jlaskey@3: /*
sundar@851:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962:  *
jlaskey@3:  * Redistribution and use in source and binary forms, with or without
jlaskey@3:  * modification, are permitted provided that the following conditions
jlaskey@3:  * are met:
attila@962:  *
jlaskey@3:  *   - Redistributions of source code must retain the above copyright
jlaskey@3:  *     notice, this list of conditions and the following disclaimer.
attila@962:  *
jlaskey@3:  *   - Redistributions in binary form must reproduce the above copyright
jlaskey@3:  *     notice, this list of conditions and the following disclaimer in the
jlaskey@3:  *     documentation and/or other materials provided with the distribution.
attila@962:  *
jlaskey@3:  *   - Neither the name of Oracle nor the names of its
jlaskey@3:  *     contributors may be used to endorse or promote products derived
jlaskey@3:  *     from this software without specific prior written permission.
attila@962:  *
jlaskey@3:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
jlaskey@3:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
jlaskey@3:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
jlaskey@3:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
jlaskey@3:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
jlaskey@3:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
jlaskey@3:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
jlaskey@3:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
jlaskey@3:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
jlaskey@3:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
jlaskey@3:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jlaskey@3:  */
jlaskey@3: 
sundar@851: // Usage: jjs shell.js
sundar@851: 
sundar@851: /* This is a simple shell tool in JavaScript.
jlaskey@3:  *
jlaskey@3:  * Runs any operating system command using Java "exec". When "eval" command is
jlaskey@3:  * used, evaluates argument(s) as JavaScript code.
jlaskey@3:  */
jlaskey@3: 
sundar@851: (function() {
sundar@851:     // Java classes used
sundar@851:     var Arrays = Java.type("java.util.Arrays");
sundar@851:     var BufferedReader = Java.type("java.io.BufferedReader");
sundar@851:     var InputStreamReader = Java.type("java.io.InputStreamReader");
sundar@851:     var ProcessBuilder = Java.type("java.lang.ProcessBuilder");
sundar@851:     var System = Java.type("java.lang.System");
jlaskey@3: 
sundar@851:     // print prompt
sundar@851:     function prompt() {
sundar@851:         System.out.print("> ");
sundar@851:     }
jlaskey@3: 
sundar@851:     var reader = new BufferedReader(new InputStreamReader(System.in));
jlaskey@3:     prompt();
sundar@851:     // read and evaluate each line from stdin
sundar@851:     reader.lines().forEach(function(line) {
sundar@851:         if (! line.isEmpty()) {
sundar@851:             var args = line.split(' ');
jlaskey@3:             try {
sundar@851:                 // special 'eval' command to evaluate JS code
sundar@851:                 if (args[0] == 'eval') {
sundar@851:                     var code = line.substring('eval'.length);
jlaskey@3:                     var res = eval(code);
jlaskey@3:                     if (res != undefined) {
jlaskey@3:                         print(res);
jlaskey@3:                     }
jlaskey@3:                 } else {
sundar@851:                     // build child process and start it!
attila@1239:                     new ProcessBuilder(Arrays.asList(args))
sundar@851:                         .inheritIO()
sundar@851:                         .start()
sundar@851:                         .waitFor();
jlaskey@3:                 }
jlaskey@3:             } catch (e) {
sundar@851:                 // print exception, if any
jlaskey@3:                 print(e);
jlaskey@3:             }
jlaskey@3:         }
jlaskey@3:         prompt();
sundar@851:     })
sundar@851: })()