Recently discovered Gleam language, and totally fell in love with it shortly!
Here is how you can setup Gleam in doom-emacs
packages.el
We just need the gleam-ts-mode.el, do not download gleam-mode.el as when it gets compiled it requires tree-sitter which causes problem.
(package! gleam-ts-mode
:recipe (:host github
:repo "gleam-lang/gleam-mode"
:branch "main"
:files ("gleam-ts-*.el")))
config.el
(use-package! gleam-ts-mode
:config
;; setup formatter to be used by `SPC c f`
(after! apheleia
(setf (alist-get 'gleam-ts-mode apheleia-mode-alist) 'gleam)
(setf (alist-get 'gleam apheleia-formatters) '("gleam" "format" "--stdin"))))
(after! treesit
(add-to-list 'auto-mode-alist '("\\.gleam$" . gleam-ts-mode)))
(after! gleam-ts-mode
(unless (treesit-language-available-p 'gleam)
;; compile the treesit grammar file the first time
(gleam-ts-install-grammar)))
hack
If you, like me, use Treesitter grammar files from Nix, the tree-sitter subdirectory within the directory specified by user-emacs-directory is linked to Nix’s read-only filesystem, meaning gleam-ts-install-grammar is unable to install grammar files there.
Here’s how you can adjust treesit-extra-load-path and install the grammar file.
(after! gleam-ts-mode
(setq treesit-extra-load-path (list (expand-file-name "~/.local/tree-sitter/")))
(unless (treesit-language-available-p 'gleam)
;; hack: change `out-dir' when install language-grammar'
(let ((orig-treesit--install-language-grammar-1 (symbol-function 'treesit--install-language-grammar-1)))
(cl-letf (((symbol-function 'treesit--install-language-grammar-1)
(lambda (out-dir lang url)
(funcall orig-treesit--install-language-grammar-1
"~/.local/tree-sitter/" lang url))))
(gleam-ts-install-grammar)))))