ci: generate parser map

.github/scripts/echo-nvim-ts-ft-maps.lua

@@ -0,0 +1,29 @@
+#!/usr/bin/env -S nvim -u NONE -U NONE -N -i NONE -l
+
+vim.opt.rtp:append(vim.fs.joinpath(vim.fn.getcwd(), "nvim-treesitter"))
+
+local parser_configs = require("nvim-treesitter.parsers").configs
+for lang, config in pairs(parser_configs) do
+    config.lang = lang
+end
+local parser_map = vim.iter(parser_configs)
+    :filter(function(config)
+        return config.filetype ~= nil
+    end)
+    :fold({}, function(acc, config)
+        acc[config.filetype] = config.lang
+        return acc
+    end)
+
+local mod = ([==[
+---@mod rocks_treesitter.ft_parser_map
+---@brief [[
+---
+---This module is generated. Do not edit by hand!
+---
+---@brief ]]
+
+return %s
+]==]):format(vim.inspect(parser_map))
+
+io.write(mod)

.github/workflows/update-ft-ts-maps.yml

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+
+---
+name: Update filetype -> parser mappings
+
+# Prevent concurrent auto-commits
+concurrency:
+  group: update-filetype-parser-mappings
+  cancel-in-progress: true
+
+on:
+  push:
+    branches:
+      - 'main'
+    paths:
+      - '.github/scripts/echo-nvim-ts-ft-maps.lua'
+      - .github/workflows/update-ft-ts-maps.yml
+  schedule:
+    # Runs at midnight
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+jobs:
+  update-filetype-parser-mappings:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}
+      - uses: actions/checkout@v4
+        with:
+          repository: nvim-treesitter/nvim-treesitter
+          path: nvim-treesitter
+          ref: main
+      - uses: rhysd/action-setup-vim@v1
+        with:
+          neovim: true
+          version: nightly
+      - name: Update tree-sitter parsers JSON
+        run: |
+          ./.github/scripts/echo-nvim-ts-ft-maps.lua > lua/rocks_treesitter/ft_parser_map.lua
+      - name: commit
+        uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "chore: update filetype -> parser map"
+          file_pattern: "lua/rocks_treesitter/ft_parser_map.lua"