name: CI

on:
  push:
    branches:
    - master
  pull_request: {}

jobs:
  check:
    # Run `cargo check` first to ensure that the pushed code at least compiles.
    runs-on: ubuntu-latest
    strategy:
      matrix:
        rust: [stable, 1.39.0]
    steps:
    - uses: actions/checkout@master
    - uses: actions-rs/toolchain@v1
      with:
        toolchain: ${{ matrix.rust }}
        profile: minimal
    - name: Check
      uses: actions-rs/cargo@v1
      with:
        command: check
        args: --all --all-targets --all-features

  cache-cargo-hack:
    runs-on: ubuntu-latest
    steps:
    - name: Fetch latest release version of cargo-hack
      run: |
        mkdir -p .github/caching
        curl -sL https://api.github.com/repos/taiki-e/cargo-hack/releases/latest | jq -r '.name' > .github/caching/cargo-hack.lock
    - name: Cache cargo-hack/bin
      id: cache-cargo-hack
      uses: actions/cache@v1
      with:
        path: ${{ runner.tool_cache }}/cargo-hack/bin
        key: cargo-hack-bin-${{ hashFiles('.github/caching/cargo-hack.lock') }}
    - name: Install cargo-hack
      if: "steps.cache-cargo-hack.outputs.cache-hit != 'true'"
      uses: actions-rs/cargo@v1
      with:
        command: install
        args: --root ${{ runner.tool_cache }}/cargo-hack --force cargo-hack

  cargo-hack:
    needs: cache-cargo-hack
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - uses: actions-rs/toolchain@v1
      with:
        toolchain: stable
        profile: minimal
    - name: Fetch latest release version of cargo-hack
      run: |
        mkdir -p .github/caching
        curl -sL https://api.github.com/repos/taiki-e/cargo-hack/releases/latest | jq -r '.name' > .github/caching/cargo-hack.lock
    - name: Restore cargo-hack/bin
      uses: actions/cache@v1
      with:
        path: ${{ runner.tool_cache }}/cargo-hack/bin
        key: cargo-hack-bin-${{ hashFiles('.github/caching/cargo-hack.lock') }}
    - run: echo "::add-path::${{ runner.tool_cache }}/cargo-hack/bin"
    # if `cargo-hack` somehow doesn't exist after loading it from the cache,
    # make *sure* it's there.
    - run: cargo hack --help || { cargo install --force cargo-hack; }
    - name: cargo hack check
      working-directory: ${{ matrix.subcrate }}
      run: cargo hack check --each-feature --no-dev-deps --all

  test-versions:
    # Test against the stable, beta, and nightly Rust toolchains on ubuntu-latest.
    needs: check
    runs-on: ubuntu-latest
    strategy:
      matrix:
        rust: [stable, beta, nightly, 1.39.0]
    steps:
    - uses: actions/checkout@master
    - uses: actions-rs/toolchain@v1
      with:
        toolchain: ${{ matrix.rust }}
        profile: minimal
    - name: Run tests
      uses: actions-rs/cargo@v1
      with:
        command: test
        args: --all --all-features

  style:
    # Check style.
    needs: check
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - uses: actions-rs/toolchain@v1
      with:
        toolchain: stable
        components: rustfmt
        profile: minimal
    - name: rustfmt
      uses: actions-rs/cargo@v1
      with:
        command: fmt
        args: --all -- --check
  
  # warnings:
  #   # Check for any warnings. This is informational and thus is allowed to fail.
  #   runs-on: ubuntu-latest
  #   steps:
  #   - uses: actions/checkout@master
  #   - uses: actions-rs/toolchain@v1
  #     with:
  #       toolchain: stable
  #       components: clippy
  #       profile: minimal
  #   - name: Clippy
  #     uses: actions-rs/clippy-check@v1
  #     with:
  #       token: ${{ secrets.GITHUB_TOKEN }}
  #       args: --all --all-targets --all-features -- -D warnings

  deny-check:
    name: cargo-deny check
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - uses: EmbarkStudios/cargo-deny-action@v0