issue_label_bot.yaml

name: Issue Label Bot

on:
  issues:
    types: [opened, edited]

permissions:
  issues: write
  contents: read

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - name: Apply labels based on keywords
        env:
          GITHUB_TOKEN: ${{ secrets.GH_PAT }}
          ISSUE_NUMBER: ${{ github.event.issue.number }}
          ISSUE_TITLE: ${{ github.event.issue.title }}
          ISSUE_BODY: ${{ github.event.issue.body }}
          GH_REPOSITORY: ${{ github.repository }}
        run: |
          python3 << 'EOF'
          import os, sys, yaml, json
          from urllib.request import Request, urlopen
          from urllib.error import HTTPError

          token = os.environ['GITHUB_TOKEN']
          issue_number = os.environ['ISSUE_NUMBER']
          repo = os.environ['GH_REPOSITORY']
          title = (os.environ.get('ISSUE_TITLE') or '').lower()
          body = (os.environ.get('ISSUE_BODY') or '').lower()
          text = title + ' ' + body

          config_path = '.github/issue_label_bot.yaml'
          try:
              with open(config_path) as f:
                  config = yaml.safe_load(f)
          except FileNotFoundError:
              print(f'Error: config file not found at {config_path}', file=sys.stderr)
              sys.exit(1)
          except yaml.YAMLError as e:
              print(f'Error: failed to parse {config_path}: {e}', file=sys.stderr)
              sys.exit(1)

          labels_to_add = []
          for matcher in config['matchers']:
              if any(kw.lower() in text for kw in matcher['keywords']):
                  labels_to_add.append(matcher['label'])

          if labels_to_add:
              url = f'https://api.github.com/repos/{repo}/issues/{issue_number}/labels'
              data = json.dumps({'labels': labels_to_add}).encode()
              req = Request(url, data=data, headers={
                  'Authorization': f'Bearer {token}',
                  'Content-Type': 'application/json',
                  'Accept': 'application/vnd.github+json',
                  'X-GitHub-Api-Version': '2022-11-28'
              })
              try:
                  with urlopen(req) as resp:
                      print(f'Added labels: {labels_to_add}')
              except HTTPError as e:
                  print(f'Error: GitHub API returned {e.code}: {e.read().decode()}', file=sys.stderr)
                  sys.exit(1)
          else:
              print('No matching labels found.')
          EOF