ci.yml

name: CI # Continuous Integration

on:
  push:
    branches:
      - main
  pull_request:

env:
  CARGO_TERM_COLOR: always

jobs:

  test:
    name: Test Suite
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
      - run: cargo test --all-features --workspace

  rustfmt:
    name: Rustfmt
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt
      - uses: Swatinem/rust-cache@v2
      - name: Check formatting
        run: cargo fmt --all -- --check

  clippy:
    name: Clippy
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@stable
        with:
          components: clippy
      - uses: Swatinem/rust-cache@v2
      - name: Clippy check
        run: cargo clippy --all-targets --all-features --workspace -- -D warnings

  docs:
    name: Docs
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@stable
      - uses: Swatinem/rust-cache@v2
      - name: Check documentation
        env:
          RUSTDOCFLAGS: -D warnings
        run: cargo doc

  coverage:
    name: Code Coverage
    runs-on: ${{ matrix.job.os }}
    strategy:
      fail-fast: true
      matrix:
        job:
          - { os: ubuntu-latest  , features: unix }
          - { os: macos-latest   , features: macos }
          - { os: windows-latest , features: windows }
    steps:
    - uses: actions/checkout@v4
    - name: Initialize workflow variables
      id: vars
      shell: bash
      run: |
        ## VARs setup
        outputs() { step_id="vars"; for var in "$@" ; do echo steps.${step_id}.outputs.${var}="${!var}"; echo "${var}=${!var}" >> $GITHUB_OUTPUT; done; }
        # toolchain
        TOOLCHAIN="nightly" ## default to "nightly" toolchain (required for certain required unstable compiler flags) ## !maint: refactor when stable channel has needed support
        # * specify gnu-type TOOLCHAIN for windows; `grcov` requires gnu-style code coverage data files
        case ${{ matrix.job.os }} in windows-*) TOOLCHAIN="$TOOLCHAIN-x86_64-pc-windows-gnu" ;; esac;
        # * use requested TOOLCHAIN if specified
        if [ -n "${{ matrix.job.toolchain }}" ]; then TOOLCHAIN="${{ matrix.job.toolchain }}" ; fi
        outputs TOOLCHAIN
        # target-specific options
        # * CARGO_FEATURES_OPTION
        CARGO_FEATURES_OPTION='--all -- --check' ;  ## default to '--all-features' for code coverage
        # * CODECOV_FLAGS
        CODECOV_FLAGS=$( echo "${{ matrix.job.os }}" | sed 's/[^[:alnum:]]/_/g' )
        outputs CODECOV_FLAGS

    - name: rust toolchain ~ install
      uses: dtolnay/rust-toolchain@nightly
    - name: Test
      run: cargo test ${{ steps.vars.outputs.CARGO_FEATURES_OPTION }} --no-fail-fast
      env:
        CARGO_INCREMENTAL: "0"
        RUSTC_WRAPPER: ""
        RUSTFLAGS: "-Zprofile -Ccodegen-units=1 -Copt-level=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests -Cpanic=abort"
        RUSTDOCFLAGS: "-Cpanic=abort"
    - name: "`grcov` ~ install"
      id: build_grcov
      shell: bash
      run: |
        git clone https://github.com/mozilla/grcov.git ~/grcov/
        cd ~/grcov
        # Hardcode the version of crossbeam-epoch. See
        # https://github.com/uutils/coreutils/issues/3680
        sed -i -e "s|tempfile =|crossbeam-epoch = \"=0.9.8\"\ntempfile =|" Cargo.toml
        cargo install --path .
        cd -
# Uncomment when the upstream issue
# https://github.com/mozilla/grcov/issues/849 is fixed
#      uses: actions-rs/install@v0.1
#      with:
#        crate: grcov
#        version: latest
#        use-tool-cache: false
    - name: Generate coverage data (via `grcov`)
      id: coverage
      shell: bash
      run: |
        ## Generate coverage data
        COVERAGE_REPORT_DIR="target/debug"
        COVERAGE_REPORT_FILE="${COVERAGE_REPORT_DIR}/lcov.info"
        mkdir -p "${COVERAGE_REPORT_DIR}"
        # display coverage files
        grcov . --output-type files --ignore build.rs --ignore "vendor/*" --ignore "/*" --ignore "[a-zA-Z]:/*" --excl-br-line "^\s*((debug_)?assert(_eq|_ne)?!|#\[derive\()" | sort --unique
        # generate coverage report
        grcov . --output-type lcov --output-path "${COVERAGE_REPORT_FILE}" --branch --ignore build.rs --ignore "vendor/*" --ignore "/*" --ignore "[a-zA-Z]:/*" --excl-br-line "^\s*((debug_)?assert(_eq|_ne)?!|#\[derive\()"
        echo "name=report::${COVERAGE_REPORT_FILE}" >> $GITHUB_OUTPUT
    - name: Upload coverage results (to Codecov.io)
      uses: codecov/codecov-action@v4
      # if: steps.vars.outputs.HAS_CODECOV_TOKEN
      with:
        # token: ${{ secrets.CODECOV_TOKEN }}
        file: ${{ steps.coverage.outputs.report }}
        ## flags: IntegrationTests, UnitTests, ${{ steps.vars.outputs.CODECOV_FLAGS }}
        flags: ${{ steps.vars.outputs.CODECOV_FLAGS }}
        name: codecov-umbrella
        fail_ci_if_error: false