docs: def complete_run(self, text, line, b, e):
          ''' Autocomplete file names with .forth ending. '''
          # Don't break on path separators.
          text = line.split()[-1]
  
          # Try to find files with a forth file ending, .fs.
          forth_files = glob.glob(text + '*.fs')
  
          # Failing that, just try and complete something.
          if len(forth_files) == 0:
              return [f.split(os.path.sep)[-1] for f in glob.glob(text + '*')]
  
          forth_files = [f.split(os.path.sep)[-1] for f in forth_files]
          return forth_files