name: opam CI

on:
  pull_request:
  push:
   branches:
     - master

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    name: Build
    strategy:
      fail-fast: false
      matrix:
        setup:
          - {ocaml-compiler: '4.06.x', os: ubuntu-latest}
          - {ocaml-compiler: '4.10.x', os: ubuntu-latest}
          - {ocaml-compiler: '4.12.x', os: ubuntu-latest}
          - {ocaml-compiler: '4.13.x', os: ubuntu-latest}
          - {ocaml-compiler: '4.14.x', os: ubuntu-latest}
          - {ocaml-compiler: 'ocaml-base-compiler.5.3.0~beta2', os: ubuntu-latest}
          - {ocaml-compiler: '4.06.x', os: macos-13}
          - {ocaml-compiler: 'ocaml-base-compiler.5.3.0~beta2', os: macos-13}
          - {ocaml-compiler: 'ocaml-base-compiler.5.3.0~beta2', os: macos-14}
            # looks like setup-ocaml@v3 can only run actions on windows for
            # OCaml >= 4.13
            # https://github.com/ocaml/setup-ocaml/issues/822#issuecomment-2215525942
          - {ocaml-compiler: '4.14.x', os: windows-latest}

    runs-on: ${{ matrix.setup.os }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Use OCaml ${{ matrix.setup.ocaml-compiler }}
        uses: ocaml/setup-ocaml@v3
        with:
          ocaml-compiler: ${{ matrix.setup.ocaml-compiler }}
          opam-pin: false

      - name: Load opam cache when not Windows
        if: runner.os != 'Windows'
        id: opam-cache
        uses: actions/cache/restore@v4
        with:
          path: ~/.opam
          key: opam-${{ matrix.setup.os }}-${{ matrix.setup.ocaml-compiler }}-${{ hashFiles('*.opam') }}

      - name: Load opam cache when Windows
        if: runner.os == 'Windows'
        id: opam-cache-windows
        uses: actions/cache/restore@v4
        with:
          path: _opam
          key: opam-${{ matrix.setup.os }}-${{ matrix.setup.ocaml-compiler }}-${{ hashFiles('**.opam') }}

      - name: Install dependencies
        run: opam install . --deps-only

      - name: Build reason and rtop
        run: opam exec -- dune build -p reason,rtop

      - name: Test
        run: opam exec -- dune runtest -p reason,rtop

      - name: Save cache when not Windows
        uses: actions/cache/save@v4
        if: steps.opam-cache.outputs.cache-hit != 'true' && runner.os != 'Windows'
        with:
          path: ~/.opam
          key: opam-${{ matrix.setup.os }}-${{ matrix.setup.ocaml-compiler }}-${{ hashFiles('**.opam') }}

      - name: Save cache when Windows
        uses: actions/cache/save@v4
        if: steps.opam-cache-windows.outputs.cache-hit != 'true' && runner.os == 'Windows'
        with:
          path: _opam
          key: opam-${{ matrix.setup.os }}-${{ matrix.setup.ocaml-compiler }}-${{ hashFiles('**.opam') }}

