name: CI

on: [push, pull_request]

env:
  CI: "ON" # We can detect this in the build system and other vendors implement it
  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: "full" # 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.
    env:
      FC: gfortran
      GCC_V: ${{ matrix.gcc_v }}

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

    - name: Install Haskell
      uses: mstksg/setup-stack@v1

    - name: Install GFortran Linux
      if: contains(matrix.os, 'ubuntu')
      run: |
        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: Build
      run: |
        stack build

    - name: Run tests
      run: |
        stack test