content: /*
   * [The "BSD licence"]
   * Copyright (c) 2010 Ben Gruver
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package org.jf.util;
  
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public class ConsoleUtil {
      /**
       * Attempt to find the width of the console. If it can't get the width, return a default of 80
       * @return The current console width
       */
      public static int getConsoleWidth() {
          if (System.getProperty("os.name").toLowerCase().contains("windows")) {
              try {
                  return attemptMode();
              } catch (Exception ex) {
              }
          } else {
              try {
                  return attemptStty();
              } catch (Exception ex) {
              }
          }
  
          return 80;
      }
  
      private static int attemptStty() {
          String output = attemptCommand(new String[]{"sh", "-c", "stty size < /dev/tty"});
          if (output == null) {
              return 80;
          }
  
          String[] vals = output.split(" ");
          if (vals.length < 2) {
              return 80;
          }
          return Integer.parseInt(vals[1]);
      }
  
      private static int attemptMode() {
          String output = attemptCommand(new String[]{"mode", "con"});
          if (output == null) {
              return 80;
          }
  
          Pattern pattern = Pattern.compile("Columns:[ \t]*(\\d+)");
          Matcher m = pattern.matcher(output);
          if (!m.find()) {
              return 80;
          }
  
          return Integer.parseInt(m.group(1));
      }
  
      private static String attemptCommand(String[] command) {
          StringBuffer buffer = null;
  
          try {
  
              Process p = Runtime.getRuntime().exec(command);
              BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
  
              String line;
  
              while ((line = reader.readLine()) != null) {
                  if (buffer == null) {
                      buffer = new StringBuffer();
                  }
  
                  buffer.append(line);
              }
  
              if (buffer != null) {
                  return buffer.toString();
              }
              return null;
          } catch (Exception ex) {
              return null;
          }
      }
  }
  