docs: def status_subversion(path, ignore_set, options):
      """Run svn status.
  
      Returns a 2-element tuple:
      * Text lines describing the status of the repository.
      * Empty sequence of subrepos, since svn does not support them.
      """
      subrepos = ()
      if path in ignore_set:
          return None, subrepos
      keepers = []
      for line in run(['svn', 'st', '-v'], cwd=path):
          if not line.strip():
              continue
          if line.startswith(b'Performing') or line[0] in b'X?':
              continue
          status = line[:8]
          ignored_states = options.ignore_svn_states
          if ignored_states and status.strip() in ignored_states:
              continue
          filename = line[8:].split(None, 3)[-1]
          ignore_set.add(os.path.join(path, filename))
          if status.strip():
              keepers.append(b' ' + status + filename)
      return keepers, subrepos