code-formatting-check.yml

name: Code Formatting Check

on:
  pull_request:
    paths:
      - ".github/workflows/code-formatting-check.yml"
      - ".clang-format"
      - "examples_formatter.sh"
      - "examples/**"
  push:
    paths:
      - ".github/workflows/code-formatting-check.yml"
      - ".clang-format"
      - "examples_formatter.sh"
      - "examples/**"

jobs:
  check-formatting:
    runs-on: ubuntu-latest

    env:
      # See: https://github.com/arduino/arduino-ide/blob/main/arduino-ide-extension/package.json
      CLANG_FORMAT_VERSION: 14.0.0

    steps:
      - name: Set environment variables
        run: |
          # See: https://docs.github.com/actions/using-workflows/workflow-commands-for-github-actions#setting-an-environment-variable
          echo "CLANG_FORMAT_INSTALL_PATH=${{ runner.temp }}/clang-format" >> "$GITHUB_ENV"

      - name: Checkout
        uses: actions/checkout@v4

      - name: Download ClangFormat
        id: download
        uses: MrOctopus/download-asset-action@1.0
        with:
          repository: arduino/clang-static-binaries
          tag: ${{ env.CLANG_FORMAT_VERSION }}
          asset: clang-format_${{ env.CLANG_FORMAT_VERSION }}_Linux_64bit.tar.bz2
          target: ${{ env.CLANG_FORMAT_INSTALL_PATH }}

      - name: Install ClangFormat
        run: |
          cd "${{ env.CLANG_FORMAT_INSTALL_PATH }}"
          tar --extract --file="${{ steps.download.outputs.name }}"
          # Add installation to PATH:
          # See: https://docs.github.com/actions/using-workflows/workflow-commands-for-github-actions#adding-a-system-path
          echo "${{ env.CLANG_FORMAT_INSTALL_PATH }}/clang_Linux_64bit" >> "$GITHUB_PATH"

      - name: Format examples
        run: ./examples_formatter.sh

      - name: Check formatting
        run: |
          if ! git diff --color --exit-code; then
            echo "Please do an Auto Format on the sketches:"
            echo "Arduino IDE: Tools > Auto Format"
            echo "Arduino Web Editor: Ctrl + B"
            exit 1
          fi