auto-label.yaml

name: PR Auto Labeler
on:
  pull_request:
    types: [opened, edited, synchronize]

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - name: Label PR based on title and comments
        uses: actions/github-script@v5
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            const { pull_request: pr, repository: { owner: { login: owner }, name: repo } } = context.payload;
            const title = pr.title;
            const issue_number = pr.number;

            // Define keyword-to-label mapping
            const labelRules = [
              { keyword: 'feat', label: 'feature' },
              { keyword: '[WIP]', label: "don't merge" },
              { keyword: 'refactor', label: 'refactor' },
              { keyword: 'fix', label: 'bug' },
              { keyword: '[RENOVATE-BOT]', label: 'dependency upgrade' },
            ];

            // Collect all labels that should be added according to the title
            const labelsToAdd = labelRules.filter(rule => title.includes(rule.keyword)).map(rule => rule.label);

            // Remove "don't merge" label if the PR title no longer contains "[WIP]"
            const currentLabels = (await github.rest.issues.listLabelsOnIssue({ owner, repo, issue_number })).data.map(label => label.name);
            if (!title.includes('[WIP]') && currentLabels.includes("don't merge")) {
                await github.rest.issues.removeLabel({ owner, repo, issue_number, name: "don't merge" });
            }

            // Add labels to the PR
            await github.rest.issues.addLabels({ owner, repo, issue_number, labels: labelsToAdd });