Enhances /debug configstats to allow regex searching

Change-Id: Iffb6510e985c142396cd0e72bea0bde8a86ba4b4
Reviewed-on: http://gerrit.dmdirc.com/419
Tested-by: Gregory Holmes <greboid@dmdirc.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/commandparser/commands/global/Debug.java

@@ -170,19 +170,45 @@ public class Debug extends GlobalCommand implements IntelligentCommand {
                     arg = Integer.MAX_VALUE;
                 }
                 doConfigStatsTop(origin, isSilent, arg);
-            } else {
+            } else if (args[1].matches("^[0-9]+$")) {
                 try {
                     arg = Integer.parseInt(args[1]);
                 } catch (NumberFormatException e) {
                     arg = -1;
                 }
                 doConfigStatsCutOff(origin, isSilent, arg);
+            } else {
+                doConfigStatsOption(origin, isSilent, args[1]);
             }
         } else {
             doConfigStatsCutOff(origin, isSilent, arg);
         }
     }
 
+    /**
+     * Shows stats related to the config system, showing any options matching
+     * the regex
+     *
+     * @param origin The window this command was executed in
+     * @param isSilent Whether this command has been silenced or not
+     * @param regex Regex to match options against
+     */
+    private void doConfigStatsOption(final InputWindow origin,
+            final boolean isSilent, final String regex) {
+        final SortedSet<Entry<String, Integer>> sortedStats = getSortedStats();
+        boolean found = false;
+        for (Map.Entry<String, Integer> entry : sortedStats) {
+            if (entry.getKey().matches(regex)) {
+                sendLine(origin, isSilent, FORMAT_OUTPUT, entry.getKey() + " - " +
+                    entry.getValue());
+                found = true;
+            }
+        }
+        if (!found) {
+            sendLine(origin, isSilent, FORMAT_ERROR, "Unable to locate option.");
+        }
+    }
+
     /**
      * Shows stats related to the config system, listing the top X number of
      * options.