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path: root/.github/workflows/labeler.yml
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name: Automatic Labeling

on:
  pull_request_target:
    types: [opened, synchronize, reopened, ready_for_review, converted_to_draft, closed]
  pull_request_review:
    types: [submitted, dismissed]

jobs:
  labeler:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set Labels
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GH_LABELER }}
          script: |
            const { owner, repo, number: pull_number } = context.issue;
            const { data: pullRequest } = await github.rest.pulls.get({ owner, repo, pull_number });
            const labels = pullRequest.labels.map(label => label.name);
            
            let label = '';
            
            if (pullRequest.draft) {
              label = 'wip';
            } else if (pullRequest.mergeable_state === 'dirty') {
              label = 'merge conflicts';
            } else if (pullRequest.merged) {
              label = ''
            } else {
              const { data: reviews } = await github.rest.pulls.listReviews({ owner, repo, pull_number });
              const { data: commits } = await github.rest.pulls.listCommits({ owner, repo, pull_number });
            
              const filteredReviews = reviews.filter(review => review.state === 'CHANGES_REQUESTED' || review.state === 'APPROVED');
              const lastReview = filteredReviews.sort((a, b) => new Date(b.submitted_at) - new Date(a.submitted_at))[0];
              const lastCommit = commits.sort((a, b) => new Date(b.commit.committer.date) - new Date(a.commit.committer.date))[0];
            
              if (!lastReview || new Date(lastReview.submitted_at) < new Date(lastCommit.commit.committer.date)) {
                label = 'reviews needed';
              } else if (lastReview.state === 'CHANGES_REQUESTED') {
                label = 'changes requested';
              } else if (lastReview.state === 'APPROVED') {
                label = 'merge me please';
              }
            }
            
            // if label is not set change the label
            if (!labels.includes(label)) {
              // list of labels to be removed
              const labelsToRemove = ['merge me please', 'reviews needed', 'merge conflicts', 'wip', 'changes requested'];
            
              // remove all label from list
              const { data: currentLabels } = await github.rest.issues.listLabelsOnIssue({ owner, repo, issue_number: pull_number });
              for (const { name } of currentLabels) {
                if (labelsToRemove.includes(name)) {
                  await github.rest.issues.removeLabel({
                    owner,
                    repo,
                    issue_number: pull_number,
                    name
                  });
                }
              }
            
              // add label
              if (label) {
                await github.rest.issues.addLabels({
                  owner,
                  repo,
                  issue_number: pull_number,
                  labels: [label]
                });
              }
            }