(ediff-backup): New autoloaded command.

2 files changed, 23 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 553da0faa22..45f8b368256 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2002-07-31  Markus Rost  <rost@math.ohio-state.edu>
+
+        * help-fns.el (describe-function-1): Test function for
+        obsolescence only if it is a symbol.
+
+        * ediff.el (ediff-backup): New autoloaded command.
+
 2002-07-31  Richard M. Stallman  <rms@gnu.org>
 
         * emacs-lisp/bytecomp.el (byte-compile-find-cl-functions):
diff --git a/lisp/ediff.el b/lisp/ediff.el
index 2db82f85547..5b0f85d05cd 100644
--- a/lisp/ediff.el
+++ b/lisp/ediff.el
@@ -367,6 +367,22 @@
 ;;;###autoload
 (defalias 'ediff 'ediff-files)
 
+;;;###autoload
+(defun ediff-backup (file)
+  "Run Ediff on FILE and its backup file.
+Uses the latest backup, if there are several numerical backups.
+If this file is a backup, `ediff' it with its original."
+  (interactive (list (read-file-name "Ediff (file with backup): ")))
+  ;; The code is taken from `diff-backup'.
+  (require 'diff)
+  (let (bak ori)
+    (if (backup-file-name-p file)
+        (setq bak file
+              ori (file-name-sans-versions file))
+      (setq bak (or (diff-latest-backup-file file)
+                    (error "No backup found for %s" file))
+            ori file))
+    (ediff-files bak ori)))
 
 ;;;###autoload
 (defun ediff-buffers (buffer-A buffer-B &optional startup-hooks job-name)