1 ;;; nnmaildir.el --- maildir backend for Gnus
3 ;; This file is in the public domain.
5 ;; Author: Paul Jarc <prj@po.cwru.edu>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software: you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation, either version 3 of the License, or
12 ;; (at your option) any later version.
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24 ;; Maildir format is documented at <URL:http://cr.yp.to/proto/maildir.html>
25 ;; and in the maildir(5) man page from qmail (available at
26 ;; <URL:http://www.qmail.org/man/man5/maildir.html>). nnmaildir also stores
27 ;; extra information in the .nnmaildir/ directory within a maildir.
29 ;; Some goals of nnmaildir:
30 ;; * Everything Just Works, and correctly. E.g., NOV data is automatically
31 ;; regenerated when stale; no need for manually running
32 ;; *-generate-nov-databases.
33 ;; * Perfect reliability: [C-g] will never corrupt its data in memory, and
34 ;; SIGKILL will never corrupt its data in the filesystem.
35 ;; * Allow concurrent operation as much as possible. If files change out
36 ;; from under us, adapt to the changes or degrade gracefully.
37 ;; * We use the filesystem as a database, so that, e.g., it's easy to
38 ;; manipulate marks from outside Gnus.
39 ;; * All information about a group is stored in the maildir, for easy backup,
40 ;; copying, restoring, etc.
43 ;; * When moving an article for expiry, copy all the marks except 'expire
44 ;; from the original article.
45 ;; * Add a hook for when moving messages from new/ to cur/, to support
46 ;; nnmail's duplicate detection.
47 ;; * Improve generated Xrefs, so crossposts are detectable.
48 ;; * Improve code readability.
52 ;; eval this before editing
54 (put 'nnmaildir--with-nntp-buffer 'lisp-indent-function 0)
55 (put 'nnmaildir--with-work-buffer 'lisp-indent-function 0)
56 (put 'nnmaildir--with-nov-buffer 'lisp-indent-function 0)
57 (put 'nnmaildir--with-move-buffer 'lisp-indent-function 0)
58 (put 'nnmaildir--condcase 'lisp-indent-function 2)
62 ;; For Emacs <22.2 and XEmacs.
64 (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
78 (defconst nnmaildir-version "Gnus")
80 (defvar nnmaildir-article-file-name nil
81 "*The filename of the most recently requested article. This variable is set
82 by nnmaildir-request-article.")
84 ;; The filename of the article being moved/copied:
85 (defvar nnmaildir--file nil)
87 ;; Variables to generate filenames of messages being delivered:
88 (defvar nnmaildir--delivery-time "")
89 (defconst nnmaildir--delivery-pid (concat "P" (number-to-string (emacs-pid))))
90 (defvar nnmaildir--delivery-count nil)
92 ;; An obarry containing symbols whose names are server names and whose values
94 (defvar nnmaildir--servers (make-vector 3 0))
95 ;; The current server:
96 (defvar nnmaildir--cur-server nil)
98 ;; A copy of nnmail-extra-headers
99 (defvar nnmaildir--extra nil)
101 ;; A NOV structure looks like this (must be prin1-able, so no defstruct):
102 ["subject\tfrom\tdate"
103 "references\tchars\lines"
104 "To: you\tIn-Reply-To: <your.mess@ge>"
105 (12345 67890) ;; modtime of the corresponding article file
106 (to in-reply-to)] ;; contemporary value of nnmail-extra-headers
