haskell.yml

name: CI

# Trigger the workflow on push or pull request, but only for the master branch
on:
  push:
    branches:
      - master
  pull_request:
  schedule:
    - cron: '0 8 * * 3'

jobs:
  stack:
    name: ${{ matrix.os }} / ${{ matrix.snapshot }}
    runs-on: ${{ matrix.os }}-latest
    continue-on-error: ${{ matrix.snapshot == 'nightly' }}
    strategy:
      fail-fast: false
      matrix:
        os:
          - ubuntu
          - macOS
          - windows
        snapshot:
          - 'lts-12.11'
          - 'lts-14.18'
          - 'lts-16.12'
          - 'lts-18.28'
          - 'lts-19.33'
          - 'lts-20.26'
          - 'lts-21.25'
          - 'lts-22.18'
          - 'nightly'
        exclude:
          # github actions runs with arm for macos
          #
          # older versions of ghc support arm through llvm and the version that
          # the machine uses is not compatible with ghc.
          #
          # So we exclude those builds
          - snapshot: 'lts-12.11'
            os: macOS
          - snapshot: 'lts-14.18'
            os: macOS
          - snapshot: 'lts-16.12'
            os: macOS
          - snapshot: 'lts-18.28'
            os: macOS
          - snapshot: 'lts-19.33'
            os: macOS

    steps:
    - uses: actions/checkout@main

    - uses: haskell-actions/setup@main
      name: Setup Haskell Stack
      id: setuphaskell
      with:
        enable-stack: true
        stack-no-global: true

    - uses: actions/cache/restore@v4
      name: Cache stack files
      with:
        path: ${{ steps.setuphaskell.outputs.stack-root }}
        key: ${{ runner.os }}-${{ matrix.snapshot }}-stack2

    - name: Setup stack.yaml
      shell: bash
      run: |
        set -x
        mv -vf "stack-ci.yaml" ./stack.yaml || true
        mv -vf "stack-${{ matrix.snapshot }}.yaml" ./stack.yaml || true
        mv -vf "stack-${{ matrix.snapshot }}-${{ matrix.os }}.yaml" ./stack.yaml || true

    - name: Build and test
      shell: bash
      run: |
        set -x
        grep . stack.yaml
        if grep SKIP stack.yaml; then
          echo Skipped because that snapshot is broken
          exit 0
        fi
        stack setup --resolver=${{ matrix.snapshot }}
        echo "stack_root: ${{ steps.setuphaskell.outputs.stack-root }}"
        stack --version
        stack --resolver=${{ matrix.snapshot }} ghc -- --version

        # we first build everything without running the tests (with unlimited parallelism)
        stack build --resolver=${{ matrix.snapshot }} --ghc-options=-Werror --test --bench --no-run-tests

        # once that's done we run the tests in a single threaded fashion to avoid
        # https://github.com/commercialhaskell/stack/issues/5024#issuecomment-845001389
        stack build --resolver=${{ matrix.snapshot }} --ghc-options=-Werror --test --bench -j 1

    - uses: actions/cache/save@v4
      if: always()
      with:
        path: ${{ steps.setuphaskell.outputs.stack-root }}
        key: ${{ runner.os }}-${{ matrix.snapshot }}-stack2