;;; userlock.el --- handle file access contention between multiple users
-;; Copyright (C) 1985, 1986, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+;; Copyright (C) 1985-1986, 2001-2014 Free Software Foundation, Inc.
-;; Maintainer: FSF
+;; Author: Richard King
+;; (according to authors.el)
+;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal
+;; Package: emacs
;; This file is part of GNU Emacs.
;;; Code:
-(put 'file-locked 'error-conditions '(file-locked file-error error))
-(put 'file-locked 'error-message "File is locked")
+(define-error 'file-locked "File is locked" 'file-error)
;;;###autoload
(defun ask-user-about-lock (file opponent)
(with-current-buffer standard-output
(help-mode))))
-(put
- 'file-supersession 'error-conditions '(file-supersession file-error error))
+(define-error 'file-supersession nil 'file-error)
;;;###autoload
(defun ask-user-about-supersession-threat (fn)
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 ()