107 (defconst nnmaildir--novlen 5)
108 (defmacro nnmaildir--nov-new (beg mid end mtime extra)
109 `(vector ,beg ,mid ,end ,mtime ,extra))
110 (defmacro nnmaildir--nov-get-beg (nov) `(aref ,nov 0))
111 (defmacro nnmaildir--nov-get-mid (nov) `(aref ,nov 1))
112 (defmacro nnmaildir--nov-get-end (nov) `(aref ,nov 2))
113 (defmacro nnmaildir--nov-get-mtime (nov) `(aref ,nov 3))
114 (defmacro nnmaildir--nov-get-extra (nov) `(aref ,nov 4))
115 (defmacro nnmaildir--nov-set-beg (nov value) `(aset ,nov 0 ,value))
116 (defmacro nnmaildir--nov-set-mid (nov value) `(aset ,nov 1 ,value))
117 (defmacro nnmaildir--nov-set-end (nov value) `(aset ,nov 2 ,value))
118 (defmacro nnmaildir--nov-set-mtime (nov value) `(aset ,nov 3 ,value))
119 (defmacro nnmaildir--nov-set-extra (nov value) `(aset ,nov 4 ,value))
121 (defstruct nnmaildir--art
122 (prefix nil :type string) ;; "time.pid.host"
123 (suffix nil :type string) ;; ":2,flags"
124 (num nil :type natnum) ;; article number
125 (msgid nil :type string) ;; "<mess.age@id>"
126 (nov nil :type vector)) ;; cached nov structure, or nil
128 (defstruct nnmaildir--grp
129 (name nil :type string) ;; "group.name"
130 (new nil :type list) ;; new/ modtime
131 (cur nil :type list) ;; cur/ modtime
132 (min 1 :type natnum) ;; minimum article number
133 (count 0 :type natnum) ;; count of articles
134 (nlist nil :type list) ;; list of articles, ordered descending by number
135 (flist nil :type vector) ;; obarray mapping filename prefix->article
136 (mlist nil :type vector) ;; obarray mapping message-id->article
137 (cache nil :type vector) ;; nov cache
138 (index nil :type natnum) ;; index of next cache entry to replace
139 (mmth nil :type vector)) ;; obarray mapping mark name->dir modtime
140 ; ("Mark Mod Time Hash")
142 (defstruct nnmaildir--srv
143 (address nil :type string) ;; server address string
144 (method nil :type list) ;; (nnmaildir "address" ...)
145 (prefix nil :type string) ;; "nnmaildir+address:"
146 (dir nil :type string) ;; "/expanded/path/to/server/dir/"
147 (ls nil :type function) ;; directory-files function
148 (groups nil :type vector) ;; obarray mapping group name->group
149 (curgrp nil :type nnmaildir--grp) ;; current group, or nil
150 (error nil :type string) ;; last error message, or nil
151 (mtime nil :type list) ;; modtime of dir
152 (gnm nil) ;; flag: split from mail-sources?
153 (target-prefix nil :type string)) ;; symlink target prefix
155 (defun nnmaildir--expired-article (group article)
156 (setf (nnmaildir--art-nov article) nil)
157 (let ((flist (nnmaildir--grp-flist group))
158 (mlist (nnmaildir--grp-mlist group))
159 (min (nnmaildir--grp-min group))
160 (count (1- (nnmaildir--grp-count group)))
161 (prefix (nnmaildir--art-prefix article))
162 (msgid (nnmaildir--art-msgid article))
164 (nlist-pre '(nil . nil))
166 (unless (zerop count)
167 (setq nlist-post (nnmaildir--grp-nlist group)
168 num (nnmaildir--art-num article))
169 (if (eq num (caar nlist-post))
170 (setq new-nlist (cdr nlist-post))
171 (setq new-nlist nlist-post
173 nlist-post (cdr nlist-post))
174 (while (/= num (caar nlist-post))
175 (setq nlist-pre nlist-post
176 nlist-post (cdr nlist-post)))
177 (setq nlist-post (cdr nlist-post))
