Add default SpawnpointCommand. Partially fixes BUKKIT-2671

By: EvilSeph <evilseph@gmail.com>

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

@@ -55,6 +55,7 @@ public class SimpleCommandMap implements CommandMap {
         fallbackCommands.add(new SeedCommand());
         fallbackCommands.add(new DifficultyCommand());
         fallbackCommands.add(new WeatherCommand());
+        fallbackCommands.add(new SpawnpointCommand());
     }
 
     public SimpleCommandMap(final Server server) {

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

@@ -0,0 +1,83 @@
+package org.bukkit.command.defaults;
+
+import com.google.common.collect.ImmutableList;
+import org.apache.commons.lang.Validate;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.List;
+
+public class SpawnpointCommand extends VanillaCommand {
+
+    public SpawnpointCommand() {
+        super("spawnpoint");
+        this.description = "Sets a player's spawn point";
+        this.usageMessage = "/spawnpoint OR /spawnpoint <player> OR /spawnpoint <player> <x> <y> <z>";
+        this.setPermission("bukkit.command.spawnpoint");
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String currentAlias, String[] args) {
+        if (!testPermission(sender)) return true;
+
+        Player player;
+
+        if (args.length == 0) {
+            if (sender instanceof Player) {
+                player = (Player) sender;
+            } else {
+                sender.sendMessage("Please provide a player!");
+                return true;
+            }
+        } else {
+            player = Bukkit.getPlayerExact(args[0]);
+        }
+
+        World world = player.getWorld();
+
+        if (args.length == 4) {
+            if (world != null) {
+                int pos = 1;
+                int maxPos = 30000000;
+                int x = getInteger(sender, args[pos++], -maxPos, maxPos);
+                int y = getInteger(sender, args[pos++], 0, world.getMaxHeight());
+                int z = getInteger(sender, args[pos], -maxPos, maxPos);
+
+                player.setBedSpawnLocation(new Location(world, x, y, z), true);
+                sender.sendMessage("Set " + player.getDisplayName() + "'s spawnpoint to " + x + ", " + y + ", " + z);
+            }
+        } else if (args.length <= 1) {
+            Location location = player.getLocation();
+            player.setBedSpawnLocation(location, true);
+            sender.sendMessage("Set " + player.getDisplayName() + "'s spawnpoint to " + location.getX() + ", " + location.getY() + ", " + location.getZ());
+        } else {
+            sender.sendMessage(ChatColor.RED + "Usage: " + usageMessage);
+            return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public boolean matches(String input) {
+        return input.equalsIgnoreCase("spawnpoint");
+    }
+
+    @Override
+    public List<String> tabComplete(CommandSender sender, String alias, String[] args) {
+        Validate.notNull(sender, "Sender cannot be null");
+        Validate.notNull(args, "Arguments cannot be null");
+        Validate.notNull(alias, "Alias cannot be null");
+
+        if (args.length == 1) {
+            return super.tabComplete(sender, alias, args);
+        }
+
+        return ImmutableList.of();
+    }
+}