (defun gnus-agent-fetch-groups (n)
530 "Put all new articles in the current groups into the Agent."
533 (error "Groups can't be fetched when Gnus is unplugged"))
534 (gnus-group-iterate n 'gnus-agent-fetch-group))
536 (defun gnus-agent-fetch-group (&optional group)
537 "Put all new articles in GROUP into the Agent."
538 (interactive (list (gnus-group-group-name)))
539 (let ((state gnus-plugged))
542 (setq group (or group gnus-newsgroup-name))
544 (error "No group on the current line"))
546 (gnus-agent-toggle-plugged gnus-plugged))
547 (let ((gnus-command-method (gnus-find-method-for-group group)))
548 (gnus-agent-with-fetch
549 (gnus-agent-fetch-group-1 group gnus-command-method)
550 (gnus-message 5 "Fetching %s...done" group))))
551 (when (and (not state)
553 (gnus-agent-toggle-plugged gnus-plugged)))))
555 (defun gnus-agent-add-group (category arg)
556 "Add the current group to an agent category."
562 (mapcar (lambda (cat) (list (symbol-name (car cat))))
566 (let ((cat (assq category gnus-category-alist))
568 (gnus-group-iterate arg
570 (when (cadddr (setq c (gnus-group-category group)))
571 (setf (cadddr c) (delete group (cadddr c))))
572 (push group groups)))
573 (setf (cadddr cat) (nconc (cadddr cat) groups))
574 (gnus-category-write)))
576 (defun gnus-agent-remove-group (arg)
577 "Remove the current group from its agent category, if any."
580 (gnus-group-iterate arg
582 (when (cadddr (setq c (gnus-group-category group)))
583 (setf (cadddr c) (delete group (cadddr c))))))
584 (gnus-category-write)))
586 (defun gnus-agent-synchronize-flags ()
587 "Synchronize unplugged flags with servers."
590 (dolist (gnus-command-method gnus-agent-covered-methods)
591 (when (file-exists-p (gnus-agent-lib-file "flags"))
592 (gnus-agent-synchronize-flags-server gnus-command-method)))))
594 (defun gnus-agent-possibly-synchronize-flags ()
595 "Synchronize flags according to `gnus-agent-synchronize-flags'."
598 (dolist (gnus-command-method gnus-agent-covered-methods)
599 (when (file-exists-p (gnus-agent-lib-file "flags"))
600 (gnus-agent-possibly-synchronize-flags-server gnus-command-method)))))
602 (defun gnus-agent-synchronize-flags-server (method)
603 "Synchronize flags set when unplugged for server."
604 (let ((gnus-command-method method))
605 (when (file-exists-p (gnus-agent-lib-file "flags"))
606 (set-buffer (get-buffer-create " *Gnus Agent flag synchronize*"))
608 (nnheader-insert-file-contents (gnus-agent-lib-file "flags"))
609 (if (null (gnus-check-server gnus-command-method))
610 (gnus-message 1 "Couldn't open server %s" (nth 1 gnus-command-method))
612 (if (null (eval (read (current-buffer))))
613 (progn (forward-line)
615 (write-file (gnus-agent-lib-file "flags"))
616 (error "Couldn't set flags from file %s"
617 (gnus-agent-lib-file "flags"))))
618 (delete-file (gnus-agent-lib-file "flags")))
621 (defun gnus-agent-possibly-synchronize-flags-server (method)
622 "Synchronize flags for server according to `gnus-agent-synchronize-flags'."
623 (when (or (and gnus-agent-synchronize-flags
624 (not (eq gnus-agent-synchronize-flags 'ask)))
625 (and (eq gnus-agent-synchronize-flags 'ask)
626 (gnus-y-or-n-p (format "Synchronize flags on server `%s'? "
628 (gnus-agent-synchronize-flags-server method)))
631 ;;; Server mode commands
634 (defun gnus-agent-add-server (server)
635 "Enroll SERVER in the agent program."
636 (interactive (list (gnus-server-server-name)))
638 (error "No server on the current line"))
639 (let ((method (gnus-server-get-method nil (gnus-server-server-name))))
640 (when (gnus-agent-method-p method)
641 (error "Server already in the agent program"))
642 (push method gnus-agent-covered-methods)
643 (gnus-server-update-server server)
644 (gnus-agent-write-servers)
645 (gnus-message 1 "Entered %s into the Agent" server)))
647 (defun gnus-agent-remove-server (server)
648 "Remove SERVER from the agent program."
649 (interactive (list (gnus-server-server-name)))
651 (error "No server on the current line"))
652 (let ((method (gnus-server-get-method nil (gnus-server-server-name))))
653 (unless (gnus-agent-method-p method)
654 (error "Server not in the agent program"))
655 (setq gnus-agent-covered-methods
656 (delete method gnus-agent-covered-methods))
657 (gnus-server-update-server server)
658 (gnus-agent-write-servers)
659 (gnus-message 1 "Removed %s from the agent" server)))
661 (defun gnus-agent-read-servers ()
662 "Read the alist of covered servers."
664 (let ((method (gnus-server-get-method
668 (unless (member method gnus-agent-covered-methods)
669 (push method gnus-agent-covered-methods))
670 (gnus-message 1 "Ignoring disappeared server `%s'" m)
672 (gnus-agent-read-file
673 (nnheader-concat gnus-agent-directory "lib/servers"))))
675 (defun gnus-agent-write-servers ()
676 "Write the alist of covered servers."
677 (gnus-make-directory (nnheader-concat gnus-agent-directory "lib"))
678 (let ((coding-system-for-write nnheader-file-coding-system)
679 (file-name-coding-system nnmail-pathname-coding-system))
680 (with-temp-file (nnheader-concat gnus-agent-directory "lib/servers")
681 (prin1 (mapcar 'gnus-method-simplify gnus-agent-covered-methods)
688 (defun gnus-agent-mark-article (n &optional unmark)
689 "Mark the next N articles as downloadable.
690 If N is negative, mark backward instead. If UNMARK is non-nil, remove
691 the mark instead. The difference between N and the actual number of
692 articles marked is returned."
694 (let ((backward (< n 0))
699 (gnus-summary-set-agent-mark
700 (gnus-summary-article-number) unmark)
701 (zerop (gnus-summary-next-subject (if backward -1 1) nil t))))
704 (gnus-message 7 "No more articles"))
705 (gnus-summary-recenter)
706 (gnus-summary-position-point)
709 (defun gnus-agent-unmark-article (n)
710 "Remove the downloadable mark from the next N articles.
711 If N is negative, unmark backward instead. The difference between N and
712 the actual number of articles unmarked is returned."
714 (gnus-agent-mark-article n t))
716 (defun gnus-agent-toggle-mark (n)
717 "Toggle the downloadable mark from the next N articles.
718 If N is negative, toggle backward instead. The difference between N and
719 the actual number of articles toggled is returned."
721 (gnus-agent-mark-article n 'toggle))
723 (defun gnus-summary-set-agent-mark (article &optional unmark)
724 "Mark ARTICLE as downloadable. If UNMARK is nil, article is marked.
725 When UNMARK is t, the article is unmarked. For any other value, the
726 article's mark is toggled."
727 (let ((unmark (cond ((eq nil unmark)
732 (memq article gnus-newsgroup-downloadable)))))
733 (gnus-summary-update-mark
736 (setq gnus-newsgroup-downloadable
737 (delq article gnus-newsgroup-downloadable))
738 (gnus-article-mark article))
740 (setq gnus-newsgroup-downloadable
741 (gnus-add-to-sorted-list gnus-newsgroup-downloadable article))
742 gnus-downloadable-mark)
746 (defun gnus-agent-get-undownloaded-list ()
747 "Construct list of articles that have not been downloaded."
748 (let ((gnus-command-method (gnus-find-method-for-group gnus-newsgroup-name)))
749 (when (set (make-local-variable 'gnus-newsgroup-agentized) (gnus-agent-method-p gnus-command-method))
750 (let* ((alist (gnus-agent-load-alist gnus-newsgroup-name))
751 (headers gnus-newsgroup-headers)
752 (undownloaded (list nil))
754 (while (and alist headers)
755 (let ((a (caar alist))
756 (h (mail-header-number (car headers))))
758 (pop alist)) ; ignore IDs in the alist that are not being displayed in the summary
760 (pop headers)) ; ignore headers that are not in the alist as these should be fictious (see nnagent-retrieve-headers).
764 nil; ignore already downloaded
769 (gnus-agent-append-to-list tail a)))))
770 (setq gnus-newsgroup-undownloaded (cdr undownloaded))))))
772 (defun gnus-agent-catchup ()
773 "Mark all undownloaded articles as read."
776 (while gnus-newsgroup-undownloaded
777 (gnus-summary-mark-article
778 (pop gnus-newsgroup-undownloaded) gnus-catchup-mark)))
779 (gnus-summary-position-point))
781 (defun gnus-agent-summary-fetch-series ()
783 (when gnus-newsgroup-processable
784 (setq gnus-newsgroup-downloadable
785 (let* ((dl gnus-newsgroup-downloadable)
786 (gnus-newsgroup-downloadable (sort gnus-newsgroup-processable '<))
787 (fetched-articles (gnus-agent-summary-fetch-group)))
788 (dolist (article fetched-articles)
789 (gnus-summary-remove-process-mark article))
790 (gnus-sorted-ndifference dl fetched-articles)))))
792 (defun gnus-agent-summary-fetch-group (&optional all)
793 "Fetch the downloadable articles in the group.
