bug#59662: 29.0.50; [PATCH] Add treesit--indent-defun

[Yuan Fu <casouri@gmail.com>]

> On Dec 7, 2022, at 12:06 PM, Theodor Thornhill <theo@thornhill.no> wrote:
> 
> Yuan Fu <casouri@gmail.com> writes:
> 
>> Theodor Thornhill <theo@thornhill.no> writes:
>> 
>>> Eli Zaretskii <eliz@gnu.org> writes:
>>> 
>>>>> From: Theodor Thornhill <theo@thornhill.no>
>>>>> Cc: "Theodor Thornhill via Bug reports for GNU Emacs, the Swiss army knife
>>>>> of text editors" <bug-gnu-emacs@gnu.org>, Eli Zaretskii <eliz@gnu.org>,
>>>>> casouri@gmail.com, 59662@debbugs.gnu.org
>>>>> Date: Sun, 04 Dec 2022 13:33:35 +0100
>>>>> 
>>>>> Theodor Thornhill <theo@thornhill.no> writes:
>>>>> 
>>>>>> On 2 December 2022 22:09:55 CET, "Daniel Martín" <mardani29@yahoo.es> wrote:
>>>>>>> Theodor Thornhill <theo@thornhill.no> writes:
>>>>>>> 
>>>>>>>> Right - thanks.  However, this makes me wonder - should we really be
>>>>>>>> setting mark here? I see that c-indent-defun does not, and it feels
>>>>>>>> weird that indenting adds to the mark ring.  What do you think?  My
>>>>>>>> first patch used
>>>>>>>> 
>>>>>>>> (indent-region
>>>>>>>>  (treesit-node-start node)
>>>>>>>>  (treesit-node-end node))
>>>>>>>> 
>>>>>>>> Which behaves similarly to c-indent-defun.
>>>>>>>> 
>>>>>>>> See attached patch.
>>>>>>> 
>>>>>>> I don't have a strong opinion, but if we can indent without setting the
>>>>>>> mark, I think it'd be a cleaner command.  Specially if c-indent-defun
>>>>>>> doesn't set the mark either.
>>>>>> 
>>>>>> Yeah, we don't need to set the mark. Thanks for the feedback :)
>>>>>> Theo
>>>>> 
>>>>> Eli, do you have any opinion on this matter? Should we implement this
>>>>> function without using marks?  That will make the function a smidge
>>>>> bigger, but would not mess up the mark-ring.  I think that's desirable,
>>>>> at least.
>>>> 
>>>> IMO, it is better not to set the mark, indeed.
>>> 
>>> Agreed, see attached patch.  What do you think, Yuan and Eli?
>>> 
>>> Should we expose the internal helper I used, or maybe this function
>>> could just as well live in treesit.c?
>>> 
>>> Theo
>>> 
>> 
>> Very nice, I applied this patch with some changes to the function. I
>> think using treesit-beginning/end-of-defun is more robust.
>> 
>> Yuan
> 
> Thanks!  Would you mind describing why?

Yes, sorry. I’m planning to change treesit-beginning-of-defun and treesit-end-of-defun so they can behave differently according to user configuration, basically they can decide whether to skip nested defuns or not. If we use these functions rather than re-implementing their logic (to some extent) in c-ts-mode-indent-defun, any improvement to defun navigation would automatically benefit c-ts-mode-indent-defun.

Yuan