autolabeler.yml

name: Auto Label Pull Requests

on:
  pull_request_target:
    branches: ["main"]
    types: [opened, synchronize, reopened, edited]

jobs:
  autolabeler:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    env:
      CONFIG_PATH: .github/autolabeler-config.json
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install minimatch
        run: npm install minimatch

      - name: Label PR based on config rules
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs').promises;
            const path = require('path');
            const { minimatch } = require('minimatch');

            const configPath = path.resolve(process.env.CONFIG_PATH);
            const fileContent = await fs.readFile(configPath, 'utf-8');
            const autolabelerConfig = JSON.parse(fileContent);
 
            const prNumber = context.payload.pull_request.number;
            const prListFilesResponse = await github.rest.pulls.listFiles({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: prNumber,
            });
            const prFiles = prListFilesResponse.data;

            for (const [label, rules] of Object.entries(autolabelerConfig)) {
              const shouldAddLabel = prFiles.some((prFile) => {
                return rules.some((rule) => {
                  const isFileStatusMatch = rule.fileStatus ? rule.fileStatus === prFile.status : true;
                  const isIncludeGlobMatch = rule.includeGlobs.some((glob) => minimatch(prFile.filename, glob));
                  const isExcludeGlobMatch = rule.excludeGlobs.some((glob) => minimatch(prFile.filename, glob));
                  
                  return isFileStatusMatch && isIncludeGlobMatch && !isExcludeGlobMatch;
                });
              });

              if (shouldAddLabel) {
                console.log(`Adding label ${label} to PR ${prNumber}`);
                await github.rest.issues.addLabels({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: prNumber,
                  labels: [label],
                });
              }
            }