ci.yml

name: CI

# Trigger the workflow on push or pull request, but only for the main branch
on:
  pull_request:
  push:
    branches: ["main"]

jobs:
  generate-matrix:
    name: "Generate matrix from cabal"
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    runs-on: ubuntu-latest
    steps:
      - name: Extract the tested GHC versions
        id: set-matrix
        uses: kleidukos/get-tested@f111f862f481884c26faa691de3c51ae110cc766
        with:
          cabal-file: get-tested.cabal
          ubuntu: true
          version: 0.1.6.0
  tests:
    name: ${{ matrix.ghc }} on ${{ matrix.os }}
    needs: generate-matrix
    runs-on: ${{ matrix.os }}
    strategy:
      matrix: ${{ fromJSON(needs.generate-matrix.outputs.matrix) }}
    steps:
      - name: Checkout base repo
        uses: actions/checkout@v4
      - name: Set up Haskell
        id: setup-haskell
        uses: haskell-actions/setup@v2
        with:
          ghc-version: ${{ matrix.ghc }}
          cabal-version: 'latest'
      - name: Configure
        run: cabal new-configure --enable-tests
      - name: Freeze
        run: cabal freeze
      - name: Cache
        uses: actions/cache@v3.3.2
        with:
          path: ${{ steps.setup-haskell.outputs.cabal-store }}
          key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('cabal.project.freeze') }}
          restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
      - name: Build
        run: cabal new-build
      - name: Test
        run: cabal new-test all
  test-generate-matrix-default:
    name: "Tests whether generating the matrix from cabal works with a default version"
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    runs-on: ubuntu-latest
    steps:
      - name: Extract the tested GHC versions
        id: set-matrix
        uses: turion/get-tested@v0.1.6.0
        with:
          cabal-file: get-tested.cabal
          ubuntu: true