add todos app

todos/global.gd

@@ -0,0 +1,72 @@
+extends Node
+# https://docs.godotengine.org/en/stable/tutorials/scripting/singletons_autoload.html
+
+signal state_changed(previous, new)
+
+enum State {UNLOADED, LOADED}
+
+const config_path = "user://logue.cfg"
+
+var config = ConfigFile.new()
+var db = SQLite.new()
+var current_scene = null
+var current_state = State.UNLOADED
+
+func _ready():
+	var root = get_tree().root
+	current_scene = root.get_child(root.get_child_count() - 1)
+	
+	db.verbosity_level = SQLite.VERBOSE
+	
+	var err = config.load(config_path)
+	if err == OK:
+		var db_path = config.get_value("general", "db_path")
+		var db_success = load_db(db_path)
+		if not db_success:
+			# HACK: File picker on Android is broken
+			const possible_cfg_paths = ["/foo/bar/logue.cfg"]
+			for possible_path in possible_cfg_paths:
+				if FileAccess.file_exists(possible_path):
+					db_success = load_db(possible_path)
+					if db_success:
+						break
+				
+
+func switch_state(new: State):
+	var old = current_state
+	if old == new:
+		return
+
+	current_state = new
+	emit_signal("state_changed", old, new)
+	#signal state_changed(old, new)
+
+func load_db(path: String):
+	db.path = path
+	var success = db.open_db()
+	if success:
+		config.set_value("general", "db_path", path)
+		config.save(config_path)
+		switch_state(State.LOADED)
+	else:
+		db.path = ""
+		switch_state(State.UNLOADED)
+
+func goto_scene(path):
+	call_deferred("_deferred_goto_scene", path)
+
+func _deferred_goto_scene(path):
+	# It is now safe to remove the current scene.
+	current_scene.free()
+
+	# Load the new scene.
+	var s = ResourceLoader.load(path)
+
+	# Instance the new scene.
+	current_scene = s.instantiate()
+
+	# Add it to the active scene, as child of root.
+	get_tree().root.add_child(current_scene)
+
+	# Optionally, to make it compatible with the SceneTree.change_scene_to_file() API.
+	get_tree().current_scene = current_scene