parse-time.el: Use cl-lib as much as possible following the 2014-09-26 change in...
[gnus] / lisp / nndraft.el
1 ;;; nndraft.el --- draft article access for Gnus
2
3 ;; Copyright (C) 1995-2014 Free Software Foundation, Inc.
4
5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
6 ;; Keywords: news
7
8 ;; This file is part of GNU Emacs.
9
10 ;; GNU Emacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
14
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 ;; GNU General Public License for more details.
19
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
22
23 ;;; Commentary:
24
25 ;;; Code:
26
27 (require 'nnheader)
28 (require 'nnmail)
29 (require 'gnus-start)
30 (require 'gnus-group)
31 (require 'nnmh)
32 (require 'nnoo)
33 (require 'mm-util)
34 (eval-when-compile (require 'cl))
35
36 ;; The nnoo-import at the end, I think.
37 (declare-function nndraft-request-list "nndraft" (&rest args) t)
38
39 (nnoo-declare nndraft
40   nnmh)
41
42 (defvoo nndraft-directory (nnheader-concat gnus-directory "drafts/")
43   "Where nndraft will store its files."
44   nnmh-directory)
45
46 (defvar nndraft-required-headers '(Date)
47   "*Headers to be generated when saving a draft message.
48 The headers in this variable and the ones in `message-required-headers'
49 are generated if and only if they are also in `message-draft-headers'.")
50
51 \f
52
53 (defvoo nndraft-current-group "" nil nnmh-current-group)
54 (defvoo nndraft-get-new-mail nil nil nnmh-get-new-mail)
55 (defvoo nndraft-current-directory nil nil nnmh-current-directory)
56
57 (defconst nndraft-version "nndraft 1.0")
58 (defvoo nndraft-status-string "" nil nnmh-status-string)
59
60 \f
61
62 ;;; Interface functions.
63
64 (nnoo-define-basics nndraft)
65
66 (deffoo nndraft-open-server (server &optional defs)
67   (nnoo-change-server 'nndraft server defs)
68   (cond
69    ((not (file-exists-p nndraft-directory))
70     (nndraft-close-server)
71     (nnheader-report 'nndraft "No such file or directory: %s"
72                      nndraft-directory))
73    ((not (file-directory-p (file-truename nndraft-directory)))
74     (nndraft-close-server)
75     (nnheader-report 'nndraft "Not a directory: %s" nndraft-directory))
76    (t
77     (nnheader-report 'nndraft "Opened server %s using directory %s"
78                      server nndraft-directory)
79     t)))
80
81 (deffoo nndraft-retrieve-headers (articles &optional group server fetch-old)
82   (nndraft-possibly-change-group group)
83   (with-current-buffer nntp-server-buffer
84     (erase-buffer)
85     (let (article lines chars)
86       ;; We don't support fetching by Message-ID.
87       (if (stringp (car articles))
88           'headers
89         (while articles
90           (narrow-to-region (point) (point))
91           (when (nndraft-request-article
92                  (setq article (pop articles)) group server (current-buffer))
93             (goto-char (point-min))
94             (if (search-forward "\n\n" nil t)
95                 (forward-line -1)
96               (goto-char (point-max)))
97             (setq lines (count-lines (point) (point-max))
98                   chars (- (point-max) (point)))
99             (delete-region (point) (point-max))
100             (goto-char (point-min))
101             (insert (format "221 %d Article retrieved.\n" article))
102             (insert (format "Lines: %d\nChars: %d\n" lines chars))
103             (widen)
104             (goto-char (point-max))
105             (insert ".\n")))
106
107         (nnheader-fold-continuation-lines)
108         'headers))))
109
110 (deffoo nndraft-request-article (id &optional group server buffer)
111   (nndraft-possibly-change-group group)
112   (when (numberp id)
113     ;; We get the newest file of the auto-saved file and the
114     ;; "real" file.
115     (let* ((file (nndraft-article-filename id))
116            (auto (nndraft-auto-save-file-name file))
117            (newest (if (file-newer-than-file-p file auto) file auto))
118            (nntp-server-buffer (or buffer nntp-server-buffer)))
119       (when (and (file-exists-p newest)
120                  (let ((nnmail-file-coding-system
121                         (if (file-newer-than-file-p file auto)
122                             (if (member group '("drafts" "delayed"))
123                                 message-draft-coding-system
124                               mm-text-coding-system)
125                           mm-auto-save-coding-system)))
126                    (nnmail-find-file newest)))
127         (with-current-buffer nntp-server-buffer
128           (goto-char (point-min))
129           ;; If there's a mail header separator in this file,
130           ;; we remove it.
