Adding autosave functionality

addons/save_load_system/autoloads/save_game_manager.gd

@@ -9,6 +9,8 @@ extends Node
 
 signal apply_complete
 signal apply_save ## Apply the loaded data to the tree. Note: This should happen AFTER load_save()
+signal autosave_start ## Autosave has started
+signal autosave_complete ## Autosave has completed
 signal create_auto_save
 signal create_save(save_name: String)
 signal delete_save(filename: String)
@@ -156,6 +158,32 @@ func _load_save_settings() -> bool:
 
 	return true
 
+## Increment autosave numbers and if we've reach max number of autosaves, remove the oldest one
+func _move_autosaves() -> void:
+	var saves_dir = DirAccess.open(_save_game_settings.save_game_data_path)
+	if saves_dir == null:
+		DirAccess.make_dir_absolute(_save_game_settings.save_game_data_path)
+
+	var autosaves: Array[String] = []
+	for filename in saves_dir.get_files():
+		if !filename.begins_with(_save_game_settings.autosave_file_name_prepend): continue
+		if !filename.ends_with(".tres"): continue
+		autosaves.append(filename)
+
+	if autosaves.size() == _save_game_settings.max_auto_saves: # Delete oldest save
+		DirAccess.remove_absolute(_save_game_settings.save_game_data_path + autosaves.pop_back())
+
+	var filepath: String = _save_game_settings.save_game_data_path + _save_game_settings.autosave_file_name_prepend
+	for index in range(autosaves.size(), 0, -1):
+		var old_save_path: String = "%s%02d.tres" % [filepath, index]
+		var old_screenshot_path: String = "%s%02d.png" % [filepath, index]
+		var new_save_path: String = "%s%02d.tres" % [filepath, index + 1]
+		var new_screenshot_path: String = "%s%02d.png" % [filepath, index + 1]
+		DirAccess.copy_absolute(old_save_path, new_save_path)
+
+		if FileAccess.file_exists(old_screenshot_path):
+			DirAccess.copy_absolute(old_screenshot_path, new_screenshot_path)
+
 func _save_game_as_resource(save_name, resource_filename: String) -> void:
 	if not _load_save_settings(): return
 
@@ -200,6 +228,18 @@ func _on_apply_save() -> void:
 
 	apply_complete.emit()
 
+func _on_autosave_timer_timeout() -> void:
+	if not _load_save_settings(): return
+
+	autosave_start.emit()
+
+	_move_autosaves()
+
+	var autosave_filename: String = _save_game_settings.autosave_file_name_prepend + "01.tres"
+	_save_game_as_resource("Auto Save", autosave_filename)
+
+	autosave_complete.emit()
+
 ## Delete both the save file and the related screenshot
 func _on_delete_save(filename: String) -> void:
 	if filename.length() < 1:
@@ -233,10 +273,6 @@ func _on_save_game_as_resource(save_name: String) -> void:
 	_save_game_as_resource(save_name, _filename)
 	save_complete.emit()
 
-func _on_toggle_save_icon_generation(toggled: bool) -> void:
-	_enable_save_icon_generation = toggled
-
-
 func _on_start_autosave() -> void:
 	if _save_game_settings == null: _load_save_settings()
 
@@ -254,3 +290,6 @@ func _on_stop_autosave() -> void:
 	var autosave_timer: Timer = get_node_or_null("AutosaveTimer")
 	if autosave_timer == null: return
 	autosave_timer.stop()
+
+func _on_toggle_save_icon_generation(toggled: bool) -> void:
+	_enable_save_icon_generation = toggled

addons/save_load_system/resources/save_game_settings_resource.tres

@@ -7,6 +7,7 @@
 script = ExtResource("1_o1tpj")
 save_game_data_path = "user://game_data/"
 max_auto_saves = 5
+autosave_duration = 5
 save_file_name_prepend = "save_"
 quicksave_file_name_prepend = "quicksave_"
 autosave_file_name_prepend = "autosave_"