179 (setq min (caar nlist-pre)))))
180 (let ((inhibit-quit t))
181 (setf (nnmaildir--grp-min group) min)
182 (setf (nnmaildir--grp-count group) count)
183 (setf (nnmaildir--grp-nlist group) new-nlist)
184 (setcdr nlist-pre nlist-post)
185 (unintern prefix flist)
186 (unintern msgid mlist))))
188 (defun nnmaildir--nlist-art (group num)
189 (let ((entry (assq num (nnmaildir--grp-nlist group))))
192 (defmacro nnmaildir--flist-art (list file)
193 `(symbol-value (intern-soft ,file ,list)))
194 (defmacro nnmaildir--mlist-art (list msgid)
195 `(symbol-value (intern-soft ,msgid ,list)))
197 (defun nnmaildir--pgname (server gname)
198 (let ((prefix (nnmaildir--srv-prefix server)))
199 (if prefix (concat prefix gname)
200 (setq gname (gnus-group-prefixed-name gname
201 (nnmaildir--srv-method server)))
202 (setf (nnmaildir--srv-prefix server) (gnus-group-real-prefix gname))
205 (defun nnmaildir--param (pgname param)
206 (setq param (gnus-group-find-parameter pgname param 'allow-list))
207 (if (vectorp param) (setq param (aref param 0)))
210 (defmacro nnmaildir--with-nntp-buffer (&rest body)
211 `(with-current-buffer nntp-server-buffer
213 (defmacro nnmaildir--with-work-buffer (&rest body)
214 `(with-current-buffer (get-buffer-create " *nnmaildir work*")
216 (defmacro nnmaildir--with-nov-buffer (&rest body)
217 `(with-current-buffer (get-buffer-create " *nnmaildir nov*")
219 (defmacro nnmaildir--with-move-buffer (&rest body)
220 `(with-current-buffer (get-buffer-create " *nnmaildir move*")
223 (defmacro nnmaildir--subdir (dir subdir)
224 `(file-name-as-directory (concat ,dir ,subdir)))
225 (defmacro nnmaildir--srvgrp-dir (srv-dir gname)
226 `(nnmaildir--subdir ,srv-dir ,gname))
227 (defmacro nnmaildir--tmp (dir) `(nnmaildir--subdir ,dir "tmp"))
228 (defmacro nnmaildir--new (dir) `(nnmaildir--subdir ,dir "new"))
229 (defmacro nnmaildir--cur (dir) `(nnmaildir--subdir ,dir "cur"))
230 (defmacro nnmaildir--nndir (dir) `(nnmaildir--subdir ,dir ".nnmaildir"))
231 (defmacro nnmaildir--nov-dir (dir) `(nnmaildir--subdir ,dir "nov"))
232 (defmacro nnmaildir--marks-dir (dir) `(nnmaildir--subdir ,dir "marks"))
233 (defmacro nnmaildir--num-dir (dir) `(nnmaildir--subdir ,dir "num"))
235 (defmacro nnmaildir--unlink (file-arg)
236 `(let ((file ,file-arg))
237 (if (file-attributes file) (delete-file file))))
238 (defun nnmaildir--mkdir (dir)
239 (or (file-exists-p (file-name-as-directory dir))
240 (make-directory-internal (directory-file-name dir))))
241 (defun nnmaildir--mkfile (file)
242 (write-region "" nil file nil 'no-message))
243 (defun nnmaildir--delete-dir-files (dir ls)
244 (when (file-attributes dir)
245 (mapc 'delete-file (funcall ls dir 'full "\\`[^.]" 'nosort))
246 (delete-directory dir)))
248 (defun nnmaildir--group-maxnum (server group)
250 (if (zerop (nnmaildir--grp-count group)) (throw 'return 0))
251 (let ((dir (nnmaildir--srvgrp-dir (nnmaildir--srv-dir server)
252 (nnmaildir--grp-name group)))
254 attr ino-opened nlink number-linked)
255 (setq dir (nnmaildir--nndir dir)
256 dir (nnmaildir--num-dir dir))
258 (setq attr (file-attributes
259 (concat dir (number-to-string number-opened))))
260 (or attr (throw 'return (1- number-opened)))
261 (setq ino-opened (nth 10 attr)