labeler.yml

name: Auto-label PRs

on:
  pull_request_target:
    types: [opened, synchronize, reopened]

permissions:
  contents: read
  pull-requests: write
  issues: write

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/labeler@v6
        with:
          repo-token: "${{ secrets.GITHUB_TOKEN }}"
          configuration-path: .github/labeler.yml
      - name: Label from commit emojis
        uses: actions/github-script@v9
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            // Get all repository labels (with pagination) and build emoji-to-label map
            const repoLabels = await github.paginate(
              github.rest.issues.listLabelsForRepo,
              {
                owner: context.repo.owner,
                repo: context.repo.repo,
                per_page: 100,
              }
            );

            const labelMap = {};
            for (const label of repoLabels) {
              // Extract the emoji from the label name (first character(s))
              const match = label.name.match(/^(\p{Emoji}[\u200d\ufe0f]*)/u);
              if (match) {
                const emoji = match[1];
                labelMap[emoji] = label.name;
              }
            }

            const { data: commits } = await github.rest.pulls.listCommits({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
            });

            const labelsToAdd = new Set();
            for (const commit of commits) {
              const message = commit.commit.message;
              // Check if message starts with an emoji
              for (const [emoji, label] of Object.entries(labelMap)) {
                if (message.startsWith(emoji)) {
                  labelsToAdd.add(label);
                  break;
                }
              }
            }

            if (labelsToAdd.size > 0) {
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                labels: Array.from(labelsToAdd)
              });
            }