rule management and extensibility

src/main/java/carpet/CarpetExtension.java

@@ -0,0 +1,49 @@
+package carpet;
+
+import carpet.settings.SettingsManager;
+import com.mojang.brigadier.CommandDispatcher;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.command.ServerCommandSource;
+
+public abstract class CarpetExtension
+{
+    /**
+     * When game started before world is loaded
+     */
+    public void onGameStarted() {}
+
+    /**
+     * Runs once per loaded world once the World files / gamerules etc are fully loaded
+     * Can be loaded multiple times in SinglePlayer
+     */
+    public void onServerLoaded(MinecraftServer server) {}
+
+    /**
+     * Runs once per game tick, as a first thing in the tick
+     */
+    public void onTick(MinecraftServer server) {}
+
+    /**
+     * Register your own commands right after vanilla commands are added
+     * If that matters for you
+     */
+    public void registerCommands(CommandDispatcher<ServerCommandSource> dispatcher) {}
+
+    /**
+     * Provide your own custom settings manager managed in the same way as base /carpet
+     * command, but separated to its own command as defined in SettingsManager.
+     */
+    public SettingsManager customSettingsManager() {return null;}
+
+    /**
+     * todiddalidoo
+     */
+    public void onPlayerLoggedIn(PlayerEntity player) {}
+
+    /**
+     * todiddalidoo
+     */
+    public void onPlayerLoggedOut(PlayerEntity player) {}
+
+}