pr_management.yml

name: Auto Label PRs, then add assignees and reviewers automatically.

on:
  pull_request:
    types: [opened, edited, synchronize]

jobs:
  add_labels_reviewers_assignees:
    name: Add labels, then reviewers & assignees
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Label PR based on content
        id: label-pr
        uses: actions/github-script@v7
        with:
          script: |
            const labels = {
              'alternative addition template': 'add mod',
              'site changes template': 'enhancement',
              'chore/documentation template': 'documentation'
            };

            const body = context.payload.pull_request.body.toLowerCase();

            const foundLabels = Object.entries(labels)
              .filter(([keyword]) => body.includes(keyword))
              .map(([, label]) => label);

            if (foundLabels.length > 0) {
              await github.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.pull_request.number,
                labels: foundLabels
              });
            }

            return { labels: foundLabels };

      - name: Set Reviewers and Assignees
        if: steps.label-pr.outputs.labels != '[]'
        uses: actions/github-script@v7
        with:
          script: |
            const labelToReviewers = {
              'add mod': ['KTrain5169', 'blryface'],
              'enhancement': ['WorldWidePixel', 'Nitrrine'],
              'documentation': ['blryface', 'KTrain5169', 'WorldWidePixel']
            };

            const labels = JSON.parse('${{ steps.label-pr.outputs.labels }}').labels;
            const reviewers = new Set();

            labels.forEach(label => {
              (labelToReviewers[label] || []).forEach(reviewer => reviewers.add(reviewer));
            });

            if (reviewers.size > 0) {
              await github.pulls.requestReviewers({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: context.payload.pull_request.number,
                reviewers: Array.from(reviewers)
              });
            }

            await github.issues.addAssignees({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              assignees: [context.payload.pull_request.user.login]
            });

      - name: Comment on PRs
        uses: dannyskoog/pull-request-comment@v1
        with:
          message: I've labeled your PR, assigned you and requested reviews from the relevant people automatically. If you think I did it wrong, please comment below so one of our maintainers can double-check. Thanks!