check-title-and-labels.yaml

# based on https://stackoverflow.com/a/75036059 and
# https://github.com/astropy/astropy/blob/main/.github/workflows/check_milestone.yml
name: Check PR title and labels

on:
  # So it cannot be skipped.
  pull_request_target:
    types: [opened, edited, synchronize, labeled, unlabeled]

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref }}
  cancel-in-progress: true

jobs:
  check-title:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            if (/^\[?WIP\b/i.test(context.payload.pull_request.title)) {
              core.setFailed("WIP pull requests can't be merged.");
            }

  check-labels:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            const requiredLabels = ['bug', 'enhancement', 'new feature', 'docs', 'infrastructure', 'dead code', 'refactor'];
            let labels = context.payload.pull_request.labels;

            core.info(`Current labels: ${labels.map(l => l.name).join(', ')}`);
            if (labels.filter(l => requiredLabels.includes(l.name)).length === 0) {
              core.setFailed('Please label this pull request with one of: bug, enhancement, new feature, docs or infrastructure.');
            }