From d727d3dad649d1569a6babaf398439d101e282d4 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Daniel=20Mart=C3=ADn?= <mardani29@yahoo.es>
Date: Tue, 15 Sep 2020 14:56:10 +0200
Subject: [PATCH] Check that the buffer in diff-buffer-with-file is visiting a
file
* lisp/vc/diff.el (diff-buffer-with-file): Signal a specific error
when the buffer passed to diff-buffer-with-file is not visiting a
file (bug#43401).
---
lisp/vc/diff.el | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lisp/vc/diff.el b/lisp/vc/diff.el
index 469888078c4..b7f17bf3c73 100644
--- a/lisp/vc/diff.el
+++ b/lisp/vc/diff.el
@@ -258,6 +258,8 @@ This requires the external program `diff' to be in your `exec-path'."
(interactive "bBuffer: ")
(let ((buf (get-buffer (or buffer (current-buffer)))))
(with-current-buffer (or (buffer-base-buffer buf) buf)
+ (unless buffer-file-name
+ (error "Buffer is not visiting a file"))
(diff buffer-file-name (current-buffer) nil 'noasync))))
;;;###autoload
--
2.39.5