794 Optional arg ALL, if non-nil, means to fetch all articles."
797 (if all gnus-newsgroup-articles
798 gnus-newsgroup-downloadable))
799 (gnus-command-method (gnus-find-method-for-group gnus-newsgroup-name))
805 (gnus-agent-toggle-plugged t))
807 (error "No articles to download"))
808 (gnus-agent-with-fetch
809 (setq gnus-newsgroup-undownloaded
810 (gnus-sorted-ndifference gnus-newsgroup-undownloaded
811 (setq fetched-articles (gnus-agent-fetch-articles gnus-newsgroup-name articles)))))
814 (dolist (article articles)
815 (setq gnus-newsgroup-downloadable
816 (delq article gnus-newsgroup-downloadable))
817 (if gnus-agent-mark-unread-after-downloaded
818 (gnus-summary-mark-article article gnus-unread-mark))
819 (when (gnus-summary-goto-subject article nil t)
820 (gnus-summary-update-download-mark article)))))
821 (when (and (not state)
823 (gnus-agent-toggle-plugged nil)))
826 (defun gnus-agent-fetch-selected-article ()
827 "Fetch the current article as it is selected.
828 This can be added to `gnus-select-article-hook' or
829 `gnus-mark-article-hook'."
830 (let ((gnus-command-method gnus-current-select-method))
831 (when (and gnus-plugged (gnus-agent-method-p gnus-command-method))
832 (when (gnus-agent-fetch-articles
834 (list gnus-current-article))
835 (setq gnus-newsgroup-undownloaded
836 (delq gnus-current-article gnus-newsgroup-undownloaded))
837 (gnus-summary-update-line gnus-current-article)))))
840 ;;; Internal functions
843 (defun gnus-agent-save-active (method)
844 (gnus-agent-save-active-1 method 'gnus-active-to-gnus-format))
846 (defun gnus-agent-save-active-1 (method function)
847 (when (gnus-agent-method-p method)
848 (let* ((gnus-command-method method)
849 (new (gnus-make-hashtable (count-lines (point-min) (point-max))))
850 (file (gnus-agent-lib-file "active")))
851 (funcall function nil new)
852 (gnus-agent-write-active file new)
854 (nnheader-insert-file-contents file))))
856 (defun gnus-agent-write-active (file new)
857 (let ((orig (gnus-make-hashtable (count-lines (point-min) (point-max))))
858 (file (gnus-agent-lib-file "active"))
860 (when (file-exists-p file)
862 (nnheader-insert-file-contents file)
863 (gnus-active-to-gnus-format nil orig))
866 (when (and sym (boundp sym))
867 (if (and (boundp (setq osym (intern (symbol-name sym) orig)))
868 (setq elem (symbol-value osym)))
870 (if (and (integerp (car (symbol-value sym)))
871 (> (car elem) (car (symbol-value sym))))
872 (setcar elem (car (symbol-value sym))))
873 (if (integerp (cdr (symbol-value sym)))
874 (setcdr elem (cdr (symbol-value sym)))))
875 (set (intern (symbol-name sym) orig) (symbol-value sym)))))
877 (gnus-make-directory (file-name-directory file))
878 (let ((nnmail-active-file-coding-system gnus-agent-file-coding-system))
879 ;; The hashtable contains real names of groups, no more prefix
880 ;; removing, so set `full' to `t'.
881 (gnus-write-active-file file orig t))))
883 (defun gnus-agent-save-groups (method)
884 (gnus-agent-save-active-1 method 'gnus-groups-to-gnus-format))
886 (defun gnus-agent-save-group-info (method group active)
887 (when (gnus-agent-method-p method)
888 (let* ((gnus-command-method method)
889 (coding-system-for-write nnheader-file-coding-system)
890 (file-name-coding-system nnmail-pathname-coding-system)
891 (file (gnus-agent-lib-file "active"))
893 (gnus-make-directory (file-name-directory file))
895 ;; Emacs got problem to match non-ASCII group in multibyte buffer.
896 (mm-disable-multibyte)
897 (when (file-exists-p file)
898 (nnheader-insert-file-contents file))
899 (goto-char (point-min))
900 (when (re-search-forward
901 (concat "^" (regexp-quote group) " ") nil t)
903 (read (current-buffer)) ;; max
904 (setq oactive-min (read (current-buffer)))) ;; min
906 (insert (format "%S %d %d y\n" (intern group)
908 (or oactive-min (car active))))
909 (goto-char (point-max))
910 (while (search-backward "\\." nil t)
913 (defun gnus-agent-group-path (group)
914 "Translate GROUP into a path."
915 (if nnmail-use-long-file-names
916 (gnus-group-real-name group)
917 (nnheader-translate-file-chars
918 (nnheader-replace-chars-in-string
919 (nnheader-replace-duplicate-chars-in-string
920 (nnheader-replace-chars-in-string
921 (gnus-group-real-name group)
926 (defun gnus-agent-get-function (method)
927 (if (gnus-online method)
932 ;;; History functions
934 (defun gnus-agent-history-buffer ()
935 (cdr (assoc (gnus-agent-method) gnus-agent-history-buffers)))
937 (defun gnus-agent-open-history ()
939 (push (cons (gnus-agent-method)
940 (set-buffer (gnus-get-buffer-create
941 (format " *Gnus agent %s history*"
942 (gnus-agent-method)))))
943 gnus-agent-history-buffers)
944 (mm-disable-multibyte) ;; everything is binary
947 (let ((file (gnus-agent-lib-file "history")))
948 (when (file-exists-p file)
949 (nnheader-insert-file-contents file))
950 (set (make-local-variable 'gnus-agent-file-name) file))))
952 (defun gnus-agent-close-history ()
953 (when (gnus-buffer-live-p gnus-agent-current-history)
954 (kill-buffer gnus-agent-current-history)
955 (setq gnus-agent-history-buffers
956 (delq (assoc (gnus-agent-method) gnus-agent-history-buffers)
957 gnus-agent-history-buffers))))
963 (defun gnus-agent-fetch-articles (group articles)
964 "Fetch ARTICLES from GROUP and put them into the Agent."
966 (gnus-agent-load-alist group)
967 (let* ((alist gnus-agent-article-alist)
968 (headers (if (< (length articles) 2) nil gnus-newsgroup-headers))
969 (selected-sets (list nil))
973 ;; Check each article
974 (while (setq article (pop articles))
975 ;; Skip alist entries preceeding this article
976 (while (> article (or (caar alist) (1+ article)))
977 (setq alist (cdr alist)))
979 ;; Prune off articles that we have already fetched.
980 (unless (and (eq article (caar alist))
982 ;; Skip headers preceeding this article
985 (let* ((header (car headers)))
987 (mail-header-number header)
989 (setq headers (cdr headers)))
991 ;; Add this article to the current set
992 (setcar selected-sets (cons article (car selected-sets)))
994 ;; Update the set size, when the set is too large start a
995 ;; new one. I do this after adding the article as I want at
996 ;; least one article in each set.
997 (when (< gnus-agent-max-fetch-size
998 (setq current-set-size (+ current-set-size (if (= header-number article)
999 (mail-header-chars (car headers))
1001 (setcar selected-sets (nreverse (car selected-sets)))
1002 (setq selected-sets (cons nil selected-sets)
1003 current-set-size 0))))
1005 (when (or (cdr selected-sets) (car selected-sets))
1006 (let* ((fetched-articles (list nil))
1007 (tail-fetched-articles fetched-articles)
1009 (gnus-agent-directory)
1010 (gnus-agent-group-path group) "/"))
1011 (date (time-to-days (current-time)))
1012 (case-fold-search t)
1015 (setcar selected-sets (nreverse (car selected-sets)))
1016 (setq selected-sets (nreverse selected-sets))
1018 (gnus-make-directory dir)
1019 (gnus-message 7 "Fetching articles for %s..." group)
1022 (while (setq articles (pop selected-sets))
1023 ;; Fetch the articles from the backend.
1024 (if (gnus-check-backend-function 'retrieve-articles group)
1025 (setq pos (gnus-retrieve-articles articles group))
1028 (while (setq article (pop articles))
1029 (gnus-message 10 "Fetching article %s for %s..."
1032 (gnus-backlog-request-article group article
1034 (gnus-request-article article group))
1035 (goto-char (point-max))
1036 (push (cons article (point)) pos)
1037 (insert-buffer-substring nntp-server-buffer)))
1038 (copy-to-buffer nntp-server-buffer (point-min) (point-max))
1039 (setq pos (nreverse pos)))))
1040 ;; Then save these articles into the Agent.
1042 (set-buffer nntp-server-buffer)
1044 (narrow-to-region (cdar pos) (or (cdadr pos) (point-max)))
1045 (goto-char (point-min))
1046 (unless (eobp) ;; Don't save empty articles.
1047 (when (search-forward "\n\n" nil t)
1048 (when (search-backward "\nXrefs: " nil t)
1049 ;; Handle cross posting.
1050 (goto-char (match-end 0)) ; move to end of header name
1051 (skip-chars-forward "^ ") ; skip server name
1052 (skip-chars-forward " ")
1054 (while (looking-at "\\([^: \n]+\\):\\([0-9]+\\) *")
1055 (push (cons (buffer-substring (match-beginning 1)
1057 (string-to-int (buffer-substring (match-beginning 2)
1060 (goto-char (match-end 0)))
1061 (gnus-agent-crosspost crosses (caar pos) date)))
1062 (goto-char (point-min))
1063 (if (not (re-search-forward
1064 "^Message-ID: *<\\([^>\n]+\\)>" nil t))
1065 (setq id "No-Message-ID-in-article")
1066 (setq id (buffer-substring (match-beginning 1) (match-end 1))))
1067 (let ((coding-system-for-write
1068 gnus-agent-file-coding-system))
1069 (write-region (point-min) (point-max)
1070 (concat dir (number-to-string (caar pos)))
1073 (gnus-agent-append-to-list tail-fetched-articles (caar pos)))
1077 (gnus-agent-save-alist group (cdr fetched-articles) date))
1078 (cdr fetched-articles))))))
1080 (defun gnus-agent-crosspost (crosses article &optional date)
1081 (setq date (or date t))
1083 (let (gnus-agent-article-alist group alist beg end)
1085 (set-buffer gnus-agent-overview-buffer)
1086 (when (nnheader-find-nov-line article)
1089 (setq end (progn (forward-line 1) (point)))))
1091 (setq group (caar crosses))
1092 (unless (setq alist (assoc group gnus-agent-group-alist))
1093 (push (setq alist (list group (gnus-agent-load-alist (caar crosses))))
1094 gnus-agent-group-alist))
1095 (setcdr alist (cons (cons (cdar crosses) date) (cdr alist)))
1097 (set-buffer (gnus-get-buffer-create (format " *Gnus agent overview %s*"
1099 (when (= (point-max) (point-min))
1100 (push (cons group (current-buffer)) gnus-agent-buffer-alist)
1102 (nnheader-insert-file-contents
1103 (gnus-agent-article-name ".overview" group))))
1104 (nnheader-find-nov-line (string-to-number (cdar crosses)))
1105 (insert (string-to-number (cdar crosses)))
1106 (insert-buffer-substring gnus-agent-overview-buffer beg end)
1107 (gnus-agent-check-overview-buffer))
1110 (defun gnus-agent-check-overview-buffer (&optional buffer)
1111 "Check the overview file given for sanity.
