format.yml

name: Format

on:
  workflow_call:

jobs:
  clang-format:
    name: clang-format check
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          submodules: false
          fetch-depth: 0

      - name: Install clang-format-18
        run: |
          sudo apt-get update
          sudo apt-get install -y clang-format-18

      - name: Determine changed C++ files
        id: changed
        run: |
          set -euo pipefail
          BASE_REF=""
          if [[ -n "${{ github.base_ref }}" ]] && git rev-parse --verify "origin/${{ github.base_ref }}" >/dev/null 2>&1; then
            BASE_REF="origin/${{ github.base_ref }}"
          elif [[ -n "${{ github.event.pull_request.base.sha }}" ]] && git rev-parse --verify "${{ github.event.pull_request.base.sha }}" >/dev/null 2>&1; then
            BASE_REF="${{ github.event.pull_request.base.sha }}"
          else
            BASE_REF="HEAD~1"
          fi

          if git rev-parse --verify "$BASE_REF" >/dev/null 2>&1; then
            FILES=$(git diff --name-only --diff-filter=ACMR "$BASE_REF"...HEAD -- '*.cpp' '*.h' '*.hpp' '*.cc' '*.cxx' '*.inl' '*.c' | grep -v -E '^(thirdparty/|engine/scripting/generated/|build/)' || true)
          else
            FILES=$(git diff --name-only --diff-filter=ACMR HEAD~1 -- '*.cpp' '*.h' '*.hpp' '*.cc' '*.cxx' '*.inl' '*.c' | grep -v -E '^(thirdparty/|engine/scripting/generated/|build/)' || true)
          fi
          echo "files<<EOF" >> "$GITHUB_OUTPUT"
          echo "$FILES" >> "$GITHUB_OUTPUT"
          echo "EOF" >> "$GITHUB_OUTPUT"

      - name: Run clang-format --dry-run
        if: steps.changed.outputs.files != ''
        run: |
          set -euo pipefail
          echo "${{ steps.changed.outputs.files }}" | xargs -r clang-format-18 --dry-run --Werror -style=file

      - name: No changed C++ files
        if: steps.changed.outputs.files == ''
        run: echo "No C++ files changed — skipping format check."