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 */
28package org.jf.util;
29
30import java.io.BufferedReader;
31import java.io.InputStreamReader;
32import java.util.regex.Matcher;
33import java.util.regex.Pattern;
34
35public 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
39     */
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
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
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
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