By now Emacs users are well aware of
Tree-sitter and the built-in
integration that comes with Emacs
29. I am
a bit late to the party because only recently I have started to look into
treesit-language-source-alist and treesit-install-language-grammar, but
right now I am more interested in how Clojure programming can benefit from
Tree-sitter.
Danny Freeman is the maintainer of
clojure-ts-mode, and after I
kindly nudged
him
he made it available on NonGNU ELPA. This means that the package is only a M-x package-install away.
Once installed Emacs has to know how to prefer clojure-ts-mode to good old
clojure-mode. This is where majore-mode-remap-alist comes into play.
(push '(clojure-mode . clojure-ts-mode) major-mode-remap-alist)
(push '(clojurec-mode . clojurec-ts-mode) major-mode-remap-alist)
(push '(clojurescript-mode . clojurescript-ts-mode) major-mode-remap-alist)
Since I always use CIDER let’s leverage clojure-ts-mode-hook to enable it.
(add-hook 'clojure-ts-mode-hook #'cider-mode)
This is enough to activate clojure-ts-mode, but upon entering a project I
noticed the lack of a couple of useful key bindings.
(with-eval-after-load 'clojure-ts-mode
(keymap-set clojure-ts-mode-map "C-c C-r" 'clojure-refactor-map)
(keymap-set clojure-ts-mode-map "C-c C-x" 'cider-start-map))
Note that clojure-ts-mode is still under development. For instance, Danny is
working on allowing users to pick their preferred indentation
style. As Daw-Ran
Liou suggested, for now I can use clojure-mode-variables to make
clojure-ts-mode follow my preferred formatting settings.
(add-hook 'clojure-ts-mode-hook #'clojure-mode-variables)
I have been using clojure-ts-mode daily in the last two weeks and the
experience has been great. They say Tree-sitter is a game changer. I say thank
you, Danny Freeman.