By now Emacs users are well aware of Tree-sitter1 and the built-in
integration that comes with Emacs 29.2 I am a bit late to the party because
only recently I have started to look into
treesit-install-language-grammar, but right now I am more interested in how
Clojure programming can benefit from Tree-sitter.
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.
(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))
clojure-ts-mode is still under development. For instance, Danny is
working on allowing users to pick their preferred indentation style.5 As
Daw-Ran Liou suggested, for now I can use
clojure-mode-variables to make
clojure-ts-mode follow my preferred formatting settings.6
(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.