Automatic indentation of tree-sitter doesn't work well.

[DrScKAWAMOTO]

Dear everyone.

Automatic indentation of tree-sitter doesn't work well for me.
I tried it in two environments, and neither worked properly.

• homebrew cask emacs 29.3 on MacBookAir M1 2020 Sonoma 14.4.1
• emacs 29.1 on FreeBSD 13.2-RELEASE-p3

I have elpa package ~/.emacs.d/elpa/treesit-auto-20240511.1425 .
I have the following language bundles in ~/.emacs.d/tree-sitter on MacBookAir,

-rwxr-xr-x 1 XXXXX staff 664K  5 23 17:41 libtree-sitter-c.dylib
-rwxr-xr-x 1 XXXXX staff 3.8M  5 23 17:41 libtree-sitter-cpp.dylib
-rwxr-xr-x 1 XXXXX staff 648K  5 23 17:44 libtree-sitter-python.dylib

and on FreeBSD,

-rwxr-xr-x 1 XXXXX XXXXX 618K May 23 23:12 libtree-sitter-c.so
-rwxr-xr-x 1 XXXXX XXXXX 3.7M May 23 23:12 libtree-sitter-cpp.so

I have a simple ~/.emacs.d/init.el the follows,

(use-package treesit
  :config
  (setq treesit-font-lock-level 4))

(use-package treesit-auto
  :ensure t
  :config
  (setq treesit-auto-install t)
  (global-treesit-auto-mode))

The steps to reproduce are as follows.

1. Start emacs.
2. Open the C source code file and write the following content.

void test(void)
{
  do🔳

3. Place the cursor after do and press Return.

Expected behaviour is automatic indentation. I want to move the cursor to the 5th column of the next line.
However, the observed behavior is NOT indentation. The cursor moves to the 1st column of the next line.
For reference, the column position of do was moved correctly the 3rd column with automatic indentation.

Thanx.

[jcs090218]

Treesit.el and tree-sitter.el are two different implementations. Suppose you are looking to report issues to treesit.el, you should directly report to emacs-devel.

[sogaiu]

It's been a while since I've used do in C, but isn't it necessary to have more curly braces, like this:

void test(void)
{
  do {
    func();
  } while (1);
}

With the curly braces in place, does it work ok for you?

[DrScKAWAMOTO]

I am using gnu style (M-x c-ts-mode-set-style)

void test(void)
{
  do
  {
    func();
  }
  while (1);
}

is the result.
I needed one is the following,

void test(void)
{
  do
    {
      func();
    }
  while (1);
}

[DrScKAWAMOTO]

These operations are ok in c-mode.
Even in c-ts-mode, if I use tab to format it, it will work as I intended.

[DrScKAWAMOTO]

We have digressed into a topic that has nothing to do with tree-sitter.el.
I would like to try writing an init.el that uses tree-sitter.el.

Thanx Esq. sogaiu.
Thanx everyone.

[sogaiu]

Regarding c-ts-mode's behavior, I suggest asking or reporting on one of the gnu emacs mailing lists, perhaps bug-gnu-emacs would be appropriate.

I see in some search results of the archives there that c-ts-mode is being discussed.

---

I don't know if tree-sitter.el and friends work any better and I don't have a good way of testing that out ATM. May be someone else knows though.