name: Rust CI
on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]
jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        rust: ["1.61.0", stable, beta, nightly]
    steps:
    - uses: actions/checkout@v2
    - uses: dtolnay/rust-toolchain@v1
      with:
        toolchain: ${{ matrix.rust }}
    - name: Cache Cargo Dependencies
      uses: Swatinem/rust-cache@v2
      with:
        cache-on-failure: true
    - name: Install MSRV Cargo.lock
      if: ${{ matrix.rust == '1.61.0' }}
      run: mv Cargo.lock.msrv Cargo.lock
    - name: build
      run: cargo build -v
    - name: test
      if: ${{ matrix.rust != '1.61.0' }}
      run: cargo test -v && cargo doc -v

  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

  verify_msrv:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Install or use cached `cargo-msrv`
        uses: baptiste0928/cargo-install@v1
        with:
          crate: cargo-msrv
      - name: Install MSRV Cargo.lock
        run: mv Cargo.lock.msrv Cargo.lock
      - name: Verify Minimum Rust Version
        run: cargo-msrv verify