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 })()