name: CI

on:
  push:
    branches: [ main, master ]
  pull_request:
    branches: [ main, master ]

jobs:
  build:
    name: Build & test (${{ matrix.os }})
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ ubuntu-latest, macOS-latest, windows-latest ]
    steps:
      - uses: actions/checkout@v4

      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable

      - name: Build
        run: cargo build --verbose

      - name: Run tests
        run: cargo test --verbose

  coverage:
    name: Code coverage (${{ matrix.os }})
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ ubuntu-latest, macOS-latest, windows-latest ]
    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}" >> $GITHUB_OUTPUT; done; }
          # CODECOV_FLAGS
          CODECOV_FLAGS=$( echo "${{ matrix.os }}" | sed 's/[^[:alnum:]]/_/g' )
          outputs CODECOV_FLAGS

      - name: Install Rust (nightly)
        uses: dtolnay/rust-toolchain@nightly
      - run: rustup component add llvm-tools-preview

      - name: Test
        run: cargo test --no-fail-fast
        env:
          CARGO_INCREMENTAL: "0"
          RUSTC_WRAPPER: ""
          RUSTFLAGS: "-Cinstrument-coverage -Zcoverage-options=branch -Ccodegen-units=1 -Copt-level=0 -Coverflow-checks=off -Zpanic_abort_tests -Cpanic=abort"
          RUSTDOCFLAGS: "-Cpanic=abort"
          LLVM_PROFILE_FILE: "${{ github.workspace }}/grep-%p-%m.profraw"

      - name: Install grcov
        shell: bash
        run: |
          git clone https://github.com/mozilla/grcov.git ~/grcov/
          cd ~/grcov
          cargo install --path .

      - name: Generate coverage data (via grcov)
        id: coverage
        shell: bash
        run: |
          set -v
          ## 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 --binary-path "${COVERAGE_REPORT_DIR}" --source-dir . --keep-only "src/*" | sort --unique
          # generate coverage report
          grcov . --output-type lcov --output-path "${COVERAGE_REPORT_FILE}" --binary-path "${COVERAGE_REPORT_DIR}" --source-dir . --keep-only "src/*" --branch
          echo "report=${COVERAGE_REPORT_FILE}" >> $GITHUB_OUTPUT

      - name: Upload coverage results (to Codecov.io)
        uses: codecov/codecov-action@v4
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          files: ${{ steps.coverage.outputs.report }}
          flags: ${{ steps.vars.outputs.CODECOV_FLAGS }}
          name: codecov-umbrella
          fail_ci_if_error: false