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bug#4587: Antwort: Re: bug#4587: 23.1; sort-lines and sort-fields always
bug#4587: Antwort: Re: bug#4587: 23.1; sort-lines and sort-fields always set buffer modified
Thu, 01 Oct 2009 10:19:32 -0400
Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux)
>> 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)))))
> (when (and (not buffer-was-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).