name: PHP Compatibility

on:
  # PHP compatibility testing was introduced in WordPress 5.5.
  push:
    branches:
      - trunk
      - '5.[5-9]'
      - '[6-9].[0-9]'
    tags:
      - '5.[5-9]*'
      - '[6-9].[0-9]*'
  pull_request:
    branches:
      - trunk
      - '5.[5-9]'
      - '[6-9].[0-9]'
    paths:
      # This workflow only scans PHP files.
      - '**.php'
      # These files configure Composer. Changes could affect the outcome.
      - 'composer.*'
      # This file configures PHP compatibility scanning. Changes could affect the outcome.
      - 'phpcompat.xml.dist'
      # Changes to workflow files should always verify all workflows are successful.
      - '.github/workflows/*.yml'
  workflow_dispatch:

# Cancels all previous workflow runs for pull requests that have not completed.
concurrency:
  # The concurrency group contains the workflow name and the branch name for pull requests
  # or the commit hash for any other events.
  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
  cancel-in-progress: true

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.
  # - Configures caching for PHP compatibility scans.
  # - Installs Composer dependencies (use cache if possible).
  # - Make Composer packages available globally.
  # - Logs PHP_CodeSniffer debug information.
  # - Runs the PHP compatibility tests.
  # - Ensures version-controlled files are not modified or deleted.
  php-compatibility:
    name: Check PHP compatibility
    runs-on: ubuntu-latest
    timeout-minutes: 20
    if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 # v2.4.0

      - name: Set up PHP
        uses: shivammathur/setup-php@ac7d3d7f84d81a029c20ab72d60264bdb7535831 # v2.15.0
        with:
          php-version: '7.4'
          coverage: none
          tools: composer, cs2pr

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

      # This date is used to ensure that the PHP compatibility cache is cleared at least once every week.
      # http://man7.org/linux/man-pages/man1/date.1.html
      - name: "Get last Monday's date"
        id: get-date
        run: echo "::set-output name=date::$(/bin/date -u --date='last Mon' "+%F")"

      - name: Cache PHP compatibility scan cache
        uses: actions/cache@c64c572235d810460d0d6876e9c705ad5002b353 # v2.1.6
        with:
          path: .cache/phpcompat.json
          key: ${{ runner.os }}-date-${{ steps.get-date.outputs.date }}-phpcompat-cache-${{ hashFiles('**/composer.json', 'phpcompat.xml.dist') }}

      - name: Install Composer dependencies
        uses: ramsey/composer-install@a7320a0581dcd0432930c48a0e7ced67e6ec17e8 # v1.3.0
        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

      - name: Ensure version-controlled files are not modified or deleted
        run: git diff --exit-code

  slack-notifications:
    name: Slack Notifications
    uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
    needs: [ php-compatibility ]
    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
    with:
      calling_status: ${{ needs.php-compatibility.result == 'success' && 'success' || needs.php-compatibility.result == 'cancelled' && 'cancelled' || 'failure' }}
    secrets:
      SLACK_GHA_SUCCESS_WEBHOOK: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}
      SLACK_GHA_CANCELLED_WEBHOOK: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}
      SLACK_GHA_FIXED_WEBHOOK: ${{ secrets.SLACK_GHA_FIXED_WEBHOOK }}
      SLACK_GHA_FAILURE_WEBHOOK: ${{ secrets.SLACK_GHA_FAILURE_WEBHOOK }}