Fix forbidden comparisons between Ref and nullptr.

Necessary when compiling with strict_checks=yes.

Due to upstream change:

	df29cc696f

.github/workflows/all_builds.yml

@@ -5,7 +5,7 @@ on:
       godot-ref:
         description: A tag, branch or commit hash in the Godot repository.
         type: string
-        default: 4.3
+        default: 4.3-stable
       limboai-ref:
         description: A tag, branch or commit hash in the LimboAI repository.
         type: string

blackboard/blackboard_plan.cpp

@@ -13,9 +13,20 @@
 
 #include "../util/limbo_utility.h"
 
+#ifdef LIMBOAI_MODULE
+#include "editor/editor_inspector.h"
+#include "editor/editor_interface.h"
+#elif LIMBOAI_GDEXTENSION
+#include <godot_cpp/classes/editor_inspector.hpp>
+#include <godot_cpp/classes/editor_interface.hpp>
+#include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/classes/scene_tree.hpp>
+#endif
+
 bool BlackboardPlan::_set(const StringName &p_name, const Variant &p_value) {
 	String name_str = p_name;
 
+#ifdef TOOLS_ENABLED
 	// * Editor
 	if (var_map.has(p_name)) {
 		BBVariable &var = var_map[p_name];
@@ -26,29 +37,51 @@ bool BlackboardPlan::_set(const StringName &p_name, const Variant &p_value) {
 		}
 		return true;
 	}
+#endif // TOOLS_ENABLED
 
 	// * Mapping
 	if (name_str.begins_with("mapping/")) {
 		StringName mapped_var_name = name_str.get_slicec('/', 1);
 		StringName value = p_value;
-		bool properties_changed = false;
+		bool prop_list_changed = false;
 		if (value == StringName()) {
 			if (parent_scope_mapping.has(mapped_var_name)) {
-				properties_changed = true;
+				prop_list_changed = true;
 				parent_scope_mapping.erase(mapped_var_name);
 			}
 		} else {
 			if (!parent_scope_mapping.has(mapped_var_name)) {
-				properties_changed = true;
+				prop_list_changed = true;
 			}
 			parent_scope_mapping[mapped_var_name] = value;
 		}
-		if (properties_changed) {
+		if (prop_list_changed) {
 			notify_property_list_changed();
 		}
 		return true;
 	}
 
+	// * Binding
+	if (name_str.begins_with("binding/")) {
+		StringName bound_var = name_str.get_slicec('/', 1);
+		NodePath value = p_value;
+		bool prop_list_changed = false;
+		if (value.is_empty()) {
+			if (property_bindings.has(bound_var)) {
+				prop_list_changed = true;
+				property_bindings.erase(bound_var);
+			}
+		} else {
+			if (!property_bindings.has(bound_var)) {
+				prop_list_changed = true;
+			}
+			property_bindings[bound_var] = value;
+		}
+		if (prop_list_changed) {
+			notify_property_list_changed();
+		}
+	}
+
 	// * Storage
 	if (name_str.begins_with("var/")) {
 		StringName var_name = name_str.get_slicec('/', 1);
@@ -66,6 +99,8 @@ bool BlackboardPlan::_set(const StringName &p_name, const Variant &p_value) {
 			var_map[var_name].set_hint((PropertyHint)(int)p_value);
 		} else if (what == "hint_string") {
 			var_map[var_name].set_hint_string(p_value);
+		} else if (what == "property_binding") {
+			property_bindings[var_name] = NodePath(p_value);
 		} else {
 			return false;
 		}
@@ -78,28 +113,64 @@ bool BlackboardPlan::_set(const StringName &p_name, const Variant &p_value) {
 bool BlackboardPlan::_get(const StringName &p_name, Variant &r_ret) const {
 	String name_str = p_name;
 
+#ifdef TOOLS_ENABLED
 	// * Editor
 	if (var_map.has(p_name)) {
 		if (has_mapping(p_name)) {
 			r_ret = "Mapped to " + LimboUtility::get_singleton()->decorate_var(parent_scope_mapping[p_name]);
+		} else if (has_property_binding(p_name)) {
+			const NodePath &binding = property_bindings[p_name];
+
+			Node *edited_node = Object::cast_to<Node>(EditorInterface::get_singleton()->get_inspector()->get_edited_object());
+			if (!edited_node) {
+				edited_node = SCENE_TREE()->get_edited_scene_root();
+			}
+			Node *bound_node = edited_node ? edited_node->get_node_or_null(binding) : nullptr;
+
+			String shortened_path;
+			if (bound_node) {
+				shortened_path = (String)bound_node->get_name() +
+						":" + (String)binding.get_concatenated_subnames();
+			} else {
+				shortened_path = (String)binding.get_name(binding.get_name_count() - 1) +
+						":" + (String)binding.get_concatenated_subnames();
+			}
+			r_ret = String::utf8("🔗 ") + shortened_path;
 		} else {
 			r_ret = var_map[p_name].get_value();
 		}
 		return true;
 	}
+#endif // TOOLS_ENABLED
 
 	// * Mapping
 	if (name_str.begins_with("mapping/")) {
 		StringName mapped_var_name = name_str.get_slicec('/', 1);
 		ERR_FAIL_COND_V(mapped_var_name == StringName(), false);
-		if (parent_scope_mapping.has(mapped_var_name)) {
+		if (has_mapping(mapped_var_name)) {
 			r_ret = parent_scope_mapping[mapped_var_name];
+		} else if (has_property_binding(mapped_var_name)) {
+			r_ret = RTR("Already bound to property.");
 		} else {
 			r_ret = StringName();
 		}
 		return true;
 	}
 
+	// * Binding
+	if (name_str.begins_with("binding/")) {
+		StringName bound_var = name_str.get_slicec('/', 1);
+		ERR_FAIL_COND_V(bound_var == StringName(), false);
+		if (has_property_binding(bound_var)) {
+			r_ret = property_bindings[bound_var];
+		} else if (has_mapping(bound_var)) {
+			r_ret = RTR("Already mapped to variable.");
+		} else {
+			r_ret = NodePath();
+		}
+		return true;
+	}
+
 	// * Storage
 	if (!name_str.begins_with("var/")) {
 		return false;
@@ -127,14 +198,16 @@ void BlackboardPlan::_get_property_list(List<PropertyInfo> *p_list) const {
 		String var_name = p.first;
 		BBVariable var = p.second;
 
