def read_history
    return super if History.disabled?
    File.exist?(history_file_path) && history.empty? &&
      File.readlines(history_file_path).each{ |e| history << e.chomp }
  end
def read_history
    return super if History.disabled?
    File.exist?(history_file_path) && history.empty? &&
      File.readlines(history_file_path).each{ |e| history << e.chomp }
  end
Read config[:history_file] into #history, handled in history_file plugin