Emacs 29 brings treesit, elgot and something interesting. This repo is an attempt to add treesit support for rescript-mode. Due to the existance of rescript-mode, I name this repo rescript2-mode.
- https://github.com/jjlee/rescript-mode
- https://github.com/reasonml-editor/reason-mode
- Rescript emacs support with rescript-vscode
Tree-sitter related:
- https://github.com/nkrkv/tree-sitter-rescript
- https://github.com/lambdadog/rescript-tree-sitter-mode
Prereuquest treesit knowledge
- Using Parsers
- Parsing Program Source – Elisp maunal
- Tree-sitter starter guide
- RFC: Emacs tree-sitter integration
Prerequest elisp knowledge
Emacs 29 has 20 buil-in tree-sitter major modes for C, C++, C#, Java, … from which we can learn some basic usage. Just use M-x apropos -ts-mode$ to view them.
To use rescript’s treesit parser in Emacs, we need:
- libtree-sitter.dll or libtree-sitter.so (from tree-sitter)
- treesit.c and treesit.h (emacs build-in)
- treesit.el (emacs build-in, user api)
- libtree-sitter-rescript (third-party package)
If any of them broke, then treesit-rescript cannot work properly in Emacs. Maybe the first three is robust enough. The code below causes Emacs fall into infinite loop and connot recover by C-g:
(treesit-parse-string "//" 'rescript)If I want to make a robust rescript treesit mode, maybe I need to improve tree-sitter-rescript.