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Add new user option `diff-entire-buffers'

* lisp/vc/diff.el (diff-entire-buffers): New user option (bug#54060).
(diff-file-local-copy): Use it.
(diff-buffers): Mention it in the doc string.
This commit is contained in:
Lars Ingebrigtsen 2022-03-21 19:28:14 +01:00
parent fd5fe11211
commit a5e8da4fa2

View file

@ -52,6 +52,12 @@ set (`vc-git-diff-switches' for git, for instance), and
"The command to use to run diff."
:type 'string)
(defcustom diff-entire-buffers t
"If non-nil, diff the entire buffers, not just the visible part.
If nil, only use the narrowed-to parts of the buffers."
:type 'boolean
:version "29.1")
;; prompt if prefix arg present
(defun diff-switches ()
(if current-prefix-arg
@ -119,7 +125,9 @@ temporary file with the buffer's contents."
(if (bufferp file-or-buf)
(with-current-buffer file-or-buf
(let ((tempfile (make-temp-file "buffer-content-")))
(write-region nil nil tempfile nil 'nomessage)
(if diff-entire-buffers
(write-region nil nil tempfile nil 'nomessage)
(write-region (point-min) (point-max) tempfile nil 'nomessage))
tempfile))
(file-local-copy file-or-buf)))
@ -274,7 +282,9 @@ interactively for diff switches. Otherwise, the switches
specified in the variable `diff-switches' are passed to the
diff command.
OLD and NEW may each be a buffer or a buffer name."
OLD and NEW may each be a buffer or a buffer name.
Also see the `diff-entire-buffers' variable."
(interactive
(let ((newb (read-buffer "Diff new buffer" (current-buffer) t))
(oldb (read-buffer "Diff original buffer"