eval

build.gradle

@@ -33,6 +33,8 @@ dependencies {
 
 	modImplementation include("net.kyori:adventure-text-serializer-legacy:4.13.1")
 
+	modImplementation include("org.luaj:luaj-jse:3.0.1")
+
 	// Uncomment the following line to enable the deprecated Fabric API modules. 
 	// These are included in the Fabric API production distribution and allow you to update your mod to the latest modules at a later more convenient time.
 

src/main/java/land/chipmunk/chipmunkmod/command/CommandManager.java

@@ -78,5 +78,6 @@ public class CommandManager {
     FullBrightCommand.register(dispatcher);
     MusicCommand.register(dispatcher);
     RainbowNameCommand.register(dispatcher);
+    EvalCommand.register(dispatcher);
   }
 }

src/main/java/land/chipmunk/chipmunkmod/commands/EvalCommand.java

@@ -0,0 +1,49 @@
+package land.chipmunk.chipmunkmod.commands;
+
+import com.mojang.brigadier.Command;
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.context.CommandContext;
+import net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+import org.luaj.vm2.Globals;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.jse.CoerceJavaToLua;
+import org.luaj.vm2.lib.jse.JsePlatform;
+
+import static com.mojang.brigadier.arguments.StringArgumentType.getString;
+import static com.mojang.brigadier.arguments.StringArgumentType.greedyString;
+import static land.chipmunk.chipmunkmod.command.CommandManager.argument;
+import static land.chipmunk.chipmunkmod.command.CommandManager.literal;
+
+public class EvalCommand {
+    public static void register (CommandDispatcher<FabricClientCommandSource> dispatcher) {
+        dispatcher.register(
+                literal("eval")
+                        .then(
+                                argument("code", greedyString())
+                                    .executes(EvalCommand::eval)
+                        )
+        );
+    }
+
+    public static int eval (CommandContext<FabricClientCommandSource> context) {
+        final String code = getString(context, "code");
+
+        try {
+            final Globals globals = JsePlatform.standardGlobals();
+
+            globals.set("client", CoerceJavaToLua.coerce(MinecraftClient.getInstance()));
+            globals.set("context", CoerceJavaToLua.coerce(context));
+
+            LuaValue chunk = globals.load(code);
+
+            context.getSource().sendFeedback(Text.literal(chunk.call().toString()).formatted(Formatting.GREEN));
+        } catch (Exception e) {
+            context.getSource().sendError(Text.literal(e.toString()));
+        }
+
+        return Command.SINGLE_SUCCESS;
+    }
+}