on: [push, pull_request]

name: Continuous integration

jobs:
  build:
    name: Test ${{ matrix.job.target }}
    runs-on: ${{ matrix.job.os }}
    strategy:
      fail-fast: false
      matrix:
        job:
          # Operating systems available: https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
          - { target: x86_64-unknown-linux-gnu, os: ubuntu-20.04 }
          # mac-latest (currently mac-14) is an ARM device, so use macos-12 to get Intel.
          # Update annoucement: https://github.blog/changelog/2024-04-01-macos-14-sonoma-is-generally-available-and-the-latest-macos-runner-image/
          - { target: x86_64-apple-darwin, os: macos-12 }
          - { target: x86_64-pc-windows-msvc, os: windows-latest }

          - { target: aarch64-unknown-linux-gnu, os: ubuntu-20.04, use-cross: true }

          # mac-14 is an M1 ARM device.
          - { target: aarch64-apple-darwin, os: macos-14 }

          # musl binaries produced by GitHub actions segfault when run, see
          # https://github.com/Wilfred/difftastic/issues/563
          #
          # musl builds seem to work fine elsewhere, so just verify
          # that compilation works for now.
          - { target: x86_64-unknown-linux-musl, os: ubuntu-20.04, use-cross: true, build-only: true }
    env:
      BUILD_CMD: cargo
      SUBCOMMAND: test

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

    - name: Install Rust toolchain
      uses: dtolnay/rust-toolchain@1.74.1
      with:
        targets: ${{ matrix.job.target }}

    - name: Install cross
      if: matrix.job.use-cross
      uses: taiki-e/install-action@v2
      with:
        tool: cross@0.2.5

    - name: Overwrite build command env variable
      if: matrix.job.use-cross
      shell: bash
      run: echo "BUILD_CMD=cross" >> $GITHUB_ENV

    - name: Overwrite build subcommand env variable
      if: matrix.job.build-only
      shell: bash
      run: echo "SUBCOMMAND=build" >> $GITHUB_ENV

    - name: Test
      shell: bash
      run: $BUILD_CMD $SUBCOMMAND --target ${{ matrix.job.target }}

  test_mime_db:
    name: Test with MIME database
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@1.74.1
      # This runs tests that rely on the MIME database being present.
      - run: cargo test -- --ignored

  test_linux_latest_stable:
    name: Test Linux (latest stable Rust)
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
      - run: cargo +stable test

  regression_test:
    name: Output Regression Test
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@1.74.1
      - name: Generate output for all sample files
        run: ./sample_files/compare_all.sh
      - name: Verify output is unchanged
        run: diff -C2 sample_files/compare.result sample_files/compare.expected

  package:
    name: Check Linux Packaging
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@1.74.1
      - run: cargo package --allow-dirty

  fmt:
    name: Rustfmt
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@1.74.1
      - run: cargo fmt --all -- --check

  actionlint:
    name: Actionlint
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v4
      - uses: raven-actions/actionlint@v2
        with:
          shellcheck: false