labeler.yml

name: Auto Label PRs

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

permissions:
  contents: read
  pull-requests: write

jobs:
  label:
    name: Label PR
    runs-on: ubuntu-latest
    timeout-minutes: 5

    steps:
      - name: Auto-label based on changed files
        uses: actions/labeler@v5
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          configuration-path: .github/labeler.yml
          sync-labels: false

      - name: Add size label
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const pr = context.payload.pull_request;
            const additions = pr.additions;
            const deletions = pr.deletions;
            const totalChanges = additions + deletions;

            // Calculate size category
            let sizeLabel = '';
            if (totalChanges < 10) {
              sizeLabel = 'size: XS';
            } else if (totalChanges < 50) {
              sizeLabel = 'size: S';
            } else if (totalChanges < 200) {
              sizeLabel = 'size: M';
            } else if (totalChanges < 500) {
              sizeLabel = 'size: L';
            } else if (totalChanges < 1000) {
              sizeLabel = 'size: XL';
            } else {
              sizeLabel = 'size: XXL';
            }

            // Remove old size labels
            const currentLabels = await github.rest.issues.listLabelsOnIssue({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: pr.number
            });

            const sizeLabels = currentLabels.data
              .map(label => label.name)
              .filter(name => name.startsWith('size: '));

            for (const label of sizeLabels) {
              if (label !== sizeLabel) {
                await github.rest.issues.removeLabel({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: pr.number,
                  name: label
                });
              }
            }

            // Add new size label
            if (!sizeLabels.includes(sizeLabel)) {
              await github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: pr.number,
                labels: [sizeLabel]
              });
            }

            console.log(`PR #${pr.number}: +${additions} -${deletions} = ${totalChanges} changes → ${sizeLabel}`);