Merge from gnus--rel--5.10
[gnus] / lisp / nnspool.el
1 ;;; nnspool.el --- spool access for GNU Emacs
2
3 ;; Copyright (C) 1988, 1989, 1990, 1993, 1994, 1995, 1996, 1997, 1998,
4 ;;   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
5
6 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
7 ;;      Lars Magne Ingebrigtsen <larsi@gnus.org>
8 ;; Keywords: news
9
10 ;; This file is part of GNU Emacs.
11
12 ;; GNU Emacs is free software; you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation; either version 3, or (at your option)
15 ;; any later version.
16
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20 ;; GNU General Public License for more details.
21
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
25 ;; Boston, MA 02110-1301, USA.
26
27 ;;; Commentary:
28
29 ;;; Code:
30
31 (require 'nnheader)
32 (require 'nntp)
33 (require 'nnoo)
34 (eval-when-compile (require 'cl))
35
36 (nnoo-declare nnspool)
37
38 (defvoo nnspool-inews-program news-inews-program
39   "Program to post news.
40 This is most commonly `inews' or `injnews'.")
41
42 (defvoo nnspool-inews-switches '("-h" "-S")
43   "Switches for nnspool-request-post to pass to `inews' for posting news.
44 If you are using Cnews, you probably should set this variable to nil.")
45
46 (defvoo nnspool-spool-directory
47     (file-name-as-directory (if (boundp 'news-directory)
48                                 (symbol-value 'news-directory)
49                               news-path))
50   "Local news spool directory.")
51
52 (defvoo nnspool-nov-directory (concat nnspool-spool-directory "over.view/")
53   "Local news nov directory.")
54
55 (defvoo nnspool-lib-dir
56     (if (file-exists-p "/usr/lib/news/active")
57         "/usr/lib/news/"
58       "/var/lib/news/")
59   "Where the local news library files are stored.")
60
61 (defvoo nnspool-active-file (concat nnspool-lib-dir "active")
62   "Local news active file.")
63
64 (defvoo nnspool-newsgroups-file (concat nnspool-lib-dir "newsgroups")
65   "Local news newsgroups file.")
66
67 (defvoo nnspool-distributions-file (concat nnspool-lib-dir "distribs.pat")
68   "Local news distributions file.")
69
70 (defvoo nnspool-history-file (concat nnspool-lib-dir "history")
71   "Local news history file.")
72
73 (defvoo nnspool-active-times-file (concat nnspool-lib-dir "active.times")
74   "Local news active date file.")
75
76 (defvoo nnspool-large-newsgroup 50
77   "The number of articles which indicates a large newsgroup.
78 If the number of articles is greater than the value, verbose
79 messages will be shown to indicate the current status.")
80
81 (defvoo nnspool-nov-is-evil nil
82   "Non-nil means that nnspool will never return NOV lines instead of headers.")
83
84 (defconst nnspool-sift-nov-with-sed nil
85   "If non-nil, use sed to get the relevant portion from the overview file.
86 If nil, nnspool will load the entire file into a buffer and process it
87 there.")
88
89 (defvoo nnspool-rejected-article-hook nil
90   "*A hook that will be run when an article has been rejected by the server.")
91
92 (defvoo nnspool-file-coding-system nnheader-file-coding-system
93   "Coding system for nnspool.")
94
95 \f
96
97 (defconst nnspool-version "nnspool 2.0"
98   "Version numbers of this version of NNSPOOL.")
99
100 (defvoo nnspool-current-directory nil
101   "Current news group directory.")
102
103 (defvoo nnspool-current-group nil)
104 (defvoo nnspool-status-string "")
105
106 \f
107 ;;; Interface functions.
108
109 (nnoo-define-basics nnspool)
110
111 (deffoo nnspool-retrieve-headers (articles &optional group server fetch-old)
112   "Retrieve the headers of ARTICLES."
113   (save-excursion
114     (set-buffer nntp-server-buffer)
115     (erase-buffer)
116     (when (nnspool-possibly-change-directory group)
117       (let* ((number (length articles))
118              (count 0)
119              (default-directory nnspool-current-directory)
120              (do-message (and (numberp nnspool-large-newsgroup)
121                               (> number nnspool-large-newsgroup)))
122              (nnheader-file-coding-system nnspool-file-coding-system)
123              file beg article ag)
124         (if (and (numberp (car articles))
125                  (nnspool-retrieve-headers-with-nov articles fetch-old))
126             ;; We successfully retrieved the NOV headers.
127             'nov
128           ;; No NOV headers here, so we do it the hard way.
