Add version to block script data

Use the plugin version for the block script data version. In development
since the plugin version is obtained from git tag, use "develpment" as
version.

This doesn't implement the migration itself.

https://phabricator.endlessm.com/T35547

Author: manuq

addons/block_code/block_code_plugin.gd

@@ -44,13 +44,20 @@ const DISABLED_CLASSES := [
 ]
 
 
+func _get_version():
+	var version: String = get_plugin_version()
+	if version.match("$*$"):
+		return "development"
+	return version
+
+
 func _enter_tree():
 	Types.init_cast_graph()
 
 	editor_inspector = EditorInterface.get_inspector()
 
 	main_panel = MainPanel.instantiate()
-	main_panel.undo_redo = get_undo_redo()
+	main_panel.setup(_get_version(), get_undo_redo())
 
 	# Add the main panel to the editor's main viewport.
 	EditorInterface.get_editor_main_screen().add_child(main_panel)

addons/block_code/block_script_data/block_script_data.gd

@@ -4,9 +4,11 @@ extends Resource
 @export var script_inherits: String
 @export var block_trees: SerializedBlockTreeNodeArray
 @export var generated_script: String
+@export var version: String
 
 
-func _init(p_script_inherits: String = "", p_block_trees: SerializedBlockTreeNodeArray = null, p_generated_script: String = ""):
+func _init(p_script_inherits: String = "", p_block_trees: SerializedBlockTreeNodeArray = null, p_generated_script: String = "", p_version: String = ""):
 	script_inherits = p_script_inherits
 	block_trees = p_block_trees
 	generated_script = p_generated_script
+	version = p_version

addons/block_code/ui/main_panel.gd

@@ -18,6 +18,7 @@ var _scene_root: Node
 var _block_code_nodes: Array
 var _collapsed: bool = false
 
+var plugin_version: String
 var undo_redo: EditorUndoRedoManager
 
 
@@ -33,6 +34,11 @@ func _ready():
 	_collapse_button.icon = _icon_collapse
 
 
+func setup(p_plugin_version: String, p_undo_redo: EditorUndoRedoManager):
+	plugin_version = p_plugin_version
+	undo_redo = p_undo_redo
+
+
 func _on_undo_redo_version_changed():
 	if _current_block_code_node == null:
 		return
@@ -47,6 +53,16 @@ func _on_button_pressed():
 	_print_generated_script()
 
 
+func _try_migration():
+	var script_version = _current_block_code_node.block_script.version
+	if script_version == plugin_version:
+		# No migration needed.
+		return
+	if script_version.is_empty():
+		script_version = "none"
+	push_warning("Migration not implemented from %s to %s" % [script_version, plugin_version])
+
+
 func switch_scene(scene_root: Node):
 	_title_bar.scene_selected(scene_root)
 
@@ -58,6 +74,7 @@ func switch_script(block_code_node: BlockCode):
 	_title_bar.bsd_selected(block_script)
 	_block_canvas.bsd_selected(block_script)
 	if block_code_node:
+		_try_migration()
 		EditorInterface.set_main_screen_editor("Block Code")
 
 
@@ -76,6 +93,7 @@ func save_script():
 	var generated_script = _block_canvas.generate_script_from_current_window(block_script.script_inherits)
 	block_script.block_trees = block_trees
 	block_script.generated_script = generated_script
+	block_script.version = plugin_version
 
 	undo_redo.add_do_property(_current_block_code_node.block_script, "block_trees", block_trees)
 	undo_redo.add_do_property(_current_block_code_node.block_script, "generated_script", generated_script)