X-Git-Url: https://cgit.sxemacs.org/?a=blobdiff_plain;f=lisp%2Fgnus-undo.el;h=7dd333f1c938e3b8932eaa35576395b2710ab2ba;hb=4d4e7c8dca83d37ee46f7aabe17775d9337fd677;hp=39c0a50b90ee34fd83a11a8ea1c1c6e73823a209;hpb=cb7891a6614b1094a44036775fb6520b9992de79;p=gnus

diff --git a/lisp/gnus-undo.el b/lisp/gnus-undo.el
index 39c0a50b9..7dd333f1c 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 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
@@ -44,14 +46,30 @@
 
 ;;; Code:
 
+(eval-when-compile (require 'cl))
+
 (require 'gnus-util)
 (require 'gnus)
+(require 'custom)
+
+(defgroup gnus-undo nil
+  "Undoing in Gnus buffers."
+  :group 'gnus)
 
-(defvar gnus-undo-mode nil
-  "Minor mode for undoing in Gnus buffers.")
+(defcustom gnus-undo-limit 2000
+  "The number of undoable actions recorded."
+  :type 'integer
+  :group 'gnus-undo)
 
-(defvar gnus-undo-mode-hook nil
-  "Hook called in all `gnus-undo-mode' buffers.")
+(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.
 
@@ -68,13 +86,18 @@
   (setq gnus-undo-mode-map (make-sparse-keymap))
 
   (gnus-define-keys gnus-undo-mode-map
-   "\M-\C-_" 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.
   (when nil
-  (define-key-after (current-local-map) [menu-bar file gnus-undo]
-    (cons "Undo" 'gnus-undo-actions)
-    [menu-bar file whatever])))
+    (define-key-after (current-local-map) [menu-bar file gnus-undo]
+      (cons "Undo" 'gnus-undo-actions)
+      [menu-bar file whatever])))
 
 (defun gnus-undo-mode (&optional arg)
   "Minor mode for providing `undo' in Gnus buffers.
@@ -90,16 +113,10 @@
     ;; Set up the menu.
     (when (gnus-visual-p 'undo-menu 'menu)
       (gnus-undo-make-menu-bar))
-    ;; Don't display anything in the mode line -- too annoying.
-    ;;(unless (assq 'gnus-undo-mode minor-mode-alist)
-    ;;  (push '(gnus-undo-mode " Undo") minor-mode-alist))
-    (unless (assq 'gnus-undo-mode minor-mode-map-alist)
-      (push (cons 'gnus-undo-mode gnus-undo-mode-map)
-	    minor-mode-map-alist))
+    (gnus-add-minor-mode 'gnus-undo-mode "" gnus-undo-mode-map)
     (make-local-hook 'post-command-hook)
-    (gnus-add-hook 'post-command-hook 'gnus-undo-boundary nil t)
-    (add-hook 'gnus-summary-exit-hook 'gnus-undo-boundary)
-    (run-hooks 'gnus-undo-mode-hook)))
+    (add-hook 'post-command-hook 'gnus-undo-boundary nil t)
+    (gnus-run-hooks 'gnus-undo-mode-hook)))
 
 ;;; Interface functions.
 
@@ -117,6 +134,11 @@
       (setq gnus-undo-boundary-inhibit nil)
     (setq gnus-undo-boundary t)))
 
+(defun gnus-undo-force-boundary ()
+  "Set Gnus undo boundary."
+  (setq gnus-undo-boundary-inhibit nil
+	gnus-undo-boundary t))
+
 (defun gnus-undo-register (form)
   "Register FORMS as something to be performed to undo a change.
 FORMS may use backtick quote syntax."
@@ -142,6 +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)