/*
 * Copyright 2012-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.cli.command.shell;

import java.util.Stack;

/**
 * Abstraction to manage a stack of prompts.
 * 
 * @author Phillip Webb
 */
public class ShellPrompts {

	private static final String DEFAULT_PROMPT = "$ ";

	private final Stack<String> prompts = new Stack<String>();

	/**
	 * Push a new prompt to be used by the shell.
	 * @param prompt the prompt
	 * @see #popPrompt()
	 */
	public void pushPrompt(String prompt) {
		this.prompts.push(prompt);
	}

	/**
	 * Pop a previously pushed prompt, returning to the previous value.
	 * @see #pushPrompt(String)
	 */
	public void popPrompt() {
		this.prompts.pop();
	}

	/**
	 * Returns the current prompt.
	 */
	public String getPrompt() {
		return this.prompts.isEmpty() ? DEFAULT_PROMPT : this.prompts.peek();
	}
}

@@ -1230,24 +1230,58 @@
 pPrompt() %7B%0A
+%09%09if (!this.prompts.isEmpty()) %7B%0A%09
 %09%09this.promp
@@ -1290,16 +1290,20 @@
 .pop();%0A
+%09%09%7D%0A
 %09%7D%0A%0A%09/**

Prevent EmptyStackException in case no stack of prompts is empty