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