* ediff-util.el (ediff-compute-custom-diffs-maybe): Avoid creating

	temporary file for buffer already visiting one.  This change makes
	output likely to be directly usable by patch program.
	Suggested by Adrian Aichner  <adrian@xemacs.org>

2 files changed, 23 insertions, 12 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 33be71476c9..ae590cde276 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2003-02-19  Michael Kifer  <kifer@cs.stonybrook.edu>
+
+        * ediff-util.el (ediff-compute-custom-diffs-maybe): Avoid creating
+        temporary file for buffer already visiting one.  This change makes
+        output likely to be directly usable by patch program.
+        Suggested by Adrian Aichner  <adrian@xemacs.org>
+        
 2004-02-20  Nick Roberts  <nick@nick.uklinux.net>
 
         * gdb-ui.el (gdb-use-colon-colon-notation): Set default to nil for
diff --git a/lisp/ediff-util.el b/lisp/ediff-util.el
index 9550e65c2e9..79f85cc1896 100644
--- a/lisp/ediff-util.el
+++ b/lisp/ediff-util.el
@@ -3401,29 +3401,33 @@ Without an argument, it saves customized diff argument, if available
   (let ((buf-A-file-name (buffer-file-name ediff-buffer-A))
         (buf-B-file-name (buffer-file-name ediff-buffer-B))
         file-A file-B)
-    (if (stringp buf-A-file-name)
-        (setq buf-A-file-name (file-name-nondirectory buf-A-file-name)))
-    (if (stringp buf-B-file-name)
-        (setq buf-B-file-name (file-name-nondirectory buf-B-file-name)))
-    (setq file-A (ediff-make-temp-file ediff-buffer-A buf-A-file-name)
-          file-B (ediff-make-temp-file ediff-buffer-B buf-B-file-name))
-
+    (unless (and buf-A-file-name (file-exists-p buf-A-file-name))
+      (setq file-A
+            (ediff-make-temp-file ediff-buffer-A)))
+    (unless (and buf-B-file-name (file-exists-p buf-B-file-name))
+      (setq file-B
+            (ediff-make-temp-file ediff-buffer-B)))
     (or (ediff-buffer-live-p ediff-custom-diff-buffer)
         (setq ediff-custom-diff-buffer
               (get-buffer-create
                (ediff-unique-buffer-name "*ediff-custom-diff" "*"))))
     (ediff-with-current-buffer ediff-custom-diff-buffer
-      (setq buffer-read-only nil)
-      (erase-buffer))
+                               (setq buffer-read-only nil)
+                               (erase-buffer))
     (ediff-exec-process
      ediff-custom-diff-program ediff-custom-diff-buffer 'synchronize
-     ediff-custom-diff-options file-A file-B)
+     ediff-custom-diff-options
+     ;; repetition of buf-A-file-name is needed so it'll return a file
+     (or (and buf-A-file-name (file-exists-p buf-A-file-name) buf-A-file-name)
+         file-A)
+     (or (and buf-B-file-name (file-exists-p buf-B-file-name) buf-B-file-name)
+         file-B))
     ;; put the diff file in diff-mode, if it is available
     (if (fboundp 'diff-mode)
         (with-current-buffer ediff-custom-diff-buffer
           (diff-mode)))
-    (delete-file file-A)
-    (delete-file file-B)
+    (and file-A (file-exists-p file-A) (delete-file file-A))
+    (and file-B (file-exists-p file-B) (delete-file file-B))
     ))
 
 (defun ediff-show-diff-output (arg)