001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.xbean.command;
018
019import groovy.lang.GroovyShell;
020import org.codehaus.groovy.runtime.InvokerHelper;
021
022import java.io.BufferedReader;
023import java.io.IOException;
024import java.io.InputStream;
025import java.io.InputStreamReader;
026import java.io.PrintStream;
027
028public class GroovySh implements Command {
029    public static void register() {
030        CommandRegistry.register("groovysh", GroovySh.class);
031    }
032
033    public int main(String[] args, InputStream in, PrintStream out) {
034        GroovyShell shell = new GroovyShell();
035        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
036        String version = InvokerHelper.getVersion();
037        out.println("Lets get Groovy!");
038        out.println("================");
039        out.println("Version: " + version + " JVM: " + System.getProperty("java.vm.version"));
040        out.println("Hit carriage return twice to execute a command");
041        out.println("The command 'quit' will terminate the shell");
042        int counter = 1;
043        while (true) {
044            StringBuffer buffer = new StringBuffer();
045            while (true) {
046                out.print("groovy> ");
047                String line;
048                try {
049                    line = reader.readLine();
050                } catch (IOException e) {
051                    out.println("Caught: " + e);
052                    e.printStackTrace();
053                    return -1;
054                }
055                if (line != null) {
056                    buffer.append(line);
057                    buffer.append('\n');
058                }
059                if (line == null || line.trim().length() == 0) {
060                    break;
061                }
062            }
063            String command = buffer.toString().trim();
064            if (command == null || command.equals("quit")) {
065                break;
066            }
067            try {
068                Object answer = shell.evaluate(command, "CommandLine" + counter++ + ".groovy");
069                out.println(InvokerHelper.inspect(answer));
070            } catch (Exception e) {
071                out.println("Caught: " + e);
072                e.printStackTrace();
073            }
074        }
075        return 0;
076    }
077}