/**

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You 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.apache.xbean.command;

 import groovy.lang.GroovyShell;

 import org.codehaus.groovy.runtime.InvokerHelper;

 import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.InputStreamReader;

 import java.io.PrintStream;

 public class GroovySh implements Command {

     public static void register() {

         CommandRegistry.register("groovysh", GroovySh.class);

     }

     public int main(String[] args, InputStream in, PrintStream out) {

         GroovyShell shell = new GroovyShell();

         BufferedReader reader = new BufferedReader(new InputStreamReader(in));

         String version = InvokerHelper.getVersion();

         out.println("Lets get Groovy!");

         out.println("================");

         out.println("Version: " + version + " JVM: " + System.getProperty("java.vm.version"));

         out.println("Hit carriage return twice to execute a command");

         out.println("The command 'quit' will terminate the shell");

         int counter = 1;

         while (true) {

             StringBuffer buffer = new StringBuffer();

             while (true) {

                 out.print("groovy> ");

                 String line;

                 try {

                     line = reader.readLine();

                 } catch (IOException e) {

                     out.println("Caught: " + e);

                     e.printStackTrace();

                     return -1;

                 }

                 if (line != null) {

                     buffer.append(line);

                     buffer.append('\n');

                 }

                 if (line == null || line.trim().length() == 0) {

                     break;

                 }

             }

             String command = buffer.toString().trim();

             if (command == null || command.equals("quit")) {

                 break;

             }

             try {

                 Object answer = shell.evaluate(command, "CommandLine" + counter++ + ".groovy");

                 out.println(InvokerHelper.inspect(answer));

             } catch (Exception e) {

                 out.println("Caught: " + e);

                 e.printStackTrace();

             }

         }

         return 0;

     }

 }