1/*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 *   - Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 *
11 *   - Redistributions in binary form must reproduce the above copyright
12 *     notice, this list of conditions and the following disclaimer in the
13 *     documentation and/or other materials provided with the distribution.
14 *
15 *   - Neither the name of Oracle nor the names of its
16 *     contributors may be used to endorse or promote products derived
17 *     from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32// Usage: jjs shell.js
33
34/* This is a simple shell tool in JavaScript.
35 *
36 * Runs any operating system command using Java "exec". When "eval" command is
37 * used, evaluates argument(s) as JavaScript code.
38 */
39
40(function() {
41    // Java classes used
42    var Arrays = Java.type("java.util.Arrays");
43    var BufferedReader = Java.type("java.io.BufferedReader");
44    var InputStreamReader = Java.type("java.io.InputStreamReader");
45    var ProcessBuilder = Java.type("java.lang.ProcessBuilder");
46    var System = Java.type("java.lang.System");
47
48    // print prompt
49    function prompt() {
50        System.out.print("> ");
51    }
52
53    var reader = new BufferedReader(new InputStreamReader(System.in));
54    prompt();
55    // read and evaluate each line from stdin
56    reader.lines().forEach(function(line) {
57        if (! line.isEmpty()) {
58            var args = line.split(' ');
59            try {
60                // special 'eval' command to evaluate JS code
61                if (args[0] == 'eval') {
62                    var code = line.substring('eval'.length);
63                    var res = eval(code);
64                    if (res != undefined) {
65                        print(res);
66                    }
67                } else {
68                    // build child process and start it!
69                    new ProcessBuilder(Arrays.asList(args))
70                        .inheritIO()
71                        .start()
72                        .waitFor();
73                }
74            } catch (e) {
75                // print exception, if any
76                print(e);
77            }
78        }
79        prompt();
80    })
81})()
82