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

[Daniel Martín]

Theodor Thornhill via "Bug reports for GNU Emacs, the Swiss army knife
of text editors" <bug-gnu-emacs@gnu.org> writes:

>>
>> Why in lisp.el? we are talking about a feature of C-like languages.  The
>> current binding of "C-c C-q" is in cc-cmds.el, so what I had in mind is to
>> have its counterpart in c-ts-mode.el.
>
> Something like this?

Thanks, some comments below:

>
> From 26a8780950017a911bac7290366da05e0e35f13f Mon Sep 17 00:00:00 2001
> From: Theodor Thornhill <theo@thornhill.no>
> Date: Fri, 2 Dec 2022 16:05:35 +0100
> Subject: [PATCH] Add c-ts-mode--indent-defun
>
> Add in this function to mimic 'c-indent-defun'
>
> * lisp/progmodes/c-ts-mode.el (c-ts-mode--indent-defun): New function.
> (c-ts-mode-map): New mode map that uses said function.
> ---
>  lisp/progmodes/c-ts-mode.el | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
> index fcabb5beac..3171600901 100644
> --- a/lisp/progmodes/c-ts-mode.el
> +++ b/lisp/progmodes/c-ts-mode.el
> @@ -518,9 +518,25 @@ c-ts-mode--end-of-defun
>        (if (looking-at "\\s<\\|\n")
>         (forward-line 1)))))
>  
> +(defun c-ts-mode--indent-defun ()

This should be public: c-ts-mode-indent-defun

> +  "Indent the current top-level declaration syntactically.
> +
> +`treesit-defun-type-regexp' defines what constructs to indent."
> +  (interactive)

(interactive "*") will handle read-only buffers a bit better.

> +  (save-excursion
> +    (mark-defun)
> +    (indent-region (region-beginning) (region-end))))

Nit: Once you call (mark-defun), you can call

(indent-region (point) (mark))

which should be more efficient than calling (region-beginning) or
(region-end).