1112 In particular, checks that the file is sorted by article number
1113 and that there are no duplicates."
1114 (let ((prev-num -1))
1117 (set-buffer buffer))
1120 (goto-char (point-min))
1122 (while (< (point) (point-max))
1124 (cur (condition-case nil
1125 (read (current-buffer))
1128 ((or (not (integerp cur))
1129 (not (eq (char-after) ?\t)))
1131 "Overview buffer contains garbage '%s'."
1133 p (gnus-point-at-eol))))
1136 "Duplicate overview line for %d" cur)
1137 (delete-region (point) (progn (forward-line 1) (point))))
1139 (gnus-message 1 "Junk article number %d" cur)
1140 (delete-region (point) (progn (forward-line 1) (point))))
1142 (sort-numeric-fields 1 (point-min) (point-max))
1143 (goto-char (point-min))
1145 (gnus-message 1 "Overview buffer not sorted!"))
1147 (setq prev-num cur)))
1148 (forward-line 1)))))))
1150 (defun gnus-agent-flush-cache ()
1152 (while gnus-agent-buffer-alist
1153 (set-buffer (cdar gnus-agent-buffer-alist))
1154 (let ((coding-system-for-write
1155 gnus-agent-file-coding-system))
1156 (write-region (point-min) (point-max)
1157 (gnus-agent-article-name ".overview"
1158 (caar gnus-agent-buffer-alist))
1160 (pop gnus-agent-buffer-alist))
1161 (while gnus-agent-group-alist
1162 (with-temp-file (gnus-agent-article-name ".agentview" (caar gnus-agent-group-alist))
1163 (princ (cdar gnus-agent-group-alist))
1165 (princ 1 (current-buffer))
1167 (pop gnus-agent-group-alist))))
1169 (defun gnus-agent-fetch-headers (group &optional force)
1170 "Fetch interesting headers into the agent. The group's overview
1171 file will be updated to include the headers while a list of available
1172 article numbers will be returned."
1173 (let* ((fetch-all (and gnus-agent-consider-all-articles
1174 ;; Do not fetch all headers if the predicate
1175 ;; implies that we only consider unread articles.
1176 (not (gnus-predicate-implies-unread
1177 (or (gnus-group-find-parameter
1178 group 'agent-predicate t)
1179 (cadr (gnus-group-category group)))))))
1180 (articles (if fetch-all
1181 (gnus-uncompress-range (gnus-active group))
1182 (gnus-list-of-unread-articles group)))
1183 (gnus-decode-encoded-word-function 'identity)
1184 (file (gnus-agent-article-name ".overview" group))
1188 ;; Add articles with marks to the list of article headers we want to
1189 ;; fetch. Don't fetch articles solely on the basis of a recent or seen
1190 ;; mark, but do fetch recent or seen articles if they have other, more
1191 ;; interesting marks. (We have to fetch articles with boring marks
1192 ;; because otherwise the agent will remove their marks.)
1193 (dolist (arts (gnus-info-marks (gnus-get-info group)))
1194 (unless (memq (car arts) '(seen recent killed cache))
1195 (setq articles (gnus-range-add articles (cdr arts)))))
1196 (setq articles (sort (gnus-uncompress-sequence articles) '<)))
1198 ;; At this point, I have the list of articles to consider for fetching.
1199 ;; This is the list that I'll return to my caller. Some of these articles may have already
1200 ;; been fetched. That's OK as the fetch article code will filter those out.
1201 ;; Internally, I'll filter this list to just those articles whose headers need to be fetched.
1202 (let ((articles articles))
1203 ;; Remove known articles.
1204 (when (gnus-agent-load-alist group)
1205 ;; Remove articles marked as downloaded.
1207 ;; I want to fetch all headers in the active range.
1208 ;; Therefore, exclude only those headers that are in the article alist.
1209 ;; NOTE: This is probably NOT what I want to do after agent expiration in this group.
1210 (setq articles (gnus-agent-uncached-articles articles group))
1212 ;; I want to only fetch those headers that have never been fetched.
1213 ;; Therefore, exclude all headers that are, or WERE, in the article alist.
1214 (let ((low (1+ (caar (last gnus-agent-article-alist))))
1215 (high (cdr (gnus-active group))))
1216 ;; Low can be greater than High when the same group is fetched twice
1217 ;; in the same session {The first fetch will fill the article alist
1218 ;; such that (last gnus-agent-article-alist) equals (cdr (gnus-active group))}.
1219 ;; The addition of one(the 1+ above) then forces Low to be greater than High.
1220 ;; When this happens, gnus-list-range-intersection returns nil which indicates
1221 ;; that no headers need to be fetched. -- Kevin
1222 (setq articles (gnus-list-range-intersection
1223 articles (list (cons low high)))))))
1225 (set-buffer nntp-server-buffer)
1229 (gnus-message 7 "Fetching headers for %s..." group)
1232 (gnus-make-directory (nnheader-translate-file-chars
1233 (file-name-directory file) t))
1235 (unless (eq 'nov (gnus-retrieve-headers articles group))
1236 (nnvirtual-convert-headers))
1237 (gnus-agent-check-overview-buffer)
1238 ;; Move these headers to the overview buffer so that gnus-agent-braid-nov can merge them
1239 ;; with the contents of FILE.
1240 (copy-to-buffer gnus-agent-overview-buffer (point-min) (point-max))
1241 (when (file-exists-p file)
1242 (gnus-agent-braid-nov group articles file))
1243 (let ((coding-system-for-write
1244 gnus-agent-file-coding-system))
1245 (gnus-agent-check-overview-buffer)
1246 (write-region (point-min) (point-max) file nil 'silent))
1247 (gnus-agent-save-alist group articles nil)
1251 (nnheader-insert-file-contents file))))
1255 (defsubst gnus-agent-copy-nov-line (article)
1257 (set-buffer gnus-agent-overview-buffer)
1258 (while (and (not (eobp))
1259 (< (setq art (read (current-buffer))) article))
1263 (not (eq article art)))
1264 (set-buffer nntp-server-buffer)
1266 (setq e (progn (forward-line 1) (point)))
1267 (set-buffer nntp-server-buffer)
1268 (insert-buffer-substring gnus-agent-overview-buffer b e))))
1270 (defun gnus-agent-braid-nov (group articles file)
1271 "Merges the article headers identified by ARTICLES from gnus-agent-overview-buffer with the contents
1272 of FILE placing the combined headers in nntp-server-buffer."
1274 (set-buffer gnus-agent-overview-buffer)
1275 (goto-char (point-min))
1276 (set-buffer nntp-server-buffer)
1278 (nnheader-insert-file-contents file)
1279 (goto-char (point-max))
1281 (unless (looking-at "[0-9]+\t")
1282 ;; Remove corrupted lines
1283 (gnus-message 1 "Overview %s is corrupted. Removing corrupted lines..." file)
1284 (goto-char (point-min))
1286 (if (looking-at "[0-9]+\t")
1288 (delete-region (point) (progn (forward-line 1) (point)))))
1290 (unless (or (= (point-min) (point-max))
1291 (< (setq last (read (current-buffer))) (car articles)))
1292 ;; We do it the hard way.
1293 (when (nnheader-find-nov-line (car articles))
1294 ;; Replacing existing NOV entry
1295 (delete-region (point) (progn (forward-line 1) (point))))
1296 (gnus-agent-copy-nov-line (pop articles))
1300 (while (let ((art (read (current-buffer))))
1301 (cond ((< art (car articles))
1304 ((= art (car articles))
1306 (delete-region (point) (progn (forward-line 1) (point)))
1312 (gnus-agent-copy-nov-line (pop articles)))))
1314 ;; Copy the rest lines
1315 (set-buffer nntp-server-buffer)
1316 (goto-char (point-max))
1319 (set-buffer gnus-agent-overview-buffer)
1321 (while (<= (read (current-buffer)) last)
1324 (setq start (point))
1325 (set-buffer nntp-server-buffer))
1326 (insert-buffer-substring gnus-agent-overview-buffer start))))
1328 (eval-when-compile ; Keeps the compiler from warning about the free variable in gnus-agent-read-agentview
1329 (defvar gnus-agent-read-agentview))
1331 (defun gnus-agent-load-alist (group)
1332 (let ((gnus-agent-read-agentview group)) ; Binds free variable that's used in gnus-agent-read-agentview
1333 "Load the article-state alist for GROUP."
1334 (setq gnus-agent-article-alist
1335 (gnus-cache-file-contents
1336 (gnus-agent-article-name ".agentview" group)
1337 'gnus-agent-file-loading-cache
1338 'gnus-agent-read-agentview))))
1340 ;; Save format may be either 1 or 2. Two is the new, compressed format that is still being tested. Format 1 is uncompressed but known to be reliable.
1341 (defconst gnus-agent-article-alist-save-format 2)
1343 (defun gnus-agent-read-agentview (file)
1344 "Load FILE and do a `read' there."
