pull_request_review_labeler.yaml

name: "[Pull Request] Review Labeler"

on:
  pull_request_review:
    types: [submitted, edited, dismissed]
  pull_request_target:
    types: [synchronize, reopened]

jobs:
  update-labels:
    runs-on: ubuntu-latest
    steps:
      - name: Add or remove labels based on review state
        uses: actions/github-script@v6
        with:
          script: |
            const prNumber = context.payload.pull_request.number;
            const owner = context.repo.owner;
            const repo = context.repo.repo;
            const { data: currentLabels } = await github.rest.issues.listLabelsOnIssue({
              owner,
              repo,
              issue_number: prNumber
            });

            const hasPendingReview = currentLabels.some(label => label.name === 'pending/review');
            let reviewState = context.payload.review?.state
            // If there is no review object, it might be a different event type
            if (!reviewState) {
              // Fetch the latest review state from the PR
              const reviews = await github.rest.pulls.listReviews({
                owner,
                repo,
                pull_number: prNumber
              });

              // If there are any reviews, get the state of the latest one
              if (reviews.data.length > 0) {
                const latestReview = reviews.data[reviews.data.length - 1];
                reviewState = latestReview.state.toLowerCase();
              }
            }

            // Remove 'pending/review' label if it exists and the review state is not 'pending'
            if (hasPendingReview && reviewState !== 'pending') {
              await github.rest.issues.removeLabel({
                owner,
                repo,
                issue_number: prNumber,
                name: 'pending/review'
              });
            }

            // Add 'approved/review' or 'changes_requested/review' label based on review state
            if (reviewState === 'approved' || reviewState === 'changes_requested') {
              const labelToAdd = reviewState === 'approved' ? 'approved/review' : 'changes_requested/review';
              await github.rest.issues.addLabels({
                owner,
                repo,
                issue_number: prNumber,
                labels: [labelToAdd]
              });
            }

            // Re-add 'pending/review' label if PR is synchronized and no reviews are pending
            if (context.eventName === 'pull_request_target' && !hasPendingReview) {
              await github.rest.issues.addLabels({
                owner,
                repo,
                issue_number: prNumber,
                labels: ['pending/review']
              });
            }