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bug#59662: 29.0.50; [PATCH] Add treesit--indent-defun
From: |
Theodor Thornhill |
Subject: |
bug#59662: 29.0.50; [PATCH] Add treesit--indent-defun |
Date: |
Tue, 29 Nov 2022 13:14:21 +0100 |
Eli Zaretskii <eliz@gnu.org> writes:
>> Cc: eliz@gnu.org, casouri@gmail.org
>> From: Theodor Thornhill <theo@thornhill.no>
>> Date: Mon, 28 Nov 2022 20:32:01 +0100
>>
>> I've added a function to treesit.el, for use in
>> treesit-major-mode-setup. Because the treesit-defun-type-regexp gives
>> us "defuns" for free, we can set fill-paragraph-function to this new
>> function, thus enabling quick formatting, and some sensible default for
>> fill-paragraph. It aims to mirror c-indent-defun.
>>
>> I think this is a nice way to get this functionality for free, but I'm
>> not 100% whether this is considered ok or not.
>
> Sounds good, but why did you think it wouldn't be OK? Anything here that
> doesn't meet the eye?
>
Not really, but see below answer.
>> An alternative could be to add a 'treesit-mode-map' where we can
>> auto-enable such constructs.
>
> I think this is less desirable.
>
> Yuan, WDYT?
>
>> @@ -1698,7 +1713,10 @@ treesit-major-mode-setup
>> ;; Navigation.
>> (when treesit-defun-type-regexp
>> (setq-local beginning-of-defun-function #'treesit-beginning-of-defun)
>> - (setq-local end-of-defun-function #'treesit-end-of-defun)))
>> + (setq-local end-of-defun-function #'treesit-end-of-defun))
>> + ;; Filling
>> + (when (and treesit-defun-type-regexp treesit-simple-indent-rules)
>> + (setq-local fill-paragraph-function #'treesit--indent-defun)))
>
> I'm a bit confused: if the function's name is treesit--indent-defun, and it
> uses treesit-indent-region to do its job, why do we assign it to
> fill-paragraph-function, which is supposed to _fill_, not to _indent_?
This is why I was thinking it would maybe be better to put it into a
treesit-mode-map that major-modes can inherit from, thus binding it to
things such as C-c C-q. The reason I put it in filling was because that
is a common key to press in everything _but_ prog-modes. And prog-modes
seem to mostly just turn it off if not inside of comments etc. This
would behave just like that, except we would reformat/reindent/refill
code.
In a way filling _is_ formatting/reindenting, at least that's how I look
at it.
Theo