+#ifdef TOOLS_ENABLED
 		// * Editor
-		if (var.get_type() != Variant::NIL && (!is_derived() || !var_name.begins_with("_"))) {
+		if (!_is_var_hidden(var_name, var)) {
-			if (has_mapping(var_name)) {
+			if (has_mapping(var_name) || has_property_binding(var_name)) {
 				p_list->push_back(PropertyInfo(Variant::STRING, var_name, PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_READ_ONLY));
 			} else {
 				p_list->push_back(PropertyInfo(var.get_type(), var_name, var.get_hint(), var.get_hint_string(), PROPERTY_USAGE_EDITOR));
 			}
 		}
+#endif // TOOLS_ENABLED
 
 		// * Storage
 		if (is_derived() && (!var.is_value_changed() || var.get_value() == base->var_map[var_name].get_value())) {
@@ -153,6 +226,12 @@ void BlackboardPlan::_get_property_list(List<PropertyInfo> *p_list) const {
 	if (is_mapping_enabled()) {
 		p_list->push_back(PropertyInfo(Variant::NIL, "Mapping", PROPERTY_HINT_NONE, "mapping/", PROPERTY_USAGE_GROUP));
 		for (const Pair<StringName, BBVariable> &p : var_list) {
+			if (_is_var_hidden(p.first, p.second)) {
+				continue;
+			}
+			if (unlikely(has_property_binding(p.first))) {
+				p_list->push_back(PropertyInfo(Variant::STRING, "mapping/" + p.first, PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_READ_ONLY));
+			} else {
 				// Serialize only non-empty mappings.
 				PropertyUsageFlags usage = has_mapping(p.first) ? PROPERTY_USAGE_DEFAULT : PROPERTY_USAGE_EDITOR;
 				p_list->push_back(PropertyInfo(Variant::STRING_NAME, "mapping/" + p.first, PROPERTY_HINT_NONE, "", usage));
@@ -160,6 +239,23 @@ void BlackboardPlan::_get_property_list(List<PropertyInfo> *p_list) const {
 		}
 	}
 
+	// * Binding
+	p_list->push_back(PropertyInfo(Variant::NIL, "Binding", PROPERTY_HINT_NONE, "binding/", PROPERTY_USAGE_GROUP));
+	for (const Pair<StringName, BBVariable> &p : var_list) {
+		if (_is_var_hidden(p.first, p.second)) {
+			continue;
+		}
+		if (unlikely(has_mapping(p.first))) {
+			p_list->push_back(PropertyInfo(Variant::STRING, "binding/" + p.first, PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_READ_ONLY));
+		} else {
+			PropertyUsageFlags usage = has_property_binding(p.first) ? PROPERTY_USAGE_DEFAULT : PROPERTY_USAGE_EDITOR;
+			// PROPERTY_HINT_LINK is used to signal that NodePath should point to a property.
+			// Our inspector plugin will know how to handle it.
+			p_list->push_back(PropertyInfo(Variant::NODE_PATH, "binding/" + p.first, PROPERTY_HINT_LINK, itos(p.second.get_type()), usage));
+		}
+	}
+}
+
 bool BlackboardPlan::_property_can_revert(const StringName &p_name) const {
 	if (String(p_name).begins_with("mapping/")) {
 		return true;
@@ -199,6 +295,11 @@ bool BlackboardPlan::has_mapping(const StringName &p_name) const {
 	return is_mapping_enabled() && parent_scope_mapping.has(p_name) && parent_scope_mapping[p_name] != StringName();
 }
 
+void BlackboardPlan::set_property_binding(const StringName &p_name, const NodePath &p_path) {
+	property_bindings[p_name] = p_path;
+	emit_changed();
+}
+
 void BlackboardPlan::set_prefetch_nodepath_vars(bool p_enable) {
 	prefetch_nodepath_vars = p_enable;
 	emit_changed();
@@ -410,8 +511,9 @@ void BlackboardPlan::populate_blackboard(const Ref<Blackboard> &p_blackboard, bo
 #endif
 			continue;
 		}
+		bool is_bound = has_property_binding(p.first) || (is_derived() && get_base_plan()->has_property_binding(p.first));
 		bool has_mapping = parent_scope_mapping.has(p.first);
-		bool do_prefetch = !has_mapping && prefetch_nodepath_vars;
+		bool do_prefetch = !is_bound && !has_mapping && prefetch_nodepath_vars;
 
 		// Add a variable duplicate to the blackboard, optionally with NodePath prefetch.
 		BBVariable var = p.second.duplicate(true);
@@ -433,6 +535,24 @@ void BlackboardPlan::populate_blackboard(const Ref<Blackboard> &p_blackboard, bo
 				ERR_CONTINUE_MSG(p_blackboard->get_parent().is_null(), vformat("BlackboardPlan: Cannot link variable %s to parent scope because the parent scope is not set.", LimboUtility::get_singleton()->decorate_var(p.first)));
 				p_blackboard->link_var(p.first, p_blackboard->get_parent(), target_var);
 			}
+		} else if (is_bound) {
+			// Bind variable to a property of a scene node.
+			NodePath binding_path;
+			Node *binding_root;
+			if (has_property_binding(p.first)) {
+				binding_path = property_bindings[p.first];
+				binding_root = p_prefetch_root;
+			} else {
+				binding_path = get_base_plan()->property_bindings[p.first];
+				binding_root = p_prefetch_root_for_base_plan;
+			}
+			ERR_CONTINUE_MSG(binding_path.get_subname_count() != 1, vformat("BlackboardPlan: Can't bind variable %s using property path that contains multiple sub-names: %s", LimboUtility::get_singleton()->decorate_var(p.first), binding_path));
+			NodePath node_path{ binding_path.get_concatenated_names() };
+			StringName prop_name = binding_path.get_subname(0);
+			// TODO: Implement binding for base plan as well.
+			Node *n = binding_root->get_node_or_null(node_path);
+			ERR_CONTINUE_MSG(n == nullptr, vformat("BlackboardPlan: Binding failed for variable %s using property path: %s", LimboUtility::get_singleton()->decorate_var(p.first), binding_path));
+			var.bind(n, prop_name);
 		}
 	}
 }

blackboard/blackboard_plan.h

@@ -34,18 +34,25 @@ private:
 	// When base is not null, the plan is considered to be derived from the base plan.
 	// A derived plan can only have variables that exist in the base plan,
 	// and only the values can be different in those variables.
+	// The derived plan is synced with the base plan to maintain consistency.
 	Ref<BlackboardPlan> base;
 
