---
name: Do Not Merge

# action to block merging on specific labels
on:
  pull_request:
    types: [synchronize, opened, reopened, labeled, unlabeled]

permissions: {}

jobs:
  do-not-merge:
    name: Prevent Merging
    runs-on: ubuntu-latest
    env:
      has_tag: >-
         ${{contains(github.event.pull_request.labels.*.name, 'status: needs comment/discussion') ||
            contains(github.event.pull_request.labels.*.name, 'status: waiting for other PR')     ||
            contains(github.event.pull_request.labels.*.name, 'DO NOT MERGE') }}
    steps:
      - name: Check for label
        if: ${{'true' == env.has_tag}}
        run: |
          echo "This PR cannot be merged because it has one of the following labels: "
          echo "* status: needs comment/discussion"
          echo "* status: waiting for other PR"
          echo "* DO NOT MERGE"
          exit 1
      - name: Allow merging
        if: ${{'false' == env.has_tag}}
        run: exit 0