name: PHP Compatibility

on:
  push:
    branches:
      - master
      # The PHP compatibility testing was introduced in WordPress 5.5.
      - '5.[5-9]'
      - '[6-9].[0-9]'
    tags:
      - '5.[5-9]*'
      - '[6-9].[0-9]*'
  pull_request:

jobs:

  # Runs PHP compatibility testing.
  #
  # Violations are reported inline with annotations.
  #
  # Performs the following steps:
  # - Checks out the repository.
  # - Sets up PHP.
  # - Logs debug information about the runner container.
  # - Installs Composer dependencies (use cache if possible).
  # - Make Composer packages available globally.
  # - Logs PHP_CodeSniffer debug information.
  # - Runs the PHP compatibility tests.
  # - todo: Configure Slack notifications for failing scans.
  php-comatibility:
    name: Check PHP compatibility
    runs-on: ubuntu-latest
    if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Set up PHP
        uses: shivammathur/setup-php@v2
        with:
          php-version: '7.4'
          coverage: none
          tools: composer, cs2pr

      - name: Log debug information
        run: |
          php --version
          composer --version

      - name: Install Composer dependencies
        uses: ramsey/composer-install@v1
        with:
          composer-options: "--no-progress --no-ansi --no-interaction"

      - name: Make Composer packages available globally
        run: echo "${PWD}/vendor/bin" >> $GITHUB_PATH

      - name: Log PHPCS debug information
        run: phpcs -i

      - name: Run PHP compatibility tests
        run: phpcs --standard=phpcompat.xml.dist -q --report=checkstyle | cs2pr