(defgroup reftex): Update home page url-link.

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

diff --git a/lisp/diff.el b/lisp/diff.el
index bee7277..534a84d 100644 (file)
--- a/lisp/diff.el
+++ b/lisp/diff.el
@@ -1,6 +1,7 @@
 ;;; diff.el --- run `diff' in compilation-mode
 
-;; Copyright (C) 1992, 1994, 1996, 2001, 2004 Free Software Foundation, Inc.
+;; Copyright (C) 1992, 1994, 1996, 2001, 2002, 2003, 2004,
+;;   2005, 2006 Free Software Foundation, Inc.
 
 ;; Maintainer: FSF
 ;; Keywords: unix, tools
@@ -66,9 +67,10 @@ CODE is the exit code of the process.  It should be 0 iff no diffs were found."
   (if diff-new-temp-file (delete-file diff-new-temp-file))
   (save-excursion
     (goto-char (point-max))
-    (insert (format "\nDiff finished%s.  %s\n"
-                   (if (equal 0 code) " (no differences)" "")
-                   (current-time-string)))))
+    (let ((inhibit-read-only t))
+      (insert (format "\nDiff finished%s.  %s\n"
+                     (if (equal 0 code) " (no differences)" "")
+                     (current-time-string))))))
 
 ;;;###autoload
 (defun diff (old new &optional switches no-async)
@@ -82,15 +84,15 @@ With prefix arg, prompt for diff switches."
      (setq newf (buffer-file-name)
           newf (if (and newf (file-exists-p newf))
                    (read-file-name
-                    (concat "Diff new file: (default "
-                            (file-name-nondirectory newf) ") ")
+                    (concat "Diff new file (default "
+                            (file-name-nondirectory newf) "): ")
                     nil newf t)
                  (read-file-name "Diff new file: " nil nil t)))
      (setq oldf (file-newest-backup newf)
           oldf (if (and oldf (file-exists-p oldf))
                    (read-file-name
-                    (concat "Diff original file: (default "
-                            (file-name-nondirectory oldf) ") ")
+                    (concat "Diff original file (default "
+                            (file-name-nondirectory oldf) "): ")
                     (file-name-directory oldf) oldf t)
                  (read-file-name "Diff original file: "
                                  (file-name-directory newf) nil t)))
@@ -118,7 +120,8 @@ With prefix arg, prompt for diff switches."
       (set-buffer buf)
       (setq buffer-read-only nil)
       (buffer-disable-undo (current-buffer))
-      (erase-buffer)
+      (let ((inhibit-read-only t))
+       (erase-buffer))
       (buffer-enable-undo (current-buffer))
       (diff-mode)
       (set (make-local-variable 'revert-buffer-function)
@@ -127,21 +130,35 @@ With prefix arg, prompt for diff switches."
       (set (make-local-variable 'diff-old-temp-file) old-alt)
       (set (make-local-variable 'diff-new-temp-file) new-alt)
       (setq default-directory thisdir)
-      (insert command "\n")
+      (let ((inhibit-read-only t))
+       (insert command "\n"))
       (if (and (not no-async) (fboundp 'start-process))
          (progn
            (setq proc (start-process "Diff" buf shell-file-name
                                      shell-command-switch command))
+           (set-process-filter proc 'diff-process-filter)
            (set-process-sentinel
             proc (lambda (proc msg)
                    (with-current-buffer (process-buffer proc)
                      (diff-sentinel (process-exit-status proc))))))
        ;; Async processes aren't available.
-       (diff-sentinel
-        (call-process shell-file-name nil buf nil
-                      shell-command-switch command))))
+       (let ((inhibit-read-only t))
+         (diff-sentinel
+          (call-process shell-file-name nil buf nil
+                        shell-command-switch command)))))
     buf))
 
+(defun diff-process-filter (proc string)
+  (with-current-buffer (process-buffer proc)
+    (let ((moving (= (point) (process-mark proc))))
+      (save-excursion
+       ;; Insert the text, advancing the process marker.
+       (goto-char (process-mark proc))
+       (let ((inhibit-read-only t))
+         (insert string))
+       (set-marker (process-mark proc) (point)))
+      (if moving (goto-char (process-mark proc))))))
+
 ;;;###autoload
 (defun diff-backup (file &optional switches)
   "Diff this file with its backup file or vice versa.