check-labels.yaml

name: Check labels
on:
  pull_request_target:
    branches: [main]
    types: [labeled,opened,reopened,synchronize]

env:
  GH_TOKEN: ${{ secrets.WORKFLOW__LABEL_TOKEN }}

jobs:
  check-for-upcoming:
    runs-on: ubuntu-latest
    name: Check if the PR is an upcoming change
    steps:
      - name: Fail upcoming changes
        # If the PR contains the label for future changes, fail the workflow
        if: contains(github.event.pull_request.labels.*.name, 'upcoming version')
        run: |
          echo "This PR deals with a future change and so can't be merged yet"
          exit 1

      - name: Pass current changes
        run: echo "This PR is marked as only involving current changes"

  add-markdown-prose-label:
    runs-on: ubuntu-latest
    if: github.event.action == 'opened' || github.event.action == 'reopened'
    steps:
      - name: Get repo
        uses: actions/checkout@v3
        with:
          ref: ${{ github.event.pull_request.head.sha }}
      - name: Verify label exists
        shell: bash
        run: |
          if [[ "${{ vars.LBL_MRKDWNPROSE }}" != $(gh label list --search "${{ vars.LBL_MRKDWNPROSE }}" --json name -q '.[] | .name') ]]; then
            echo "Label ${{ vars.LBL_MRKDWNPROSE }} doesn't exist so I need to create it."
            gh label create "${{ vars.LBL_MRKDWNPROSE }}"
          else
            echo "Label ${{ vars.LBL_MRKDWNPROSE }} already exists so no need to create it."
          fi
      - name: Add prose label
        shell: bash
        run: |
          gh pr edit ${{ github.event.pull_request.number }} --add-label "${{ vars.LBL_MRKDWNPROSE }}"