check-changelog.yml

name: changelog

on: [label, pull_request]

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/github-script@0.9.0
      with:
        script: |
          const labels = await github.issues.listLabelsOnIssue({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.payload.pull_request.number,
          });
          for (const label of labels.data) {
            if (label.name === 'no-changelog-required') {
              return;
            }
          }
          const files = await github.pulls.listFiles({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: context.payload.pull_request.number,
          });
          let changeLogPresent = false;
          for (const file of files.data) {
            if (file.filename === 'CHANGELOG.md') {
              changeLogPresent = true;
              break;
            }
          }
          if (!changeLogPresent) {
            core.setFailed('changelog is required');
          }