1347 (nnheader-insert-file-contents file)
1348 (goto-char (point-min))
1349 (let ((alist (read (current-buffer)))
1350 (version (condition-case nil (read (current-buffer))
1354 (cond ((= version 0)
1355 (let ((inhibit-quit t)
1357 (gnus-agent-open-history)
1358 (set-buffer (gnus-agent-history-buffer))
1359 (goto-char (point-min))
1361 (if (and (looking-at
1362 "[^\t\n]+\t\\([0-9]+\\)\t\\([^ \n]+\\) \\([0-9]+\\)")
1363 (string= (match-string 2)
1364 gnus-agent-read-agentview)
1365 (setq entry (assoc (string-to-number (match-string 3)) alist)))
1366 (setcdr entry (string-to-number (match-string 1))))
1368 (gnus-agent-close-history)
1369 (setq changed-version t)))
1371 (setq changed-version (not (= 1 gnus-agent-article-alist-save-format))))
1374 (mapcar (lambda (comp-list)
1375 (let ((state (car comp-list))
1376 (sequence (gnus-uncompress-sequence (cdr comp-list))))
1377 (mapcar (lambda (article-id)
1378 (setq uncomp (cons (cons article-id state) uncomp))) sequence))) alist)
1379 (setq alist (sort uncomp (lambda (first second) (< (car first) (car second)))))
1382 (when changed-version
1383 (let ((gnus-agent-article-alist alist))
1384 (gnus-agent-save-alist gnus-agent-read-agentview)))
1387 (defun gnus-agent-save-alist (group &optional articles state dir)
1388 "Save the article-state alist for GROUP."
1389 (let* ((file-name-coding-system nnmail-pathname-coding-system)
1390 (prev (cons nil gnus-agent-article-alist))
1392 print-level print-length item article)
1393 (while (setq article (pop articles))
1394 (while (and (cdr prev)
1395 (< (caadr prev) article))
1396 (setq prev (cdr prev)))
1399 (setcdr prev (list (cons article state))))
1400 ((> (caadr prev) article)
1401 (setcdr prev (cons (cons article state) (cdr prev))))
1402 ((= (caadr prev) article)
1403 (setcdr (cadr prev) state)))
1404 (setq prev (cdr prev)))
1405 (setq gnus-agent-article-alist (cdr all))
1407 (gnus-make-directory dir)
1408 (gnus-make-directory (gnus-agent-article-name "" group)))
1409 (with-temp-file (if dir
1410 (expand-file-name ".agentview" dir)
1411 (gnus-agent-article-name ".agentview" group))
1412 (cond ((eq gnus-agent-article-alist-save-format 1)
1413 (princ gnus-agent-article-alist (current-buffer)))
1414 ((eq gnus-agent-article-alist-save-format 2)
1415 (let ((compressed nil))
1416 (mapcar (lambda (pair)
1417 (let* ((article-id (car pair))
1418 (day-of-download (cdr pair))
1419 (comp-list (assq day-of-download compressed)))
1421 (setcdr comp-list (cons article-id (cdr comp-list)))
1422 (setq compressed (cons (list day-of-download article-id) compressed)))
1423 nil)) gnus-agent-article-alist)
1424 (mapcar (lambda (comp-list) (setcdr comp-list (gnus-compress-sequence (nreverse (cdr comp-list))))) compressed)
1425 (princ compressed (current-buffer))
1430 (princ gnus-agent-article-alist-save-format (current-buffer))
1433 (defun gnus-agent-article-name (article group)
1434 (expand-file-name (if (stringp article) article (string-to-number article))
1435 (file-name-as-directory
1436 (expand-file-name (gnus-agent-group-path group)
1437 (gnus-agent-directory)))))
1439 (defun gnus-agent-batch-confirmation (msg)
1440 "Show error message and return t."
1441 (gnus-message 1 msg)
1445 (defun gnus-agent-batch-fetch ()
1446 "Start Gnus and fetch session."
1449 (let ((gnus-agent-confirmation-function 'gnus-agent-batch-confirmation))
1450 (gnus-agent-fetch-session))
1453 (defun gnus-agent-fetch-session ()
1454 "Fetch all articles and headers that are eligible for fetching."
1456 (unless gnus-agent-covered-methods
1457 (error "No servers are covered by the Gnus agent"))
1458 (unless gnus-plugged
1459 (error "Can't fetch articles while Gnus is unplugged"))
1460 (let ((methods gnus-agent-covered-methods)
1461 groups group gnus-command-method)
1466 (setq gnus-command-method (car methods))
1467 (when (and (or (gnus-server-opened gnus-command-method)
1468 (gnus-open-server gnus-command-method))
1469 (gnus-online gnus-command-method))
1470 (setq groups (gnus-groups-from-server (car methods)))
1471 (gnus-agent-with-fetch
1472 (while (setq group (pop groups))
1473 (when (<= (gnus-group-level group) gnus-agent-handle-level)
1474 (gnus-agent-fetch-group-1 group gnus-command-method))))))
1476 (unless (funcall gnus-agent-confirmation-function
1477 (format "Error %s. Continue? " (cdr err)))
1478 (error "Cannot fetch articles into the Gnus agent")))
1480 (unless (funcall gnus-agent-confirmation-function
1481 (format "Quit fetching session %s. Continue? "
1483 (signal 'quit "Cannot fetch articles into the Gnus agent"))))
1485 (run-hooks 'gnus-agent-fetch-hook)
1486 (gnus-message 6 "Finished fetching articles into the Gnus agent"))))
1488 (defun gnus-agent-fetch-group-1 (group method)
1490 (let ((gnus-command-method method)
1491 (gnus-newsgroup-name group)
1492 (gnus-newsgroup-dependencies gnus-newsgroup-dependencies)
1493 (gnus-newsgroup-headers gnus-newsgroup-headers)
1494 (gnus-newsgroup-scored gnus-newsgroup-scored)
1495 (gnus-use-cache gnus-use-cache)
1496 (gnus-summary-expunge-below gnus-summary-expunge-below)
1497 (gnus-summary-mark-below gnus-summary-mark-below)
1498 (gnus-orphan-score gnus-orphan-score)
1499 ;; Maybe some other gnus-summary local variables should also
1505 category predicate info marks score-param
1507 (unless (gnus-check-group group)
1508 (error "Can't open server for %s" group))
1511 (when (or gnus-newsgroup-active
1513 (gnus-activate-group group))
1514 (let ((marked-articles gnus-newsgroup-downloadable))
1515 ;; Identify the articles marked for download
1516 (unless gnus-newsgroup-active ;; This needs to be a
1517 ;; gnus-summary local variable
1518 ;; that is NOT bound to any
1519 ;; value above (It's global
1520 ;; value should default to nil).
1521 (dolist (mark gnus-agent-download-marks)
1522 (let ((arts (cdr (assq mark (gnus-info-marks
1523 (setq info (gnus-get-info group)))))))
1525 (setq marked-articles (nconc (gnus-uncompress-range arts)
1528 (setq marked-articles (sort marked-articles '<))
1530 ;; Fetch any new articles from the server
1531 (setq articles (gnus-agent-fetch-headers group))
1533 ;; Merge new articles with marked
1534 (setq articles (sort (append marked-articles articles) '<))
1537 ;; Parse them and see which articles we want to fetch.
1538 (setq gnus-newsgroup-dependencies
1539 (or gnus-newsgroup-dependencies
1540 (make-vector (length articles) 0)))
1542 (setq gnus-newsgroup-headers
1543 (or gnus-newsgroup-headers
1544 (gnus-get-newsgroup-headers-xover articles nil nil
1546 ;; `gnus-agent-overview-buffer' may be killed for
1547 ;; timeout reason. If so, recreate it.
1548 (gnus-agent-create-buffer)
1550 ;; Figure out how to select articles in this group
1551 (setq category (gnus-group-category group))
1555 (or (gnus-group-find-parameter group 'agent-predicate t)
1558 ;; If the selection predicate requires scoring, score each header
1559 (unless (memq predicate '(gnus-agent-true gnus-agent-false))
1561 (or (gnus-group-get-parameter group 'agent-score t)
1563 ;; Translate score-param into real one
1566 ((eq score-param 'file)
1567 (setq score-param (gnus-all-score-files group)))
1568 ((stringp (car score-param)))
1570 (setq score-param (list (list score-param)))))
1572 (gnus-score-headers score-param))))
1574 (unless (and (eq predicate 'gnus-agent-false)
1575 (not marked-articles))
1576 (let* ((arts (list nil))
1578 (alist (gnus-agent-load-alist group))
1580 (marked-articles marked-articles)
1582 (while (setq gnus-headers (pop gnus-newsgroup-headers))
1583 (let ((num (mail-header-number gnus-headers)))
1584 ;; Determine if this article is already in the cache
1586 (> num (caar alist)))
1587 (setq alist (cdr alist)))
1589 (unless (and (eq num (caar alist))
1592 ;; Determine if this article was marked for download.
1593 (while (and marked-articles
1594 (> num (car marked-articles)))
1595 (setq marked-articles
1596 (cdr marked-articles)))
1598 ;; When this article is marked, or selected by the
1599 ;; predicate, add it to the download list
1600 (when (or (eq num (car marked-articles))
1602 (or (cdr (assq num gnus-newsgroup-scored))
1603 gnus-summary-default-score)))
1604 (funcall predicate)))
1605 (gnus-agent-append-to-list arts-tail num)))))
1607 ;; Fetch all selected articles
1609 (setq gnus-newsgroup-undownloaded
1610 (gnus-sorted-ndifference gnus-newsgroup-undownloaded
1611 (setq fetched-articles (gnus-agent-fetch-articles group (cdr arts)))))
1613 (let ((unfetched-articles (gnus-sorted-ndifference (cdr arts) fetched-articles)))
1614 (if gnus-newsgroup-active
1616 (dolist (article (cdr arts))
1617 (setq gnus-newsgroup-downloadable
1618 (delq article gnus-newsgroup-downloadable))
1619 (when (gnus-summary-goto-subject article nil t)
1620 (gnus-summary-update-download-mark article)))
1621 (dolist (article fetched-articles)
1622 (if gnus-agent-mark-unread-after-downloaded
1623 (gnus-summary-mark-article article gnus-unread-mark)))
1624 (dolist (article unfetched-articles)
1625 (gnus-summary-mark-article article gnus-canceled-mark)))
1626 ;; When some, or all, of the marked articles came
1627 ;; from the download mark. Remove that mark. I
1628 ;; didn't do this earlier as I only want to remove
1629 ;; the marks after the fetch is completed.