129           (while (setq article (pop articles))
130             (if (stringp article)
131                 ;; This is a Message-ID.
132                 (setq ag (nnspool-find-id article)
133                       file (and ag (nnspool-article-pathname
134                                     (car ag) (cdr ag)))
135                       article (cdr ag))
136               ;; This is an article in the current group.
137               (setq file (int-to-string article)))
138             ;; Insert the head of the article.
139             (when (and file
140                        (file-exists-p file))
141               (insert "221 ")
142               (princ article (current-buffer))
143               (insert " Article retrieved.\n")
144               (setq beg (point))
145               (inline (nnheader-insert-head file))
146               (goto-char beg)
147               (if (search-forward "\n\n" nil t)
148                   (progn
149                     (forward-char -1)
150                     (insert ".\n"))
151                 (goto-char (point-max))
152                 (if (bolp)
153                     (insert ".\n")
154                   (insert "\n.\n")))
155               (delete-region (point) (point-max)))
156
157             (and do-message
158                  (zerop (% (incf count) 20))
159                  (nnheader-message 5 "nnspool: Receiving headers... %d%%"
160                                    (/ (* count 100) number))))
161
162           (when do-message
163             (nnheader-message 5 "nnspool: Receiving headers...done"))
164
165           ;; Fold continuation lines.
166           (nnheader-fold-continuation-lines)
167           'headers)))))
168
169 (deffoo nnspool-open-server (server &optional defs)
170   (nnoo-change-server 'nnspool server defs)
171   (cond
172    ((not (file-exists-p nnspool-spool-directory))
173     (nnspool-close-server)
174     (nnheader-report 'nnspool "Spool directory doesn't exist: %s"
175                      nnspool-spool-directory))
176    ((not (file-directory-p
177           (directory-file-name
178            (file-truename nnspool-spool-directory))))
179     (nnspool-close-server)
180     (nnheader-report 'nnspool "Not a directory: %s" nnspool-spool-directory))
181    ((not (file-exists-p nnspool-active-file))
182     (nnheader-report 'nnspool "The active file doesn't exist: %s"
183                      nnspool-active-file))
184    (t
185     (nnheader-report 'nnspool "Opened server %s using directory %s"
186                      server nnspool-spool-directory)
187     t)))
188
189 (deffoo nnspool-request-article (id &optional group server buffer)
190   "Select article by message ID (or number)."
191   (nnspool-possibly-change-directory group)
192   (let ((nntp-server-buffer (or buffer nntp-server-buffer))
193         file ag)
194     (if (stringp id)
195         ;; This is a Message-ID.
196         (when (setq ag (nnspool-find-id id))
197           (setq file (nnspool-article-pathname (car ag) (cdr ag))))
198       (setq file (nnspool-article-pathname nnspool-current-group id)))
199     (and file
200          (file-exists-p file)
201          (not (file-directory-p file))
202          (save-excursion (nnspool-find-file file))
203          ;; We return the article number and group name.
204          (if (numberp id)
205              (cons nnspool-current-group id)
206            ag))))
207
208 (deffoo nnspool-request-body (id &optional group server)
209   "Select article body by message ID (or number)."
210   (nnspool-possibly-change-directory group)
211   (let ((res (nnspool-request-article id)))
212     (when res
213       (save-excursion
214         (set-buffer nntp-server-buffer)
215         (goto-char (point-min))
216         (when (search-forward "\n\n" nil t)
217           (delete-region (point-min) (point)))
218         res))))
219
220 (deffoo nnspool-request-head (id &optional group server)
221   "Select article head by message ID (or number)."
222   (nnspool-possibly-change-directory group)
223   (let ((res (nnspool-request-article id)))
224     (when res
225       (save-excursion
226         (set-buffer nntp-server-buffer)
227         (goto-char (point-min))
228         (when (search-forward "\n\n" nil t)
229           (delete-region (1- (point)) (point-max)))
230         (nnheader-fold-continuation-lines)))
231     res))
232
233 (deffoo nnspool-request-group (group &optional server dont-check)
234   "Select news GROUP."
235   (let ((pathname (nnspool-article-pathname group))
236         dir)
237     (if (not (file-directory-p pathname))
238         (nnheader-report
239          'nnspool "Invalid group name (no such directory): %s" group)
240       (setq nnspool-current-directory pathname)
241       (nnheader-report 'nnspool "Selected group %s" group)
242       (if dont-check
243           (progn
244             (nnheader-report 'nnspool "Selected group %s" group)
245             t)
246         ;; Yes, completely empty spool directories *are* possible.
