clang-format.yml

name: Enforce clang-format

on:
  pull_request:
  push:
  schedule:
    - cron: '0 3 * * 5'  # Every Friday at 3am

jobs:
  clang-format:
    name: Enforce clang-format
    runs-on: ubuntu-22.04
    env:
      CLANG_MAJOR_VERSION: 15
    steps:

    - uses: actions/checkout@v3

    - name: Add Clang/LLVM repositories
      run: |-
        set -x
        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"

    - name: Install clang-format
      run: |-
        set -x
        sudo apt-get update
        sudo apt-get install --yes --no-install-recommends -V \
            clang-format-${CLANG_MAJOR_VERSION}

    - name: Enforce clang-format
      run: |-
        set -x -o pipefail
        clang-format-${CLANG_MAJOR_VERSION} --version
        git ls-files \*.{c,cpp,h,hpp} \
          |xargs clang-format-${CLANG_MAJOR_VERSION} --style=file -i
        git diff --exit-code  # i.e. reject non-empty diff