1631 (dolist (mark gnus-agent-download-marks)
1632 (when (eq mark 'download)
1633 (let ((marked-arts (assq mark (gnus-info-marks
1634 (setq info (gnus-get-info group))))))
1635 (when (cdr marked-arts)
1636 (setq marks (delq marked-arts (gnus-info-marks info)))
1637 (gnus-info-set-marks info marks)))))
1638 (let ((read (gnus-info-read (or info (setq info (gnus-get-info group))))))
1639 (gnus-info-set-read info (gnus-add-to-range read unfetched-articles)))
1641 (gnus-group-update-group group t)
1645 (concat "(gnus-group-set-info '"
1646 (gnus-prin1-to-string info)
1650 ;;; Agent Category Mode
1653 (defvar gnus-category-mode-hook nil
1654 "Hook run in `gnus-category-mode' buffers.")
1656 (defvar gnus-category-line-format " %(%20c%): %g\n"
1657 "Format of category lines.
1659 Valid specifiers include:
1660 %c Topic name (string)
1661 %g The number of groups in the topic (integer)
1663 General format specifiers can also be used. See Info node
1664 `(gnus)Formatting Variables'.")
1666 (defvar gnus-category-mode-line-format "Gnus: %%b"
1667 "The format specification for the category mode line.")
1669 (defvar gnus-agent-short-article 100
1670 "Articles that have fewer lines than this are short.")
1672 (defvar gnus-agent-long-article 200
1673 "Articles that have more lines than this are long.")
1675 (defvar gnus-agent-low-score 0
1676 "Articles that have a score lower than this have a low score.")
1678 (defvar gnus-agent-high-score 0
1679 "Articles that have a score higher than this have a high score.")
1682 ;;; Internal variables.
1684 (defvar gnus-category-buffer "*Agent Category*")
1686 (defvar gnus-category-line-format-alist
1687 `((?c gnus-tmp-name ?s)
1688 (?g gnus-tmp-groups ?d)))
1690 (defvar gnus-category-mode-line-format-alist
1691 `((?u user-defined ?s)))
1693 (defvar gnus-category-line-format-spec nil)
1694 (defvar gnus-category-mode-line-format-spec nil)
1696 (defvar gnus-category-mode-map nil)
1697 (put 'gnus-category-mode 'mode-class 'special)
1699 (unless gnus-category-mode-map
1700 (setq gnus-category-mode-map (make-sparse-keymap))
1701 (suppress-keymap gnus-category-mode-map)
1703 (gnus-define-keys gnus-category-mode-map
1704 "q" gnus-category-exit
1705 "k" gnus-category-kill
1706 "c" gnus-category-copy
1707 "a" gnus-category-add
1708 "p" gnus-category-edit-predicate
1709 "g" gnus-category-edit-groups
1710 "s" gnus-category-edit-score
1711 "l" gnus-category-list
1713 "\C-c\C-i" gnus-info-find-node
1714 "\C-c\C-b" gnus-bug))
1716 (defvar gnus-category-menu-hook nil
1717 "*Hook run after the creation of the menu.")
1719 (defun gnus-category-make-menu-bar ()
1720 (gnus-turn-off-edit-menu 'category)
1721 (unless (boundp 'gnus-category-menu)
1723 gnus-category-menu gnus-category-mode-map ""
1725 ["Add" gnus-category-add t]
1726 ["Kill" gnus-category-kill t]
1727 ["Copy" gnus-category-copy t]
1728 ["Edit predicate" gnus-category-edit-predicate t]
1729 ["Edit score" gnus-category-edit-score t]
1730 ["Edit groups" gnus-category-edit-groups t]
1731 ["Exit" gnus-category-exit t]))
1733 (gnus-run-hooks 'gnus-category-menu-hook)))
1735 (defun gnus-category-mode ()
1736 "Major mode for listing and editing agent categories.
1738 All normal editing commands are switched off.
1739 \\<gnus-category-mode-map>
1740 For more in-depth information on this mode, read the manual
1741 \(`\\[gnus-info-find-node]').
1743 The following commands are available:
1745 \\{gnus-category-mode-map}"
1747 (when (gnus-visual-p 'category-menu 'menu)
1748 (gnus-category-make-menu-bar))
1749 (kill-all-local-variables)
1750 (gnus-simplify-mode-line)
1751 (setq major-mode 'gnus-category-mode)
1752 (setq mode-name "Category")
1753 (gnus-set-default-directory)
1754 (setq mode-line-process nil)
1755 (use-local-map gnus-category-mode-map)
1756 (buffer-disable-undo)
1757 (setq truncate-lines t)
1758 (setq buffer-read-only t)
1759 (gnus-run-hooks 'gnus-category-mode-hook))
1761 (defalias 'gnus-category-position-point 'gnus-goto-colon)
1763 (defun gnus-category-insert-line (category)
1764 (let* ((gnus-tmp-name (format "%s" (car category)))
1765 (gnus-tmp-groups (length (cadddr category))))
1767 (gnus-add-text-properties
1771 (eval gnus-category-line-format-spec))
1772 (list 'gnus-category gnus-tmp-name))))
1774 (defun gnus-enter-category-buffer ()
1775 "Go to the Category buffer."
1777 (gnus-category-setup-buffer)
1778 (gnus-configure-windows 'category)
1779 (gnus-category-prepare))
1781 (defun gnus-category-setup-buffer ()
1782 (unless (get-buffer gnus-category-buffer)
1784 (set-buffer (gnus-get-buffer-create gnus-category-buffer))
1785 (gnus-category-mode))))
1787 (defun gnus-category-prepare ()
1788 (gnus-set-format 'category-mode)
1789 (gnus-set-format 'category t)
1790 (let ((alist gnus-category-alist)
1791 (buffer-read-only nil))
1794 (gnus-category-insert-line (pop alist)))
1795 (goto-char (point-min))
1796 (gnus-category-position-point)))
1798 (defun gnus-category-name ()
1799 (or (intern (get-text-property (gnus-point-at-bol) 'gnus-category))
1800 (error "No category on the current line")))
1802 (defun gnus-category-read ()
1803 "Read the category alist."
1804 (setq gnus-category-alist
1805 (or (gnus-agent-read-file
1806 (nnheader-concat gnus-agent-directory "lib/categories"))
1807 (list (list 'default 'short nil nil)))))
1809 (defun gnus-category-write ()
1810 "Write the category alist."
1811 (setq gnus-category-predicate-cache nil
1812 gnus-category-group-cache nil)
1813 (gnus-make-directory (nnheader-concat gnus-agent-directory "lib"))
1814 (with-temp-file (nnheader-concat gnus-agent-directory "lib/categories")
1815 (prin1 gnus-category-alist (current-buffer))))
1817 (defun gnus-category-edit-predicate (category)
1818 "Edit the predicate for CATEGORY."
1819 (interactive (list (gnus-category-name)))
1820 (let ((info (assq category gnus-category-alist)))
1822 (cadr info) (format "Editing the predicate for category %s" category)
1823 `(lambda (predicate)
1824 (setcar (cdr (assq ',category gnus-category-alist)) predicate)
1825 (gnus-category-write)
1826 (gnus-category-list)))))
1828 (defun gnus-category-edit-score (category)
1829 "Edit the score expression for CATEGORY."
1830 (interactive (list (gnus-category-name)))
1831 (let ((info (assq category gnus-category-alist)))
1834 (format "Editing the score expression for category %s" category)
1836 (setcar (cddr (assq ',category gnus-category-alist)) groups)
1837 (gnus-category-write)
1838 (gnus-category-list)))))
1840 (defun gnus-category-edit-groups (category)
1841 "Edit the group list for CATEGORY."
1842 (interactive (list (gnus-category-name)))
1843 (let ((info (assq category gnus-category-alist)))
1845 (cadddr info) (format "Editing the group list for category %s" category)
1847 (setcar (nthcdr 3 (assq ',category gnus-category-alist)) groups)
1848 (gnus-category-write)
1849 (gnus-category-list)))))
1851 (defun gnus-category-kill (category)
1852 "Kill the current category."
1853 (interactive (list (gnus-category-name)))
1854 (let ((info (assq category gnus-category-alist))
1855 (buffer-read-only nil))
1857 (setq gnus-category-alist (delq info gnus-category-alist))
1858 (gnus-category-write)))
1860 (defun gnus-category-copy (category to)
1861 "Copy the current category."
1862 (interactive (list (gnus-category-name) (intern (read-string "New name: "))))
1863 (let ((info (assq category gnus-category-alist)))
1864 (push (list to (gnus-copy-sequence (cadr info))
1865 (gnus-copy-sequence (caddr info)) nil)
1866 gnus-category-alist)
1867 (gnus-category-write)
1868 (gnus-category-list)))
1870 (defun gnus-category-add (category)
1871 "Create a new category."
1872 (interactive "SCategory name: ")
1873 (when (assq category gnus-category-alist)
1874 (error "Category %s already exists" category))
1875 (push (list category 'false nil nil)
1876 gnus-category-alist)
1877 (gnus-category-write)
1878 (gnus-category-list))
1880 (defun gnus-category-list ()
1881 "List all categories."
1883 (gnus-category-prepare))
1885 (defun gnus-category-exit ()
1886 "Return to the group buffer."
1888 (kill-buffer (current-buffer))
1889 (gnus-configure-windows 'group t))
1891 ;; To avoid having 8-bit characters in the source file.
1892 (defvar gnus-category-not (list '! 'not (intern (format "%c" 172))))
1894 (defvar gnus-category-predicate-alist
1895 '((spam . gnus-agent-spam-p)
1896 (short . gnus-agent-short-p)
1897 (long . gnus-agent-long-p)
1898 (low . gnus-agent-low-scored-p)
1899 (high . gnus-agent-high-scored-p)
1900 (read . gnus-agent-read-p)
1901 (true . gnus-agent-true)
1902 (false . gnus-agent-false))
1903 "Mapping from short score predicate symbols to predicate functions.")
