Add workflow for checking query files

.github/workflows/check_query_files.yml

@@ -0,0 +1,30 @@
+name: Check loading of syntax files
+
+on: [push, pull_request]
+
+jobs:
+  luacheck:
+    name: Check Query Files
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Prepare
+        run: |
+          sudo apt-get update
+          sudo add-apt-repository universe
+          wget https://github.com/neovim/neovim/releases/download/nightly/nvim.appimage
+          chmod u+x nvim.appimage
+          mkdir -p ~/.local/share/nvim/site/pack/nvim-treesitter/start
+          ln -s $(pwd) ~/.local/share/nvim/site/pack/nvim-treesitter/start
+
+      - name: Compile parsers
+        run: ./nvim.appimage --headless -c "TSInstallSync all" -c "q"
+
+      - name: Check query files
+        run: ./nvim.appimage --headless -c "luafile ./scripts/check-queries.lua" -c "q"
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: parsers
+          path: parser/*

scripts/check-queries.lua

@@ -0,0 +1,25 @@
+-- Execute as `nvim --headless -c "luafile ./scripts/check-queries.lua"`
+local function do_check()
+  local parsers = require 'nvim-treesitter.parsers'.available_parsers()
+  local queries = require 'nvim-treesitter.query'
+  local query_types = {'highlights', 'locals'}
+
+  for _, lang in pairs(parsers) do
+    for _, query_type in pairs(query_types) do
+      print('Checking '..lang..' '..query_type)
+      queries.get_query(lang, query_type)
+    end
+  end
+end
+
+
+local ok, err = pcall(do_check)
+if ok then
+  print('Check successful!\n')
+  vim.cmd('q')
+else
+  print('Check failed:')
+  print(err)
+  print('\n')
+  vim.cmd('cq')
+end