X-Git-Url: http://cgit.sxemacs.org/?a=blobdiff_plain;f=lisp%2Fgnus-undo.el;h=90cf174fda6f395e200501b3bfef91062aa7002a;hb=9954729d205c97242f0787c79dc23e7b051a6201;hp=5321f3a15c81431540455000035968f9b2be058b;hpb=a629ef97108075cbae0b8b69b2dd1a4723a520c8;p=gnus

diff --git a/lisp/gnus-undo.el b/lisp/gnus-undo.el
index 5321f3a15..90cf174fd 100644
--- a/lisp/gnus-undo.el
+++ b/lisp/gnus-undo.el
@@ -1,7 +1,7 @@
 ;;; gnus-undo.el --- minor mode for undoing in Gnus
 ;; Copyright (C) 1996,97,98 Free Software Foundation, Inc.
 
-;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: news
 
 ;; This file is part of GNU Emacs.
@@ -25,7 +25,7 @@
 
 ;; This package allows arbitrary undoing in Gnus buffers.  As all the
 ;; Gnus buffers aren't very text-oriented (what is in the buffers is
-;; just some random representation of the actual data), normal Emacs
+;; just some arbitrary representation of the actual data), normal Emacs
 ;; undoing doesn't work at all for Gnus.
 ;;
 ;; This package works by letting Gnus register functions for reversing
@@ -48,12 +48,26 @@
 
 (require 'gnus-util)
 (require 'gnus)
+(require 'custom)
 
-(defvar gnus-undo-mode nil
-  "Minor mode for undoing in Gnus buffers.")
+(defgroup gnus-undo nil
+  "Undoing in Gnus buffers."
+  :group 'gnus)
 
-(defvar gnus-undo-mode-hook nil
-  "Hook called in all `gnus-undo-mode' buffers.")
+(defcustom gnus-undo-limit 2000
+  "The number of undoable actions recorded."
+  :type 'integer
+  :group 'gnus-undo)
+
+(defcustom gnus-undo-mode nil
+  "Minor mode for undoing in Gnus buffers."
+  :type 'boolean
+  :group 'gnus-undo)
+
+(defcustom gnus-undo-mode-hook nil
+  "Hook called in all `gnus-undo-mode' buffers."
+  :type 'hook
+  :group 'gnus-undo)
 
 ;;; Internal variables.
 
@@ -148,6 +162,11 @@ FORMS may use backtick quote syntax."
      ;; Initialize list.
      (t
       (setq gnus-undo-actions (list (list function)))))
+    ;; Limit the length of the undo list.
+    (let ((next (nthcdr gnus-undo-limit gnus-undo-actions)))
+      (when next
+	(setcdr next nil)))
+    ;; We are not at a boundary...
     (setq gnus-undo-boundary-inhibit t)))
 
 (defun gnus-undo (n)