1 ;;; nndb.el --- nndb access for Gnus
3 ;; Copyright (C) 1997, 1998, 2000, 2003, 2004 Free Software Foundation, Inc.
5 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
6 ;; Kai Grossjohann <grossjohann@ls6.informatik.uni-dortmund.de>
7 ;; Joe Hildebrand <joe.hildebrand@ilg.com>
8 ;; David Blacka <davidb@rwhois.net>
11 ;; This file is part of GNU Emacs.
13 ;; GNU Emacs is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 ;; Boston, MA 02111-1307, USA.
30 ;;; This was based upon Kai Grossjohan's shamessly snarfed code and
31 ;;; further modified by Joe Hildebrand. It has been updated for Red
36 ;; * Fix bug where server connection can be lost and impossible to regain
37 ;; This hasn't happened to me in a while; think it was fixed in Rgnus
39 ;; * make it handle different nndb servers seemlessly
41 ;; * Optimize expire if FORCE
43 ;; * Optimize move (only expire once)
45 ;; * Deal with add/deletion of groups
47 ;; * make the backend TOUCH an article when marked as expireable (will
48 ;; make article expire 'expiry' days after that moment).
51 ;; Register nndb with known select methods.
53 (gnus-declare-backend "nndb" 'mail 'respool 'address 'prompt-address)
60 (eval-when-compile (require 'cl))
63 (unless (fboundp 'open-network-stream)
66 (eval-when-compile (require 'cl))
69 (autoload 'telnet-send-input "telnet" nil t)
70 (autoload 'gnus-declare-backend "gnus-start"))
72 ;; Declare nndb as derived from nntp
74 (nnoo-declare nndb nntp)
76 ;; Variables specific to nndb
78 ;;- currently not used but just in case...
79 (defvoo nndb-deliver-program "nndel"
80 "*The program used to put a message in an NNDB group.")
82 (defvoo nndb-server-side-expiry nil
83 "If t, expiry calculation will occur on the server side.")
85 (defvoo nndb-set-expire-date-on-mark nil
86 "If t, the expiry date for a given article will be set to the time
87 it was marked as expireable; otherwise the date will be the time the
88 article was posted to nndb")
90 ;; Variables copied from nntp
92 (defvoo nndb-server-opened-hook '(nntp-send-authinfo-from-file)
93 "Like nntp-server-opened-hook."
94 nntp-server-opened-hook)
96 (defvoo nndb-address "localhost"
97 "*The name of the NNDB server."
100 (defvoo nndb-port-number 9000
101 "*Port number to connect to."
104 ;; change to 'news if you are actually using nndb for news
105 (defvoo nndb-article-type 'mail)
107 (defvoo nndb-status-string nil "" nntp-status-string)
111 (defconst nndb-version "nndb 0.7"
112 "Version numbers of this version of NNDB.")
115 ;;; Interface functions.
117 (nnoo-define-basics nndb)
119 ;;------------------------------------------------------------------
121 ;; this function turns the lisp list into a string list. There is
122 ;; probably a more efficient way to do this.
123 (defun nndb-build-article-string (articles)
124 (let (art-string art)
126 (setq art (pop articles))
127 (setq art-string (concat art-string art " ")))
130 (defun nndb-build-expire-rest-list (total expire)
133 (setq art (pop total))
134 (if (memq art expire)
141 (deffoo nndb-request-type (group &optional article)
144 ;; nndb-request-update-info does not exist and is not needed
146 ;; nndb-request-update-mark does not exist; it should be used to TOUCH
147 ;; articles as they are marked exipirable
148 (defun nndb-touch-article (group article)
149 (nntp-send-command nil "X-TOUCH" article))
151 (deffoo nndb-request-update-mark
153 "Sets the expiry date for ARTICLE in GROUP to now, if the mark is 'E'"
154 (if (and nndb-set-expire-date-on-mark (string-equal mark "E"))
155 (nndb-touch-article group article))
158 ;; nndb-request-create-group -- currently this isn't necessary; nndb
159 ;; creates groups on demand.
161 ;; todo -- use some other time than the creation time of the article
162 ;; best is time since article has been marked as expirable
164 (defun nndb-request-expire-articles-local
165 (articles &optional group server force)
166 "Let gnus do the date check and issue the delete commands."
