name: CI

on: [push, pull_request]

env:
  CI: "ON" # We can detect this in the build system and other vendors implement it
  CMAKE_BUILD_PARALLEL_LEVEL: "2" # 2 cores on each GHA VM, enable parallel builds
  CTEST_OUTPUT_ON_FAILURE: "ON" # This way we don't need a flag to ctest
  CTEST_PARALLEL_LEVEL: "2"
  HOMEBREW_NO_ANALYTICS: "ON" # Make Homebrew installation a little quicker
  HOMEBREW_NO_AUTO_UPDATE: "ON"
  HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK: "ON"
  HOMEBREW_NO_GITHUB_API: "ON"
  HOMEBREW_NO_INSTALL_CLEANUP: "ON"
  RUST_BACKTRACE: "1" # Make Rust print full backtrace on error

jobs:
  Build:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
        gcc_v: [9] # Version of GFortran we want to use.
        rust: [stable]
    env:
      FC: gfortran-${{ matrix.gcc_v }}
      GCC_V: ${{ matrix.gcc_v }}

    steps:
    - name: Checkout code
      uses: actions/checkout@v1

    - name: Set up Python 3.x
      uses: actions/setup-python@v1 # Use pip to install latest CMake, & FORD/Jin2For, etc.
      with:
        python-version: 3.x

    - name: Set up common
      run: pip install --upgrade cmake

    - name: Install GFortran Linux
      if: contains(matrix.os, 'ubuntu')
      run: |
        sudo add-apt-repository ppa:ubuntu-toolchain-r/test
        sudo apt-get update
        sudo apt-get install -y gcc-${GCC_V} gfortran-${GCC_V}
        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-${GCC_V} 100 \
        --slave /usr/bin/gfortran gfortran /usr/bin/gfortran-${GCC_V} \
        --slave /usr/bingcov gcov /usr/bin/gcov-${GCC_V}

    - name: Install GFortran macOS
      if: contains(matrix.os, 'macos')
      run: brew install gcc@${GCC_V} || brew upgrade gcc@${GCC_V} || true

    - name: Install Rust
      uses: hecrj/setup-rust-action@v1
      with:
        rust-version: ${{ matrix.rust }}

    - name: Build
      run: |
        cargo test --verbose --no-run

    - name: Run tests (Linux, Windows)
      if: contains(matrix.os, 'ubuntu') || contains(matrix.os, 'windows')
      run: |
        cargo test

    # Workaround for https://github.com/fortran-lang/fpm/issues/16
    - name: Run tests (macOS)
      if: contains(matrix.os, 'macos')
      run: |
        cargo test || cargo test || cargo test