From: "Clément Pit--Claudel" <clement.pit@gmail.com>
To: emacs-devel@gnu.org
Subject: Re: Don't complain about changed file when it hasn't changed
Date: Sun, 28 Aug 2016 23:36:23 -0400 [thread overview]
Message-ID: <031d3e59-eaa3-df7a-492d-2a2d3c726094@gmail.com> (raw)
In-Reply-To: <jwvy43g2ze5.fsf-monnier+emacs@gnu.org>
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On 2016-08-28 20:29, Stefan Monnier wrote:
> The patch below is supposed to change Emacs such that if the file's
> timestamp has changed, but the contents is still the same, it doesn't
> prompt the user about a supersession-threat.
>
> Any objection?
This sounds like a neat feature! Are you sure you want (point-min) and (point-max) rather than 1 and (buffer-size), though?
Also, maybe this should be predicated on a test for small-enough files? For large-ish files, it could make things slow.
Clément.
> diff --git a/lisp/userlock.el b/lisp/userlock.el
> index a0c55fd..9b45ef4 100644
> --- a/lisp/userlock.el
> +++ b/lisp/userlock.el
> @@ -97,6 +97,20 @@ ask-user-about-lock-help
>
> (define-error 'file-supersession nil 'file-error)
>
> +(defun userlock--check-content-unchanged (fn)
> + (save-restriction
> + (widen)
> + (let ((buf (current-buffer))
> + (start (point-min))
> + (end (point-max)))
> + (when (with-temp-buffer
> + (insert-file-contents fn)
> + (= 0 (compare-buffer-substrings
> + buf start end
> + (current-buffer) (point-min) (point-max))))
> + (set-visited-file-modtime)
> + 'unchanged))))
> +
> ;;;###autoload
> (defun ask-user-about-supersession-threat (fn)
> "Ask a user who is about to modify an obsolete buffer what to do.
> @@ -106,30 +120,30 @@ ask-user-about-supersession-threat
>
> You can rewrite this to use any criterion you like to choose which one to do.
> The buffer in question is current when this function is called."
> - (discard-input)
> - (save-window-excursion
> - (let ((prompt
> - (format "%s changed on disk; \
> + (unless (userlock--check-content-unchanged fn)
> + (discard-input)
> + (save-window-excursion
> + (let ((prompt
> + (format "%s changed on disk; \
> really edit the buffer? (y, n, r or C-h) "
> - (file-name-nondirectory fn)))
> - (choices '(?y ?n ?r ?? ?\C-h))
> - answer)
> - (while (null answer)
> - (setq answer (read-char-choice prompt choices))
> - (cond ((memq answer '(?? ?\C-h))
> - (ask-user-about-supersession-help)
> - (setq answer nil))
> - ((eq answer ?r)
> - ;; Ask for confirmation if buffer modified
> - (revert-buffer nil (not (buffer-modified-p)))
> - (signal 'file-supersession
> - (list "File reverted" fn)))
> - ((eq answer ?n)
> - (signal 'file-supersession
> - (list "File changed on disk" fn)))))
> - (message
> - "File on disk now will become a backup file if you save these changes.")
> - (setq buffer-backed-up nil))))
> + (file-name-nondirectory fn))))
> + (while
> + (let ((answer (read-char-choice prompt '(?y ?n ?r ?? ?\C-h))))
> + (cond ((memq answer '(?? ?\C-h))
> + (ask-user-about-supersession-help)
> + 'repeat)
> + ((eq answer ?r)
> + ;; Ask for confirmation if buffer modified
> + (revert-buffer nil (not (buffer-modified-p)))
> + (signal 'file-supersession
> + (list "File reverted" fn)))
> + ((eq answer ?n)
> + (signal 'file-supersession
> + (list "File changed on disk" fn)))
> + (t (null answer)))))
> + (message
> + "File on disk now will become a backup file if you save these changes.")
