on:
  - push
  - pull_request

name: Code coverage with llvm-cov

jobs:
  Prepare:
    runs-on: ubuntu-latest
    outputs:
      pr_changed_source: ${{ steps.classify_pr.outputs.pr_changed_source }}
    steps:
      - name: Checkout Crate
        uses: actions/checkout@v4
      - name: Determine what files the PR changes.
        id: classify_pr
        run: contrib/classify-pr.sh ${{ github.event.pull_request.head.sha }} ${{ github.event.pull_request.base.sha }}

  Coveralls:
    needs: Prepare
    if: needs.Prepare.outputs.pr_changed_source == 'true'
    name: Code coverage - stable toolchain
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
    steps:
      - name: Checkout Crate
        uses: actions/checkout@v4
      - name: Checkout Toolchain
        # https://github.com/dtolnay/rust-toolchain
        uses: dtolnay/rust-toolchain@stable
      - name: Install cargo-llvm-cov
        uses: taiki-e/install-action@cargo-llvm-cov
      - name: Generate code coverage for tests
        run: cargo llvm-cov --ignore-filename-regex fuzz --all-features --workspace --lcov --output-path lcov.info
      - name: Upload report to coveralls
        uses: coverallsapp/github-action@v2