clang-format.yml

name: ClangFormat Lint

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

jobs:
  clang-format-check:
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
      with:
        fetch-depth: 0

    - name: Install clang-format
      run: sudo apt-get install -y clang-format

    - name: Get changed files
      id: changed-files
      run: |
        if [ ${{ github.event_name }} == 'pull_request' ]; then
          # For pull requests, compare against the base branch
          echo "FILES=$(git diff --name-only --diff-filter=ACMRT ${{ github.event.pull_request.base.sha }} ${{ github.sha }} | grep -E '\.(cpp|h)$' | xargs)" >> $GITHUB_OUTPUT
        else
          # For pushes, compare against the parent commit
          echo "FILES=$(git diff --name-only --diff-filter=ACMRT ${{ github.event.before }} ${{ github.sha }} | grep -E '\.(cpp|h)$' | xargs)" >> $GITHUB_OUTPUT
        fi

    - name: Run clang-format
      run: |
        for file in ${{ steps.changed-files.outputs.FILES }}; do
          clang-format -style=file -i "$file"
        done
        git diff --exit-code

    - name: Suggest changes if formatting is incorrect
      if: failure()
      run: |
        echo "::error::Formatting issues found. Please run clang-format on your changes and commit the results."
        git diff