Added .roll command.

src/main/java/net/dv8tion/discord/Yui.java

@@ -110,6 +110,7 @@ private static void setupBot()
             jdaBuilder.addListener(help.registerCommand(new UpdateCommand()));
             jdaBuilder.addListener(help.registerCommand(new PermissionsCommand()));
             jdaBuilder.addListener(help.registerCommand(new EvalCommand()));
+            jdaBuilder.addListener(help.registerCommand(new RollCommand()));
 
             for (IrcConnectInfo info  : settings.getIrcConnectInfos())
             {

src/main/java/net/dv8tion/discord/commands/RollCommand.java

@@ -0,0 +1,99 @@
+package net.dv8tion.discord.commands;
+
+import net.dv8tion.jda.events.message.MessageReceivedEvent;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Random;
+
+/**
+ * Created by Austin on 3/21/2016.
+ */
+public class RollCommand extends Command
+{
+    private final Random dice = new Random();
+    @Override
+    public void onCommand(MessageReceivedEvent e, String[] args)
+    {
+        int lowerBound;
+        int upperBound;
+        int roll;
+
+        if (args.length == 1)
+        {
+            lowerBound = 1;
+            upperBound = 6;
+        }
+        else if (args.length == 2)
+        {
+            lowerBound = 1;
+            try
+            {
+                upperBound = Integer.parseInt(args[1]);
+            }
+            catch (NumberFormatException ex)
+            {
+                sendMessage(e, "The provided upperbound is not an integer! Provided value: " + args[1]);
+                return;
+            }
+        }
+        else
+        {
+            try
+            {
+                lowerBound = Integer.parseInt(args[1]);
+            }
+            catch (NumberFormatException ex)
+            {
+                sendMessage(e, "The provided lowerBound is not an integer! Provided value: " + args[1]);
+                return;
+            }
+
+            try
+            {
+                upperBound = Integer.parseInt(args[2]);
+            }
+            catch (NumberFormatException ex)
+            {
+                sendMessage(e, "The provided upperBound is not an integer! Provided value: " + args[2]);
+                return;
+            }
+        }
+        //Instead of erroring when the upper and lower are out of order, just flip them.
+        if (lowerBound > upperBound)
+        {
+            int temp = upperBound;
+            upperBound = lowerBound;
+            lowerBound = temp;
+        }
+
+        roll = dice.nextInt(upperBound - lowerBound) + lowerBound;
+        sendMessage(e, "Rolled dice with range of [" + lowerBound + " - " + upperBound + "] and got: **" + roll + "**");
+    }
+
+    @Override
+    public List<String> getAliases()
+    {
+        return Arrays.asList(".roll", ".dice");
+    }
+
+    @Override
+    public String getDescription()
+    {
+        return "Rolls the dice and produces a random value.";
+    }
+
+    @Override
+    public String getName()
+    {
+        return "Dice Roll";
+    }
+
+    @Override
+    public List<String> getUsageInstructions()
+    {
+        return Arrays.asList("\n`.roll` - Returns a roll of a 6 sided die (1 - 6)\n\n" +
+                "`.roll [upperLimit]` - Returns a roll of [1 - upperLimit]\n\n" +
+                "`.roll [lowerLimit] [upperLimit]` - Returns a roll of [lower - upper]");
+    }
+}