clang-format.yml

# Copyright (c) 2023 Sebastian Pipping <sebastian@pipping.org>
# SPDX-License-Identifier: Apache-2.0

name: Enforce clang-format

# Drop permissions to minimum, for security
permissions:
  contents: read

on:
  pull_request:
  push:
  schedule:
    - cron: '0 2 * * 5'  # Every Friday at 2am
  workflow_dispatch:

jobs:
  clang-format:
    name: Enforce clang-format
    runs-on: ubuntu-22.04
    env:
      CLANG_MAJOR_VERSION: 18
    steps:

    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332  # v4.1.7

    - 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
        clang-format-${CLANG_MAJOR_VERSION} --version
        clang-format-${CLANG_MAJOR_VERSION} -i *.c
        git diff --exit-code  # i.e. reject non-empty diff