131           (when (re-search-forward
132                  (concat "^" (regexp-quote mail-header-separator) "$") nil t)
133             (replace-match "" t t)))
134         t))))
135
136 (deffoo nndraft-request-restore-buffer (article &optional group server)
137   "Request a new buffer that is restored to the state of ARTICLE."
138   (nndraft-possibly-change-group group)
139   (when (nndraft-request-article article group server (current-buffer))
140     (message-remove-header "xref")
141     (message-remove-header "lines")
142     ;; Articles in nndraft:queue are considered as sent messages.  The
143     ;; Date field should be the time when they are sent.
144     ;;(message-remove-header "date")
145     t))
146
147 (deffoo nndraft-request-update-info (group info &optional server)
148   (nndraft-possibly-change-group group)
149   (gnus-info-set-read
150    info
151    (gnus-update-read-articles (gnus-group-prefixed-name group '(nndraft ""))
152                               (nndraft-articles) t))
153   (let ((marks (nth 3 info)))
154     (when marks
155       ;; Nix out all marks except the `unsend'-able article marks.
156       (setcar (nthcdr 3 info)
157               (if (assq 'unsend marks)
158                   (list (assq 'unsend marks))
159                 nil))))
160   t)
161
162 (defun nndraft-generate-headers ()
163   (save-excursion
164     (message-generate-headers
165      (message-headers-to-generate
166       nndraft-required-headers message-draft-headers nil))))
167
168 (defun nndraft-update-unread-articles ()
169   "Update groups' unread articles in the group buffer."
170   (nndraft-request-list)
171   (with-current-buffer gnus-group-buffer
172     (let* ((groups (mapcar (lambda (elem)
173                              (gnus-group-prefixed-name (car elem)
174                                                        (list 'nndraft "")))
175                            (nnmail-get-active)))
176            (gnus-group-marked (copy-sequence groups))
177            ;; Don't send delayed articles.
178            (gnus-get-new-news-hook nil)
179            (inhibit-read-only t))
180       (gnus-group-get-new-news-this-group nil t)
181       (save-excursion
182         (dolist (group groups)
183           (unless (and gnus-permanently-visible-groups
184                        (string-match gnus-permanently-visible-groups
185                                      group))
186             (gnus-group-goto-group group)
187             (when (zerop (gnus-group-group-unread))
188               (gnus-delete-line))))))))
189
190 (deffoo nndraft-request-associate-buffer (group)
191   "Associate the current buffer with some article in the draft group."
192   (nndraft-open-server "")
193   (nndraft-request-group group)
194   (nndraft-possibly-change-group group)
195   (let ((gnus-verbose-backends nil)
196         (buf (current-buffer))
197         article file)
198     (with-temp-buffer
199       (insert-buffer-substring buf)
200       (setq article (nndraft-request-accept-article
201                      group (nnoo-current-server 'nndraft) t 'noinsert)
202             file (nndraft-article-filename article)))
203     (setq buffer-file-name (expand-file-name file)
204           buffer-auto-save-file-name (make-auto-save-file-name))
205     (clear-visited-file-modtime)
206     (let ((hook (if (boundp 'write-contents-functions)
207                     'write-contents-functions
208                   'write-contents-hooks)))
209       (gnus-make-local-hook hook)
210       (add-hook hook 'nndraft-generate-headers nil t))
211     (gnus-make-local-hook 'after-save-hook)
212     (add-hook 'after-save-hook 'nndraft-update-unread-articles nil t)
213     (message-add-action '(nndraft-update-unread-articles)
214                         'exit 'postpone 'kill)
215     article))
216
217 (deffoo nndraft-request-group (group &optional server dont-check info)
218   (nndraft-possibly-change-group group)
219   (unless dont-check
220     (let* ((pathname (nnmail-group-pathname group nndraft-directory))
221            (file-name-coding-system nnmail-pathname-coding-system)
222            dir file)
223       (nnheader-re-read-dir pathname)
224       (setq dir (mapcar (lambda (name) (string-to-number (substring name 1)))
225                         (ignore-errors (directory-files
226                                         pathname nil "^#[0-9]+#$" t))))
227       (dolist (n dir)
228         (unless (file-exists-p
229                  (setq file (expand-file-name (int-to-string n) pathname)))
230           (rename-file (nndraft-auto-save-file-name file) file)))))
231   (nnoo-parent-function 'nndraft
232                         'nnmh-request-group
233                         (list group server dont-check)))
234
235 (deffoo nndraft-request-move-article (article group server accept-form
236                                       &optional last move-is-internal)
237   (nndraft-possibly-change-group group)
238   (let ((buf (get-buffer-create " *nndraft move*"))
239         result)
240     (and
241      (nndraft-request-article article group server)
242      (with-current-buffer buf
243        (erase-buffer)
244        (insert-buffer-substring nntp-server-buffer)
245        (setq result (eval accept-form))
246        (kill-buffer (current-buffer))
247        result)
248      (null (nndraft-request-expire-articles (list article) group server 'force))
249      result)))
250
251 (deffoo nndraft-request-expire-articles (articles group &optional server force)
252   (nndraft-possibly-change-group group)
253   (let* ((nnmh-allow-delete-final t)
254          (nnmail-expiry-target 'delete)
255          ;; FIXME: If we want to move a draft message to an expiry group,
256          ;; there are things to have to improve:
257          ;; - Remove a header separator.
