name: lint

on:
  push:
    paths:
      - '.github/workflows/**.yml'
      - '**.lua'

jobs:
  lint:
    runs-on: ubuntu-latest

    env:
      LUA_VERSION: 5.1.5
      LUAROCKS_VERSION: 3.9.2

    steps:
    - name: Checkout
      uses: actions/checkout@v4

    - name: Cache Lua
      uses: actions/cache@v3
      id: luacache
      with:
        path: ~/.lua
        key: ${{ runner.os }}-lua-${{ env.LUA_VERSION }}
        restore-keys: |
          ${{ runner.os }}-lua-${{ env.LUA_VERSION }}

    - name: Cache LuaRocks
      uses: actions/cache@v3
      id: luarockscache
      with:
        path: ~/.luarocks
        key: ${{ runner.os }}-luarocks-${{ env.LUAROCKS_VERSION }}
        restore-keys: |
          ${{ runner.os }}-luarocks-${{ env.LUAROCKS_VERSION }}

    - name: Install Lua
      if: steps.luacache.outputs.cache-hit != 'true'
      run: |
        sudo apt-get update
        sudo apt-get install -y lua5.1 liblua5.1-0-dev
        mkdir -p ~/.lua/bin
        ln -s /usr/bin/lua5.1 ~/.lua/bin/lua

    - name: Install LuaRocks and Luacheck
      if: steps.luarockscache.outputs.cache-hit != 'true'
      run: |
        wget https://luarocks.org/releases/luarocks-${{ env.LUAROCKS_VERSION }}.tar.gz
        tar -xzf luarocks-${{ env.LUAROCKS_VERSION }}.tar.gz
        cd luarocks-${{ env.LUAROCKS_VERSION }}
        ./configure --prefix=$HOME/.luarocks --with-lua-include=/usr/include/lua5.1
        make
        make install
        echo "export PATH=\$HOME/.luarocks/bin:\$PATH" >> ~/.bashrc
        source ~/.bashrc
        luarocks install luacheck

    - name: Run Luacheck
      run: ~/.luarocks/bin/luacheck . -q