name: changelog

on:
  pull_request:
    types: [opened, synchronize, labeled, unlabeled, reopened]

jobs:
  build:
    name: Changelog Entry Check

    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Grep CHANGES.md for PR number
        if: contains(github.event.pull_request.labels.*.name, 'skip news') != true
        run: |
          grep -Pz "PR( |\n\s*)#${{ github.event.pull_request.number }}[^0-9]" CHANGES.md || \
          (echo "Please add 'PR #${{ github.event.pull_request.number }}' change line to CHANGES.md" && \
          exit 1)