check_code_format.yml

name: Check code formatting

on:
  workflow_dispatch:
  pull_request:
    branches:
      - main

env:
  BUILD_TYPE: Debug

jobs:
  format_check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install clang-format
        uses: aminya/setup-cpp@v1
        with:
          clang-format: true

      - name: Check clang-format version
        run: clang-format --version

      - name: Check formatting in repo
        id: fmt
        continue-on-error: ${{ github.event_name == 'workflow_dispatch' }}
        run: |
          echo "Checking formatting in repo"
          rm -f /tmp/clang_format_errors.txt

          if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
            echo "Pull request detected. Running clang-format on changed files only."
            base_sha="${{ github.event.pull_request.base.sha }}"
            head_sha="${{ github.event.pull_request.head.sha }}"
            changed=$(git diff --name-only "$base_sha" "$head_sha" | grep -E '\.(cpp|h|hpp)$' || true)
          else
            echo "Non-PR event. Running clang-format on all files."
            changed=$(find . -type f \( -name '*.cpp' -o -name '*.h' -o -name '*.hpp' \))
          fi

          # Process each file and check formatting
          printf '%s\n' "$changed" | while IFS= read -r f; do
            if [ -n "$f" ]; then
              if ! clang-format -Werror --dry-run --ferror-limit=1 "$f" 2>/dev/null; then
                echo "::warning file=$f::Formatting issues in $f"
                echo "- $f" >> /tmp/clang_format_errors.txt
              fi
            fi
          done

          ERRORS=$(cat /tmp/clang_format_errors.txt 2>/dev/null)
          echo "errors<<EOF" >> $GITHUB_OUTPUT
          echo -e "$ERRORS" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
          echo "DEBUG: Contents of GITHUB_OUTPUT file:" 
          cat "$GITHUB_OUTPUT"

          if [ "$GITHUB_EVENT_NAME" = "workflow_dispatch" ]; then
            exit 0
          else
            if [ -n "$ERRORS" ]; then
              exit 1
            else
              exit 0
            fi
          fi

      - name: Post comment on PR
        if: ${{ github.event_name == 'pull_request' && steps.fmt.outputs.errors != '' }}
        uses: actions/github-script@v6
        with:
          script: |
            const err = `${{ steps.fmt.outputs.errors }}`;
            const msg = `### Code Formatting Issues\nThe following files do not adhere to the clang-format style:\n${err}`;
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: msg
            });