check.yaml

name: Check

on:
  workflow_dispatch:
  pull_request:
  push:
    branches:
      - main
jobs:
  lint:
    runs-on: macos-latest

    # From actions/cache documentation linked to below
    env:
      MINT_PATH: .mint/lib
      MINT_LINK_PATH: .mint/bin

    steps:
      - uses: actions/checkout@v4

      # We use caching for Mint because at the time of writing SwiftLint took about 5 minutes to build in CI, which is unacceptably slow.
      # https://github.com/actions/cache/blob/40c3b67b2955d93d83b27ed164edd0756bc24049/examples.md#swift---mint
      - uses: actions/cache@v4
        with:
          path: .mint
          key: ${{ runner.os }}-mint-${{ hashFiles('**/Mintfile') }}
          restore-keys: |
            ${{ runner.os }}-mint-

      - run: npm ci
      - run: brew install mint
      - run: mint bootstrap

      - run: swift run BuildTool lint

  generate-matrices:
    runs-on: macos-latest
    outputs:
      matrix: ${{ steps.generation-step.outputs.matrix }}
    steps:
      - uses: actions/checkout@v4
      - id: generation-step
        run: swift run BuildTool generate-matrices >> $GITHUB_OUTPUT

  check-spm:
    name: SPM (Xcode ${{ matrix.tooling.xcodeVersion }}, Swift ${{ matrix.tooling.swiftVersion }})
    runs-on: macos-latest
    needs: generate-matrices
    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.generate-matrices.outputs.matrix).withoutPlatform }}

    steps:
      - uses: actions/checkout@v4
      - uses: maxim-lobanov/setup-xcode@v1
        with:
          xcode-version: ${{ matrix.tooling.xcodeVersion }}

      # https://forums.swift.org/t/warnings-as-errors-for-libraries-frameworks/58393/2
      - run: swift build -Xswiftc -warnings-as-errors -Xswiftc -swift-version -Xswiftc ${{ matrix.tooling.swiftVersion }}
      - run: swift test -Xswiftc -warnings-as-errors -Xswiftc -swift-version -Xswiftc ${{ matrix.tooling.swiftVersion }}

  check-xcode:
    name: Xcode, ${{matrix.platform}} (Xcode ${{ matrix.tooling.xcodeVersion }}, Swift ${{ matrix.tooling.swiftVersion }})
    runs-on: macos-latest
    needs: generate-matrices

    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.generate-matrices.outputs.matrix).withPlatform }}

    steps:
      - uses: actions/checkout@v4
      - uses: maxim-lobanov/setup-xcode@v1
        with:
          xcode-version: ${{ matrix.tooling.xcodeVersion }}

      - name: Build and run tests
        run: swift run BuildTool build-and-test-library --platform ${{ matrix.platform }} --swift-version ${{ matrix.tooling.swiftVersion }}

  check-example-app:
    name: Example app, ${{matrix.platform}} (Xcode ${{ matrix.tooling.xcodeVersion }}, Swift ${{ matrix.tooling.swiftVersion }})
    runs-on: macos-latest
    needs: generate-matrices

    strategy:
      fail-fast: false
      matrix: ${{ fromJson(needs.generate-matrices.outputs.matrix).withPlatform }}

    steps:
      - uses: actions/checkout@v4
      - uses: maxim-lobanov/setup-xcode@v1
        with:
          xcode-version: ${{ matrix.tooling.xcodeVersion }}

      - name: Build example app
        run: swift run BuildTool build-example-app --platform ${{ matrix.platform }} --swift-version ${{ matrix.tooling.swiftVersion }}

  # We use this job as a marker that all of the required checks have completed.
  # This allows us to configure a single required status check in our branch
  # protection rules instead of having to type loads of different check names
  # into the branch protection web UI (and keep this list up to date as we
  # tweak the matrices).
  all-checks-completed:
    runs-on: ubuntu-latest
    needs:
      - lint
      - check-spm
      - check-xcode
      - check-example-app

    steps:
      - name: No-op
        run: "true"