name: lint

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

jobs:
  lint:
    runs-on: ubuntu-latest

    env:
      LUA_VERSION: 5.1.5
      LUAROCKS_VERSION: 3.11.1

    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 install libreadline-dev libncurses-dev
        wget https://www.lua.org/ftp/lua-${{ env.LUA_VERSION }}.tar.gz -O - | tar -xzf -
        cd lua-${{ env.LUA_VERSION }}
        make linux
        make -j INSTALL_TOP=$GITHUB_WORKSPACE/.lua install
        rm -rf $GITHUB_WORKSPACE/lua-${{ env.LUA_VERSION }}

    - name: Install LuaRocks and Luacheck
      if: steps.luarockscache.outputs.cache-hit != 'true'
      run: |
        wget https://luarocks.org/releases/luarocks-${{ env.LUAROCKS_VERSION }}.tar.gz -O - | tar -xzf -
        cd luarocks-${{ env.LUAROCKS_VERSION }}
        ./configure --with-lua-bin=$GITHUB_WORKSPACE/.lua/bin --prefix=$GITHUB_WORKSPACE/.luarocks
        make build
        make install
        PATH=$PATH:$GITHUB_WORKSPACE/.luarocks/bin
        luarocks install luacheck
        luarocks install lanes
        rm -rf $GITHUB_WORKSPACE/luarocks-${{ env.LUAROCKS_VERSION }}

    - name: Luacheck
      run: .luarocks/bin/luacheck .