enforce-clang-format-clean.yml

name: Enforce clang-format clean

on:
- pull_request
- push

jobs:
  build_and_test:
    name: Enforce clang-format clean
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v3

      - name: Install clang-format
        run: |-
          clang_major_version=14
          set -x -u -o pipefail
          source /etc/os-release
          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
          sudo add-apt-repository "deb http://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-${clang_major_version} main"
          sudo apt-get update
          sudo apt-get install --yes --no-install-recommends -V clang-format-${clang_major_version}
          echo "/usr/lib/llvm-${clang_major_version}/bin" >> "${GITHUB_PATH}"

      - name: Enforce clang-format clean
        run: |-
          clang_format_args=(
              -i
              -style=file
              -verbose
          )
          set -x -u -o pipefail
          clang-format --version
          git ls-files '*.c' '*.cpp' '*.h' \
              | xargs clang-format "${clang_format_args[@]}"
          git diff --exit-code  # i.e. fail CI on non-empty diff