format.yml

name: format

on:
  pull_request:
  workflow_dispatch:

jobs:
  clang-format:
    name: clang-format
    runs-on: ubuntu-24.04
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: "3.12"
      - name: Install clang-format (pinned to match .pre-commit-config.yaml)
        run: pip install "clang-format==18.1.8"
      - name: Check formatting (library + examples; excludes vendored stb)
        run: |
          files=$(git ls-files '*.h' '*.hpp' '*.cpp' '*.cu' \
            | grep -vE '(^|/)stb_image(_write)?\.h$')
          echo "$files"
          clang-format --dry-run --Werror $files

  clang-tidy:
    name: clang-tidy (changed files)
    runs-on: ubuntu-24.04
    if: ${{ github.event_name == 'pull_request' }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - uses: ./.github/actions/setup-trt
      - name: Install clang-tidy
        run: sudo apt-get install -y clang-tidy-18
      - name: Configure (export compile_commands.json)
        run: |
          cmake -S . -B build \
            -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
            -DTRT_CPP_API_BUILD_TESTS=ON \
            -DCMAKE_CUDA_COMPILER=/usr/local/cuda-12.6/bin/nvcc
      - name: clang-tidy on changed library sources
        run: |
          base="${{ github.event.pull_request.base.sha }}"
          # Lint changed C++ translation units under src/ (the shipping core). clang-tidy is run
          # on source files, never on headers or .cu: a header has no compile command of its own,
          # so clang-tidy infers flags from the nearest unit -- which for our headers is the CUDA
          # kernel (preproc.cu), making it parse them in CUDA mode and fail to find CUDA toolkit
          # headers. Headers are still checked via HeaderFilterRegex when a linted .cpp includes
          # them. --diff-filter=d drops files the PR deletes.
          changed=$(git diff --name-only --diff-filter=d "$base"...HEAD \
            | grep -E '^src/.*\.(c|cc|cpp)$' \
            | grep -vE '\.cu$' || true)
          if [ -z "$changed" ]; then echo "no library source changes"; exit 0; fi
          echo "$changed"
          clang-tidy-18 -p build $changed