gd: added menu template

menus/scenes/menus/level_select_menu/level_select_menu.gd

@@ -0,0 +1,33 @@
+extends Control
+
+## Loads a simple ItemList node within a margin container. SceneLister updates
+## the available scenes in the directory provided. Activating a level will update
+## the GameState's current_level, and emit a signal. The main menu node will trigger
+## a load action from that signal.
+
+@onready var level_buttons_container: ItemList = %LevelButtonsContainer
+@onready var scene_lister: SceneLister = $SceneLister
+
+signal level_selected
+		
+func _ready() -> void:
+	add_levels_to_container()
+	
+## A fresh level list is propgated into the ItemList, and the file names are cleaned
+func add_levels_to_container() -> void:
+	level_buttons_container.clear()
+	var max_level_reached := GameState.get_max_level_reached()
+	var level_iter := 0
+	for file_path in scene_lister.files:
+		if level_iter > max_level_reached : break
+		level_iter += 1
+		var file_name := file_path.get_file()  # e.g., "level_1.tscn"
+		file_name = file_name.trim_suffix(".tscn")  # Remove the ".tscn" extension
+		file_name = file_name.replace("_", " ")  # Replace underscores with spaces
+		file_name = file_name.capitalize()  # Convert to proper case
+		var button_name := str(file_name)
+		level_buttons_container.add_item(button_name)
+
+func _on_level_buttons_container_item_activated(index: int) -> void:
+	GameState.set_current_level(index)
+	level_selected.emit()