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Check that the buffer in diff-buffer-with-file is visiting a file

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* 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).
This commit is contained in:
Daniel Martín 2020-09-15 14:56:10 +02:00 • committed by Lars Ingebrigtsen
parent e408f2fab2
commit d727d3dad6
1 changed files with 2 additions and 0 deletions
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lisp/vc/diff.el
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@ -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