auto-label-pr.yml

# Auto-label PRs based on title, branch, and author association.
# Adds release-drafter compatible labels for changelog generation.
# Also adds auto-approve countdown label for owner/member PRs.
name: Auto-label PR

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

permissions:
  contents: read
  pull-requests: write

jobs:
  auto-label:
    runs-on: ubuntu-latest
    steps:
      - name: Auto-label based on title and branch
        uses: actions/github-script@v9
        with:
          script: |
            const pr = context.payload.pull_request;
            const title = pr.title.toLowerCase();
            const branch = pr.head.ref.toLowerCase();
            const author = pr.user.login;
            const authorAssoc = pr.author_association;
            const isDraft = pr.draft;
            
            const labelsToAdd = [];
            const labelsToRemove = [];
            
            // Get current labels
            const currentLabels = pr.labels.map(l => l.name);
            
            console.log(`PR #${pr.number}: "${pr.title}"`);
            console.log(`  Branch: ${branch}`);
            console.log(`  Author: ${author} (${authorAssoc})`);
            console.log(`  Draft: ${isDraft}`);
            console.log(`  Current labels: ${currentLabels.join(', ') || 'none'}`);
            
            // ═══════════════════════════════════════════════════════════════
            // Release-drafter compatible labels based on title/branch
            // ═══════════════════════════════════════════════════════════════
            
            // Breaking changes
            if (title.includes('breaking') || title.includes('!:') || branch.startsWith('breaking/')) {
              labelsToAdd.push('breaking');
            }
            
            // Major enhancements
            if (title.includes('major') && (title.includes('feat') || title.includes('enhancement'))) {
              labelsToAdd.push('major-enhancement');
            }
            
            // Major bugs
            if (title.includes('major') && (title.includes('fix') || title.includes('bug'))) {
              labelsToAdd.push('major-bug');
            }
            
            // Removed/Deprecated
            if (title.includes('remove') || title.includes('deprecat')) {
              if (title.includes('deprecat')) {
                labelsToAdd.push('deprecated');
              } else {
                labelsToAdd.push('removed');
              }
            }
            
            // Regular features/enhancements
            if ((title.startsWith('feat') || title.includes('feature') || title.includes('enhancement') || 
                 title.startsWith('add ') || title.startsWith('add:') ||
                 branch.startsWith('feature/') || branch.startsWith('feat/')) &&
                !currentLabels.includes('major-enhancement')) {
              labelsToAdd.push('enhancement');
            }
            
            // Bug fixes
            if ((title.startsWith('fix') || title.includes('bugfix') || title.includes('bug fix') ||
                 title.includes('regression') || branch.startsWith('fix/') || branch.startsWith('bugfix/')) &&
                !currentLabels.includes('major-bug')) {
              labelsToAdd.push('bug');
            }
            
            // Documentation
            if (title.startsWith('docs') || title.startsWith('doc:') || 
                branch.startsWith('docs/') || branch.startsWith('doc/')) {
              labelsToAdd.push('documentation');
            }
            
            // Chore/Maintenance
            if (title.startsWith('chore') || title.startsWith('maint') || 
                title.startsWith('ci:') || title.startsWith('build:') ||
                branch.startsWith('chore/') || branch.startsWith('maint/')) {
              labelsToAdd.push('chore');
            }
            
            // Refactoring
            if (title.startsWith('refactor') || title.includes('refactoring') ||
                branch.startsWith('refactor/')) {
              labelsToAdd.push('refactor');
            }
            
            // Tests
            if (title.startsWith('test') || branch.startsWith('test/')) {
              labelsToAdd.push('tests');
            }
            
            // Security
            if (title.includes('security') || title.includes('cve-') || 
                title.includes('vulnerability') || branch.startsWith('security/')) {
              labelsToAdd.push('security');
            }
            
            // ═══════════════════════════════════════════════════════════════
            // Auto-approve countdown for owner/member PRs
            // ═══════════════════════════════════════════════════════════════
            
            const countdownLabel = 'merge-in-3-days-without-review';
            const hasCountdownLabel = currentLabels.some(l => l.startsWith('merge-in-'));
            
            // Add countdown label for trusted authors (non-draft only)
            // OWNER = repo owner, MEMBER = org member, COLLABORATOR = added as collaborator
            const trustedAssociations = ['OWNER', 'MEMBER', 'COLLABORATOR'];
            if (trustedAssociations.includes(authorAssoc) && !isDraft && !hasCountdownLabel) {
              labelsToAdd.push(countdownLabel);
              console.log(`  → Adding auto-approve countdown for ${authorAssoc}`);
            }
            
            // ═══════════════════════════════════════════════════════════════
            // Apply labels
            // ═══════════════════════════════════════════════════════════════
            
            // Filter out labels that already exist
            const newLabels = labelsToAdd.filter(l => !currentLabels.includes(l));
            
            if (newLabels.length > 0) {
              console.log(`  → Adding labels: ${newLabels.join(', ')}`);
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: pr.number,
                labels: newLabels
              });
            } else {
              console.log('  → No new labels to add');
            }