 	// Mapping between variables in this plan and their parent scope names.
 	// Used for linking variables to their parent scope counterparts upon Blackboard creation/population.
 	HashMap<StringName, StringName> parent_scope_mapping;
-	// Fetcher function for the parent scope plan. Funtion should return a Ref<BlackboardPlan>.
+	// Fetcher function for the parent scope plan. Function should return a Ref<BlackboardPlan>.
-	// Used in the inspector. When set, mapping feature becomes available.
+	// Used in the inspector: enables mapping feature when set.
 	Callable parent_scope_plan_provider;
 
+	// Bindings to properties in the scene to which this plan belongs.
+	HashMap<StringName, NodePath> property_bindings;
+	bool property_binding_enabled = false;
+
 	// If true, NodePath variables will be prefetched, so that the vars will contain node pointers instead (upon BB creation/population).
 	bool prefetch_nodepath_vars = true;
 
+	_FORCE_INLINE_ bool _is_var_hidden(const String &p_name, const BBVariable &p_var) const { return p_var.get_type() == Variant::NIL || (is_derived() && p_name.begins_with("_")); }
+
 protected:
 	static void _bind_methods();
 
@@ -69,6 +76,10 @@ public:
 	bool is_mapping_enabled() const { return parent_scope_plan_provider.is_valid() && (parent_scope_plan_provider.call() != Ref<BlackboardPlan>()); }
 	bool has_mapping(const StringName &p_name) const;
 
+	bool has_property_binding(const StringName &p_name) const { return property_bindings.has(p_name); }
+	void set_property_binding(const StringName &p_name, const NodePath &p_path);
+	NodePath get_property_binding(const StringName &p_name) const { return property_bindings.has(p_name) ? property_bindings[p_name] : NodePath(); }
+
 	void set_prefetch_nodepath_vars(bool p_enable);
 	bool is_prefetching_nodepath_vars() const;
 

doc/source/classes/class_limbostate.rst

@@ -234,7 +234,7 @@ Called when the state is entered.
 
 |void| **_exit**\ (\ ) |virtual| :ref:`🔗<class_LimboState_private_method__exit>`
 
-Called when the state is exited.
+Called when the state is exited. This happens on a transition to another state, and when the state machine is removed from the scene tree (e.g., when the node is freed with :ref:`Node.queue_free<class_Node_method_queue_free>` or the scene changes). Due to implementation details, :ref:`_exit<class_LimboState_private_method__exit>` will not be called on :ref:`Object.free<class_Object_method_free>`!
 
 .. rst-class:: classref-item-separator
 

doc_classes/LimboState.xml

@@ -20,7 +20,7 @@
 		<method name="_exit" qualifiers="virtual">
 			<return type="void" />
 			<description>
-				Called when the state is exited.
+				Called when the state is exited. This happens on a transition to another state, and when the state machine is removed from the scene tree (e.g., when the node is freed with [method Node.queue_free] or the scene changes). Due to implementation details, [method _exit] will not be called on [method Object.free]!
 			</description>
 		</method>
 		<method name="_setup" qualifiers="virtual">

