Add 2010 to copyright years.

[bpt/emacs.git] / lisp / diff.el

diff --git a/lisp/diff.el b/lisp/diff.el
index e806a61..0206c17 100644 (file)
--- a/lisp/diff.el
+++ b/lisp/diff.el
@@ -1,8 +1,10 @@
 ;;; diff.el --- run `diff' in compilation-mode
 
-;; Copyright (C) 1992, 1994, 1996, 2001, 2002, 2003, 2004,
-;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+;; Copyright (C) 1992, 1994, 1996, 2001, 2002, 2003, 2004, 2005, 2006,
+;;   2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
+;; Author: Frank Bresz
+;; (according to authors.el)
 ;; Maintainer: FSF
 ;; Keywords: unix, tools
 
@@ -34,14 +36,14 @@
   :group 'tools)
 
 ;;;###autoload
-(defcustom diff-switches "-c"
-  "*A string or list of strings specifying switches to be passed to diff."
+(defcustom diff-switches (purecopy "-c")
+  "A string or list of strings specifying switches to be passed to diff."
   :type '(choice string (repeat string))
   :group 'diff)
 
 ;;;###autoload
-(defcustom diff-command "diff"
-  "*The command to use to run diff."
+(defcustom diff-command (purecopy "diff")
+  "The command to use to run diff."
   :type 'string
   :group 'diff)
 
@@ -68,7 +70,9 @@ were found."
     (goto-char (point-max))
     (let ((inhibit-read-only t))
       (insert (format "\nDiff finished%s.  %s\n"
-                     (if (equal 0 code) " (no differences)" "")
+                     (cond ((equal 0 code) " (no differences)")
+                           ((equal 2 code) " (diff error)")
+                           (t ""))
                      (current-time-string))))))
 
 (defvar diff-old-file nil)
@@ -78,10 +82,14 @@ were found."
 ;;;###autoload
 (defun diff (old new &optional switches no-async)
   "Find and display the differences between OLD and NEW files.
-Interactively the current buffer's file name is the default for NEW
-and a backup file for NEW is the default for OLD.
+When called interactively, read OLD and NEW using the minibuffer;
+the default for NEW is the current buffer's file name, and the
+default for OLD is a backup file for NEW, if one exists.
 If NO-ASYNC is non-nil, call diff synchronously.
-With prefix arg, prompt for diff switches."
+
+When called interactively with a prefix argument, prompt
+interactively for diff switches.  Otherwise, the switches
+specified in `diff-switches' are passed to the diff command."
   (interactive
    (let (oldf newf)
      (setq newf (buffer-file-name)