State of tree-sitter modes in Emacs 30

[dschrempf]

Hi!

I am a happy user of treesit-auto, and I recently switched to Emacs 30. From the treesit-auto readme, I understand that activating tree sitter modes should become easier in Emacs 30. But as far as I can see, it is still necessary to edit auto-mode-alist or major-mode-remap-alist.

There is also a recent discussion on emacs-devel about major-mode-remap-defaults, which is similar to major-mode-remap-alist, but managed by package developers, and not users.

What is the easiest way to activate tree sitter in all mode possible? Is it still treesit-auto? Is there some information I am missing? Thanks for your help.

[bbatsov]

I did a bit of digging around and it seems treesit-auto will still be needed, as the alternative is going to be have something like this in your config (major-mode-remap-defaults is the new option in Emacs 30):

;; Enable tree-sitter globally
(global-tree-sitter-mode)

;; Enable use of tree-sitter modes by default when available
(setq major-mode-remap-defaults t)

;; Install missing grammars
(setq treesit-language-source-alist
      '((python "https://github.com/tree-sitter/tree-sitter-python")
        (javascript "https://github.com/tree-sitter/tree-sitter-javascript")
        (typescript "https://github.com/tree-sitter/tree-sitter-typescript")
        (css "https://github.com/tree-sitter/tree-sitter-css")
        (rust "https://github.com/tree-sitter/tree-sitter-rust")
        (go "https://github.com/tree-sitter/tree-sitter-go")))

;; Function to install missing grammars
(defun my/install-treesit-grammars ()
  (interactive)
  (dolist (grammar treesit-language-source-alist)
    (let ((lang (car grammar)))
      (unless (treesit-language-available-p lang)
        (treesit-install-language-grammar lang)))))

;; Call this function to install missing grammars
(my/install-treesit-grammars)

;; Optionally, add any additional mode remappings not covered by defaults
(add-to-list 'major-mode-remap-alist '(some-mode . some-ts-mode))

[artelse]

I have the problem that treesit will download and compile the language, but the resultant .so file won't show up in the tree-sitter folder. This is on a compiled 31 version. Any ideas?

[yzhou216]

I have the problem that treesit will download and compile the language, but the resultant .so file won't show up in the tree-sitter folder. This is on a compiled 31 version. Any ideas?

I have the same issue on my Emacs built from masterbranch.