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