[Emacs-diffs] Changes to emacs/lisp/gnus/gnus-dup.el [gnus-5_10-branch]

[Andreas Schwab]

Index: emacs/lisp/gnus/gnus-dup.el
diff -c /dev/null emacs/lisp/gnus/gnus-dup.el:1.5.2.1
*** /dev/null   Thu Jul 22 16:46:16 2004
--- emacs/lisp/gnus/gnus-dup.el Thu Jul 22 16:45:47 2004
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*** 0 ****
--- 1,166 ----
+ ;;; gnus-dup.el --- suppression of duplicate articles in Gnus
+ ;; Copyright (C) 1996, 1997, 1998, 1999, 2000
+ ;;        Free Software Foundation, Inc.
+ 
+ ;; Author: Lars Magne Ingebrigtsen <address@hidden>
+ ;; Keywords: news
+ 
+ ;; This file is part of GNU Emacs.
+ 
+ ;; GNU Emacs is free software; you can redistribute it and/or modify
+ ;; it under the terms of the GNU General Public License as published by
+ ;; the Free Software Foundation; either version 2, or (at your option)
+ ;; any later version.
+ 
+ ;; GNU Emacs is distributed in the hope that it will be useful,
+ ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+ ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.        See the
+ ;; GNU General Public License for more details.
+ 
+ ;; You should have received a copy of the GNU General Public License
+ ;; along with GNU Emacs; see the file COPYING.  If not, write to the
+ ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+ 
+ ;;; Commentary:
+ 
+ ;; This package tries to mark articles as read the second time the
+ ;; user reads a copy.  This is useful if the server doesn't support
+ ;; Xref properly, or if the user reads the same group from several
+ ;; servers.
+ 
+ ;;; Code:
+ 
+ (eval-when-compile (require 'cl))
+ 
+ (require 'gnus)
+ (require 'gnus-art)
+ 
+ (defgroup gnus-duplicate nil
+   "Suppression of duplicate articles."
+   :group 'gnus)
+ 
+ (defcustom gnus-save-duplicate-list nil
+   "*If non-nil, save the duplicate list when shutting down Gnus.
+ If nil, duplicate suppression will only work on duplicates
+ seen in the same session."
+   :group 'gnus-duplicate
+   :type 'boolean)
+ 
+ (defcustom gnus-duplicate-list-length 10000
+   "*The number of Message-IDs to keep in the duplicate suppression list."
+   :group 'gnus-duplicate
+   :type 'integer)
+ 
+ (defcustom gnus-duplicate-file (nnheader-concat gnus-directory "suppression")
+   "*The name of the file to store the duplicate suppression list."
+   :group 'gnus-duplicate
+   :type 'file)
+ 
+ ;;; Internal variables
+ 
+ (defvar gnus-dup-list nil)
+ (defvar gnus-dup-hashtb nil)
+ 
+ (defvar gnus-dup-list-dirty nil)
+ 
+ ;;;
+ ;;; Starting and stopping
+ ;;;
+ 
+ (gnus-add-shutdown 'gnus-dup-close 'gnus)
+ 
+ (defun gnus-dup-close ()
+   "Possibly save the duplicate suppression list and shut down the subsystem."
+   (gnus-dup-save)
+   (setq gnus-dup-list nil
+       gnus-dup-hashtb nil
+       gnus-dup-list-dirty nil))
+ 
+ (defun gnus-dup-open ()
+   "Possibly read the duplicate suppression list and start the subsystem."
+   (if gnus-save-duplicate-list
+       (gnus-dup-read)
+     (setq gnus-dup-list nil))
+   (setq gnus-dup-hashtb (gnus-make-hashtable gnus-duplicate-list-length))
+   ;; Enter all Message-IDs into the hash table.
+   (let ((list gnus-dup-list)
+       (obarray gnus-dup-hashtb))
+     (while list
+       (intern (pop list)))))
+ 
+ (defun gnus-dup-read ()
+   "Read the duplicate suppression list."
+   (setq gnus-dup-list nil)
+   (when (file-exists-p gnus-duplicate-file)
+     (load gnus-duplicate-file t t t)))
+ 
+ (defun gnus-dup-save ()
+   "Save the duplicate suppression list."
+   (when (and gnus-save-duplicate-list
+            gnus-dup-list-dirty)
+     (with-temp-file gnus-duplicate-file
+       (gnus-prin1 `(setq gnus-dup-list ',gnus-dup-list))))
+   (setq gnus-dup-list-dirty nil))
+ 
+ ;;;
+ ;;; Interface functions
+ ;;;
+ 
+ (defun gnus-dup-enter-articles ()
+   "Enter articles from the current group for future duplicate suppression."
+   (unless gnus-dup-list
+     (gnus-dup-open))
+   (setq gnus-dup-list-dirty t)                ; mark list for saving
+   (let ((data gnus-newsgroup-data)
+       datum msgid)
+     ;; Enter the Message-IDs of all read articles into the list
+     ;; and hash table.
+     (while (setq datum (pop data))
+       (when (and (not (gnus-data-pseudo-p datum))
+                (> (gnus-data-number datum) 0)
+                (not (memq (gnus-data-number datum) gnus-newsgroup-unreads))
+                (not (= (gnus-data-mark datum) gnus-canceled-mark))
+                (setq msgid (mail-header-id (gnus-data-header datum)))
+                (not (nnheader-fake-message-id-p msgid))
+                (not (intern-soft msgid gnus-dup-hashtb)))
+       (push msgid gnus-dup-list)
+       (intern msgid gnus-dup-hashtb))))
+   ;; Chop off excess Message-IDs from the list.
+   (let ((end (nthcdr gnus-duplicate-list-length gnus-dup-list)))
+     (when end
+       (setcdr end nil))))
+ 
+ (defun gnus-dup-suppress-articles ()
+   "Mark duplicate articles as read."
+   (unless gnus-dup-list
+     (gnus-dup-open))
+   (gnus-message 6 "Suppressing duplicates...")
+   (let ((headers gnus-newsgroup-headers)
+       (auto (and gnus-newsgroup-auto-expire
+                  (memq gnus-duplicate-mark gnus-auto-expirable-marks)))
+       number header)
+     (while (setq header (pop headers))
+       (when (and (intern-soft (mail-header-id header) gnus-dup-hashtb)
+                (gnus-summary-article-unread-p (mail-header-number header)))
+       (setq gnus-newsgroup-unreads
+             (delq (setq number (mail-header-number header))
+                   gnus-newsgroup-unreads))
+       (if (not auto)
+           (push (cons number gnus-duplicate-mark) gnus-newsgroup-reads)
+         (push number gnus-newsgroup-expirable)
+         (push (cons number gnus-expirable-mark) gnus-newsgroup-reads)))))
+   (gnus-message 6 "Suppressing duplicates...done"))
+ 
+ (defun gnus-dup-unsuppress-article (article)
+   "Stop suppression of ARTICLE."
+   (let ((id (mail-header-id (gnus-data-header (gnus-data-find article)))))
+     (when id
+       (setq gnus-dup-list-dirty t)
+       (setq gnus-dup-list (delete id gnus-dup-list))
+       (unintern id gnus-dup-hashtb))))
+ 
+ (provide 'gnus-dup)
+ 
+ ;;; arch-tag: 903e94db-7b00-4d19-83ee-cf34a81fa5fb
+ ;;; gnus-dup.el ends here