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Re: save-excursion and the mark
From: |
Stefan Monnier |
Subject: |
Re: save-excursion and the mark |
Date: |
Tue, 14 Apr 2015 16:16:38 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
> If you are indeed going forward with this change (why is that?),
There are various problems with the previous save-excursion semantics,
all linked to the mark-saving part of it, and this part is useless in
98% of the cases, useful in 1%, and harmful in 1%, so it's better to get
rid of it in my view.
Among the various problems, I actually fixed some recently (before
throwing out the code), but the remaining ones are ugly:
saving/restoring the mark includes saving/restoring the mark-active
state as well, and in the general case you'd also want to run the
(de)activate-mark-hook, which could break even more uses of
save-excursion which never expected it to run such hook code.
> then maybe we could get a save-mark function?
Since you're the only user so far, better write explicitly the exact
saving/restoring you need (especially since it's not obvious to me what
it is you really need, I guess you could start with something along the
lines of (cl-letf (((mark)) (mark-active mark-active)) ...)).
Stefan
- Re: save-excursion and the mark, Magnar Sveen, 2015/04/06
- Re: save-excursion and the mark, Stefan Monnier, 2015/04/07
- Re: save-excursion and the mark, Stefan Monnier, 2015/04/07
- Re: save-excursion and the mark, Magnar Sveen, 2015/04/14
- Re: save-excursion and the mark,
Stefan Monnier <=
- Re: save-excursion and the mark, Magnar Sveen, 2015/04/15
- Re: save-excursion and the mark, Stefan Monnier, 2015/04/15
- Re: save-excursion and the mark, Magnar Sveen, 2015/04/15
- Re: save-excursion and the mark, Stefan Monnier, 2015/04/15
- Re: save-excursion and the mark, Daniel Colascione, 2015/04/17
- Re: save-excursion and the mark, Richard Stallman, 2015/04/15
- Re: save-excursion and the mark, Phillip Lord, 2015/04/15
- Re: save-excursion and the mark, Oleh Krehel, 2015/04/19
- Re: save-excursion and the mark, Stefan Monnier, 2015/04/19
- Re: save-excursion and the mark, Andreas Röhler, 2015/04/20