clang-format.yml

name: clang-format

on:
  pull_request: { branches: ["main"] }

# If someone pushes a new commit to a branch, ensure that only the latest commit
# is built to avoid wasting runner minutes.
concurrency:
  group: ${{ github.workflow }}-pr-${{ github.event.pull_request.number || github.run_id }}
  cancel-in-progress: true


jobs:
  clang-format:
    runs-on: ubuntu-latest
    continue-on-error: true
    env:
      CLANG_FORMAT: "clang-format"
    defaults:
      run:
        # Make sure to fail any "run" step early on so that steps don't silently
        # pass even when errors may have occurred.
        shell: bash -o errexit -o nounset -o pipefail {0}
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with: { fetch-depth: 0 }

      - name: Install clang-format
        run: |
          sudo apt-get update
          sudo apt-get install -y clang-format
          $CLANG_FORMAT --version

      - name: Run format check
        run: |
          base_repo="${{ github.event.pull_request.base.repo.full_name || github.repository }}"
          base_url="https://github.com/${base_repo}.git"

          # Fetch the base branch into a unique namespace
          git fetch --no-tags --prune --depth=1 "${base_url}" \
            "refs/heads/${GITHUB_BASE_REF}:refs/remotes/__base__/${GITHUB_BASE_REF}"

          # Compute merge-base vs the fetched ref
          base_commit="$(git merge-base HEAD "refs/remotes/__base__/${GITHUB_BASE_REF}")"

          ./ci/scripts/format --verbose --dry-run --compare-base "${base_commit}"