editor/editor_property_property_path.cpp

@@ -0,0 +1,238 @@
+/**
+ * editor_property_path.cpp
+ * =============================================================================
+ * Copyright 2021-2024 Serhii Snitsaruk
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ * =============================================================================
+ */
+
+#include "editor_property_property_path.h"
+
+#include "../util/limbo_compat.h"
+#include "../util/limbo_string_names.h"
+
+#ifdef LIMBOAI_MODULE
+#include "editor/editor_data.h"
+#include "editor/editor_interface.h"
+#include "servers/display_server.h"
+#endif
+
+#ifdef LIMBOAI_GDEXTENSION
+#include <godot_cpp/classes/display_server.hpp>
+#include <godot_cpp/classes/editor_inspector.hpp>
+#include <godot_cpp/classes/editor_interface.hpp>
+#include <godot_cpp/classes/editor_selection.hpp>
+#include <godot_cpp/classes/h_box_container.hpp>
+#include <godot_cpp/classes/popup_menu.hpp>
+#include <godot_cpp/classes/scene_tree.hpp>
+#endif // LIMBOAI_MODULE
+
+#ifdef TOOLS_ENABLED
+
+namespace {
+
+Node *_get_base_node(Object *p_edited_object, SceneTree *p_scene_tree) {
+	Node *base_node = Object::cast_to<Node>(p_edited_object);
+	if (!base_node) {
+		base_node = Object::cast_to<Node>(EditorInterface::get_singleton()->get_inspector()->get_edited_object());
+	}
+	if (!base_node) {
+		base_node = p_scene_tree->get_edited_scene_root();
+	}
+	return base_node;
+}
+
+} // unnamed namespace
+
+Node *EditorPropertyPropertyPath::_get_selected_node() {
+	ERR_FAIL_NULL_V(get_edited_object(), nullptr);
+
+	NodePath path = get_edited_object()->get(get_edited_property());
+	if (path.is_empty()) {
+		return nullptr;
+	}
+
+	Node *base_node = _get_base_node(get_edited_object(), get_tree());
+	ERR_FAIL_NULL_V(base_node, nullptr);
+	Node *selected_node = base_node->get_node_or_null(path);
+	return selected_node;
+}
+
+void EditorPropertyPropertyPath::_action_selected(int p_idx) {
+	switch (p_idx) {
+		case ACTION_CLEAR: {
+			emit_changed(get_edited_property(), NodePath());
+		} break;
+		case ACTION_COPY: {
+			DisplayServer::get_singleton()->clipboard_set(get_edited_object()->get(get_edited_property()));
+		} break;
+		case ACTION_EDIT: {
+			assign_button->hide();
+			action_menu->hide();
+			path_edit->show();
+			path_edit->set_text(get_edited_object()->get(get_edited_property()));
+			path_edit->grab_focus();
+		} break;
+		case ACTION_SELECT: {
+			Node *selected_node = _get_selected_node();
+			if (selected_node) {
+				EditorInterface::get_singleton()->get_selection()->clear();
+				EditorInterface::get_singleton()->get_selection()->add_node(selected_node);
+			}
+		} break;
+	}
+}
+
+void EditorPropertyPropertyPath::_accept_text() {
+	path_edit->hide();
+	assign_button->show();
+	action_menu->show();
+	emit_changed(get_edited_property(), path_edit->get_text());
+}
+
+void EditorPropertyPropertyPath::_property_selected(const NodePath &p_property_path, const NodePath &p_node_path) {
+	if (p_property_path.is_empty()) {
+		return;
+	}
+	Node *base_node = _get_base_node(get_edited_object(), get_tree());
+	ERR_FAIL_NULL(base_node);
+	Node *selected_node = get_tree()->get_edited_scene_root()->get_node_or_null(p_node_path);
+	ERR_FAIL_NULL(selected_node);
+	NodePath path = String(base_node->get_path_to(selected_node)) + String(p_property_path);
+
+	emit_changed(get_edited_property(), path);
+	update_property();
+}
+
+void EditorPropertyPropertyPath::_node_selected(const NodePath &p_path) {
+	if (p_path.is_empty()) {
+		return;
+	}
+	Node *selected_node = get_tree()->get_edited_scene_root()->get_node_or_null(p_path);
+	ERR_FAIL_NULL(selected_node);
+	EditorInterface::get_singleton()->popup_property_selector(
+			selected_node,
+			callable_mp(this, &EditorPropertyPropertyPath::_property_selected).bind(p_path),
+			valid_types);
+}
+
+void EditorPropertyPropertyPath::_choose_property() {
+	EditorInterface::get_singleton()->popup_node_selector(callable_mp(this, &EditorPropertyPropertyPath::_node_selected));
+}
+
+void EditorPropertyPropertyPath::_set_read_only(bool p_read_only) {
+	assign_button->set_disabled(p_read_only);
+	action_menu->set_disabled(p_read_only);
+}
+
+#ifdef LIMBOAI_MODULE
+void EditorPropertyPropertyPath::update_property() {
+#elif LIMBOAI_GDEXTENSION
+void EditorPropertyPropertyPath::_update_property() {
+#endif
+	NodePath path = get_edited_object()->get(get_edited_property());
+	if (path.is_empty()) {
+		assign_button->set_text(TTR("Bind..."));
+	} else {
+		Node *base_node = _get_base_node(get_edited_object(), get_tree());
+		ERR_FAIL_NULL(base_node);
+		Node *selected_node = base_node->get_node_or_null(path);
+		String text;
+		if (selected_node) {
+			text = (String)selected_node->get_name() +
+					":" + (String)path.get_concatenated_subnames();
+		} else {
+			text = (String)path;
+		}
+		assign_button->set_text(text);
+		assign_button->set_tooltip_text(path);
+	}
+}
+
+void EditorPropertyPropertyPath::_notification(int p_what) {
+	switch (p_what) {
+		case NOTIFICATION_ENTER_TREE:
+		case NOTIFICATION_THEME_CHANGED: {
+			action_menu->set_button_icon(get_theme_icon(LW_NAME(GuiTabMenuHl), LW_NAME(EditorIcons)));
+			action_menu->get_popup()->set_item_icon(ACTION_CLEAR, get_theme_icon(LW_NAME(Clear), LW_NAME(EditorIcons)));
+			action_menu->get_popup()->set_item_icon(ACTION_COPY, get_theme_icon(LW_NAME(ActionCopy), LW_NAME(EditorIcons)));
+			action_menu->get_popup()->set_item_icon(ACTION_EDIT, get_theme_icon(LW_NAME(Edit), LW_NAME(EditorIcons)));
+			action_menu->get_popup()->set_item_icon(ACTION_SELECT, get_theme_icon(LW_NAME(ExternalLink), LW_NAME(EditorIcons)));
+		} break;
+	}
+}
+
+void EditorPropertyPropertyPath::setup(const PackedInt32Array &p_valid_types) {
+	valid_types = p_valid_types;
+}
+
+EditorPropertyPropertyPath::EditorPropertyPropertyPath() {
+	HBoxContainer *hb = memnew(HBoxContainer);
+	add_child(hb);
+	hb->add_theme_constant_override(LW_NAME(separation), 0);
+
+	assign_button = memnew(Button);
+	hb->add_child(assign_button);
+	assign_button->set_flat(true);
+	assign_button->set_text(TTR("Bind..."));
+	assign_button->set_clip_text(true);
+	assign_button->set_h_size_flags(SIZE_EXPAND_FILL);
+	assign_button->set_auto_translate_mode(AUTO_TRANSLATE_MODE_DISABLED);
+	assign_button->connect(LW_NAME(pressed), callable_mp(this, &EditorPropertyPropertyPath::_choose_property));
+
+	path_edit = memnew(LineEdit);
+	hb->add_child(path_edit);
+	path_edit->set_h_size_flags(SIZE_EXPAND_FILL);
+	path_edit->connect(LW_NAME(focus_exited), callable_mp(this, &EditorPropertyPropertyPath::_accept_text));
+	path_edit->connect(LW_NAME(text_submitted), callable_mp(this, &EditorPropertyPropertyPath::_accept_text).unbind(1));
+	path_edit->hide();
+
+	action_menu = memnew(MenuButton);
+	action_menu->get_popup()->add_item(TTR("Clear"), ACTION_CLEAR);
+	action_menu->get_popup()->add_item(TTR("Copy as Text"), ACTION_COPY);
+	action_menu->get_popup()->add_item(TTR("Edit"), ACTION_EDIT);
+	action_menu->get_popup()->add_item(TTR("Show Node in Tree"), ACTION_SELECT);
+	action_menu->get_popup()->connect(LW_NAME(id_pressed), callable_mp(this, &EditorPropertyPropertyPath::_action_selected));
+	hb->add_child(action_menu);
+}
+
+//***** EditorInspectorPluginPropertyPath
+
+#ifdef LIMBOAI_MODULE
+bool EditorInspectorPluginPropertyPath::can_handle(Object *p_object) {
+#elif LIMBOAI_GDEXTENSION
+bool EditorInspectorPluginPropertyPath::_can_handle(Object *p_object) const {
+#endif
+	return true;
+}
+
+#ifdef LIMBOAI_MODULE
+bool EditorInspectorPluginPropertyPath::parse_property(Object *p_object, const Variant::Type p_type, const String &p_path, const PropertyHint p_hint, const String &p_hint_text, const BitField<PropertyUsageFlags> p_usage, const bool p_wide) {
+#elif LIMBOAI_GDEXTENSION
+bool EditorInspectorPluginPropertyPath::_parse_property(Object *p_object, const Variant::Type p_type, const String &p_path, const PropertyHint p_hint, const String &p_hint_text, const BitField<PropertyUsageFlags> p_usage, const bool p_wide) {
+#endif
+	if (p_type != Variant::NODE_PATH || p_hint != PROPERTY_HINT_LINK) {
+		return false;
+	}
+
+	EditorPropertyPropertyPath *ed = memnew(EditorPropertyPropertyPath);
+
+	// Convert the hint text to an array of valid types.
+	PackedInt32Array valid_types;
+	PackedStringArray type_specifiers = p_hint_text.split(",");
+	for (const String &t : type_specifiers) {
+		if (t.is_valid_int()) {
+			valid_types.append(t.to_int());
+		}
+	}
+	ed->setup(valid_types);
+
+	add_property_editor(p_path, ed);
+
+	return true;
+}
+
+#endif // TOOLS_ENABLED