167 (let (msg art delete-list (num-delete 0) rest)
168 (nntp-possibly-change-group group server)
170 (setq art (pop articles))
171 (nntp-send-command "^\\([23]\\|^423\\).*\n" "X-DATE" art)
172 (setq msg (nndb-status-message))
173 (if (string-match "^423" msg)
175 (or (string-match "'\\(.+\\)'" msg)
176 (error "Not a valid response for X-DATE command: %s"
178 (if (nnmail-expired-article-p
180 (date-to-time (substring msg (match-beginning 1) (match-end 1)))
183 (setq delete-list (concat delete-list " " (int-to-string art)))
184 (setq num-delete (1+ num-delete)))
186 (if (> (length delete-list) 0)
188 (nnheader-message 5 "Deleting %s article(s) from %s"
189 (int-to-string num-delete) group)
190 (nntp-send-command "^[23].*\n" "X-DELETE" delete-list))
193 (nnheader-message 5 "")
194 (nconc rest articles)))
196 (defun nndb-get-remote-expire-response ()
198 (set-buffer nntp-server-buffer)
199 (goto-char (point-min))
200 (if (looking-at "^[34]")
201 ;; x-expire returned error--presume no articles were expirable)
203 ;; otherwise, pull all of the following numbers into the list
204 (re-search-forward "follows\r?\n?" nil t)
205 (while (re-search-forward "^[0-9]+$" nil t)
206 (push (string-to-int (match-string 0)) list)))
209 (defun nndb-request-expire-articles-remote
210 (articles &optional group server force)
211 "Let the nndb backend expire articles"
212 (let (days art-string delete-list (num-delete 0))
213 (nntp-possibly-change-group group server)
215 ;; first calculate the wait period in days
216 (setq days (or (and nnmail-expiry-wait-function
217 (funcall nnmail-expiry-wait-function group))
219 ;; now handle the special cases
223 ;; This isn't an expirable group.
225 ((eq days 'immediate)
229 ;; build article string
230 (setq art-string (concat days " " (nndb-build-article-string articles)))
231 (nntp-send-command "^\.\r?\n\\|^[345].*\n" "X-EXPIRE" art-string)
233 (setq delete-list (nndb-get-remote-expire-response))
234 (setq num-delete (length delete-list))
236 (nnheader-message 5 "Deleting %s article(s) from %s"
237 (int-to-string num-delete) group))
239 (nndb-build-expire-rest-list articles delete-list)))
241 (deffoo nndb-request-expire-articles
242 (articles &optional group server force)
243 "Expires ARTICLES from GROUP on SERVER.
244 If FORCE, delete regardless of exiration date, otherwise use normal
246 (if nndb-server-side-expiry
247 (nndb-request-expire-articles-remote articles group server force)
248 (nndb-request-expire-articles-local articles group server force)))
250 (deffoo nndb-request-move-article
251 (article group server accept-form &optional last)
252 "Move ARTICLE (a number) from GROUP on SERVER.
253 Evals ACCEPT-FORM in current buffer, where the article is.
254 Optional LAST is ignored."
255 ;; we guess that the second arg in accept-form is the new group,
256 ;; which it will be for nndb, which is all that matters anyway
257 (let ((new-group (nth 1 accept-form)) result)
258 (nntp-possibly-change-group group server)
260 ;; use the move command for nndb-to-nndb moves
261 (if (string-match "^nndb" new-group)
262 (let ((new-group-name (gnus-group-real-name new-group)))
263 (nntp-send-command "^[23].*\n" "X-MOVE" article new-group-name)
264 (cons new-group article))
265 ;; else move normally
266 (let ((artbuf (get-buffer-create " *nndb move*")))
268 (nndb-request-article article group server artbuf)
271 (insert-buffer-substring nntp-server-buffer)
272 (setq result (eval accept-form))
273 (kill-buffer (current-buffer))
275 (nndb-request-expire-articles (list article)
282 (deffoo nndb-request-accept-article (group server &optional last)
283 "The article in the current buffer is put into GROUP."
284 (nntp-possibly-change-group group server)
286 (when (nntp-send-command "^[23].*\r?\n" "ACCEPT" group)
288 (nntp-send-buffer "^[23].*\n"))
290 (set-buffer nntp-server-buffer)
291 (setq msg (buffer-string))
292 (or (string-match "^\\([0-9]+\\)" msg)
293 (error "nndb: %s" msg))
294 (setq art (substring msg (match-beginning 1) (match-end 1)))
295 (nnheader-message 5 "nndb: accepted %s" art)
298 (deffoo nndb-request-replace-article (article group buffer)
299 "ARTICLE is the number of the article in GROUP to be replaced with the contents of the BUFFER."
301 (when (nntp-send-command "^[23].*\r?\n" "X-REPLACE" (int-to-string article))
303 (nntp-send-buffer "^[23.*\n")
304 (list (int-to-string article))))
306 ; nndb-request-delete-group does not exist
307 ; todo -- maybe later
309 ; nndb-request-rename-group does not exist
310 ; todo -- maybe later
312 ;; -- standard compatability functions
314 (deffoo nndb-status-message (&optional server)
315 "Return server status as a string."
316 (set-buffer nntp-server-buffer)
319 ;; Import stuff from nntp
326 ;;; nndb.el ends here