mutants.yml

name: Find mutants
on:
  schedule:
    - cron: '42 3 * * 2,5' # Runs at 03:42 UTC (m and h chosen arbitrarily) twice a week.
  workflow_dispatch:
  pull_request:
    branches: ["main"]
    paths-ignore: ["*.md", "*.png", "*.svg", "LICENSE-*"]

concurrency:
  group: ${{ github.workflow }}-${{ github.ref_name }}
  cancel-in-progress: true

jobs:
  mutants:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Install dependencies
        env:
          DEBIAN_FRONTEND: noninteractive
        run: |
          sudo apt-get install -y --no-install-recommends gyp mercurial ninja-build lld
          echo "RUSTFLAGS=-C link-arg=-fuse-ld=lld" >> "$GITHUB_ENV"

      - name: Fetch and build NSS and NSPR
        uses: ./.github/actions/nss

      - name: Install Rust
        uses: ./.github/actions/rust
        with:
          version: stable

      - name: Find incremental mutants
        if: github.event_name == 'pull_request'
        run: |
          git diff origin/${{ github.base_ref }}.. > pr.diff
          set -o pipefail
          cargo mutants --test-tool=nextest --no-shuffle -j 2 -vV --in-diff pr.diff | tee results.txt || true
          echo 'TITLE=Incremental Mutants' >> "$GITHUB_ENV"

      - name: Find mutants
        if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
        run: |
          set -o pipefail
          cargo mutants --test-tool=nextest -vV --in-place | tee results.txt || true
          echo 'TITLE=All Mutants' >> "$GITHUB_ENV"

      - name: Post step summary
        if: always()
        run: |
          {
            echo "### $TITLE"
            echo "See https://mutants.rs/using-results.html for more information."
            echo '```'
            sed 's/\x1b\[[0-9;]*[mGKHF]//g' results.txt
            echo '```'
          } > "$GITHUB_STEP_SUMMARY"

      - name: Archive mutants.out
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: mutants.out
          path: mutants.out