nvim_config/lua/config/treesitter.lua

require('nvim-treesitter.configs').setup {
    autotag = {
        enable = true,
    },
    highlight = {
        enable = true,
        -- Setting this to true will run `:h syntax` and tree-sitter at the same time.
        -- Set this to `true` if you depend on 'syntax' being enabled (like for indentation).
        -- Using this option may slow down your editor, and you may see some duplicate highlights.
        -- Instead of true it can also be a list of languages
        additional_vim_regex_highlighting = false,
    },
    incremental_selection = {
        enable = true,
        keymaps = {
            init_selection = "gnn",
            node_incremental = "grn",
            scope_incremental = "grc",
            node_decremental = "grm",
        },
    },
    indent = {
        enable = true
    },
}

local parser_config = require "nvim-treesitter.parsers".get_parser_configs()

parser_config.hare = {
    install_info = {
        -- url = 'https://git.sr.ht/~ecmma/tree-sitter-hare', -- local path or git repo
        url = '/home/leo/.config/nvim/deps/tree-sitter-hare',
        files = { "src/parser.c" },
        -- optional entries:
        -- branch = "main", -- default branch in case of git repo if different from master
        generate_requires_npm = false,          -- if stand-alone parser without npm dependencies
        requires_generate_from_grammar = false, -- if folder contains pre-generated src/parser.c
    },
    filetype = "ha",                            -- if filetype does not match the parser name
}

vim.treesitter.language.register('hare', 'hare')