stack.yml

name: stack
on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

defaults:
  run:
    shell: bash

jobs:
  stack:
    name: Stack ${{ matrix.ghc }} on ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    timeout-minutes: 60
    strategy:
      fail-fast: false
      matrix:
        include:

        - os: macos-latest
          ghc: 9.8.2
          resolver: nightly-2024-06-22
        - os: macos-latest
          ghc: 8.10.7
          resolver: lts-18.28

        - os: windows-latest
          ghc: 9.8.2
          resolver: nightly-2024-06-22
        - os: windows-latest
          ghc: 8.4.4
          resolver: lts-12.26

        - os: ubuntu-latest
          ghc: 9.8.2
          resolver: nightly-2024-06-22
        - os: ubuntu-latest
          ghc: 9.6.5
          resolver: lts-22.26
        - os: ubuntu-latest
          ghc: 9.4.8
          resolver: lts-21.25
        - os: ubuntu-latest
          ghc: 9.2.8
          resolver: lts-20.26
        - os: ubuntu-latest
          ghc: 9.0.2
          resolver: lts-19.33
        - os: ubuntu-latest
          ghc: 8.10.7
          resolver: lts-18.28
        - os: ubuntu-latest
          ghc: 8.8.4
          resolver: lts-16.31
        - os: ubuntu-latest
          ghc: 8.6.5
          resolver: lts-14.27
        - os: ubuntu-latest
          ghc: 8.4.4
          resolver: lts-12.26

        # Tests need directory-1.3.1.0 which entered LTS for GHC 8.4.
        # - os: ubuntu-latest
        #   ghc: 8.2.2
        #   resolver: lts-11.22
        # - os: ubuntu-latest
        #   ghc: 8.0.2
        #   resolver: lts-9.21

    env:
      stack: 'stack --system-ghc --no-install-ghc'

    steps:

    - uses: actions/checkout@v4

    - name: Install GHC and stack with haskell-actions/setup
      uses: haskell-actions/setup@v2
      id:   setup
      with:
        ghc-version: ${{ matrix.ghc }}
        enable-stack: true
        cabal-update: false

    - name: Create stack.yaml
      run: |
        cat > stack.yaml <<EOF
        resolver: ${{ matrix.resolver }}
        compiler: ghc-${{ matrix.ghc }}
        packages: [.]
        EOF

    # According to https://github.com/commercialhaskell/stack/issues/5754#issuecomment-1696156869
    # not all of ~/.stack should be cached,
    # only the index (pantry) and the dependencies (sqlite3+snapshots).

    ## Pantry
    ########################################################################

    - name: Restore cached stack pantry
      uses: actions/cache/restore@v4
      id:   cache-pantry
      with:
        path: ${{ steps.setup.outputs.stack-root }}/pantry
        key:  ${{ runner.os }}-stack-${{ steps.setup.outputs.stack-version }}-pantry-resolver-${{ matrix.resolver }}
        # No fall-back keys here!

    - name: Stack update
      if:   steps.cache-pantry.outputs.cache-hit != 'true'
      run:  ${{ env.stack }} update

    - name: Cache stack pantry
      if:   steps.cache-pantry.outputs.cache-hit != 'true'
      uses: actions/cache/save@v4
      with:
        path: ${{ steps.setup.outputs.stack-root }}/pantry
        key:  ${{ steps.cache-pantry.outputs.cache-primary-key }}

    ## Dependencies
    ########################################################################

    - name: Stack build plan
      run:  ${{ env.stack }} test --dry-run > '.build-plan.txt'

    - name: Restore cached dependencies
      uses: actions/cache/restore@v4
      id:   cache-deps
      with:
        path: |
          ${{ steps.setup.outputs.stack-root }}/stack.sqlite3
          ${{ steps.setup.outputs.stack-root }}/snapshots
        key: ${{ runner.os }}-stack-${{ steps.setup.outputs.stack-version }}-ghc-${{ steps.setup.outputs.ghc-version }}-resolver-${{ matrix.resolver }}-plan-${{ hashfiles('.build-plan.txt') }}
        restore-keys: |
             ${{ runner.os }}-stack-${{ steps.setup.outputs.stack-version }}-ghc-${{ steps.setup.outputs.ghc-version }}-resolver-${{ matrix.resolver }}-
             ${{ runner.os }}-stack-${{ steps.setup.outputs.stack-version }}-ghc-${{ steps.setup.outputs.ghc-version }}-

    - name: Build dependencies
      if:   steps.cache-deps.outputs.cache-hit != 'true'
      run:  ${{ env.stack }} test --dependencies-only

    - name: Cache dependencies
      if:   steps.cache-deps.outputs.cache-hit != 'true'
      uses: actions/cache/save@v4
      with:
        path: |
          ${{ steps.setup.outputs.stack-root }}/stack.sqlite3
          ${{ steps.setup.outputs.stack-root }}/snapshots
        key:  ${{ steps.cache-deps.outputs.cache-primary-key }}

    ## Build and test STMonadTrans
    ########################################################################

    - name: Build w/ tests
      run: ${{ env.stack }} test --no-run-tests

    - name: Run tests
      run: ${{ env.stack }} test