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comparison lisp/gnus/gnus-dup.el @ 98:0d2f883870bc r20-1b1

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Import from CVS: tag r20-1b1
author cvs
date Mon, 13 Aug 2007 09:13:56 +0200
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97:498bf5da1c90 98:0d2f883870bc
1 ;;; gnus-dup.el --- suppression of duplicate articles in Gnus
2 ;; Copyright (C) 1996,97 Free Software Foundation, Inc.
3
4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
5 ;; Keywords: news
6
7 ;; This file is part of GNU Emacs.
8
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 2, or (at your option)
12 ;; any later version.
13
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.
18
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 ;; Boston, MA 02111-1307, USA.
23
24 ;;; Commentary:
25
26 ;; This package tries to mark articles as read the second time the
27 ;; user reads a copy. This is useful if the server doesn't support
28 ;; Xref properly, or if the user reads the same group from several
29 ;; servers.
30
31 ;;; Code:
32
33 (require 'gnus)
34 (require 'gnus-art)
35
36 (defgroup gnus-duplicate nil
37 "Suppression of duplicate articles."
38 :group 'gnus)
39
40 (defcustom gnus-save-duplicate-list nil
41 "*If non-nil, save the duplicate list when shutting down Gnus.
42 If nil, duplicate suppression will only work on duplicates
43 seen in the same session."
44 :group 'gnus-duplicate
45 :type 'boolean)
46
47 (defcustom gnus-duplicate-list-length 10000
48 "*The number of Message-IDs to keep in the duplicate suppression list."
49 :group 'gnus-duplicate
50 :type 'integer)
51
52 (defcustom gnus-duplicate-file (nnheader-concat gnus-directory "suppression")
53 "*The name of the file to store the duplicate suppression list."
54 :group 'gnus-duplicate
55 :type 'file)
56
57 ;;; Internal variables
58
59 (defvar gnus-dup-list nil)
60 (defvar gnus-dup-hashtb nil)
61
62 (defvar gnus-dup-list-dirty nil)
63
64 ;;;
65 ;;; Starting and stopping
66 ;;;
67
68 (gnus-add-shutdown 'gnus-dup-close 'gnus)
69
70 (defun gnus-dup-close ()
71 "Possibly save the duplicate suppression list and shut down the subsystem."
72 (gnus-dup-save)
73 (setq gnus-dup-list nil
74 gnus-dup-hashtb nil
75 gnus-dup-list-dirty nil))
76
77 (defun gnus-dup-open ()
78 "Possibly read the duplicate suppression list and start the subsystem."
79 (if gnus-save-duplicate-list
80 (gnus-dup-read)
81 (setq gnus-dup-list nil))
82 (setq gnus-dup-hashtb (gnus-make-hashtable gnus-duplicate-list-length))
83 ;; Enter all Message-IDs into the hash table.
84 (let ((list gnus-dup-list)
85 (obarray gnus-dup-hashtb))
86 (while list
87 (intern (pop list)))))
88
89 (defun gnus-dup-read ()
90 "Read the duplicate suppression list."
91 (setq gnus-dup-list nil)
92 (when (file-exists-p gnus-duplicate-file)
93 (load gnus-duplicate-file t t t)))
94
95 (defun gnus-dup-save ()
96 "Save the duplicate suppression list."
97 (when (and gnus-save-duplicate-list
98 gnus-dup-list-dirty)
99 (nnheader-temp-write gnus-duplicate-file
100 (gnus-prin1 `(setq gnus-dup-list ',gnus-dup-list))))
101 (setq gnus-dup-list-dirty nil))
102
103 ;;;
104 ;;; Interface functions
105 ;;;
106
107 (defun gnus-dup-enter-articles ()
108 "Enter articles from the current group for future duplicate suppression."
109 (unless gnus-dup-list
110 (gnus-dup-open))
111 (setq gnus-dup-list-dirty t) ; mark list for saving
112 (let ((data gnus-newsgroup-data)
113 datum msgid)
114 ;; Enter the Message-IDs of all read articles into the list
115 ;; and hash table.
116 (while (setq datum (pop data))
117 (when (and (not (gnus-data-pseudo-p datum))
118 (> (gnus-data-number datum) 0)
119 (gnus-data-read-p datum)
120 (not (= (gnus-data-mark datum) gnus-canceled-mark))
121 (setq msgid (mail-header-id (gnus-data-header datum)))
122 (not (nnheader-fake-message-id-p msgid))
123 (not (intern-soft msgid gnus-dup-hashtb)))
124 (push msgid gnus-dup-list)
125 (intern msgid gnus-dup-hashtb))))
126 ;; Chop off excess Message-IDs from the list.
127 (let ((end (nthcdr gnus-duplicate-list-length gnus-dup-list)))
128 (when end
129 (setcdr end nil))))
130
131 (defun gnus-dup-suppress-articles ()
132 "Mark duplicate articles as read."
133 (unless gnus-dup-list
134 (gnus-dup-open))
135 (gnus-message 6 "Suppressing duplicates...")
136 (let ((headers gnus-newsgroup-headers)
137 number header)
138 (while (setq header (pop headers))
139 (when (and (intern-soft (mail-header-id header) gnus-dup-hashtb)
140 (gnus-summary-article-unread-p (mail-header-number header)))
141 (setq gnus-newsgroup-unreads
142 (delq (setq number (mail-header-number header))
143 gnus-newsgroup-unreads))
144 (push (cons number gnus-duplicate-mark)
145 gnus-newsgroup-reads))))
146 (gnus-message 6 "Suppressing duplicates...done"))
147
148 (defun gnus-dup-unsuppress-article (article)
149 "Stop suppression of ARTICLE."
150 (let ((id (mail-header-id (gnus-data-header (gnus-data-find article)))))
151 (when id
152 (setq gnus-dup-list-dirty t)
153 (setq gnus-dup-list (delete id gnus-dup-list))
154 (unintern id gnus-dup-hashtb))))
155
156 (provide 'gnus-dup)
157
158 ;;; gnus-dup.el ends here