;; Author: FSF (see vc.el for full credits)
;; Maintainer: Andre Spiegel <spiegel@gnu.org>
-;; $Id: vc-hooks.el,v 1.134.4.2 2001/12/14 08:19:06 spiegel Exp $
+;; $Id: vc-hooks.el,v 1.134.4.3 2002/07/20 17:24:56 spiegel Exp $
;; This file is part of GNU Emacs.
and does not employ any heuristic at all."
(vc-call-backend backend 'state file))
+(defun vc-workfile-unchanged-p (file)
+ "Return non-nil if FILE has not changed since the last checkout."
+ (let ((checkout-time (vc-file-getprop file 'vc-checkout-time))
+ (lastmod (nth 5 (file-attributes file))))
+ (if checkout-time
+ (equal checkout-time lastmod)
+ (let ((unchanged (vc-call workfile-unchanged-p file)))
+ (vc-file-setprop file 'vc-checkout-time (if unchanged lastmod 0))
+ unchanged))))
+
+(defun vc-default-workfile-unchanged-p (backend file)
+ "Check if FILE is unchanged by diffing against the master version.
+Return non-nil if FILE is unchanged."
+ (zerop (vc-call diff file (vc-workfile-version file))))
+
(defun vc-workfile-version (file)
"Return the version level of the current workfile FILE.
If FILE is not registered, this function always returns nil."