name: PR labels

on: [pull_request]


jobs:
  pr-label:
    runs-on: ubuntu-latest
    name: PR label
    steps:
    - uses: actions/checkout@v2
      with:
        fetch-depth: 0
    - id: pr_labels
      run: script/pr-labels ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }}
    - uses: octokit/request-action@v2.0.7
      if: ${{ steps.pr_labels.outputs.labels != '[""]' }}
      with:
        route: POST /repos/:repository/issues/:number/labels
        number: ${{ github.event.number }}
        repository: ${{ github.repository }}
        labels: ${{ steps.pr_labels.outputs.labels }}
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}