editor/editor_property_property_path.h

@@ -0,0 +1,98 @@
+/**
+ * editor_property_path.h
+ * =============================================================================
+ * Copyright 2021-2024 Serhii Snitsaruk
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ * =============================================================================
+ */
+
+#ifndef EDITOR_PROPERTY_PROPERTY_PATH
+#define EDITOR_PROPERTY_PROPERTY_PATH
+
+#ifdef TOOLS_ENABLED
+
+#ifdef LIMBOAI_MODULE
+#include "editor/editor_inspector.h"
+#include "scene/gui/line_edit.h"
+#include "scene/gui/menu_button.h"
+#endif // LIMBOAI_MODULE
+
+#ifdef LIMBOAI_GDEXTENSION
+#include <godot_cpp/classes/button.hpp>
+#include <godot_cpp/classes/editor_inspector_plugin.hpp>
+#include <godot_cpp/classes/editor_property.hpp>
+#include <godot_cpp/classes/line_edit.hpp>
+#include <godot_cpp/classes/menu_button.hpp>
+using namespace godot;
+#endif // LIMBOAI_GDEXTENSION
+
+// Specialized property editor for NodePath properties that represent a path to a specific property instead of just a node.
+// Handles NodePath properties that have PROPERTY_HINT_LINK.
+// Hint string can list the valid Variant types as comma-separated integers.
+class EditorPropertyPropertyPath : public EditorProperty {
+	GDCLASS(EditorPropertyPropertyPath, EditorProperty);
+
+private:
+	enum Action {
+		ACTION_CLEAR,
+		ACTION_COPY,
+		ACTION_EDIT,
+		ACTION_SELECT,
+	};
+
+	Button *assign_button;
+	MenuButton *action_menu;
+	LineEdit *path_edit;
+
+	PackedInt32Array valid_types;
+
+	Node *_get_selected_node();
+	void _action_selected(int p_idx);
+	void _accept_text();
+	void _property_selected(const NodePath &p_property_path, const NodePath &p_node_path);
+	void _node_selected(const NodePath &p_path);
+	void _choose_property();
+
+protected:
+	static void _bind_methods() {}
+	void _notification(int p_what);
+
+public:
+	// Note: Needs to be public in GDExtension.
+	virtual void _set_read_only(bool p_read_only) override;
+
+#ifdef LIMBOAI_MODULE
+	virtual void update_property() override;
+#elif LIMBOAI_GDEXTENSION
+	virtual void _update_property() override;
+#endif
+
+	void setup(const PackedInt32Array &p_valid_types);
+	EditorPropertyPropertyPath();
+};
+
+class EditorInspectorPluginPropertyPath : public EditorInspectorPlugin {
+	GDCLASS(EditorInspectorPluginPropertyPath, EditorInspectorPlugin);
+
+private:
+protected:
+	static void _bind_methods() {}
+
+public:
+#ifdef LIMBOAI_MODULE
+	virtual bool can_handle(Object *p_object) override;
+	virtual bool parse_property(Object *p_object, const Variant::Type p_type, const String &p_path, const PropertyHint p_hint, const String &p_hint_text, const BitField<PropertyUsageFlags> p_usage, const bool p_wide = false) override;
+#elif LIMBOAI_GDEXTENSION
+	virtual bool _can_handle(Object *p_object) const override;
+	virtual bool _parse_property(Object *p_object, const Variant::Type p_type, const String &p_path, const PropertyHint p_hint, const String &p_hint_text, const BitField<PropertyUsageFlags> p_usage, const bool p_wide = false) override;
+#endif
+
+	EditorInspectorPluginPropertyPath() = default;
+};
+
+#endif // TOOLS_ENABLED
+
+#endif // EDITOR_PROPERTY_PROPERTY_PATH

editor/editor_property_variable_name.cpp

@@ -245,6 +245,11 @@ bool EditorInspectorPluginVariableName::parse_property(Object *p_object, const V
 #elif LIMBOAI_GDEXTENSION
 bool EditorInspectorPluginVariableName::_parse_property(Object *p_object, const Variant::Type p_type, const String &p_path, const PropertyHint p_hint, const String &p_hint_text, const BitField<PropertyUsageFlags> p_usage, const bool p_wide) {
 #endif
+	if (p_usage & PROPERTY_USAGE_READ_ONLY) {
+		// Don't handle read-only properties using this plugin.
+		return false;
+	}
+
 	bool is_mapping = p_path.begins_with("mapping/");
 	if (!(p_type == Variant::Type::STRING_NAME || p_type == Variant::Type::STRING) || !(is_mapping || p_path.ends_with("_var") || p_path.ends_with("variable"))) {
 		return false;

editor/limbo_ai_editor_plugin.cpp

@@ -25,6 +25,7 @@
 #include "blackboard_plan_editor.h"
 #include "debugger/limbo_debugger_plugin.h"
 #include "editor_property_bb_param.h"
+#include "editor_property_property_path.h"
 
