Enable tree sitter code only when it's enabled

[psibi]

No description provided.

[alanz]

This does not work for me. When I apply it locally, flycheck reports that rust-mode-treesitter-derive) is not defined

[alanz]

Perhaps that should be an or?

[alanz]

Adding (require 'rust-mode) gets rid of the warning, but the problem remains.

Turning the and into an or just makes rust-mode not load at all.

I am reluctant to turn on native tree-sitter mode, as I develop some tree-sitter grammars and have the non-native tree-sitter support enabled.

[psibi]

@alanz When do you actually see that warning that was reported by you ? Is it during installation or during some other step (Your latest comment indicates it's during flycheck) ? I can try reproducing it locally for my setup.

I don't think doing or is the right thing here.

[alanz]

I agree or is not the right step, it broke completely.

I see the error on starting up emacs. I guess I need to dig more deeply into the actual origin. And/or go full native tree-sitter.
I will not be able to do any investigation today though

[alanz]

And it seems the warning is benign, I have the functionality I need regardless.

[psibi]

see the error on starting up emacs.

Looking at my Messages buffer - I can see a similar type of warning:

 ■  Warning (treesit): Cannot activate tree-sitter, because language grammar for rust is unavailable (not-found): (libtree-sitter-rust libtree-sitter-rust.0 libtree-sitter-rust.0.0 libtree-sitter-rust.so libtree-sitter-rust.so.0 libtree-sitter-rust.so.0.0) No such file or directory

I receiving the warning even though I'm using a tree sitter based setup. Probably it's able to find the grammars subsequently, not sure.

And it seems the warning is benign, I have the functionality I need regardless.

Thanks for the confirmation, I assumed something was broken. Given the situation, I will close this PR. I would be happy to accept any PR that fixes the warning. :-)

[alanz]

FYI, I switched to emacsformacosx, which has tree-sitter support build in. Without explicitly asking for the tree-sitter mode, I am getting

⛔ Warning (treesit): Cannot activate tree-sitter, because language grammar for rust is unavailable (not-found): (libtree-sitter-rust.so libtree-sitter-rust.so.0 libtree-sitter-rust.so.0.0 libtree-sitter-rust.dylib libtree-sitter-rust.dylib.0 libtree-sitter-rust.dylib.0.0) No such file or directory

Which I guess means I need to work out how to install the language. Is it documented somewhere? A quick scan of the README does not show anything

[alanz]

And it looks like the steps are

init.el

  (setq treesit-language-source-alist
      '((rust "https://github.com/tree-sitter/tree-sitter-rust")
        ))

In emacs
M-x treesit-install-language-grammarPickrust`

[alanz]

My final piece of barrage.

Putting the following into my init.le

(use-package rust-ts-mode
  :custom
  (rust-mode-treesitter-derive t)
...
)
...
(use-package lsp-mode
  :hook (rust-mode rust-ts-mode)
...
)

And basically using rust-ts-mode instead of rust-mode in all config restored

• semantic highlighting
• compile buffer regexp matching
• basic rust-mode operation, such as knowledge of what the normal indent and comment markers are