ELisp Tree-sitter

For Emacs 29+, please use the built-in integration instead of this package.

This is an Emacs Lisp binding for tree-sitter, an incremental parsing library. It requires Emacs 25.1 or above, built with dynamic module support.

It aims to be the foundation for a new breed of Emacs packages that understand code structurally. For example:

Faster, fine-grained code highlighting.
More flexible code folding.
Structural editing (like Paredit, or even better) for non-Lisp code.
More informative indexing for imenu.

The author of tree-sitter articulated its merits a lot better in this Strange Loop talk.

Installation

See the installation section in the documentation.

If you want to hack on emacs-tree-sitter itself, see the next section instead.

Setup for Development

Note: On Windows, use Powershell instead of Bash or cmd.exe.

Clone this repo with the --recursive flag.
Add 3 of its directories to load-path: core/, lisp/ and langs/.
Install eask.
Run bin/setup.

If you want to hack on the high-level features (in Lisp) only:

Make changes to the .el files.
Add tests to tree-sitter-tests.el and run them with bin/test.

If you want to build additional (or all) grammars from source, or work on the core dynamic module, see the next 2 sections.

Building grammars from source

Note: If you are only interested in building the grammar binaries, not the dynamic module, check out tree-sitter-langs.

Install NodeJS. It is needed to generate the grammar code from the JavaScript DSL. The recommended tool to manage NodeJS is volta.
Install tree-sitter CLI tool: (Its binary can also be downloaded directly from GitHub.) Note: version 0.20+ cannot be used, as they introduced a breaking change in binary storage location.
```
# For yarn user
yarn global add [email protected]

# For npm user
npm install -g [email protected]
```
Run langs/script/compile. For example:
```
langs/script/compile rust
```

Working on the dynamic module

Install the Rust toolchain.
Build:
```
bin/build
```
Test:
```
bin/test
```
Continuously rebuild and test on change (requires cargo-watch):
```
bin/test watch
```

To test against a different version of Emacs, set the environment variable EMACS (e.g. EMACS=/snap/bin/emacs make test).

Alternatives

Tree-sitter in Emacs's core (the future)
Binding through C instead of Rust: https://github.com/karlotness/tree-sitter.el (dormant)

Contribution

Contributions are welcomed. Please take a look at the issue list for ideas, or create a new issue to describe any idea you have for improvement.

For language-specific issues/features, please check out tree-sitter-langs instead.

Show respect and empathy towards others. Both technical empathy and general empathy are highly valued.

emacs-tree-sitter / elisp-tree-sitter Goto Github PK