 #ifdef LIMBOAI_MODULE
 #include "core/config/project_settings.h"
@@ -66,6 +67,7 @@
 #include <godot_cpp/classes/ref_counted.hpp>
 #include <godot_cpp/classes/resource_loader.hpp>
 #include <godot_cpp/classes/resource_saver.hpp>
+#include <godot_cpp/classes/scene_tree.hpp>
 #include <godot_cpp/classes/script.hpp>
 #include <godot_cpp/classes/script_editor.hpp>
 #include <godot_cpp/classes/script_editor_base.hpp>
@@ -73,6 +75,21 @@
 #include <godot_cpp/core/error_macros.hpp>
 #endif // LIMBOAI_GDEXTENSION
 
+namespace {
+
+// If built-in resource - switch to the owner scene (open it if not already).
+inline void _switch_to_owner_scene_if_builtin(const Ref<BehaviorTree> &p_behavior_tree) {
+	if (p_behavior_tree.is_valid() && p_behavior_tree->get_path().contains("::")) {
+		String current_scene = SCENE_TREE()->get_edited_scene_root()->get_scene_file_path();
+		String scene_path = p_behavior_tree->get_path().get_slice("::", 0);
+		if (current_scene != scene_path) {
+			EditorInterface::get_singleton()->open_scene_from_path(scene_path);
+		}
+	}
+}
+
+} // unnamed namespace
+
 //**** LimboAIEditor
 
 _FORCE_INLINE_ String _get_script_template_path() {
@@ -97,7 +114,7 @@ void LimboAIEditor::_commit_action_with_update(EditorUndoRedoManager *p_undo_red
 	p_undo_redo->add_do_method(this, LW_NAME(_update_task_tree), task_tree->get_bt());
 	p_undo_redo->add_undo_method(this, LW_NAME(_update_task_tree), task_tree->get_bt());
 	p_undo_redo->commit_action();
-	_mark_as_dirty(true);
+	_set_as_dirty(task_tree->get_bt(), true);
 }
 
 void LimboAIEditor::_add_task(const Ref<BTTask> &p_task, bool p_as_sibling) {
@@ -201,20 +218,58 @@ void LimboAIEditor::_new_bt() {
 	EDIT_RESOURCE(bt);
 }
 
-void LimboAIEditor::_save_bt(String p_path) {
+void LimboAIEditor::_save_bt(const Ref<BehaviorTree> &p_bt, const String &p_path) {
-	ERR_FAIL_COND_MSG(p_path.is_empty(), "Empty p_path");
+	ERR_FAIL_COND(p_path.is_empty());
-	ERR_FAIL_COND_MSG(task_tree->get_bt().is_null(), "Behavior Tree is null.");
+	ERR_FAIL_COND(!p_path.begins_with("res://"));
+	ERR_FAIL_COND(p_bt.is_null());
+
+	if (p_bt->get_path() != p_path) {
 #ifdef LIMBOAI_MODULE
 		task_tree->get_bt()->set_path(p_path, true);
 #elif LIMBOAI_GDEXTENSION
 		task_tree->get_bt()->take_over_path(p_path);
 #endif
-	RESOURCE_SAVE(task_tree->get_bt(), p_path, ResourceSaver::FLAG_CHANGE_PATH);
-	_update_tabs();
-	_mark_as_dirty(false);
 	}
 
-void LimboAIEditor::_load_bt(String p_path) {
+	// This is a workaround, because EditorNode::save_resource() function is not accessible in GDExtension.
+	if (RESOURCE_IS_BUILT_IN(p_bt)) {
+		// If built-in resource - save the containing resource instead.
+		String file_path = p_path.get_slice("::", 0);
+		ERR_FAIL_COND_MSG(!RESOURCE_EXISTS(file_path, "Resource"), "LimboAI: SAVE FAILED - resource file doesn't exist: " + file_path);
+		if (RESOURCE_IS_SCENE_FILE(file_path)) {
+			// Packed scene - save the scene instead.
+			if (EditorInterface::get_singleton()->get_open_scenes().has(file_path)) {
+				// If scene is open, switch to it first, and then ask to save.
+				// This is needed because saving the currently edited scene can have complications.
+				EditorInterface::get_singleton()->open_scene_from_path(file_path);
+				EditorInterface::get_singleton()->save_scene();
+			} else {
+				// If scene is not currently open in the editor, load and resave it.
+				Ref<Resource> scene = RESOURCE_LOAD(file_path, "PackedScene");
+				RESOURCE_SAVE(scene, file_path, ResourceSaver::FLAG_NONE);
+			}
+		} else {
+			// Not a packed scene - save the containing resource to file.
+			Ref<Resource> res = RESOURCE_LOAD(file_path, "Resource");
+			RESOURCE_SAVE(res, file_path, ResourceSaver::FLAG_NONE);
+		}
+	} else {
+		// If external resource - save to file.
+		RESOURCE_SAVE(p_bt, p_path, ResourceSaver::FLAG_CHANGE_PATH);
+	}
+
+	_set_as_dirty(p_bt, false);
+	_update_tabs();
+}
+
+void LimboAIEditor::_save_current_bt(const String &p_path) {
+	ERR_FAIL_COND_MSG(p_path.is_empty(), "LimboAI: SAVE FAILED - p_path is empty");
+	ERR_FAIL_COND_MSG(task_tree->get_bt().is_null(), "LimboAI: SAVE FAILED - bt is null");
+
+	_save_bt(task_tree->get_bt(), p_path);
+}
+
+void LimboAIEditor::_load_bt(const String &p_path) {
 	ERR_FAIL_COND_MSG(p_path.is_empty(), "Empty p_path");
 	Ref<BehaviorTree> bt = RESOURCE_LOAD(p_path, "BehaviorTree");
 	ERR_FAIL_COND(!bt.is_valid());
@@ -253,6 +308,8 @@ void LimboAIEditor::_disable_editing() {
 void LimboAIEditor::edit_bt(const Ref<BehaviorTree> &p_behavior_tree, bool p_force_refresh) {
 	ERR_FAIL_COND_MSG(p_behavior_tree.is_null(), "p_behavior_tree is null");
 
