def list
      Cli::Environments::EvaluateOnly.new(options).evaluate
      DslDescriber.new.list
    end
def list
      Cli::Environments::EvaluateOnly.new(options).evaluate
      DslDescriber.new.list
    end
List the Guard plugins that are available for use in your system and
 marks those that are currently used in your `Guardfile`.

 @see Guard::DslDescriber.list