tree-sitter-crystal

Crystal grammar for tree-sitter.

This grammar is mostly complete, and can parse the majority of Crystal's own source code without errors.

Setup

Hopefully support for this parser will be upstreamed by editors soon. At the moment, it must be integrated manually.

Neovim

0. Set up the nvim-treesitter plugin.

For nvim-treesitter v0.10 or newer (recommended)

1. Include this lua snippet in your neovim setup:

   vim.api.nvim_create_autocmd("User", {
     pattern = 'TSUpdate',
     callback = function()
       require('nvim-treesitter.parsers').crystal = {
         install_info = {
           url = 'https://github.com/crystal-lang-tools/tree-sitter-crystal',
           -- path = '<ts-crystal-install-path>', -- if you want to use a local version instead
           generate = false,
           generate_from_json = false,
           queries = 'queries/nvim'
         },
       }
     end,
   })
   
   vim.treesitter.language.register("crystal", { "cr" })

2. Restart neovim and run :TSUpdate

To confirm the grammar is functioning, run :checkhealth nvim-treesitter and look for this line:

- crystal             ✓ . ✓ . ✓

For older nvim-treesitter versions (aka the master branch)

1. Check out this repo locally. Its location will be referred to as <ts-crystal-install-path>.

2. In a terminal, navigate to wherever nvim-treesitter is installed (this will depend on your plugin manager). Run:

   mkdir queries/crystal
   cd queries/crystal
   ln -s <ts-crystal-install-path>/queries/nvim/*.scm .

3. Include this lua snippet in your neovim setup:

   local parser_config = require "nvim-treesitter.parsers".get_parser_configs()
   parser_config.crystal = {
     install_info = {
       url = "<ts-crystal-install-path>",
       files = {"src/parser.c", "src/scanner.c"},
       branch = "main",
     },
     filetype = "cr",
   }

4. Restart neovim and run :TSInstall crystal