clang-format.yml

name: Check coding style
on: [pull_request]
defaults:
  run:
    shell: bash
jobs:
  check-format:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Try to fetch required commits
        run: |
          set -xe
          echo "base_ref=${{ github.base_ref }}"
          echo "github.event.pull_request.head.sha=${{ github.event.pull_request.head.sha }}"
          # Based on https://stackoverflow.com/questions/54181901/fetching-only-the-range-of-commits-not-present-in-base-branch
          for ((depth = 8; depth <= 65536; depth *= 2)); do
              echo "trying depth $depth ..."
              git fetch "--depth=$depth" origin "${{ github.base_ref }}:${{ github.base_ref }}"
              git fetch "--depth=$depth" origin "+${{ github.event.pull_request.head.sha }}"
              if git merge-base "${{ github.base_ref }}" "${{ github.event.pull_request.head.sha }}"; then
                  echo "found with depth=$depth"
                  break
              fi
          done
      - name: List commits
        run: git log --oneline "${{ github.base_ref }}..${{ github.event.pull_request.head.sha }}"
      - name: Run clang-format
        uses: wolletd/clang-format-checker@v1
        with:
          source-ref: "${{ github.event.pull_request.head.sha }}"
          target-ref: "${{ github.base_ref }}" # required, merge target