haskell.yml

name: Haskell CI

on:
  push:
    branches:
      - master
  pull_request:

jobs:
  # Broadly copied from https://github.com/haskell/actions/tree/main/setup
  build:

    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        ghc-version: ['9.10', '9.8', '9.6', '9.4', '9.2']
        # Unlikely that we'll succeed on windows and fail on macos,
        # including it is just burning CI time. But windows could have
        # path or IO issues, so worth including
        os: [ubuntu-latest, windows-latest]

    steps:
      - uses: actions/checkout@v4

      - name: Set up Haskell toolchain
        uses: haskell-actions/setup@v2
        id: setup
        with:
          ghc-version: ${{ matrix.ghc-version }}

      - name: Configure the build
        run: |
          cabal build all --dry-run
        # The last step generates dist-newstyle/cache/plan.json for the cache key.

      - name: Restore cached dependencies
        uses: actions/cache/restore@v3
        id: cache
        env:
          key: ${{ runner.os }}-ghc-${{ steps.setup.outputs.ghc-version }}-cabal-${{ steps.setup.outputs.cabal-version }}
        with:
          path: ${{ steps.setup.outputs.cabal-store }}
          key: ${{ env.key }}-plan-${{ hashFiles('**/plan.json') }}
          restore-keys: ${{ env.key }}-

      - name: Install dependencies
        run: cabal build all --only-dependencies

      # Cache dependencies already here, so that we do not have to rebuild them should the subsequent steps fail.
      - name: Save cached dependencies
        uses: actions/cache/save@v3
        # Caches are immutable, trying to save with the same key would error.
        if: ${{ steps.cache.outputs.cache-primary-key != steps.cache.outputs.cache-matched-key }}
        with:
          path: ${{ steps.setup.outputs.cabal-store }}
          key: ${{ steps.cache.outputs.cache-primary-key }}

      - name: Build
        run: cabal build all

      - name: Run tests
        run: cabal test all

  haskell_post_job:
    runs-on: ubuntu-latest
    needs: [ build ]
    steps:
      - run: |
          echo "jobs info: ${{ toJSON(needs) }}"
      - if: contains(needs.*.result, 'failure')
        run: exit 1
      - if: contains(needs.*.result, 'cancelled') && needs.pre_job.outputs.should_skip != 'true'
        run: exit 1