1;;; gnus-dup.el --- suppression of duplicate articles in Gnus 2 3;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 4;; 2005, 2006, 2007 Free Software Foundation, Inc. 5 6;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org> 7;; Keywords: news 8 9;; This file is part of GNU Emacs. 10 11;; GNU Emacs is free software; you can redistribute it and/or modify 12;; it under the terms of the GNU General Public License as published by 13;; the Free Software Foundation; either version 2, or (at your option) 14;; any later version. 15 16;; GNU Emacs is distributed in the hope that it will be useful, 17;; but WITHOUT ANY WARRANTY; without even the implied warranty of 18;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19;; GNU General Public License for more details. 20 21;; You should have received a copy of the GNU General Public License 22;; along with GNU Emacs; see the file COPYING. If not, write to the 23;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 24;; Boston, MA 02110-1301, USA. 25 26;;; Commentary: 27 28;; This package tries to mark articles as read the second time the 29;; user reads a copy. This is useful if the server doesn't support 30;; Xref properly, or if the user reads the same group from several 31;; servers. 32 33;;; Code: 34 35(eval-when-compile (require 'cl)) 36 37(require 'gnus) 38(require 'gnus-art) 39 40(defgroup gnus-duplicate nil 41 "Suppression of duplicate articles." 42 :group 'gnus) 43 44(defcustom gnus-save-duplicate-list nil 45 "*If non-nil, save the duplicate list when shutting down Gnus. 46If nil, duplicate suppression will only work on duplicates 47seen in the same session." 48 :group 'gnus-duplicate 49 :type 'boolean) 50 51(defcustom gnus-duplicate-list-length 10000 52 "*The number of Message-IDs to keep in the duplicate suppression list." 53 :group 'gnus-duplicate 54 :type 'integer) 55 56(defcustom gnus-duplicate-file (nnheader-concat gnus-directory "suppression") 57 "*The name of the file to store the duplicate suppression list." 58 :group 'gnus-duplicate 59 :type 'file) 60 61;;; Internal variables 62 63(defvar gnus-dup-list nil) 64(defvar gnus-dup-hashtb nil) 65 66(defvar gnus-dup-list-dirty nil) 67 68;;; 69;;; Starting and stopping 70;;; 71 72(gnus-add-shutdown 'gnus-dup-close 'gnus) 73 74(defun gnus-dup-close () 75 "Possibly save the duplicate suppression list and shut down the subsystem." 76 (gnus-dup-save) 77 (setq gnus-dup-list nil 78 gnus-dup-hashtb nil 79 gnus-dup-list-dirty nil)) 80 81(defun gnus-dup-open () 82 "Possibly read the duplicate suppression list and start the subsystem." 83 (if gnus-save-duplicate-list 84 (gnus-dup-read) 85 (setq gnus-dup-list nil)) 86 (setq gnus-dup-hashtb (gnus-make-hashtable gnus-duplicate-list-length)) 87 ;; Enter all Message-IDs into the hash table. 88 (let ((list gnus-dup-list) 89 (obarray gnus-dup-hashtb)) 90 (while list 91 (intern (pop list))))) 92 93(defun gnus-dup-read () 94 "Read the duplicate suppression list." 95 (setq gnus-dup-list nil) 96 (when (file-exists-p gnus-duplicate-file) 97 (load gnus-duplicate-file t t t))) 98 99(defun gnus-dup-save () 100 "Save the duplicate suppression list." 101 (when (and gnus-save-duplicate-list 102 gnus-dup-list-dirty) 103 (with-temp-file gnus-duplicate-file 104 (gnus-prin1 `(setq gnus-dup-list ',gnus-dup-list)))) 105 (setq gnus-dup-list-dirty nil)) 106 107;;; 108;;; Interface functions 109;;; 110 111(defun gnus-dup-enter-articles () 112 "Enter articles from the current group for future duplicate suppression." 113 (unless gnus-dup-list 114 (gnus-dup-open)) 115 (setq gnus-dup-list-dirty t) ; mark list for saving 116 (let ((data gnus-newsgroup-data) 117 datum msgid) 118 ;; Enter the Message-IDs of all read articles into the list 119 ;; and hash table. 120 (while (setq datum (pop data)) 121 (when (and (not (gnus-data-pseudo-p datum)) 122 (> (gnus-data-number datum) 0) 123 (not (memq (gnus-data-number datum) gnus-newsgroup-unreads)) 124 (not (= (gnus-data-mark datum) gnus-canceled-mark)) 125 (setq msgid (mail-header-id (gnus-data-header datum))) 126 (not (nnheader-fake-message-id-p msgid)) 127 (not (intern-soft msgid gnus-dup-hashtb))) 128 (push msgid gnus-dup-list) 129 (intern msgid gnus-dup-hashtb)))) 130 ;; Chop off excess Message-IDs from the list. 131 (let ((end (nthcdr gnus-duplicate-list-length gnus-dup-list))) 132 (when end 133 (setcdr end nil)))) 134 135(defun gnus-dup-suppress-articles () 136 "Mark duplicate articles as read." 137 (unless gnus-dup-list 138 (gnus-dup-open)) 139 (gnus-message 6 "Suppressing duplicates...") 140 (let ((headers gnus-newsgroup-headers) 141 (auto (and gnus-newsgroup-auto-expire 142 (memq gnus-duplicate-mark gnus-auto-expirable-marks))) 143 number header) 144 (while (setq header (pop headers)) 145 (when (and (intern-soft (mail-header-id header) gnus-dup-hashtb) 146 (gnus-summary-article-unread-p (mail-header-number header))) 147 (setq gnus-newsgroup-unreads 148 (delq (setq number (mail-header-number header)) 149 gnus-newsgroup-unreads)) 150 (if (not auto) 151 (push (cons number gnus-duplicate-mark) gnus-newsgroup-reads) 152 (push number gnus-newsgroup-expirable) 153 (push (cons number gnus-expirable-mark) gnus-newsgroup-reads))))) 154 (gnus-message 6 "Suppressing duplicates...done")) 155 156(defun gnus-dup-unsuppress-article (article) 157 "Stop suppression of ARTICLE." 158 (let ((id (mail-header-id (gnus-data-header (gnus-data-find article))))) 159 (when id 160 (setq gnus-dup-list-dirty t) 161 (setq gnus-dup-list (delete id gnus-dup-list)) 162 (unintern id gnus-dup-hashtb)))) 163 164(provide 'gnus-dup) 165 166;;; arch-tag: 903e94db-7b00-4d19-83ee-cf34a81fa5fb 167;;; gnus-dup.el ends here 168