bug#59763: 29.0.60; Filling for c-ts-mode

[Yuan Fu]

Theodor Thornhill <theo@thornhill.no> writes:

> On 25 December 2022 02:30:35 CET, Yuan Fu <casouri@gmail.com> wrote:
>>
>>Theodor Thornhill <theo@thornhill.no> writes:
>>
>>> On 24 December 2022 09:36:21 CET, Yuan Fu <casouri@gmail.com> wrote:
>>>>
>>>>Theodor Thornhill <theo@thornhill.no> writes:
>>>>
>>>>> Yuan Fu <casouri@gmail.com> writes:
>>>>>
>>>>>>> On Dec 2, 2022, at 6:58 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>>>>>>> 
>>>>>>>> From: Yuan Fu <casouri@gmail.com>
>>>>>>>> Date: Thu, 1 Dec 2022 21:33:06 -0800
>>>>>>>> 
>>>>>>>> 
>>>>>>>> IMO For c-ts-mode to be usable we need to have at least a basic filling
>>>>>>>> function. Below is the function I have in my init.el, could someone 
>>>>>>>> have
>>>>>>>> a look and see if it’s good? Alternatively we could copy out the 
>>>>>>>> comment
>>>>>>>> and fill it in a temp buffer with c-mode, but I didn’t have the time 
>>>>>>>> to try
>>>>>>>> it out and see how well it works.
>>>>>>> 
>>>>>>> Thanks.
>>>>>>> 
>>>>>>> From quick testing, I see a problem:
>>>>>>> 
>>>>>>>  . Visit dispnew.c and go to the comment that starts on line 324.  
>>>>>>> Delete
>>>>>>>    the newline between the two lines of the comment, and invoke the
>>>>>>>    function.  Observe how the first non-blank character of the comment's
>>>>>>>    second line is aligned with the "/*" on the previous line, not with 
>>>>>>> the
>>>>>>>    text after "/*" as I'd expect.
>>>>>>
>>>>>> I see. I’ll need to look at how cc-mode fill comments.
>>>>>>
>>>>>>> 
>>>>>>> Btw, this command should be bound to M-q in ts-c-mode.
>>>>>>
>>>>>> Will do, once our fill function works well. BTW, Theo, if you have any
>>>>>> idea, don’t hesitate to go ahead :-) No obligations, of course.
>>>>>>
>>>>>> Yuan
>>>>>
>>>>> Sure!  Added to my list :)  I had a function at some point that used
>>>>> c-mode to do this. I'll see if I can polish it a little.
>>>>
>>>>I did some work in filling, it should work like cc-mode in like 90% of
>>>>the cases now, yay!
>>>>
>>>>Yuan
>>>
>>> Nice! For all cc-ts-modes?
>>
>>I only added for c and c++, but support for other modes should be
>>identical. And I think we should have something equivalent to cc-mode’s
>>init which sets up things that are the same in all C-like languages,
>>basically comments and filling.

I added indent and filling for other C-like modes.

>>But I wonder where should we put it, I guess it’s fine to leave it in
>>c-ts-mode, since there really isn’t much code. Having other modes to
>>require c-ts-mode shouldn’t be a big problem, I think?
>>
>>Yuan
>
> How about just having treesit-utils.el, or something like that? There
> are probably many things in the future that will be common among
> modes, yet won't really warrant inheritance. I think we have such an
> example in js/typescript too, iirc.

If it’s shared across all tree-sitter modes, it should be in treesit.el,
of course. We are talking about things shared by tree-sitter C-like
modes, so the scope is smaller.

Since right now it’s only a handful functions, I made other modes
require c-ts-mode.el. In the future if things accumulate, we can put
things into a separate file (c-ts-mode-common.el or something).

Yuan