luac.yml

name: Lua compiler
on:
  push:
    branches:
      - 'main'
      - '[0-9]+.[0-9]+'
    paths:
      - 'radio/src/thirdparty/Lua/**'
      - '.github/workflows/luac.yml'
  pull_request:
    paths:
      - 'radio/src/thirdparty/Lua/**'
      - '.github/workflows/luac.yml'
  workflow_dispatch:

jobs:
  build:
    name: Build edgetx-luac (${{ matrix.os }})
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
    runs-on: ${{ matrix.os }}
    defaults:
      run:
        shell: bash
    steps:
      - name: Check out the repo
        uses: actions/checkout@v7

      - name: Build
        run: |
          cmake -S radio/src/thirdparty/Lua -B build-luac -DCMAKE_BUILD_TYPE=Release
          cmake --build build-luac --config Release

      - name: Compile a script and check the bytecode header
        run: |
          LUAC=$(find build-luac -type f \( -name edgetx-luac -o -name edgetx-luac.exe \) | head -1)
          cat > ok.lua <<'EOF'
          local t = { 1, 2, 3 }
          return { run = function() return #t + 0.5 end }
          EOF
          "$LUAC" -s -o ok.luac ok.lua

          # signature, version 5.3, format, LUAC_DATA, then sizeof(int),
          # sizeof(size_t) (written as int for the radio), Instruction,
          # lua_Integer and lua_Number must all be 4 bytes
          expected=1b4c7561530019930d0a1a0a0404040404
          actual=$(od -An -tx1 -N17 ok.luac | tr -d ' \n')
          if [ "$actual" != "$expected" ]; then
            echo "::error::Unexpected bytecode header: $actual (expected $expected)"
            exit 1
          fi

          # load the bytecode back through lundump
          "$LUAC" -l -p ok.luac > /dev/null

      - name: Reject a script with a syntax error
        run: |
          LUAC=$(find build-luac -type f \( -name edgetx-luac -o -name edgetx-luac.exe \) | head -1)
          printf 'local x =\n' > bad.lua
          if "$LUAC" -p bad.lua; then
            echo "::error::edgetx-luac accepted a script with a syntax error"
            exit 1
          fi