---
name: PR Check
env:
  BRANCH: ${{ github.base_ref || 'devel' }}
on:
  pull_request:
    types: [opened, edited, reopened, synchronize]
jobs:
  pr-check:
    name: Scan PR description for semantic versioning keywords
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    steps:
      - name: Write PR body to a file
        run: |
          cat >> pr.body << __SOME_RANDOM_PR_EOF__
          ${{ github.event.pull_request.body }}
          __SOME_RANDOM_PR_EOF__

      - name: Display the received body for troubleshooting
        run: cat pr.body

      # We want to write these out individually just incase the options were joined on a single line
      - name: Check for each of the lines
        run: |
          grep "Bug, Docs Fix or other nominal change" pr.body > Z
          grep "New or Enhanced Feature" pr.body > Y
          grep "Breaking Change" pr.body > X
          exit 0
        # We exit 0 and set the shell to prevent the returns from the greps from failing this step
        # See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#exit-codes-and-error-action-preference
        shell: bash {0}

      - name: Check for exactly one item
        run: |
          if [ $(cat X Y Z | wc -l) != 1 ] ; then
            echo "The PR body must contain exactly one of [ 'Bug, Docs Fix or other nominal change', 'New or Enhanced Feature', 'Breaking Change' ]"
            echo "We counted $(cat X Y Z | wc -l)"
            echo "See the default PR body for examples"
            exit 255;
          else
            exit 0;
          fi