Add support for detecting the console width in unix and windows environments, and printing the usage info accordingly

git-svn-id: https://smali.googlecode.com/svn/trunk@666 55b6fa8a-2a1e-11de-a435-ffa8d773f76a

util/src/main/java/org/jf/util/ConsoleUtil.java

@@ -0,0 +1,110 @@
+/*
+ * [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
+     */
+    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;
+        }
+    }
+}