add Default GameRules

examples/postInit/custom/vanilla.groovy

@@ -260,3 +260,8 @@ eventManager.listen(EnderTeleportEvent) { event ->
 command.registerCommand('groovy_test') { server, sender, args ->
     sender.sendMessage('Hello from GroovyScript')
 }
+
+// Default GameRules
+gameRule.add('doDaylightCycle', 'false')
+gameRule.add(['mobGriefing': 'false', 'keepInventory': 'true'])
+gameRule.setWarnNewGameRule(true)

src/main/java/com/cleanroommc/groovyscript/command/GSCommand.java

@@ -4,6 +4,7 @@
 import com.cleanroommc.groovyscript.api.GroovyLog;
 import com.cleanroommc.groovyscript.compat.mods.ModSupport;
 import com.cleanroommc.groovyscript.compat.mods.jei.JeiPlugin;
+import com.cleanroommc.groovyscript.compat.vanilla.VanillaModule;
 import com.cleanroommc.groovyscript.documentation.Documentation;
 import com.cleanroommc.groovyscript.helper.StyleConstant;
 import com.cleanroommc.groovyscript.network.NetworkHandler;
@@ -25,6 +26,7 @@
 import java.io.File;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 
 public class GSCommand extends CommandTreeBase {
 
@@ -58,6 +60,11 @@ public GSCommand() {
         addSubcommand(new InfoLookingCommand());
         addSubcommand(new InfoSelfCommand());
 
+        addSubcommand(new SimpleCommand("applyDefaultGameRules", (server, sender, args) -> {
+            VanillaModule.gameRule.setDefaultGameRules(Objects.requireNonNull(server.getServer()).getEntityWorld().getGameRules());
+            sender.sendMessage(new TextComponentString("Applied the default GameRules to the current world."));
+        }));
+
 
         addSubcommand(new SimpleCommand("wiki", (server, sender, args) -> sender.sendMessage(getTextForUrl("GroovyScript wiki", "Click to open wiki in browser", new TextComponentString("https://cleanroommc.com/groovy-script/"))), "doc", "docs", "documentation"));
 

src/main/java/com/cleanroommc/groovyscript/compat/vanilla/GameRule.java

@@ -0,0 +1,54 @@
+package com.cleanroommc.groovyscript.compat.vanilla;
+
+import com.cleanroommc.groovyscript.api.GroovyBlacklist;
+import com.cleanroommc.groovyscript.api.GroovyLog;
+import com.cleanroommc.groovyscript.api.IScriptReloadable;
+import com.cleanroommc.groovyscript.api.documentation.annotations.MethodDescription;
+import com.cleanroommc.groovyscript.registry.NamedRegistry;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
+import net.minecraft.world.GameRules;
+
+import java.util.Map;
+
+public class GameRule extends NamedRegistry implements IScriptReloadable {
+
+    private static final String LOG_MESSAGE = "Could not find an already existing rule with the name {}. This may be intentional! If it is, you can disable this via `gameRule.setWarnNewGameRule(false)`";
+    private final Map<String, String> defaultGameRules = new Object2ObjectOpenHashMap<>();
+    private boolean warnNewGameRule;
+
+    @GroovyBlacklist
+    public void setDefaultGameRules(GameRules gameRules) {
+        defaultGameRules.forEach((k, v) -> {
+            if (warnNewGameRule && !gameRules.hasRule(k)) GroovyLog.get().warn(LOG_MESSAGE, k);
+            GroovyLog.get().debug("Setting the GameRule '{}' to the value '{}'", k, v);
+            gameRules.setOrCreateGameRule(k, v);
+        });
+        GroovyLog.get().debug("Set or created {} GameRules", defaultGameRules.size());
+    }
+
+    @MethodDescription
+    public void add(String gameRule, String value) {
+        defaultGameRules.put(gameRule, value);
+    }
+
+    @MethodDescription
+    public void add(Map<String, String> gameRules) {
+        defaultGameRules.putAll(gameRules);
+    }
+
+    @MethodDescription
+    public void setWarnNewGameRule(boolean value) {
+        warnNewGameRule = value;
+    }
+
+    @Override
+    @GroovyBlacklist
+    public void onReload() {
+        defaultGameRules.clear();
+        warnNewGameRule = false;
+    }
+
+    @Override
+    @GroovyBlacklist
+    public void afterScriptLoad() {}
+}

src/main/java/com/cleanroommc/groovyscript/compat/vanilla/VanillaModule.java

@@ -27,6 +27,7 @@ public class VanillaModule extends GroovyPropertyContainer implements IScriptRel
     public static final Rarity rarity = new Rarity();
     public static final InWorldCrafting inWorldCrafting = new InWorldCrafting();
     public static final Command command = new Command();
+    public static final GameRule gameRule = new GameRule();
 
     public static void initializeBinding() {
         GroovyScript.getSandbox().registerBinding(crafting);
@@ -38,6 +39,7 @@ public static void initializeBinding() {
         GroovyScript.getSandbox().registerBinding(rarity);
         GroovyScript.getSandbox().registerBinding(inWorldCrafting);
         GroovyScript.getSandbox().registerBinding(command);
+        GroovyScript.getSandbox().registerBinding(gameRule);
 
         ExpansionHelper.mixinClass(ItemStack.class, ItemStackExpansion.class);
         ExpansionHelper.mixinClass(ICommandSender.class, CommandSenderExpansion.class);
@@ -54,6 +56,7 @@ public void onReload() {
         player.onReload();
         inWorldCrafting.onReload();
         command.onReload();
+        gameRule.onReload();
     }
 
     @Override

src/main/java/com/cleanroommc/groovyscript/event/EventHandler.java

@@ -37,6 +37,7 @@
 import net.minecraftforge.common.config.ConfigManager;
 import net.minecraftforge.event.RegistryEvent;
 import net.minecraftforge.event.world.ExplosionEvent;
+import net.minecraftforge.event.world.WorldEvent;
 import net.minecraftforge.fml.client.event.ConfigChangedEvent;
 import net.minecraftforge.fml.common.Loader;
 import net.minecraftforge.fml.common.eventhandler.EventPriority;
@@ -78,6 +79,11 @@ public static void registerTextures(TextureStitchEvent.Post event) {
         GroovyFluid.initTextures(event.getMap());
     }
 
+    @SubscribeEvent
+    public static void createSpawnPosition(WorldEvent.CreateSpawnPosition event) {
+        VanillaModule.gameRule.setDefaultGameRules(event.getWorld().getGameRules());
+    }
+
     @SubscribeEvent
     public static void playerLogin(PlayerEvent.PlayerLoggedInEvent event) {
         // clear all errors and post

src/main/java/com/cleanroommc/groovyscript/sandbox/SandboxData.java

@@ -51,9 +51,9 @@ public static void initialize(File minecraftHome, Logger log) {
         cachePath = new File(SandboxData.minecraftHome, "cache" + File.separator + "groovy");
         // If we are launching with the environment variable set to use the examples folder, use the examples folder for easy and consistent testing.
         if (Boolean.parseBoolean(System.getProperty("groovyscript.use_examples_folder"))) {
-            scriptPath = new File(minecraftHome.getParentFile(), "examples");
+            scriptPath = new File(SandboxData.minecraftHome.getParentFile(), "examples");
         } else {
-            scriptPath = new File(minecraftHome, "groovy");
+            scriptPath = new File(SandboxData.minecraftHome, "groovy");
         }
         try {
             scriptPath = scriptPath.getCanonicalFile();