Add getShutdownMessage() and stop command arguments. Adds BUKKIT-3031

By: feildmaster <admin@feildmaster.com>

paper-api/src/main/java/org/bukkit/Bukkit.java

@@ -383,6 +383,10 @@ public final class Bukkit {
         return server.getMotd();
     }
 
+    public static String getShutdownMessage() {
+        return server.getShutdownMessage();
+    }
+
     public static WarningState getWarningState() {
         return server.getWarningState();
     }

paper-api/src/main/java/org/bukkit/Server.java

@@ -666,6 +666,13 @@ public interface Server extends PluginMessageRecipient {
      */
     String getMotd();
 
+    /**
+     * Gets the default message that is displayed when the server is stopped
+     *
+     * @return the shutdown message
+     */
+    String getShutdownMessage();
+
     /**
      * Gets the current warning state for the server
      *

paper-api/src/main/java/org/bukkit/command/defaults/StopCommand.java

@@ -2,18 +2,21 @@ package org.bukkit.command.defaults;
 
 import java.util.List;
 
+import org.apache.commons.lang.StringUtils;
 import org.apache.commons.lang.Validate;
+
 import org.bukkit.Bukkit;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
 
 import com.google.common.collect.ImmutableList;
 
 public class StopCommand extends VanillaCommand {
     public StopCommand() {
         super("stop");
-        this.description = "Stops the server";
-        this.usageMessage = "/stop";
+        this.description = "Stops the server with optional reason";
+        this.usageMessage = "/stop [reason]";
         this.setPermission("bukkit.command.stop");
     }
 
@@ -24,6 +27,13 @@ public class StopCommand extends VanillaCommand {
         Command.broadcastCommandMessage(sender, "Stopping the server..");
         Bukkit.shutdown();
 
+        String reason = this.createString(args, 0);
+        if (StringUtils.isNotEmpty(reason)) {
+            for (Player player : Bukkit.getOnlinePlayers()) {
+                player.kickPlayer(reason);
+            }
+        }
+
         return true;
     }