247         ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>
248         (when (setq dir (directory-files pathname nil "^[0-9]+$" t))
249           (setq dir (sort (mapcar 'string-to-number dir) '<)))
250         (if dir
251             (nnheader-insert
252              "211 %d %d %d %s\n" (length dir) (car dir)
253              (car (last dir)) group)
254           (nnheader-report 'nnspool "Empty group %s" group)
255           (nnheader-insert "211 0 0 0 %s\n" group))))))
256
257 (deffoo nnspool-request-type (group &optional article)
258   'news)
259
260 (deffoo nnspool-close-group (group &optional server)
261   t)
262
263 (deffoo nnspool-request-list (&optional server)
264   "List active newsgroups."
265   (save-excursion
266     (or (nnspool-find-file nnspool-active-file)
267         (nnheader-report 'nnspool (nnheader-file-error nnspool-active-file)))))
268
269 (deffoo nnspool-request-list-newsgroups (&optional server)
270   "List newsgroups (defined in NNTP2)."
271   (save-excursion
272     (or (nnspool-find-file nnspool-newsgroups-file)
273         (nnheader-report 'nnspool (nnheader-file-error
274                                    nnspool-newsgroups-file)))))
275
276 (deffoo nnspool-request-list-distributions (&optional server)
277   "List distributions (defined in NNTP2)."
278   (save-excursion
279     (or (nnspool-find-file nnspool-distributions-file)
280         (nnheader-report 'nnspool (nnheader-file-error
281                                    nnspool-distributions-file)))))
282
283 ;; Suggested by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
284 (deffoo nnspool-request-newgroups (date &optional server)
285   "List groups created after DATE."
286   (if (nnspool-find-file nnspool-active-times-file)
287       (save-excursion
288         ;; Find the last valid line.
289         (goto-char (point-max))
290         (while (and (not (looking-at
291                           "\\([^ ]+\\) +\\([0-9]+\\)[0-9][0-9][0-9] "))
292                     (zerop (forward-line -1))))
293         (let ((seconds (time-to-seconds (date-to-time date)))
294               groups)
295           ;; Go through lines and add the latest groups to a list.
296           (while (and (looking-at "\\([^ ]+\\) +[0-9]+ ")
297                       (progn
298                         ;; We insert a .0 to make the list reader
299                         ;; interpret the number as a float.  It is far
300                         ;; too big to be stored in a lisp integer.
301                         (goto-char (1- (match-end 0)))
302                         (insert ".0")
303                         (> (progn
304                              (goto-char (match-end 1))
305                              (read (current-buffer)))
306                            seconds))
307                       (push (buffer-substring
308                              (match-beginning 1) (match-end 1))
309                             groups)
310                       (zerop (forward-line -1))))
311           (erase-buffer)
312           (dolist (group groups)
313             (insert group " 0 0 y\n")))
314         t)
315     nil))
316
317 (deffoo nnspool-request-post (&optional server)
318   "Post a new news in current buffer."
319   (save-excursion
320     (let* ((process-connection-type nil) ; t bugs out on Solaris
321            (inews-buffer (generate-new-buffer " *nnspool post*"))
322            (proc
323             (condition-case err
324                 (apply 'start-process "*nnspool inews*" inews-buffer
325                        nnspool-inews-program nnspool-inews-switches)
326               (error
327                (nnheader-report 'nnspool "inews error: %S" err)))))
328       (if (not proc)
329           ;; The inews program failed.
330           ()
331         (nnheader-report 'nnspool "")
332         (set-process-sentinel proc 'nnspool-inews-sentinel)
333         (mm-with-unibyte-current-buffer
334           (process-send-region proc (point-min) (point-max)))
335         ;; We slap a condition-case around this, because the process may
336         ;; have exited already...
337         (ignore-errors
338           (process-send-eof proc))
339         t))))
340
341
342 \f
343 ;;; Internal functions.
344
345 (defun nnspool-inews-sentinel (proc status)
346   (save-excursion
347     (set-buffer (process-buffer proc))
348     (goto-char (point-min))
349     (if (or (zerop (buffer-size))
350             (search-forward "spooled" nil t))
351         (kill-buffer (current-buffer))
352       ;; Make status message by folding lines.
