name: Rust CI
on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        rust: ["1.74.0", stable, beta, nightly]
    steps:
    - uses: actions/checkout@v2

    - uses: dtolnay/rust-toolchain@nightly
      if: ${{ matrix.rust == '1.74.0' }}
    - name: Generate Cargo.lock with minimal-version dependencies
      if: ${{ matrix.rust == '1.74.0' }}
      run: cargo -Zminimal-versions generate-lockfile

    - uses: dtolnay/rust-toolchain@v1
      with:
        toolchain: ${{ matrix.rust }}
    - name: Cache Cargo Dependencies
      uses: Swatinem/rust-cache@v2
      with:
        cache-on-failure: true
    - name: build
      run: cargo build -v
    - name: test
      if: ${{ matrix.rust != '1.74.0' }}
      run: cargo test -v && cargo doc -v

  features:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        feature: ["", deflate, jpeg, lzw, zstd, default, "default,zstd"]
    steps:
    - uses: actions/checkout@v2
    - uses: dtolnay/rust-toolchain@stable
      with:
        components: clippy
    - name: Cargo check
      run: cargo check --features "${{ matrix.feature }}" --no-default-features

  other_archs:
    # github actions does not support 32-bit or big endian systems directly, but
    # it does support QEMU. so we install qemu, then build and run the tests on
    # emulated systems. NOTE: you can also use this approach to test locally.
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        arch: [powerpc-unknown-linux-gnu, i686-unknown-linux-gnu]
    steps:
      - uses: actions/checkout@v4
      - name: Install or use cached cross-rs/cross
        uses: baptiste0928/cargo-install@v2
        with:
          crate: cross
      - name: Cache Cargo Dependencies
        uses: Swatinem/rust-cache@v2
        with:
          cache-on-failure: true
          key: ${{ matrix.arch }}
      - name: Start Docker (required for cross-rs)
        run: sudo systemctl start docker
      - name: Cross-Run Tests using QEMU
        run: cross test --target ${{ matrix.arch }}

  rustfmt:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: dtolnay/rust-toolchain@stable
      with:
        components: rustfmt
    - name: Run rustfmt check
      run: cargo fmt -- --check

  clippy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: dtolnay/rust-toolchain@stable
      with:
        components: clippy
    - run: cargo clippy --all-features # TODO: enable "-- -D warnings" once all outstanding clippy lints are fixed