1905 (defun gnus-agent-spam-p ()
1906 "Say whether an article is spam or not."
1907 (unless gnus-agent-spam-hashtb
1908 (setq gnus-agent-spam-hashtb (gnus-make-hashtable 1000)))
1909 (if (not (equal (mail-header-references gnus-headers) ""))
1911 (let ((string (gnus-simplify-subject (mail-header-subject gnus-headers))))
1913 (gnus-gethash string gnus-agent-spam-hashtb)
1914 (gnus-sethash string t gnus-agent-spam-hashtb)))))
1916 (defun gnus-agent-short-p ()
1917 "Say whether an article is short or not."
1918 (< (mail-header-lines gnus-headers) gnus-agent-short-article))
1920 (defun gnus-agent-long-p ()
1921 "Say whether an article is long or not."
1922 (> (mail-header-lines gnus-headers) gnus-agent-long-article))
1924 (defun gnus-agent-low-scored-p ()
1925 "Say whether an article has a low score or not."
1926 (< gnus-score gnus-agent-low-score))
1928 (defun gnus-agent-high-scored-p ()
1929 "Say whether an article has a high score or not."
1930 (> gnus-score gnus-agent-high-score))
1932 (defun gnus-agent-read-p ()
1933 "Say whether an article is read or not."
1934 (gnus-member-of-range (mail-header-number gnus-headers)
1935 (gnus-info-read (gnus-get-info gnus-newsgroup-name))))
1937 (defun gnus-category-make-function (cat)
1938 "Make a function from category CAT."
1939 (let ((func (gnus-category-make-function-1 cat)))
1940 (if (and (= (length func) 1)
1941 (symbolp (car func)))
1943 (gnus-byte-compile `(lambda () ,func)))))
1945 (defun gnus-agent-true ()
1949 (defun gnus-agent-false ()
1953 (defun gnus-category-make-function-1 (cat)
1954 "Make a function from category CAT."
1956 ;; Functions are just returned as is.
1958 (gnus-functionp cat))
1959 `(,(or (cdr (assq cat gnus-category-predicate-alist))
1961 ;; More complex category.
1964 ((memq (car cat) '(& and))
1966 ((memq (car cat) '(| or))
1968 ((memq (car cat) gnus-category-not)
1970 ,@(mapcar 'gnus-category-make-function-1 (cdr cat))))
1972 (error "Unknown category type: %s" cat))))
1974 (defun gnus-get-predicate (predicate)
1975 "Return the predicate for CATEGORY."
1976 (or (cdr (assoc predicate gnus-category-predicate-cache))
1977 (let ((func (gnus-category-make-function predicate)))
1978 (setq gnus-category-predicate-cache
1979 (nconc gnus-category-predicate-cache
1980 (list (cons predicate func))))
1983 (defun gnus-predicate-implies-unread (predicate)
1984 "Say whether PREDICATE implies unread articles only.
1985 It is okay to miss some cases, but there must be no false positives.
1986 That is, if this function returns true, then indeed the predicate must
1987 return only unread articles."
1988 ;; Todo: make this work in more cases.
1989 (equal predicate '(not read)))
1991 (defun gnus-group-category (group)
1992 "Return the category GROUP belongs to."
1993 (unless gnus-category-group-cache
1994 (setq gnus-category-group-cache (gnus-make-hashtable 1000))
1995 (let ((cs gnus-category-alist)
1997 (while (setq cat (pop cs))
1998 (setq groups (cadddr cat))
2000 (gnus-sethash (pop groups) cat gnus-category-group-cache)))))
2001 (or (gnus-gethash group gnus-category-group-cache)
2002 (assq 'default gnus-category-alist)))
2004 (defun gnus-agent-expire (&optional articles group force)
2005 "Expire all old articles.
2006 If you want to force expiring of certain articles, this function can
2007 take ARTICLES, GROUP and FORCE parameters as well.
2009 The articles on which the expiration process runs are selected as follows:
2010 if ARTICLES is null, all read and unmarked articles.
2011 if ARTICLES is t, all articles.
2012 if ARTICLES is a list, just those articles.
2013 Setting GROUP will limit expiration to that group.
2014 FORCE is equivalent to setting gnus-agent-expire-days to zero(0)."
2017 (if (or (not (eq articles t))
2018 (yes-or-no-p (concat "Are you sure that you want to expire all articles in " (if group group "every agentized group") ".")))
2019 (let ((methods (if group
2020 (list (gnus-find-method-for-group group))
2021 gnus-agent-covered-methods))
2022 (day (if (numberp gnus-agent-expire-days)
2023 (- (time-to-days (current-time)) gnus-agent-expire-days)
2025 gnus-command-method sym arts pos
2026 history overview file histories elem art nov-file low info
2027 unreads marked article orig lowest highest found days)
2029 (setq overview (gnus-get-buffer-create " *expire overview*"))
2031 (while (setq gnus-command-method (pop methods))
2032 (when (file-exists-p (gnus-agent-lib-file "active"))
2034 (nnheader-insert-file-contents (gnus-agent-lib-file "active"))
2035 (gnus-active-to-gnus-format
2037 (setq orig (gnus-make-hashtable
2038 (count-lines (point-min) (point-max))))))
2039 (dolist (expiring-group (gnus-groups-from-server gnus-command-method))
2041 (equal group expiring-group))
2043 (gnus-agent-directory)
2044 (gnus-agent-group-path expiring-group) "/"))
2046 (gnus-gethash-safe expiring-group orig)))
2048 (gnus-agent-load-alist expiring-group)
2049 (gnus-message 5 "Expiring articles in %s" expiring-group)
2050 (let* ((info (gnus-get-info expiring-group))
2051 (alist gnus-agent-article-alist)
2053 (list (caar (last alist)))))
2054 (unreads ;; Articles that are excluded from the expiration process
2055 (cond (gnus-agent-expire-all
2056 ;; All articles are marked read by global decree
2059 ;; All articles are marked read by function parameter
2062 ;; Unread articles are marked protected from expiration
2063 ;; Don't call gnus-list-of-unread-articles as it returns articles that have not been fetched into the agent.
2064 (ignore-errors (gnus-agent-unread-articles expiring-group)))
2066 ;; All articles EXCEPT those named by the caller are protected from expiration
2067 (gnus-sorted-difference (gnus-uncompress-range (cons (caar alist) (caar (last alist)))) (sort articles '<)))))
2068 (marked ;; More articles that are exluded from the expiration process
2069 (cond (gnus-agent-expire-all
2070 ;; All articles are unmarked by global decree
2073 ;; All articles are unmarked by function parameter
2076 ;; All articles may as well be unmarked as the unreads list already names the articles we are going to keep
2079 ;; Ticked and/or dormant articles are excluded from expiration
2081 (gnus-uncompress-range
2082 (cdr (assq 'tick (gnus-info-marks info))))
2083 (gnus-uncompress-range
2085 (gnus-info-marks info))))))))
2086 (nov-file (concat dir ".overview"))
2092 ;; The normal article alist contains elements that look like (article# . fetch_date)
2093 ;; I need to combine other information with this list. For example, a flag indicating that a particular article MUST BE KEPT.
2094 ;; To do this, I'm going to transform the elements to look like (article# fetch_date keep_flag NOV_entry_marker)
2095 ;; Later, I'll reverse the process to generate the expired article alist.
2097 ;; Convert the alist elements to (article# fetch_date nil nil).
2098 (setq dlist (mapcar (lambda (e) (list (car e) (cdr e) nil nil)) alist))
2100 ;; Convert the keep lists to elements that look like (article# nil keep_flag nil) then append it to the expanded dlist
2101 ;; These statements are sorted by ascending precidence of the keep_flag.
2102 (setq dlist (nconc dlist
2103 (mapcar (lambda (e) (list e nil 'unread nil)) unreads)))
2104 (setq dlist (nconc dlist
2105 (mapcar (lambda (e) (list e nil 'marked nil)) marked)))
2106 (setq dlist (nconc dlist
2107 (mapcar (lambda (e) (list e nil 'special nil)) specials)))
2109 (set-buffer overview)
2111 (when (file-exists-p nov-file)
2112 (gnus-message 7 "gnus-agent-expire: Loading overview...")
2113 (nnheader-insert-file-contents nov-file)
2114 (goto-char (point-min))
2117 (while (< (setq p (point)) (point-max))
2119 ;; If I successfully read an integer (the plus zero ensures a numeric type), prepend a marker entry to the list
2120 (push (list (+ 0 (read (current-buffer))) nil nil (set-marker (make-marker) p)) dlist)
2122 (gnus-message 1 "gnus-agent-expire: read error occurred when reading expression at %s in %s. Skipping to next line." (point) nov-file)))
2123 ;; Whether I succeeded, or failed, it doesn't matter. Move to the next line then try again.
2125 (gnus-message 7 "gnus-agent-expire: Loading overview... Done"))
2126 (set-buffer-modified-p nil)
2128 ;; At this point, all of the information is in dlist. The only problem is that much of it is spread across multiple entries. Sort then MERGE!!
2129 (gnus-message 7 "gnus-agent-expire: Sorting entries... ")
2130 (let ((special 0) ; If two entries have the same article-number then sort by ascending keep_flag.
