Added GameMode command.

By: EvilSeph <evilseph@gmail.com>

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

@@ -1,5 +1,8 @@
 package org.bukkit;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import org.bukkit.entity.HumanEntity;
 
 /**
@@ -9,10 +12,42 @@ public enum GameMode {
     /**
      * Creative mode may fly, build instantly, become invulnerable and create free items
      */
-    CREATIVE,
+    CREATIVE(1),
 
     /**
      * Survival mode is the "normal" gameplay type, with no special features.
      */
-    SURVIVAL;
+    SURVIVAL(0);
+
+    private final int value;
+    private final static Map<Integer, GameMode> modes = new HashMap<Integer, GameMode>();
+
+    private GameMode(final int value) {
+        this.value = value;
+    }
+
+    /**
+     * Gets the mode value associated with this GameMode
+     *
+     * @return An integer value of this gamemode
+     */
+    public int getValue() {
+        return value;
+    }
+
+    /**
+     * Gets the GameMode represented by the specified value
+     *
+     * @param value Value to check
+     * @return Associative {@link GameMode} with the given value, or null if it doesn't exist
+     */
+    public static GameMode getByValue(final int value) {
+        return modes.get(value);
+    }
+
+    static {
+        for (GameMode mode : GameMode.values()) {
+            modes.put(mode.getValue(), mode);
+        }
+    }
 }

paper-api/src/main/java/org/bukkit/command/SimpleCommandMap.java

@@ -38,6 +38,7 @@ public class SimpleCommandMap implements CommandMap {
         fallbackCommands.add(new TellCommand());
         fallbackCommands.add(new MeCommand());
         fallbackCommands.add(new KillCommand());
+        fallbackCommands.add(new GameModeCommand());
         fallbackCommands.add(new HelpCommand());
     }
 

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

@@ -0,0 +1,59 @@
+package org.bukkit.command.defaults;
+
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.GameMode;
+
+public class GameModeCommand extends VanillaCommand {
+    public GameModeCommand() {
+        super("gamemode");
+        this.description = "Changes the player to a specific game mode";
+        this.usageMessage = "/gamemode <player> <gamemode>";
+        this.setPermission("bukkit.command.gamemode");
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String currentAlias, String[] args) {
+        if (!testPermission(sender)) return true;
+        if (args.length != 2) {
+            sender.sendMessage(ChatColor.RED + "Usage: " + usageMessage);
+            return false;
+        }
+
+        Player player = Bukkit.getPlayerExact(args[0]);
+
+        if (player != null) {
+            int value = -1;
+
+            try {
+                value = Integer.parseInt(args[1]);
+            } catch (NumberFormatException ex) {}
+
+            GameMode mode = GameMode.getByValue(value);
+
+            if (mode != null) {
+                if (mode != player.getGameMode()) {
+                    Command.broadcastCommandMessage(sender, "Setting " + player.getName() + " to game mode " + mode.getValue());
+
+                    player.setGameMode(mode);
+                } else {
+                    sender.sendMessage(player.getName() + " already has game mode" + mode.getValue());
+                }
+            } else {
+                sender.sendMessage("There is no game mode with id " + args[1]);
+            }
+        } else {
+            sender.sendMessage("Can't find user " + args[0]);
+        }
+
+        return true;
+    }
+
+    @Override
+    public boolean matches(String input) {
+        return input.startsWith("gamemode ");
+    }
+}

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

@@ -32,6 +32,7 @@ public class HelpCommand extends VanillaCommand {
         sender.sendMessage("list                      lists all currently connected players");
         sender.sendMessage("say <message>             broadcasts a message to all players");
         sender.sendMessage("time <add|set> <amount>   adds to or sets the world time (0-24000)");
+        sender.sendMessage("gamemode <player> <mode>  sets player\'s game mode (0 or 1)");
 
         return true;
     }

paper-api/src/main/java/org/bukkit/util/permissions/CommandPermissions.java

@@ -103,6 +103,7 @@ public final class CommandPermissions {
         DefaultPermissions.registerPermission(PREFIX + "plugins", "Allows the user to view the list of plugins running on this server", PermissionDefault.TRUE, commands);
         DefaultPermissions.registerPermission(PREFIX + "reload", "Allows the user to reload the server settings", PermissionDefault.OP, commands);
         DefaultPermissions.registerPermission(PREFIX + "version", "Allows the user to view the version of the server", PermissionDefault.TRUE, commands);
+        DefaultPermissions.registerPermission(PREFIX + "gamemode", "Allows the user to change the gamemode of another player", PermissionDefault.TRUE, commands);
 
         commands.recalculatePermissibles();