shell.js revision 1177:8e86c58cbb00 
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 List = Java.type("java.util.List");
46    var ProcessBuilder = Java.type("java.lang.ProcessBuilder");
47    var System = Java.type("java.lang.System");
48
49    // print prompt
50    function prompt() {
51        System.out.print("> ");
52    }
53
54    var reader = new BufferedReader(new InputStreamReader(System.in));
55    prompt();
56    // read and evaluate each line from stdin
57    reader.lines().forEach(function(line) {
58        if (! line.isEmpty()) {
59            var args = line.split(' ');
60            try {
61                // special 'eval' command to evaluate JS code
62                if (args[0] == 'eval') {
63                    var code = line.substring('eval'.length);
64                    var res = eval(code);
65                    if (res != undefined) {
66                        print(res);
67                    }
68                } else {
69                    // build child process and start it!
70                    new ProcessBuilder(Java.to(args, List))
71                        .inheritIO()
72                        .start()
73                        .waitFor();
74                }
75            } catch (e) {
76                // print exception, if any
77                print(e);
78            }
79        }
80        prompt();
81    })
82})()
83