2136 (cond ((< (nth 0 a) (nth 0 b))
2138 ((> (nth 0 a) (nth 0 b))
2141 (let ((a (or (symbol-value (nth 2 a)) 3))
2142 (b (or (symbol-value (nth 2 b)) 3)))
2144 (gnus-message 7 "gnus-agent-expire: Sorting entries... Done")
2145 (gnus-message 7 "gnus-agent-expire: Merging entries... ")
2146 (let ((dlist dlist))
2147 (while (cdr dlist) ; I'm not at the end-of-list
2148 (if (eq (caar dlist) (caadr dlist))
2149 (let ((first (cdr (car dlist)))
2150 (secnd (cdr (cadr dlist))))
2151 (setcar first (or (car first) (car secnd))) ; fetch_date
2152 (setq first (cdr first)
2154 (setcar first (or (car first) (car secnd))) ; Keep_flag
2155 (setq first (cdr first)
2157 (setcar first (or (car first) (car secnd))) ; NOV_entry_marker
2159 (setcdr dlist (cddr dlist)))
2160 (setq dlist (cdr dlist)))))
2161 (gnus-message 7 "gnus-agent-expire: Merging entries... Done")
2163 (let* ((len (float (length dlist)))
2167 (let ((new-completed (* 100.0 (/ (setq cnt (1+ cnt)) len))))
2168 (when (> new-completed completed)
2169 (setq completed new-completed)
2170 (gnus-message 9 "%3d%% completed..." completed)))
2171 (let* ((entry (car dlist))
2172 (article-number (nth 0 entry))
2173 (fetch-date (nth 1 entry))
2174 (keep (nth 2 entry))
2175 (marker (nth 3 entry)))
2178 ;; Kept articles are unread, marked, or special.
2181 (unless (file-exists-p (concat dir (number-to-string article-number)))
2182 (setf (nth 1 entry) nil)
2183 (gnus-message 3 "gnus-agent-expire cleared download flag on article %d as the cached article file is missing." (caar dlist)))
2185 (gnus-message 1 "gnus-agent-expire detected a missing NOV entry. Run gnus-agent-regenerate-group to restore it.")))
2186 (gnus-agent-append-to-list tail-alist (cons article-number fetch-date)))
2188 ;; The following articles are READ, UNMARKED, and ORDINARY.
2189 ;; See if they can be EXPIRED!!!
2192 ((not (integerp fetch-date))
2193 'read) ;; never fetched article (may expire right now)
2194 ((not (file-exists-p (concat dir (number-to-string article-number))))
2195 (setf (nth 1 entry) nil)
2196 'externally-expired) ;; Can't find the cached article. Handle case as though this article was never fetched.
2198 ;; We now have the arrival day, so we see
2199 ;; whether it's old enough to be expired.
2204 (days gnus-agent-expire-days))
2205 (while (and (not found)
2207 (when (eq 0 (string-match (caar days) expiring-group))
2208 (setq found (cadar days)))
2215 ;; I found some reason to expire this entry.
2217 (let ((actions nil))
2218 (when (memq type '(forced expired))
2219 (ignore-errors ; Just being paranoid.
2220 (delete-file (concat dir (number-to-string article-number)))
2221 (push "expired cached article" actions))
2222 (setf (nth 1 entry) nil)
2226 (push "NOV entry removed" article)
2230 ;; If considering all articles is set, I can only expire article IDs that are no longer in the active range.
2231 (if (and gnus-agent-consider-all-articles
2232 (>= article-number (car active)))
2233 ;; I have to keep this ID in the alist
2234 (gnus-agent-append-to-list tail-alist (cons article-number fetch-date))
2235 (push (format "Removed %s article number from article alist" type) actions))
2237 (gnus-message 7 "gnus-agent-expire: Article %d: %s" article-number (mapconcat 'identity actions ", "))))
2240 ;; Clean up markers as I want to recycle this buffer over several groups.
2242 (set-marker marker nil))
2244 (setq dlist (cdr dlist))))
2246 (setq alist (cdr alist))
2248 (let ((inhibit-quit t))
2249 (unless (equal alist gnus-agent-article-alist)
2250 (setq gnus-agent-article-alist alist)
2251 (gnus-agent-save-alist expiring-group))
2253 (when (buffer-modified-p)
2254 (let ((coding-system-for-write
2255 gnus-agent-file-coding-system))
2256 (gnus-make-directory dir)
2257 (write-region (point-min) (point-max) nov-file nil 'silent)
2258 ;; clear the modified flag as that I'm not confused by its status on the next pass through this routine.
2259 (set-buffer-modified-p nil)))
2261 (when (eq articles t)
2262 (gnus-summary-update-info)))))))))))
2263 (kill-buffer overview)))))
2264 (gnus-message 4 "Expiry...done"))
2267 (defun gnus-agent-batch ()
2268 "Start Gnus, send queue and fetch session."
2270 (let ((init-file-user "")
2271 (gnus-always-read-dribble-file t))
2273 (let ((gnus-agent-confirmation-function 'gnus-agent-batch-confirmation))
2274 (gnus-group-send-queue)
2275 (gnus-agent-fetch-session)))
2277 (defun gnus-agent-unread-articles (group)
2278 (let* ((read (gnus-info-read (gnus-get-info group)))
2279 (known (gnus-agent-load-alist group))
2281 (tail-unread unread))
2282 (while (and known read)
2283 (let ((candidate (car (pop known))))
2284 (while (let* ((range (car read))
2285 (min (if (numberp range) range (car range)))
2286 (max (if (numberp range) range (cdr range))))
2287 (cond ((or (not min)
2289 (gnus-agent-append-to-list tail-unread candidate)
2294 (gnus-agent-append-to-list tail-unread (car (pop known))))
2297 (defun gnus-agent-uncached-articles (articles group &optional cached-header)
2298 "Constructs sublist of ARTICLES that excludes those articles ids in GROUP that have already been fetched.
2299 If CACHED-HEADER is nil, articles are only excluded if the article itself has been fetched."
2301 ;; Logically equivalent to: (gnus-sorted-difference articles (mapcar 'car gnus-agent-article-alist))
2302 ;; Functionally, I don't need to construct a temp list using mapcar.
2304 (if (gnus-agent-load-alist group)
2305 (let* ((ref gnus-agent-article-alist)
2307 (uncached (list nil))
2308 (tail-uncached uncached))
2309 (while (and ref arts)
2310 (let ((v1 (car arts))
2312 (cond ((< v1 v2) ; the article (v1) does not appear in the reference list
2313 (gnus-agent-append-to-list tail-uncached v1)
2316 (unless (or cached-header (cdar ref)) ; the article (v1) is already cached
2317 (gnus-agent-append-to-list tail-uncached v1))
2320 (t ; the reference article (v2) preceeds the list being filtered
2323 (gnus-agent-append-to-list tail-uncached (pop arts)))
2325 ;; if gnus-agent-load-alist fails, no articles are cached.
2328 (defun gnus-agent-retrieve-headers (articles group &optional fetch-old)
2330 (gnus-agent-create-buffer)
2331 (let ((gnus-decode-encoded-word-function 'identity)
2332 (file (gnus-agent-article-name ".overview" group))
2333 cached-articles uncached-articles)
2334 (gnus-make-directory (nnheader-translate-file-chars
2335 (file-name-directory file) t))
2337 ;; Populate temp buffer with known headers
2338 (when (file-exists-p file)
2339 (with-current-buffer gnus-agent-overview-buffer
2341 (let ((nnheader-file-coding-system
2342 gnus-agent-file-coding-system))
2343 (nnheader-insert-nov-file file (car articles)))))
2345 (if (setq uncached-articles (gnus-agent-uncached-articles articles group t))
2347 ;; Populate nntp-server-buffer with uncached headers
2348 (set-buffer nntp-server-buffer)
2350 (let (gnus-agent-cache) ; Turn off agent cache
2351 (cond ((not (eq 'nov (gnus-retrieve-headers
2352 uncached-articles group fetch-old)))
2353 (nnvirtual-convert-headers))
2354 ((eq 'nntp (car gnus-current-select-method))
2355 ;; The author of gnus-get-newsgroup-headers-xover reports that the XOVER command
2356 ;; is commonly unreliable. The problem is that recently posted articles may not
2357 ;; be entered into the NOV database in time to respond to my XOVER query.
2359 ;; I'm going to use his assumption that the NOV database is updated in order
2360 ;; of ascending article ID. Therefore, a response containing article ID N
2361 ;; implies that all articles from 1 to N-1 are up-to-date. Therefore,
2362 ;; missing articles in that range have expired.
2364 (set-buffer nntp-server-buffer)
2365 (let* ((fetched-articles (list nil))
2366 (tail-fetched-articles fetched-articles)
2367 (min (cond ((numberp fetch-old)
2368 (max 1 (- (car articles) fetch-old)))
2373 (max (car (last articles))))
2375 ;; Get the list of articles that were fetched
2376 (goto-char (point-min))
2379 (gnus-agent-append-to-list tail-fetched-articles (read (current-buffer)))
2382 ;; Clip this list to the headers that will actually be returned
2383 (setq fetched-articles (gnus-list-range-intersection
2384 (cdr fetched-articles)
2387 ;; Clip the uncached articles list to exclude IDs after the last FETCHED header.
2388 ;; The excluded IDs may be fetchable using HEAD.
2389 (if (car tail-fetched-articles)
2390 (setq uncached-articles (gnus-list-range-intersection
2392 (cons (car uncached-articles) (car tail-fetched-articles)))))
2394 ;; Create the list of articles that were "successfully" fetched. Success, in
2395 ;; this case, means that the ID should not be fetched again. In the case of
2396 ;; an expired article, the header will not be fetched.
2397 (setq uncached-articles (gnus-sorted-nunion fetched-articles uncached-articles))
2400 ;; Erase the temp buffer
2401 (set-buffer gnus-agent-overview-buffer)
2404 ;; Copy the nntp-server-buffer to the temp buffer
2405 (set-buffer nntp-server-buffer)
2406 (copy-to-buffer gnus-agent-overview-buffer (point-min) (point-max))
2408 ;; Merge the temp buffer with the known headers (found on disk in FILE) into the nntp-server-buffer
2409 (when (and uncached-articles (file-exists-p file))
2410 (gnus-agent-braid-nov group uncached-articles file))
2412 ;; Save the new set of known headers to FILE
2413 (set-buffer nntp-server-buffer)
2414 (let ((coding-system-for-write
2415 gnus-agent-file-coding-system))
2416 (gnus-agent-check-overview-buffer)
2417 (write-region (point-min) (point-max) file nil 'silent))
2419 ;; Update the group's article alist to include the newly fetched articles.
