haskell.yml

name: Haskell CI

on:
  push:
  create:

jobs:
  build:
    runs-on: ${{ matrix.os }}

    strategy:
      fail-fast: false
      matrix:
        # Add more elements to this list to run multiple instances of the build in CI.  Increasing the
        # number instances is a good way to trigger flaky build failures
        n: [1]

        ghc: ["8.10.7"]
        os: [ubuntu-latest, macos-latest, windows-latest]

    env:
      # OpenSSL is installed in a non-standard location in MacOS. See
      # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-latest-Readme.md
      PKG_CONFIG_PATH: ${{ (matrix.os == 'macos-latest' && '/usr/lib/pkgconfig:/usr/local/opt/openssl@1.1/lib/pkgconfig') || (matrix.os == 'ubuntu-latest' && '/usr/lib/pkgconfig:/usr/local/lib/pkgconfig') || '' }}
      
      # FIXME: this is arguably a bug, and pkg-config should return the right values!
      LD_LIBRARY_PATH: ${{ (matrix.os != 'windows-latest' && '/usr/local/lib') || '' }}

    steps:
    - name: "WIN: Install System Dependencies via pacman (msys2)"
      if: runner.os == 'Windows'
      run: |
         # ghcup should be installed on current GHA Windows runners. Let's use ghcup to run
         # pacman, to install the necessary dependencies, ...
         ghcup run -- pacman --noconfirm -S `
            mingw-w64-x86_64-pkg-config `
            mingw-w64-x86_64-openssl `
            base-devel `
            autoconf-wrapper `
            autoconf `
            automake `
            libtool `
            make
  
    # this seems to break something. It _must_ come after the pacman setup
    # above. It appears as if PATHEXT is set _after_ ghcup install ghc/cabal, and
    # as such we'd need pacman.exe instead.
    - name: Setup Haskell
      run: |
        # Use GHCUP to manage ghc/cabal
        ghcup install ghc --set ${{ matrix.ghc }}
        ghcup install cabal --set 3.6.2.0

        ghc --version
        cabal --version

    - name: "WIN: fixup cabal config"
      if: runner.os == 'Windows'
      run: |
        # make sure cabal knows about msys64, and mingw64 tools. Not clear why C:/cabal/config is empty
        # and C:/cabal doesn't even exist.  The ghcup bootstrap file should have create it in the image:
        # See https://github.com/haskell/ghcup-hs/blob/787edc17af4907dbc51c85e25c490edd8d68b80b/scripts/bootstrap/bootstrap-haskell#L591
        # So we'll do it by hand here for now.
        #
        # We'll _not_ add extra-include-dirs, or extra-lib-dirs, and rely on what's shipped with GHC.
        # https://github.com/msys2/MINGW-packages/issues/10837#issuecomment-1047105402
        # https://gitlab.haskell.org/ghc/ghc/-/issues/21111
        # if we _do_ want them, this would be the lines to add below

        $ghcMingwDir = Join-Path -Path $(ghc --print-libdir) `
                                 -ChildPath ../mingw/x86_64-*-mingw32/lib/ `
                                 -Resolve

        cabal user-config -a "extra-prog-path: C:/msys64/mingw64/bin, C:/msys64/usr/bin" `
                          -a "extra-include-dirs: C:/msys64/mingw64/include" `
                          -a ("extra-lib-dirs: {0}, C:/msys64/mingw64/lib" -f $ghcMingwDir) `
                          -f init

    - name: "Setup cabal-store"
      id: cabal-store
      shell: bash
      run: |
        cabal_config_file="$(cabal help user-config | tail -n 1 | xargs)"

        if [[ '${{ runner.os }}' != 'Windows' ]]; then
          echo "cabal-store=$(dirname "$cabal_config_file")/store" | tee -a "$GITHUB_OUTPUT"
        else
          echo "cabal-store=C:\\cabal\\store" | tee -a "$GITHUB_OUTPUT"
        fi

    - name: "Check cabal-store"
      shell: bash
      run: echo '${{ steps.cabal-store.outputs.cabal-store }}'

    - uses: actions/checkout@v2

    - name: "[PowerShell] Add build script path"
      if: runner.os == 'Windows'
      shell: pwsh
      run: Add-Content $env:GITHUB_PATH "$(pwd)/.github/bin"

    - name: "[Bash] Add build script path"
      if: runner.os != 'Windows'
      run: echo "$(pwd)/.github/bin" >> $GITHUB_PATH

    - name: "LINUX: Install build environment (apt-get)"
      if: runner.os == 'Linux'
      run: |
        sudo apt-get update
        sudo apt-get -y install libsystemd0 libsystemd-dev
        sudo apt-get -y remove --purge software-properties-common
        sudo apt-get -y autoremove

    - name: "MAC: Install build environment"
      if: runner.os == 'macOS'
      run: brew install autoconf automake libtool openssl@3

    - name: Cabal update
      run: cabal update

    - name: Configure build
      shell: bash
      run: |
        if [ "${{github.event.inputs.tests}}" == "all" ]; then
          echo "Reconfigure cabal projects to run tests for all dependencies"
          sed -i 's|tests: False|tests: True|g' cabal.project
        fi

        cp ".github/workflows/cabal.project.local.ci" cabal.project.local

        echo "# cabal.project.local"
        cat cabal.project.local

    - name: Record dependencies
      id: record-deps
      run: |
        cabal build all --dry-run
        cat dist-newstyle/cache/plan.json | jq -r '."install-plan"[].id' | sort | uniq > dependencies.txt

    - name: Cache Cabal store
      uses: actions/cache@v2
      with:
        path: ${{ steps.cabal-store.outputs.cabal-store }}
        key: cache-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('dependencies.txt') }}
        restore-keys: |
          cache-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('dependencies.txt') }}
          cache-${{ env.CACHE_VERSION }}-${{ runner.os }}-${{ matrix.ghc }}

    - name: Build
      run: cabal build all --enable-tests

    - name: Run tests
      env:
        TMPDIR: ${{ runner.temp }}
        TMP: ${{ runner.temp }}
        KEEP_WORKSPACE: 1
      run: |
        # The tests call out to msys2 commands. We generally do not want to mix toolchains, so
        # we are very deliberate about only adding msys64 to the path where absolutely necessary.
        ${{ (runner.os == 'Windows' && '$env:PATH=("C:\msys64\mingw64\bin;{0}" -f $env:PATH)') || '' }}
        cabal test all --enable-tests