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Make revert-buffer ('g') keep point in VC diff buffers

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* lisp/vc/vc.el (vc-diff-restore-buffer): New function.
(vc-diff-finish): Update its calling convention to include an
optional 'oldbuf' parameter, and handle it.
(vc-diff-internal): Pass a clone of the incumbent vc-diff
buffer to 'vc-diff-finish' (bug#28852).
This commit is contained in:
Charles A. Roelli 2022-01-29 16:47:52 +01:00 • committed by Lars Ingebrigtsen
parent 7608b77d9e
commit a836e8bf0c
1 changed files with 27 additions and 4 deletions
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31
lisp/vc/vc.el
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@ -1742,7 +1742,20 @@ BUFFER defaults to the current buffer."
"Functions run at the end of the diff command.
Each function runs in the diff output buffer without args.")
(defun vc-diff-finish (buffer messages)
(defun vc-diff-restore-buffer (original new)
"Restore point in buffer NEW to where it was in ORIGINAL.
This function works by updating buffer ORIGINAL with the contents
of NEW (without destroying existing markers), swapping their text
objects, and finally killing buffer ORIGINAL."
(with-current-buffer original
(let ((inhibit-read-only t))
(replace-buffer-contents new)))
(with-current-buffer new
(buffer-swap-text original))
(kill-buffer original))
(defun vc-diff-finish (buffer messages &optional oldbuf)
;; The empty sync output case has already been handled, so the only
;; possibility of an empty output is for an async process.
(when (buffer-live-p buffer)
@ -1754,7 +1767,11 @@ Each function runs in the diff output buffer without args.")
(message "%s" (cdr messages))))
(diff-setup-whitespace)
(diff-setup-buffer-type)
(goto-char (point-min))
;; `oldbuf' is the buffer that used to show this diff. Make
;; sure that we restore point in it if it's given.
(if oldbuf
(vc-diff-restore-buffer oldbuf buffer)
(goto-char (point-min)))
(run-hooks 'vc-diff-finish-functions))
(when (and messages (not emptyp))
(message "%sdone" (car messages))))))
@ -1779,7 +1796,12 @@ Return t if the buffer had changes, nil otherwise."
;; but the only way to set it for each file included would
;; be to call the back end separately for each file.
(coding-system-for-read
(if files (vc-coding-system-for-diff (car files)) 'undecided)))
(if files (vc-coding-system-for-diff (car files)) 'undecided))
(orig-diff-buffer-clone
(if (and (get-buffer buffer) revert-buffer-in-progress-p)
(with-current-buffer buffer
(clone-buffer
(generate-new-buffer-name " *vc-diff-clone*") nil)))))
;; On MS-Windows and MS-DOS, Diff is likely to produce DOS-style
;; EOLs, which will look ugly if (car files) happens to have Unix
;; EOLs.
@ -1840,7 +1862,8 @@ Return t if the buffer had changes, nil otherwise."
;; after `pop-to-buffer'; the former assumes the diff buffer is
;; shown in some window.
(let ((buf (current-buffer)))
(vc-run-delayed (vc-diff-finish buf (when verbose messages))))
(vc-run-delayed (vc-diff-finish buf (when verbose messages)
orig-diff-buffer-clone)))
;; In the async case, we return t even if there are no differences
;; because we don't know that yet.
t)))