From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Kevin Rodgers <kevin.d.rodgers@gmail.com>
Cc: 4587@emacsbugs.donarmstrong.com, bug-gnu-emacs@gnu.org
Subject: bug#4587: Antwort: Re: bug#4587: 23.1; sort-lines and sort-fields always set buffer modified
Date: Thu, 01 Oct 2009 10:19:32 -0400 [thread overview]
Message-ID: <jwvocor6w42.fsf-monnier+emacsbugreports@gnu.org> (raw)
In-Reply-To: <ha274l$hr3$1@ger.gmane.org> (Kevin Rodgers's message of "Thu, 01 Oct 2009 06:25:59 -0600")
>> I'd indeed expect that to implement the feature you request, the code
>> would have to do something like that. Most likely not copying the text
>> itself, but instead storing an md5 or somesuch hash of the text.
> Not suitable for Emacs, but maybe useful for Roland:
> (defadvice sort-lines (around restore-buffer-modified-p activate)
> (let* ((buffer-was-modified-p (buffer-modified-p))
> (buffer-was-not-modified-md5 (if (not buffer-was-modified-p)
> (md5 (current-buffer)))))
> ad-do-it
> (when (and (not buffer-was-modified-p)
> (buffer-modified-p)
> (not (equal buffer-was-not-modified-md5 (md5 (current-buffer)))))
> (restore-buffer-modified-p buffer-was-modified-p))))
Maybe we could make it suitable, turn it into a macro and use it around
the various candidates. AFAICT, here are the problems I see with it:
- the call to md5 should use as much as possible the internal encoding.
I.e. at least pass an `emacs-internal' arg, tho it would be even
better to let md5 work directly on the internal representation.
- it should only work on the afected region rather than the whole buffer
(i.e. it needs start..end arguments).
- should it fiddle with the undo list? or even revert the whole
"without-effect" set of changes (the changes may result in the same
final text, but they may very well have moved markers and changed
text-properties, and it might be desirable to undo those changes, so
as to better pretend nothing happened).
-- Stefan
next prev parent reply other threads:[~2009-10-01 14:19 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-29 16:38 bug#4587: 23.1; sort-lines and sort-fields always set buffer modified Roland.Meier
2009-09-30 4:44 ` Stefan Monnier
2009-09-30 10:00 ` bug#4597: Antwort: " Roland.Meier
2009-09-30 13:51 ` bug#4587: " Stefan Monnier
2009-10-01 12:25 ` Kevin Rodgers
2009-10-01 14:19 ` Stefan Monnier [this message]
2009-10-25 13:41 ` Kevin Rodgers
2009-10-25 15:27 ` Stefan Monnier
2009-09-30 16:56 ` bug#4597: " Magnus Henoch
2022-05-03 19:24 ` bug#4587: " Lars Ingebrigtsen
2022-05-04 7:21 ` Eli Zaretskii
2022-05-04 7:53 ` Lars Ingebrigtsen
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