save/load current game

src/Main.gd

@@ -3,8 +3,56 @@ extends Control
 onready var taquin = $HSplitContainer/Taquin
 
 func _ready():
+	load_game()
 	print("Starting state: ", taquin.current_state_name())
 
+func _notification(what):
+	if what == MainLoop.NOTIFICATION_WM_QUIT_REQUEST:
+		save_game()
+		get_tree().quit() # default behavior
+
+# https://docs.godotengine.org/en/3.2/tutorials/io/saving_games.html
+func save_game():
+	var save_game = File.new()
+	save_game.open("user://savegame.save", File.WRITE)
+	var save_nodes = get_tree().get_nodes_in_group("Persist")
+	for node in save_nodes:
+		# Check the node has a save function
+		if !node.has_method("save"):
+			print("persistent node '%s' is missing a save() function, skipped" % node.name)
+			continue
+
+		# Call the node's save function
+		var node_data = node.call("save")
+		
+		# Augment data with origin
+		node_data["path"] = node.get_path()
+
+		# Store the save dictionary as a new line in the save file
+		save_game.store_line(to_json(node_data))
+	save_game.close()
+
+func load_game():
+	var save_game = File.new()
+	if not save_game.file_exists("user://savegame.save"):
+		return # Error! We don't have a save to load.
+
+	# Load the file line by line and process that dictionary to restore
+	# the object it represents.
+	save_game.open("user://savegame.save", File.READ)
+	while save_game.get_position() < save_game.get_len():
+		# Get the saved dictionary from the next line in the save file
+		var node_data = parse_json(save_game.get_line())
+
+		# Call the node's save function
+		var node = get_node(node_data["path"])
+		node.call("load", node_data)
+
+	save_game.close()
+
+#
+# Signals
+#
 func _on_Taquin_state_changed(previous, new):
 	print("Taquin state: ", Taquin.State.keys()[previous], " -> ", Taquin.State.keys()[new])
 	match new: