.github/workflows/clang-format.yml

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# Copyright (c) 2024      Sebastian Pipping <sebastian@pipping.org>
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name: Enforce clang-format clean code

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

jobs:
  clang_format:
    name: Enforce clang-format clean code
    runs-on: ubuntu-22.04
    steps:
    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1

    - name: Install clang-format 17
      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 https://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-17 main"
        sudo apt-get update  # due to new repository
        sudo apt-get install --yes --no-install-recommends -V \
            clang-format-17 \
            moreutils
        echo /usr/lib/llvm-17/bin >>"${GITHUB_PATH}"

    - name: Run clang-format
      run: |
        set -x
        cd expat/
        ./apply-clang-format.sh
        git config color.diff always
        git diff --exit-code  # i.e. fail CI when there is a diff (and present it)