Merge from emacs-24; up to 2012-12-21T07:35:02Z!ueno@gnu.org

[gnu-emacs] / lisp / userlock.el

diff --git a/lisp/userlock.el b/lisp/userlock.el
index 8e4a6753a31ad20d7ae3287b9045eb63def06a68..4ad96eb41ce368b0d5997079e5497e21af0ee08f 100644 (file)
--- a/lisp/userlock.el
+++ b/lisp/userlock.el
@@ -1,17 +1,17 @@
 ;;; userlock.el --- handle file access contention between multiple users
 
-;; Copyright (C) 1985, 1986, 2001, 2002, 2003, 2004,
-;;   2005, 2006, 2007 Free Software Foundation, Inc.
+;; Copyright (C) 1985-1986, 2001-2013 Free Software Foundation, Inc.
 
 ;; Maintainer: FSF
 ;; Keywords: internal
+;; Package: emacs
 
 ;; This file is part of GNU Emacs.
 
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
@@ -19,9 +19,7 @@
 ;; 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
@@ -93,8 +91,7 @@ You can <s>teal the file; the other user becomes the
   intruder if (s)he ever unmodifies the file and then changes it again.
 You can <p>roceed; you edit at your own (and the other user's) risk.
 You can <q>uit; don't modify this file.")
-    (save-excursion
-      (set-buffer standard-output)
+    (with-current-buffer standard-output
       (help-mode))))
 
 (put
@@ -111,37 +108,27 @@ You can rewrite this to use any criterion you like to choose which one to do.
 The buffer in question is current when this function is called."
   (discard-input)
   (save-window-excursion
-    (let (answer)
+    (let ((prompt
+          (format "%s changed on disk; \
+really edit the buffer? (y, n, r or C-h) "
+                  (file-name-nondirectory fn)))
+         (choices '(?y ?n ?r ?? ?\C-h))
+         answer)
       (while (null answer)
-       (message "%s changed on disk; really edit the buffer? (y, n, r or C-h) "
-                (file-name-nondirectory fn))
-       (let ((tem (downcase (let ((cursor-in-echo-area t))
-                              (read-char-exclusive)))))
-         (setq answer
-               (if (= tem help-char)
-                   'help
-                 (cdr (assoc tem '((?n . yield)
-                                   (?\C-g . yield)
-                                   (?y . proceed)
-                                   (?r . revert)
-                                   (?? . help))))))
-         (cond ((null answer)
-                (beep)
-                (message "Please type y, n or r; or ? for help")
-                (sit-for 3))
-               ((eq answer 'help)
-                (ask-user-about-supersession-help)
-                (setq answer nil))
-               ((eq answer 'revert)
-                (revert-buffer nil (not (buffer-modified-p)))
-                                       ; ask confirmation if buffer modified
-                (signal 'file-supersession
-                        (list "File reverted" fn)))
-               ((eq answer 'yield)
-                (signal 'file-supersession
-                        (list "File changed on disk" fn))))))
+       (setq answer (read-char-choice prompt choices))
+       (cond ((memq answer '(?? ?\C-h))
+              (ask-user-about-supersession-help)
+              (setq answer nil))
+             ((eq answer ?r)
+              ;; Ask for confirmation if buffer modified
+              (revert-buffer nil (not (buffer-modified-p)))
+              (signal 'file-supersession
+                      (list "File reverted" fn)))
+             ((eq answer ?n)
+              (signal 'file-supersession
+                      (list "File changed on disk" fn)))))
       (message
-        "File on disk now will become a backup file if you save these changes.")
+       "File on disk now will become a backup file if you save these changes.")
       (setq buffer-backed-up nil))))
 
 (defun ask-user-about-supersession-help ()
@@ -157,9 +144,7 @@ If you say `n', the change you started to make will be aborted.
 
 Usually, you should type `n' and then `M-x revert-buffer',
 to get the latest version of the file, then make the change again.")
-    (save-excursion
-      (set-buffer standard-output)
+    (with-current-buffer standard-output
       (help-mode))))
 
-;;; arch-tag: a61c5b60-e1c8-44fd-894a-c617f4dfc639
 ;;; userlock.el ends here