Added Gui Command

src/main/java/xyz/soukup/ecoCraftCore/EcoCraftCore.java

@@ -9,6 +9,7 @@ import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginManager;
 import org.bukkit.plugin.java.JavaPlugin;
 import org.jetbrains.annotations.NotNull;
+import xyz.soukup.ecoCraftCore.commands.GuiCommand;
 import xyz.soukup.ecoCraftCore.commands.MoneyCommand;
 import xyz.soukup.ecoCraftCore.commands.RulerCommand;
 import xyz.soukup.ecoCraftCore.commands.ShopCommand;
@@ -98,6 +99,7 @@ public final class EcoCraftCore extends JavaPlugin {
         lm.registerEventHandler(LifecycleEvents.COMMANDS, event -> event.registrar().register(ShopCommand.createCommand().build()));
         lm.registerEventHandler(LifecycleEvents.COMMANDS, event -> event.registrar().register(RulerCommand.createCommand().build()));
         lm.registerEventHandler(LifecycleEvents.COMMANDS, event -> event.registrar().register(MoneyCommand.createCommand().build()));
+        lm.registerEventHandler(LifecycleEvents.COMMANDS, event -> event.registrar().register(GuiCommand.createCommand().build()));
     }
 
     private void registerEvents(){

src/main/java/xyz/soukup/ecoCraftCore/commands/GuiCommand.java

@@ -0,0 +1,37 @@
+package xyz.soukup.ecoCraftCore.commands;
+
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import io.papermc.paper.command.brigadier.Commands;
+import com.mojang.brigadier.context.CommandContext;
+import xyz.soukup.ecoCraftCore.utilities.Messages;
+import net.kyori.adventure.text.Component;
+import org.bukkit.command.CommandSender;
+import dev.triumphteam.gui.guis.Gui;
+import org.bukkit.entity.Player;
+
+public class GuiCommand {
+    public static LiteralArgumentBuilder<CommandSourceStack> createCommand() {
+        return Commands.literal("gopen")
+                .executes(GuiCommand::obtainGui);
+    }
+
+    private static int obtainGui(CommandContext<CommandSourceStack> context){
+
+        CommandSender commandSender = context.getSource().getSender();
+
+        if (!(commandSender instanceof Player)){
+            Messages.send(commandSender, "generic.error.not-player");
+            return 0;
+        }
+
+        Gui gui = Gui.gui()
+                .title(Component.text("GUI Title!"))
+                .rows(6)
+                .create();
+
+        gui.open((Player) commandSender);
+        return 1;
+    }
+}
+