code: def to_hg_scheme_url(cls, url):
          
          regexes = cls._get_url_scheme_regexes()
          for scheme_key, pattern, regex in regexes:
              match = regex.match(url)
              if match is not None:
                  groups = match.groups()
                  if len(groups) == 2:
                      return u''.join(
                          scheme_key,
                          '://',
                          pattern.replace('{1}', groups[0]),
                          groups[1])
                  elif len(groups) == 1:
                      return u''.join(
                          scheme_key,
                          '://',
                          pattern,
                          groups[0])
docs: Convert a URL to local mercurial URL schemes
  
          Args:
              url (str): URL to map to local mercurial URL schemes
  
          example::
  
              # schemes.gh = git://github.com/
              >> remote_url = git://github.com/westurner/dotfiles'
              >> to_hg_scheme_url(remote_url)
              << gh://westurner/dotfiles