258          ;; - Encode it, including attachments, into a MIME message.
259          ;;(nnmail-expiry-target
260          ;; (or (gnus-group-find-parameter
261          ;;      (gnus-group-prefixed-name group (list 'nndraft server))
262          ;;      'expiry-target t)
263          ;;     nnmail-expiry-target))
264          (res (nnoo-parent-function 'nndraft
265                                     'nnmh-request-expire-articles
266                                     (list articles group server force)))
267          article)
268     ;; Delete all the "state" files of articles that have been expired.
269     (while articles
270       (unless (memq (setq article (pop articles)) res)
271         (let ((auto (nndraft-auto-save-file-name
272                      (nndraft-article-filename article))))
273           (when (file-exists-p auto)
274             (funcall nnmail-delete-file-function auto)))
275         (dolist (backup
276                  (let ((kept-new-versions 1)
277                        (kept-old-versions 0))
278                    (find-backup-file-name
279                     (nndraft-article-filename article))))
280           (when (file-exists-p backup)
281             (funcall nnmail-delete-file-function backup)))))
282     res))
283
284 (deffoo nndraft-request-accept-article (group &optional server last noinsert)
285   (nndraft-possibly-change-group group)
286   (let ((gnus-verbose-backends nil))
287     (nnoo-parent-function 'nndraft 'nnmh-request-accept-article
288                           (list group server last noinsert))))
289
290 (deffoo nndraft-request-replace-article (article group buffer)
291   (nndraft-possibly-change-group group)
292   (let ((nnmail-file-coding-system
293          (if (member group '("drafts" "delayed"))
294              message-draft-coding-system
295            mm-text-coding-system)))
296     (nnoo-parent-function 'nndraft 'nnmh-request-replace-article
297                           (list article group buffer))))
298
299 (deffoo nndraft-request-create-group (group &optional server args)
300   (nndraft-possibly-change-group group)
301   (if (file-exists-p nndraft-current-directory)
302       (if (file-directory-p nndraft-current-directory)
303           t
304         nil)
305     (condition-case ()
306         (progn
307           (gnus-make-directory nndraft-current-directory)
308           t)
309       (file-error nil))))
310
311 \f
312 ;;; Low-Level Interface
313
314 (defun nndraft-possibly-change-group (group)
315   (when (and group
316              (not (equal group nndraft-current-group)))
317     (nndraft-open-server "")
318     (setq nndraft-current-group group)
319     (setq nndraft-current-directory
320           (nnheader-concat nndraft-directory group))))
321
322 (defun nndraft-article-filename (article &rest args)
323   (apply 'concat
324          (file-name-as-directory nndraft-current-directory)
325          (int-to-string article)
326          args))
327
328 (defun nndraft-auto-save-file-name (file)
329   (save-excursion
330     (prog1
331         (progn
332           (set-buffer (get-buffer-create " *draft tmp*"))
333           (setq buffer-file-name file)
334           (make-auto-save-file-name))
335       (kill-buffer (current-buffer)))))
336
337 (defun nndraft-articles ()
338   "Return the list of messages in the group."
339   (gnus-make-directory nndraft-current-directory)
340   (sort
341    (mapcar 'string-to-number
342            (directory-files nndraft-current-directory nil "\\`[0-9]+\\'" t))
343    '<))
344
345 (nnoo-import nndraft
346   (nnmh
347    nnmh-retrieve-headers
348    nnmh-request-group
349    nnmh-close-group
350    nnmh-request-list))
351
352 (provide 'nndraft)
353
354 ;;; nndraft.el ends here