2420 (gnus-agent-load-alist group)
2421 (gnus-agent-save-alist group uncached-articles nil)
2424 ;; Copy the temp buffer to the nntp-server-buffer
2425 (set-buffer nntp-server-buffer)
2427 (insert-buffer-substring gnus-agent-overview-buffer)))
2430 (not (numberp fetch-old)))
2431 t ; Don't remove anything.
2432 (nnheader-nov-delete-outside-range
2433 (if fetch-old (max 1 (- (car articles) fetch-old))
2435 (car (last articles)))
2440 (defun gnus-agent-request-article (article group)
2441 "Retrieve ARTICLE in GROUP from the agent cache."
2442 (let* ((gnus-command-method (gnus-find-method-for-group group))
2444 (gnus-agent-directory)
2445 (gnus-agent-group-path group) "/"
2446 (number-to-string article)))
2447 (buffer-read-only nil))
2448 (when (and (file-exists-p file)
2449 (> (nth 7 (file-attributes file)) 0))
2451 (gnus-kill-all-overlays)
2452 (let ((coding-system-for-read gnus-cache-coding-system))
2453 (insert-file-contents file))
2456 (defun gnus-agent-regenerate-group (group &optional reread)
2457 "Regenerate GROUP. If REREAD is t, all articles in the .overview are marked as unread. If REREAD is not nil, downloaded articles are marked as unread."
2458 (gnus-message 5 "Regenerating in %s" group)
2459 (let* ((gnus-command-method (or gnus-command-method
2460 (gnus-find-method-for-group group)))
2461 (file (gnus-agent-article-name ".overview" group))
2462 (dir (file-name-directory file))
2464 (downloaded (if (file-exists-p dir)
2465 (sort (mapcar (lambda (name) (string-to-int name))
2466 (directory-files dir nil "^[0-9]+$" t))
2468 (progn (gnus-make-directory dir) nil)))
2473 (mm-with-unibyte-buffer
2474 (if (file-exists-p file)
2475 (let ((nnheader-file-coding-system
2476 gnus-agent-file-coding-system))
2477 (nnheader-insert-file-contents file)))
2478 (set-buffer-modified-p nil)
2480 ;; Load the article IDs found in the overview file. As a side-effect, validate the file contents.
2484 (goto-char (point-min))
2485 (while (< (point) (point-max))
2486 (cond ((looking-at "[0-9]+\t")
2487 (push (read (current-buffer)) nov-arts)
2489 (let ((l1 (car nov-arts))
2490 (l2 (cadr nov-arts)))
2494 (gnus-message 3 "gnus-agent-regenerate-group: NOV entries are NOT in ascending order.")
2495 ;; Don't sort now as I haven't verified that every line begins with a number
2499 (gnus-message 4 "gnus-agent-regenerate-group: NOV entries contained duplicate of article %s. Duplicate deleted." l1)
2503 (gnus-message 1 "gnus-agent-regenerate-group: NOV entries contained line that did not begin with an article number. Deleted line.")
2504 (gnus-delete-line))))
2507 (gnus-message 5 "gnus-agent-regenerate-group: Sorting NOV entries into ascending order.")
2508 (sort-numeric-fields 1 (point-min) (point-max))
2509 (setq nov-arts nil)))))
2510 (gnus-agent-check-overview-buffer)
2512 ;; Construct a new article alist whose nodes match every header in the .overview file.
2513 ;; As a side-effect, missing headers are reconstructed from the downloaded article file.
2514 (while (or downloaded nov-arts)
2515 (cond ((and downloaded
2517 (> (car downloaded) (car nov-arts))))
2518 ;; This entry is missing from the overview file
2519 (gnus-message 3 "Regenerating NOV %s %d..." group (car downloaded))
2520 (let ((file (concat dir (number-to-string (car downloaded)))))
2521 (mm-with-unibyte-buffer
2522 (nnheader-insert-file-contents file)
2523 (nnheader-remove-body)
2524 (setq header (nnheader-parse-naked-head)))
2525 (mail-header-set-number header (car downloaded))
2527 (let ((key (concat "^" (int-to-string (car nov-arts)) "\t")))
2528 (or (re-search-backward key nil t)
2529 (re-search-forward key))
2531 (goto-char (point-min)))
2532 (nnheader-insert-nov header))
2533 (setq nov-arts (cons (car downloaded) nov-arts)))
2534 ((eq (car downloaded) (car nov-arts))
2535 ;; This entry in the overview has been downloaded
2536 (push (cons (car downloaded) (time-to-days (nth 5 (file-attributes (concat dir (number-to-string (car downloaded))))))) alist)
2540 ;; This entry in the overview has not been downloaded
2541 (push (cons (car nov-arts) nil) alist)
2544 ;; When gnus-agent-consider-all-articles is set, gnus-agent-regenerate-group should NOT remove article IDs
2545 ;; from the alist. Those IDs serve as markers to indicate that an attempt has been made to fetch that
2546 ;; article's header.
2548 ;; When gnus-agent-consider-all-articles is NOT set, gnus-agent-regenerate-group can remove the article
2549 ;; ID of every article (with the exception of the last ID in the list - it's special) that no longer appears in the overview.
2550 ;; In this situtation, the last article ID in the list implies that it, and every article ID preceeding it,
2551 ;; have been fetched from the server.
2552 (if gnus-agent-consider-all-articles
2553 ;; Restore all article IDs that were not found in the overview file.
2554 (let* ((n (cons nil alist))
2556 (o (gnus-agent-load-alist group)))
2558 (let ((nID (caadr n))
2561 (setq n (setcdr n (list (list oID))))
2564 (setcdr n (cons (list oID) (cdr n)))
2571 (setq alist (cdr merged)))
2572 ;; Restore the last article ID if it is not already in the new alist
2573 (let ((n (last alist))
2574 (o (last (gnus-agent-load-alist group))))
2577 (push (cons (caar o) nil) alist)))
2578 ((< (caar n) (caar o))
2579 (setcdr n (list (car o)))))))
2581 (let ((inhibit-quit t))
2582 (if (setq regenerated (buffer-modified-p))
2583 (let ((coding-system-for-write gnus-agent-file-coding-system))
2584 (write-region (point-min) (point-max) file nil 'silent)))
2586 (setq regenerated (or regenerated
2587 (and reread gnus-agent-article-alist)
2588 (not (equal alist gnus-agent-article-alist)))
2591 (setq gnus-agent-article-alist alist)
2594 (gnus-agent-save-alist group)))
2597 (when (and reread gnus-agent-article-alist)
2598 (gnus-make-ascending-articles-unread
2600 (delq nil (mapcar (function (lambda (c)
2601 (cond ((eq reread t)
2605 gnus-agent-article-alist)))
2607 (when (gnus-buffer-live-p gnus-group-buffer)
2608 (gnus-group-update-group group t)
2615 (defun gnus-agent-regenerate (&optional clean reread)
2616 "Regenerate all agent covered files.
2617 If CLEAN, don't read existing active files."
2620 (gnus-message 4 "Regenerating Gnus agent files...")
2621 (dolist (gnus-command-method gnus-agent-covered-methods)
2622 (let ((active-file (gnus-agent-lib-file "active"))
2623 active-hashtb active-changed
2625 (gnus-make-directory (file-name-directory active-file))
2627 (setq active-hashtb (gnus-make-hashtable 1000))
2628 (mm-with-unibyte-buffer
2629 (if (file-exists-p active-file)
2630 (let ((nnheader-file-coding-system
2631 gnus-agent-file-coding-system))
2632 (nnheader-insert-file-contents active-file))
2633 (setq active-changed t))
2634 (gnus-active-to-gnus-format
2635 nil (setq active-hashtb
2636 (gnus-make-hashtable
2637 (count-lines (point-min) (point-max)))))))
2638 (dolist (group (gnus-groups-from-server gnus-command-method))
2639 (setq regenerated (or (gnus-agent-regenerate-group group reread)
2641 (let ((min (or (caar gnus-agent-article-alist) 1))
2642 (max (or (caar (last gnus-agent-article-alist)) 0))
2643 (active (gnus-gethash-safe (gnus-group-real-name group)
2645 (read (gnus-info-read (gnus-get-info group))))
2648 (setq active (cons min max)
2650 (gnus-sethash group active active-hashtb))
2651 (when (> (car active) min)
2653 (setq active-changed t))
2654 (when (< (cdr active) max)
2656 (setq active-changed t)))))
2657 (when active-changed
2658 (setq regenerated t)
2659 (gnus-message 4 "Regenerate %s" active-file)
2660 (let ((nnmail-active-file-coding-system gnus-agent-file-coding-system))
2661 (gnus-write-active-file active-file active-hashtb)))))
2662 (gnus-message 4 "Regenerating Gnus agent files...done")
2665 (defun gnus-agent-go-online (&optional force)
2666 "Switch servers into online status."
2667 (interactive (list t))
2668 (dolist (server gnus-opened-servers)
2669 (when (eq (nth 1 server) 'offline)
2670 (if (if (eq force 'ask)
2672 (format "Switch %s:%s into online status? "
2673 (caar server) (cadar server)))
2675 (setcar (nthcdr 1 server) 'close)))))
2677 (defun gnus-agent-toggle-group-plugged (group)
2678 "Toggle the status of the server of the current group."
2679 (interactive (list (gnus-group-group-name)))
2680 (let* ((method (gnus-find-method-for-group group))
2681 (status (cadr (assoc method gnus-opened-servers))))
2682 (if (eq status 'offline)
2683 (gnus-server-set-status method 'closed)
2684 (gnus-close-server method)
2685 (gnus-server-set-status method 'offline))
2686 (message "Turn %s:%s from %s to %s." (car method) (cadr method)
2687 (if (eq status 'offline) 'offline 'online)
2688 (if (eq status 'offline) 'online 'offline))))
2690 (defun gnus-agent-group-covered-p (group)
2691 (member (gnus-group-method group)
2692 gnus-agent-covered-methods))
2694 (provide 'gnus-agent)
2696 ;;; gnus-agent.el ends here