implement /mv gamerules command

src/main/java/com/onarandombox/MultiverseCore/commands/GamerulesCommand.java

@@ -0,0 +1,109 @@
+package com.onarandombox.MultiverseCore.commands;
+
+import co.aikar.commands.BukkitCommandIssuer;
+import co.aikar.commands.annotation.CommandAlias;
+import co.aikar.commands.annotation.CommandCompletion;
+import co.aikar.commands.annotation.CommandPermission;
+import co.aikar.commands.annotation.Description;
+import co.aikar.commands.annotation.Flags;
+import co.aikar.commands.annotation.Single;
+import co.aikar.commands.annotation.Subcommand;
+import co.aikar.commands.annotation.Syntax;
+import com.dumptruckman.minecraft.util.Logging;
+import com.onarandombox.MultiverseCore.api.MVWorld;
+import com.onarandombox.MultiverseCore.api.MVWorldManager;
+import com.onarandombox.MultiverseCore.commandtools.MVCommandManager;
+import com.onarandombox.MultiverseCore.commandtools.MultiverseCommand;
+import jakarta.inject.Inject;
+import org.bukkit.GameRule;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jvnet.hk2.annotations.Service;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * List all gamerules in your current or specified world
+ */
+@Service
+@CommandAlias("mv")
+public class GamerulesCommand extends MultiverseCommand {
+
+    private final MVWorldManager worldManager;
+
+    @Inject
+    public GamerulesCommand(@NotNull MVCommandManager commandManager, @NotNull MVWorldManager worldManager) {
+        super(commandManager);
+        this.worldManager = worldManager;
+    }
+
+    @Subcommand("gamerules|rules")
+    @CommandPermission("multiverse.core.gamerules.list")
+    @CommandCompletion("@mvworlds")
+    @Syntax("[World]")
+    @Description("{@@mv-core.gamerules.description}") //TODO i18n
+    public void onGamerulesCommand(@NotNull BukkitCommandIssuer issuer,
+
+                                   @Flags("resolve=issuerOnly")
+                                   Player player,
+
+                                   @Single
+                                   @Syntax("<world>")
+                                   @Description("{@@mv-core.gamerules.world.description}") //TODO i18n
+                                   MVWorld world
+    ) {
+        if (!issuer.isPlayer()) {
+            if (world == null) {
+                issuer.sendMessage("You must specify a world from the command line");
+                return;
+            }
+        }
+
+        // Get the players world if none is specified
+        if (world == null) {
+            Logging.finer("Getting the player's current world to list gamerules for");
+            world = worldManager.getMVWorld(player.getWorld());
+        }
+
+        issuer.sendMessage("--- Gamerules for " + world.getName() + " ---\n" + encodeMap(getGameRuleMap(world.getCBWorld())));
+
+
+
+    }
+
+    /**
+     * Gets all the gamerules and their values for a given world
+     * @param world The world to find gamerules for
+     * @return A map of the gamerules and their values
+     */
+    private Map<String, String> getGameRuleMap(World world) {
+        Map<String, String> gameRuleMap = new HashMap<>();
+
+        for (GameRule<?> gamerule : GameRule.values()) {
+            Object gameruleValue = world.getGameRuleValue(gamerule);
+            if (gameruleValue == null) {
+                gameRuleMap.put(gamerule.getName(), "null");
+                continue;
+            }
+            gameRuleMap.put(gamerule.getName(), gameruleValue.toString());
+        }
+        return gameRuleMap;
+    }
+
+    private String encodeMap(Map<String, String> inMap) { //TODO i18n
+        StringBuilder stringBuilder = new StringBuilder();
+        for (String key : inMap.keySet()) {
+            String value = inMap.get(key);
+
+            stringBuilder
+                    .append("&l")
+                    .append(key)
+                    .append("&f : &6")
+                    .append(value)
+                    .append("\n");
+        }
+        return stringBuilder.toString();
+    }
+}