> + (setq buffer-backed-up nil)))))
>
> (defun ask-user-about-supersession-help ()
> (with-output-to-temp-buffer "*Help*"
>
>
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next prev parent reply other threads:[~2016-08-29 3:36 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-29 0:29 Don't complain about changed file when it hasn't changed Stefan Monnier
2016-08-29 3:36 ` Clément Pit--Claudel [this message]
2016-08-29 3:39 ` Daniel Colascione
2016-08-29 3:43 ` Clément Pit--Claudel
2016-08-29 6:44 ` Michael Albinus
2016-08-29 14:42 ` Eli Zaretskii
2016-08-29 16:18 ` Michael Albinus
2016-08-29 17:42 ` Davis Herring
2016-08-29 17:57 ` Clément Pit--Claudel
2016-08-29 19:10 ` Davis Herring
2016-08-29 13:17 ` Stefan Monnier
2016-08-30 9:20 ` Michael Albinus
2016-08-30 15:00 ` Stefan Monnier
2016-08-30 13:40 ` Clément Pit--Claudel
2016-08-30 15:01 ` Stefan Monnier
2016-08-30 15:23 ` Clément Pit--Claudel
2016-08-30 15:48 ` Stefan Monnier
2016-08-30 16:55 ` Eli Zaretskii
2016-08-30 16:11 ` Eli Zaretskii
2016-08-30 16:38 ` Clément Pit--Claudel
2016-08-29 14:34 ` Eli Zaretskii
2016-08-29 14:50 ` Stefan Monnier
2016-08-30 15:26 ` Eli Zaretskii
2016-08-30 15:44 ` Stefan Monnier
2016-08-30 16:15 ` Eli Zaretskii
2016-08-30 17:13 ` Stefan Monnier
2016-08-30 17:26 ` Eli Zaretskii
2016-08-30 18:02 ` Stefan Monnier
2016-08-30 15:46 ` Stefan Monnier
2016-08-30 16:19 ` Eli Zaretskii
2016-08-30 17:16 ` Stefan Monnier
2016-08-30 17:32 ` Eli Zaretskii
2016-08-30 18:06 ` Stefan Monnier
2016-09-01 13:49 ` Eli Zaretskii
2016-09-02 15:22 ` Stefan Monnier
2016-09-02 15:26 ` Eli Zaretskii
2016-09-02 15:44 ` Stefan Monnier
2016-09-02 15:39 ` Joost Kremers
2016-08-29 16:01 ` Stefan Monnier
2016-08-29 16:26 ` Eli Zaretskii
2016-08-30 0:35 ` Stefan Monnier
2016-08-29 17:50 ` Davis Herring
2016-08-29 18:09 ` Eli Zaretskii
2016-08-29 19:22 ` Davis Herring
2016-08-30 0:39 ` Stefan Monnier
2016-08-30 7:55 ` Andreas Schwab
2016-08-30 0:37 ` Stefan Monnier
2016-08-30 1:23 ` Rolf Ade
2016-08-30 15:12 ` Eli Zaretskii
2016-08-30 15:34 ` Clément Pit--Claudel
2016-08-30 16:14 ` Eli Zaretskii
2016-09-06 16:29 ` John Wiegley
2016-09-06 17:50 ` Stefan Monnier
2016-09-06 17:52 ` John Wiegley
2016-09-06 19:00 ` Andreas Röhler
2016-09-06 21:00 ` Stefan Monnier
2016-09-06 21:29 ` Drew Adams
2016-09-06 21:41 ` Karl Fogel
2016-09-06 21:59 ` Paul Eggert
2016-09-06 22:01 ` Karl Fogel
2016-09-06 22:07 ` Davis Herring
2016-09-06 22:21 ` Karl Fogel
2016-09-06 22:46 ` Clément Pit--Claudel
2016-09-07 0:24 ` Stefan Monnier
2016-09-07 16:49 ` Karl Fogel
2016-09-07 18:41 ` Andreas Röhler
2016-09-07 20:02 ` Karl Fogel
2016-09-06 22:03 ` Karl Fogel
2016-12-24 1:03 ` Rolf Ade
2016-12-25 15:44 ` Stefan Monnier
2016-12-26 0:29 ` Rolf Ade
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