353       (while (re-search-forward "[ \t\n]+" nil t)
354         (replace-match " " t t))
355       (nnheader-report 'nnspool "%s" (buffer-string))
356       (nnheader-message 5 "nnspool: %s" nnspool-status-string)
357       (ding)
358       (run-hooks 'nnspool-rejected-article-hook))))
359
360 (defun nnspool-retrieve-headers-with-nov (articles &optional fetch-old)
361   (if (or gnus-nov-is-evil nnspool-nov-is-evil)
362       nil
363     (let ((nov (nnheader-group-pathname
364                 nnspool-current-group nnspool-nov-directory ".overview"))
365           (arts articles)
366           (nnheader-file-coding-system nnspool-file-coding-system)
367           last)
368       (if (not (file-exists-p nov))
369           ()
370         (save-excursion
371           (set-buffer nntp-server-buffer)
372           (erase-buffer)
373           (if nnspool-sift-nov-with-sed
374               (nnspool-sift-nov-with-sed articles nov)
375             (nnheader-insert-file-contents nov)
376             (if (and fetch-old
377                      (not (numberp fetch-old)))
378                 t                       ; We want all the headers.
379               (ignore-errors
380                 ;; Delete unwanted NOV lines.
381                 (nnheader-nov-delete-outside-range
382                  (if fetch-old (max 1 (- (car articles) fetch-old))
383                    (car articles))
384                  (car (last articles)))
385                 ;; If the buffer is empty, this wasn't very successful.
386                 (unless (zerop (buffer-size))
387                   ;; We check what the last article number was.
388                   ;; The NOV file may be out of sync with the articles
389                   ;; in the group.
390                   (forward-line -1)
391                   (setq last (read (current-buffer)))
392                   (if (= last (car articles))
393                       ;; Yup, it's all there.
394                       t
395                     ;; Perhaps not.  We try to find the missing articles.
396                     (while (and arts
397                                 (<= last (car arts)))
398                       (pop arts))
399                     ;; The articles in `arts' are missing from the buffer.
400                     (mapc 'nnspool-insert-nov-head arts)
401                     t))))))))))
402
403 (defun nnspool-insert-nov-head (article)
404   "Read the head of ARTICLE, convert to NOV headers, and insert."
405   (save-excursion
406     (let ((cur (current-buffer))
407           buf)
408       (setq buf (nnheader-set-temp-buffer " *nnspool head*"))
409       (when (nnheader-insert-head
410              (nnspool-article-pathname nnspool-current-group article))
411         (nnheader-insert-article-line article)
412         (let ((headers (nnheader-parse-head)))
413           (set-buffer cur)
414           (goto-char (point-max))
415           (nnheader-insert-nov headers)))
416       (kill-buffer buf))))
417
418 (defun nnspool-sift-nov-with-sed (articles file)
419   (let ((first (car articles))
420         (last (car (last articles))))
421     (call-process "awk" nil t nil
422                   (format "BEGIN {firstmsg=%d; lastmsg=%d;}\n $1 >= firstmsg && $1 <= lastmsg {print;}"
423                           (1- first) (1+ last))
424                   file)))
425
426 ;; Fixed by fdc@cliwe.ping.de (Frank D. Cringle).
427 ;; Find out what group an article identified by a Message-ID is in.
428 (defun nnspool-find-id (id)
429   (with-temp-buffer
430     (ignore-errors
431       (call-process "grep" nil t nil (regexp-quote id) nnspool-history-file))
432     (goto-char (point-min))
433     (when (looking-at "<[^>]+>[ \t]+[-0-9~]+[ \t]+\\([^ /\t\n]+\\)/\\([0-9]+\\)[ \t\n]")
434       (cons (match-string 1) (string-to-number (match-string 2))))))
435
436 (defun nnspool-find-file (file)
437   "Insert FILE in server buffer safely."
438   (set-buffer nntp-server-buffer)
439   (erase-buffer)
440   (condition-case ()
441       (let ((coding-system-for-read nnspool-file-coding-system))
442         (mm-insert-file-contents file)
443         t)
444     (file-error nil)))
445
446 (defun nnspool-possibly-change-directory (group)
447   (if (not group)
448       t
449     (let ((pathname (nnspool-article-pathname group)))
450       (if (file-directory-p pathname)
451           (setq nnspool-current-directory pathname
452                 nnspool-current-group group)
453         (nnheader-report 'nnspool "No such newsgroup: %s" group)))))
454
455 (defun nnspool-article-pathname (group &optional article)
456   "Find the file name for GROUP."
457   (nnheader-group-pathname group nnspool-spool-directory article))
458
459 (provide 'nnspool)
460
461 ;;; arch-tag: bdac8d27-2934-4eee-bad0-49e6b90c0d05
462 ;;; nnspool.el ends here