Re: save-excursion and the mark

[Artur Malabarba]

2015-02-23 23:14 GMT+00:00 Oleh Krehel <address@hidden>:
> Stefan Monnier <address@hidden> writes:
>
>>> I have a package that might be using the feature.
>>
>> Where and how?
>
> It's at https://github.com/abo-abo/lispy. There's a bunch of functions
> that manipulate the active region sexp-wise. Some of them might use the
> fact that the mark is restored. I can't be sure until I get a
> `save-excursion' version that doesn't touch the mark.

I think the following should do it.

(cl-letf* (((point-marker))
          ((current-buffer)))
    ;; Your code here.
    )

> Supposing that you would disable the mark storing/restoring in
> `save-excursion', I rewrote my code to save/restore the mark on top of
> that. It didn't hurt the tests.
It couldn't have hut the tests, given that it's redundant :-) (for now
at least).


> It was hard for me to write my own `save-excursion' in Elisp to
> completely test it, since it's not obvious how it works when chunks of
> text are deleted.

I think it just follows the point marker. Test the snippet above and
see if it works for you.