public void WithStandardInputPrompt(string prompt, Action <string> action)
        {
            if ((bool)ReplWindow.GetOptionValue(ReplOptions.DisplayPromptInMargin))
            {
                action(String.Empty);
                return;
            }

            string oldPrompt = (string)ReplWindow.GetOptionValue(ReplOptions.StandardInputPrompt);

            ReplWindow.SetOptionValue(ReplOptions.StandardInputPrompt, prompt);
            try {
                action(prompt);
            } finally {
                ReplWindow.SetOptionValue(ReplOptions.StandardInputPrompt, oldPrompt);
            }
        }