Added quick and dirty uptime command. Thanks Almighty Alpaca for the …

…code.

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

@@ -121,6 +121,7 @@ private static void setupBot()
             jdaBuilder.addListener(help.registerCommand(new EvalCommand()));
             jdaBuilder.addListener(help.registerCommand(new RollCommand()));
             jdaBuilder.addListener(help.registerCommand(new InfoCommand()));
+            jdaBuilder.addListener(help.registerCommand(new UptimeCommand()));
 
             for (IrcConnectInfo info  : settings.getIrcConnectInfos())
             {

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

@@ -0,0 +1,81 @@
+/**
+ *     Copyright 2015-2016 Austin Keener
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.dv8tion.discord.commands;
+
+import net.dv8tion.jda.events.message.MessageReceivedEvent;
+
+import java.lang.management.ManagementFactory;
+import java.util.Arrays;
+import java.util.List;
+
+public class UptimeCommand extends Command
+{
+
+    @Override
+    public void onCommand(MessageReceivedEvent e, String[] args)
+    {
+        //Taken from Almighty Alpaca
+        //https://github.com/Java-Discord-Bot-System/Plugin-Uptime/blob/master/src/main/java/com/almightyalpaca/discord/bot/plugin/uptime/UptimePlugin.java#L28-L42
+        final long duration = ManagementFactory.getRuntimeMXBean().getUptime();
+
+        final long years = duration / 31104000000L;
+        final long months = duration / 2592000000L % 12;
+        final long days = duration / 86400000L % 30;
+        final long hours = duration / 3600000L % 24;
+        final long minutes = duration / 60000L % 60;
+        final long seconds = duration / 1000L % 60;
+        // final long milliseconds = duration % 1000;
+
+        String uptime = (years == 0 ? "" : "**" + years + "** Years, ") + (months == 0 ? "" : "**" + months + "** Months, ") + (days == 0 ? "" : "**" + days + "** Days, ") + (hours == 0 ? "" : "**" + hours + "** Hours, ")
+                + (minutes == 0 ? "" : "**" + minutes + "** Minutes, ") + (seconds == 0 ? "" : "**" + seconds + "** Seconds, ") /* + (milliseconds == 0 ? "" : milliseconds + " Milliseconds, ") */;
+
+        uptime = replaceLast(uptime, ", ", "");
+        uptime = replaceLast(uptime, ",", " and");
+
+        sendMessage(e, "I've been online for:\n" + uptime);
+
+    }
+
+    @Override
+    public List<String> getAliases()
+    {
+        return Arrays.asList(".uptime");
+    }
+
+    @Override
+    public String getDescription()
+    {
+        return "Displays the amount of time that the bot has been up.";
+    }
+
+    @Override
+    public String getName()
+    {
+        return "Uptime Command";
+    }
+
+    @Override
+    public List<String> getUsageInstructions()
+    {
+        return null;
+    }
+
+    //Taken from Almighty Alpaca
+    //https://github.com/Java-Discord-Bot-System/Core/blob/master/src/main/java/com/almightyalpaca/discord/bot/system/util/StringUtils.java#L15-L17
+    private String replaceLast(final String text, final String regex, final String replacement) {
+        return text.replaceFirst("(?s)(.*)" + regex, "$1" + replacement);
+    }
+}