1 /* 2 * [The "BSD licence"] 3 * Copyright (c) 2010 Ben Gruver 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 package org.jf.util; 29 30 import java.io.BufferedReader; 31 import java.io.InputStreamReader; 32 import java.util.regex.Matcher; 33 import java.util.regex.Pattern; 34 35 public class ConsoleUtil { 36 /** 37 * Attempt to find the width of the console. If it can't get the width, return a default of 80 38 * @return The current console width 39 */ getConsoleWidth()40 public static int getConsoleWidth() { 41 if (System.getProperty("os.name").toLowerCase().contains("windows")) { 42 try { 43 return attemptMode(); 44 } catch (Exception ex) { 45 } 46 } else { 47 try { 48 return attemptStty(); 49 } catch (Exception ex) { 50 } 51 } 52 53 return 80; 54 } 55 attemptStty()56 private static int attemptStty() { 57 String output = attemptCommand(new String[]{"sh", "-c", "stty size < /dev/tty"}); 58 if (output == null) { 59 return 80; 60 } 61 62 String[] vals = output.split(" "); 63 if (vals.length < 2) { 64 return 80; 65 } 66 return Integer.parseInt(vals[1]); 67 } 68 attemptMode()69 private static int attemptMode() { 70 String output = attemptCommand(new String[]{"mode", "con"}); 71 if (output == null) { 72 return 80; 73 } 74 75 Pattern pattern = Pattern.compile("Columns:[ \t]*(\\d+)"); 76 Matcher m = pattern.matcher(output); 77 if (!m.find()) { 78 return 80; 79 } 80 81 return Integer.parseInt(m.group(1)); 82 } 83 attemptCommand(String[] command)84 private static String attemptCommand(String[] command) { 85 StringBuffer buffer = null; 86 87 try { 88 89 Process p = Runtime.getRuntime().exec(command); 90 BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream())); 91 92 String line; 93 94 while ((line = reader.readLine()) != null) { 95 if (buffer == null) { 96 buffer = new StringBuffer(); 97 } 98 99 buffer.append(line); 100 } 101 102 if (buffer != null) { 103 return buffer.toString(); 104 } 105 return null; 106 } catch (Exception ex) { 107 return null; 108 } 109 } 110 } 111