name: Haskell CI

on:
    push:
        paths:
        - '*'
        - '.github/workflows/haskell.yml'
        - '!MANUAL.txt'
        - '!/doc/*'
        - '!/tools/*'
        - '!/linux/*'
        - '!/macos/*'
        - '!/windows/*'
        - '!/man/*'
        - '!AUTHORS.md'
        - '!BUGS'
        - '!CONTRIBUTING.md'
        - '!README.md'
        - '!INSTALL.md'
        - '!COPYRIGHT'
        - '!COPYING.md'
        - '!README.template'
        - '!RELEASE_CHECKLIST'
        - '!appveyor.yml'
        - '!changelog'

jobs:
  linux:

    runs-on: ubuntu-latest
    strategy:
      matrix:
        ghcversion:
        - '8.0.2'
        - '8.2.2'
        - '8.4.4'
        - '8.6.5'
        - '8.8.1'
        include:
        - ghcversion: '8.0.2'
          cabalversion: '2.4'
        - ghcversion: '8.2.2'
          cabalversion: '2.4'
        - ghcversion: '8.4.4'
          cabalversion: '2.4'
        - ghcversion: '8.6.5'
          cabalversion: '2.4'
        - ghcversion: '8.8.1'
          cabalversion: '3.0'
    steps:
    - uses: actions/checkout@v1
    - name: Install recent cabal/ghc
      run: |
          sudo add-apt-repository ppa:hvr/ghc
          sudo apt-get update
          sudo apt-get install ghc-${{ matrix.ghcversion }} cabal-install-${{ matrix.cabalversion }}
    - name: Install dependencies
      run: |
          export PATH=/opt/cabal/bin:/opt/ghc/bin:$PATH
          cabal v2-update
          cabal v2-build --dependencies-only --enable-tests
    - name: Build and test
      run: |
          export PATH=/opt/cabal/bin:/opt/ghc/bin:$PATH
          cabal v2-install --enable-tests --run-tests 2>&1 | tee build.log
          # fail if warnings in local build
          ! grep -q "[Ww]arning:" build.log

# ARTIFACTS:  Currently disabled. The executables are large and
# if we do produce artifacts, we should zip them.  We also
# might consider doing this only nightly and stripping.
# The code is included below in case we want to re-enable it.
#
#   - name: Install artifact
#     run: |
#         export PATH=/opt/cabal/bin:/opt/ghc/bin:$PATH
#         mkdir -p ./artifacts
#         for f in $(find dist-newstyle -name 'pandoc*' -type f -executable); do cp $f ./artifacts/; done
#   - uses: actions/upload-artifact@master
#     with:
#       name: pandoc-linux
#       path: ./artifacts/pandoc

  windows:

    runs-on: windows-latest

    steps:
    - uses: actions/checkout@v1
    - name: Install stack
      shell: cmd
      run: |
          choco install haskell-stack
    - name: Install dependencies
      run: |
          stack update
          stack test --dependencies-only
    - name: Build and test
      shell: cmd
      run: |
          stack test

  macos:

    runs-on: macOS-latest

    steps:
    - uses: actions/checkout@v1
    - name: Install stack
      run: |
          curl -L https://get.haskellstack.org/stable/osx-x86_64.tar.gz -o stack.tar.gz
          tar xzvf stack.tar.gz --strip-components=1 'stack*/stack'
    - name: Install dependencies
      run: |
          ./stack update
          ./stack test --dependencies-only
    - name: Build and test
      run: |
          ./stack test