+	_switch_to_owner_scene_if_builtin(p_behavior_tree);
+
 	if (!p_force_refresh && task_tree->get_bt() == p_behavior_tree) {
 		return;
 	}
@@ -268,8 +325,8 @@ void LimboAIEditor::edit_bt(const Ref<BehaviorTree> &p_behavior_tree, bool p_for
 
 	task_tree->load_bt(p_behavior_tree);
 
-	if (task_tree->get_bt().is_valid() && !task_tree->get_bt()->is_connected(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_mark_as_dirty))) {
+	if (task_tree->get_bt().is_valid() && !task_tree->get_bt()->is_connected(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_set_as_dirty))) {
-		task_tree->get_bt()->connect(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_mark_as_dirty).bind(true));
+		task_tree->get_bt()->connect(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_set_as_dirty).bind(task_tree->get_bt(), true));
 	}
 
 	int idx = history.find(p_behavior_tree);
@@ -334,12 +391,11 @@ void LimboAIEditor::get_window_layout(const Ref<ConfigFile> &p_configuration) {
 	p_configuration->set_value("LimboAI", "bteditor_hsplit", split_offset);
 }
 
-void LimboAIEditor::_mark_as_dirty(bool p_dirty) {
+void LimboAIEditor::_set_as_dirty(const Ref<BehaviorTree> &p_bt, bool p_dirty) {
-	Ref<BehaviorTree> bt = task_tree->get_bt();
+	if (p_dirty && !dirty.has(p_bt)) {
-	if (p_dirty && !dirty.has(bt)) {
+		dirty.insert(p_bt);
-		dirty.insert(bt);
+	} else if (p_dirty == false && dirty.has(p_bt)) {
-	} else if (p_dirty == false && dirty.has(bt)) {
+		dirty.erase(p_bt);
-		dirty.erase(bt);
 	}
 }
 
@@ -439,6 +495,14 @@ void LimboAIEditor::_process_shortcut_input(const Ref<InputEvent> &p_event) {
 		} else if (LW_IS_SHORTCUT("limbo_ai/close_tab", p_event)) {
 			_tab_menu_option_selected(TAB_CLOSE);
 			handled = true;
+		} else if (LW_IS_SHORTCUT("limbo_ai/editor_save_scene", p_event)) {
+			// This intercepts the editor save action, but does not set the event as handled because we don't know the user's intention.
+			// We just want to save the currently edited BT as well, which may cause a loop with built-in resource if done from "_save_external_data".
+			// Workaround for: https://github.com/limbonaut/limboai/issues/240#issuecomment-2453087424
+			if (task_tree->get_bt().is_valid() && RESOURCE_IS_BUILT_IN(task_tree->get_bt())) {
+				_on_save_pressed();
+			}
+			handled = false; // intentionally not set as handled
 		}
 	}
 
@@ -837,6 +901,7 @@ void LimboAIEditor::_on_tree_task_activated() {
 
 void LimboAIEditor::_on_visibility_changed() {
 	if (task_tree->is_visible_in_tree()) {
+		_switch_to_owner_scene_if_builtin(task_tree->get_bt());
 		Ref<BTTask> sel = task_tree->get_selected();
 		if (sel.is_valid()) {
 			EDIT_RESOURCE(sel);
@@ -854,16 +919,6 @@ void LimboAIEditor::_on_visibility_changed() {
 	}
 }
 
-void LimboAIEditor::_on_header_pressed() {
-	task_tree->clear_selection();
-#ifdef LIMBOAI_MODULE
-	if (task_tree->get_bt().is_valid()) {
-		task_tree->get_bt()->editor_set_section_unfold("blackboard_plan", true);
-	}
-#endif // LIMBOAI_MODULE
-	EDIT_RESOURCE(task_tree->get_bt());
-}
-
 void LimboAIEditor::_on_save_pressed() {
 	if (task_tree->get_bt().is_null()) {
 		return;
@@ -872,7 +927,7 @@ void LimboAIEditor::_on_save_pressed() {
 	if (path.is_empty()) {
 		save_dialog->popup_centered_ratio();
 	} else {
-		_save_bt(path);
+		_save_current_bt(path);
 	}
 }
 
@@ -1060,8 +1115,8 @@ void LimboAIEditor::_tab_clicked(int p_tab) {
 void LimboAIEditor::_tab_closed(int p_tab) {
 	ERR_FAIL_INDEX(p_tab, history.size());
 	Ref<BehaviorTree> history_bt = history[p_tab];
-	if (history_bt.is_valid() && history_bt->is_connected(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_mark_as_dirty))) {
+	if (history_bt.is_valid() && history_bt->is_connected(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_set_as_dirty))) {
-		history_bt->disconnect(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_mark_as_dirty));
+		history_bt->disconnect(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_set_as_dirty));
 	}
 	if (tab_search_context.has(history_bt)) {
 		tab_search_context.erase(history_bt);
@@ -1241,10 +1296,13 @@ void LimboAIEditor::_reload_modified() {
 
 void LimboAIEditor::_resave_modified(String _str) {
 	for (const String &res_path : disk_changed_files) {
-		Ref<BehaviorTree> res = RESOURCE_LOAD(res_path, "BehaviorTree");
+		Ref<BehaviorTree> bt = RESOURCE_LOAD(res_path, "BehaviorTree");
-		if (res.is_valid()) {
+		if (bt.is_valid()) {
-			ERR_FAIL_COND(!res->is_class("BehaviorTree"));
+			ERR_FAIL_COND(!bt->is_class("BehaviorTree"));
-			RESOURCE_SAVE(res, res->get_path(), 0);
+			if (RESOURCE_IS_EXTERNAL(bt)) {
+				// Only resave external - scene files are handled by the editor.
+				_save_bt(bt, bt->get_path());
+			}
 		}
 	}
 	task_tree->update_tree();
@@ -1269,14 +1327,13 @@ void LimboAIEditor::_rename_task_confirmed() {
 	undo_redo->commit_action();
 }
 
