X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fgnus-undo.el;h=7dd333f1c938e3b8932eaa35576395b2710ab2ba;hb=3085bc3c0b00d3ab06d26d1d997a6660aedf0b5e;hp=5321f3a15c81431540455000035968f9b2be058b;hpb=7523ac5e3a0e4196d6043822dcb826c060fc1b58;p=elisp%2Fgnus.git-

diff --git a/lisp/gnus-undo.el b/lisp/gnus-undo.el
index 5321f3a..7dd333f 100644
--- a/lisp/gnus-undo.el
+++ b/lisp/gnus-undo.el
@@ -1,7 +1,9 @@
 ;;; 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>
+;; Copyright (C) 1996, 1997, 1998, 1999, 2000
+;;	Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: news
 
 ;; This file is part of GNU Emacs.
@@ -25,7 +27,7 @@
 
 ;; 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 +50,26 @@
 
 (require 'gnus-util)
 (require 'gnus)
+(require 'custom)
+
+(defgroup gnus-undo nil
+  "Undoing in Gnus buffers."
+  :group 'gnus)
+
+(defcustom gnus-undo-limit 2000
+  "The number of undoable actions recorded."
+  :type 'integer
+  :group 'gnus-undo)
 
-(defvar gnus-undo-mode nil
-  "Minor mode for undoing in Gnus buffers.")
+(defcustom gnus-undo-mode nil
+  "Minor mode for undoing in Gnus buffers."
+  :type 'boolean
+  :group 'gnus-undo)
 
-(defvar gnus-undo-mode-hook nil
-  "Hook called in all `gnus-undo-mode' buffers.")
+(defcustom gnus-undo-mode-hook nil
+  "Hook called in all `gnus-undo-mode' buffers."
+  :type 'hook
+  :group 'gnus-undo)
 
 ;;; Internal variables.
 
@@ -70,11 +86,11 @@
   (setq gnus-undo-mode-map (make-sparse-keymap))
 
   (gnus-define-keys gnus-undo-mode-map
-   "\M-\C-_"     gnus-undo
-   "\C-_"        gnus-undo
-   "\C-xu"       gnus-undo
-   ;; many people are used to type `C-/' on X terminals and get `C-_'.
-   [(control /)] gnus-undo))
+    "\M-\C-_"     gnus-undo
+    "\C-_"        gnus-undo
+    "\C-xu"       gnus-undo
+    ;; many people are used to type `C-/' on X terminals and get `C-_'.
+    [(control /)] gnus-undo))
 
 (defun gnus-undo-make-menu-bar ()
   ;; This is disabled for the time being.
@@ -148,6 +164,11 @@ 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)