text: from typing import Tuple
  
  
  def merge_wmi(new_wmis: dict) -> Tuple[set, str]:
      """Helper. Used to update vininfo.dicts.wmi.WMI dictionary
      with entries from another dictionary.
  
      Existing keys are skipped, new keys are added, result is sorted.
  
      Returns a two-items tuple:
          0. set of new keys borrowed from `new_wmis`;
          1. source code string to replace the current `WMI` dictionary with.
  
      :param new_wmis: Mapping from WMI (two or three chars) to manufacturer title.
  
      """
      import inspect
      import re
  
      from .dicts import wmi
  
      wmi_src = re.search('WMI = {([^}]+)}', inspect.getsource(wmi), re.MULTILINE)
  
      assert wmi_src, 'Unable to parse WMI dict body'
  
      wmi_src_dict = {}
  
      for line in wmi_src.group(1).splitlines():
          line = line.strip(', ')
  
          if not line:
              continue
  
          key, _, value = line.partition(':')
          wmi_src_dict[key.strip('\'"')] = value.strip()
  
      wmi_missing = set(new_wmis.keys()).difference(wmi_src_dict.keys())
  
      for key in wmi_missing:
          wmi_src_dict[key] = f"'{new_wmis[key]}'"
  
      wmi_dst = ['WMI = {']
  
      for key, value in sorted(wmi_src_dict.items(), key=lambda item: item[0]):
          wmi_dst.append(f"    '{key}': {value},")
  
      wmi_dst.append('}')
  
      return wmi_missing, '\n'.join(wmi_dst)
  