-void LimboAIEditor::apply_changes() {
+void LimboAIEditor::save_all(bool p_external_only) {
 	for (int i = 0; i < history.size(); i++) {
 		Ref<BehaviorTree> bt = history.get(i);
 		String path = bt->get_path();
-		if (RESOURCE_EXISTS(path, "BehaviorTree")) {
+		if (RESOURCE_EXISTS(path, "BehaviorTree") && (!p_external_only || RESOURCE_PATH_IS_EXTERNAL(path))) {
-			RESOURCE_SAVE(bt, path, 0);
+			_save_bt(bt, path);
 		}
-		dirty.clear();
 	}
 }
 
@@ -1423,14 +1480,14 @@ void LimboAIEditor::_notification(int p_what) {
 		case NOTIFICATION_EXIT_TREE: {
 			task_tree->unload();
 			for (int i = 0; i < history.size(); i++) {
-				if (history[i]->is_connected(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_mark_as_dirty))) {
+				if (history[i]->is_connected(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_set_as_dirty))) {
-					history[i]->disconnect(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_mark_as_dirty));
+					history[i]->disconnect(LW_NAME(changed), callable_mp(this, &LimboAIEditor::_set_as_dirty));
 				}
 			}
 		} break;
 		case NOTIFICATION_READY: {
 			// **** Signals
-			save_dialog->connect("file_selected", callable_mp(this, &LimboAIEditor::_save_bt));
+			save_dialog->connect("file_selected", callable_mp(this, &LimboAIEditor::_save_current_bt));
 			load_dialog->connect("file_selected", callable_mp(this, &LimboAIEditor::_load_bt));
 			extract_dialog->connect("file_selected", callable_mp(this, &LimboAIEditor::_extract_subtree));
 			new_btn->connect(LW_NAME(pressed), callable_mp(this, &LimboAIEditor::_new_bt));
@@ -1494,7 +1551,7 @@ void LimboAIEditor::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_remove_task", "task"), &LimboAIEditor::_remove_task);
 	ClassDB::bind_method(D_METHOD("_add_task_with_prototype", "prototype_task"), &LimboAIEditor::_add_task_with_prototype);
 	ClassDB::bind_method(D_METHOD("_new_bt"), &LimboAIEditor::_new_bt);
-	ClassDB::bind_method(D_METHOD("_save_bt", "path"), &LimboAIEditor::_save_bt);
+	ClassDB::bind_method(D_METHOD("_save_bt", "path"), &LimboAIEditor::_save_current_bt);
 	ClassDB::bind_method(D_METHOD("_load_bt", "path"), &LimboAIEditor::_load_bt);
 	ClassDB::bind_method(D_METHOD("_update_task_tree", "bt", "specific_task"), &LimboAIEditor::_update_task_tree, DEFVAL(Variant()));
 	ClassDB::bind_method(D_METHOD("edit_bt", "behavior_tree", "force_refresh"), &LimboAIEditor::edit_bt, Variant(false));
@@ -1541,11 +1598,14 @@ LimboAIEditor::LimboAIEditor() {
 	LW_SHORTCUT("limbo_ai/save_behavior_tree", TTR("Save Behavior Tree"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY_MASK(ALT) | LW_KEY(S)));
 	LW_SHORTCUT("limbo_ai/load_behavior_tree", TTR("Load Behavior Tree"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY_MASK(ALT) | LW_KEY(L)));
 	LW_SHORTCUT("limbo_ai/open_debugger", TTR("Open Debugger"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY_MASK(ALT) | LW_KEY(D)));
-	LW_SHORTCUT("limbo_ai/jump_to_owner", TTR("Jump to Owner"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(J)));
+	LW_SHORTCUT("limbo_ai/jump_to_owner", TTR("Jump to Owner"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(G)));
 	LW_SHORTCUT("limbo_ai/close_tab", TTR("Close Tab"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(W)));
 	LW_SHORTCUT("limbo_ai/find_task", TTR("Find Task"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(F)));
 	LW_SHORTCUT("limbo_ai/hide_tree_search", TTR("Close Search"), (Key)(LW_KEY(ESCAPE)));
 
+	// Intercept editor save scene action.
+	LW_SHORTCUT("limbo_ai/editor_save_scene", TTR("Save Scene"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(S)));
+
 	set_process_shortcut_input(true);
 
 	save_dialog = memnew(FileDialog);
@@ -1851,14 +1911,6 @@ LimboAIEditor::~LimboAIEditor() {
 
 //**** LimboAIEditorPlugin
 
-#ifdef LIMBOAI_MODULE
-void LimboAIEditorPlugin::apply_changes() {
-#elif LIMBOAI_GDEXTENSION
-void LimboAIEditorPlugin::_apply_changes() {
-#endif
-	limbo_ai_editor->apply_changes();
-}
-
 void LimboAIEditorPlugin::_bind_methods() {
 }
 
@@ -1867,9 +1919,13 @@ void LimboAIEditorPlugin::_notification(int p_notification) {
 		case NOTIFICATION_READY: {
 			add_debugger_plugin(memnew(LimboDebuggerPlugin));
 			add_inspector_plugin(memnew(EditorInspectorPluginBBPlan));
+
 			EditorInspectorPluginVariableName *var_plugin = memnew(EditorInspectorPluginVariableName);
 			var_plugin->set_editor_plan_provider(Callable(limbo_ai_editor, "get_edited_blackboard_plan"));
 			add_inspector_plugin(var_plugin);
+
+			EditorInspectorPluginPropertyPath *path_plugin = memnew(EditorInspectorPluginPropertyPath);
+			add_inspector_plugin(path_plugin);
 #ifdef LIMBOAI_MODULE
 			// ! Only used in the module version.
 			EditorInspectorPluginBBParam *param_plugin = memnew(EditorInspectorPluginBBParam);
@@ -1917,8 +1973,9 @@ void LimboAIEditorPlugin::edit(Object *p_object) {
 #elif LIMBOAI_GDEXTENSION
 void LimboAIEditorPlugin::_edit(Object *p_object) {
 #endif
-	if (Object::cast_to<BehaviorTree>(p_object)) {
+	Ref<BehaviorTree> bt = Object::cast_to<BehaviorTree>(p_object);
-		limbo_ai_editor->edit_bt(Object::cast_to<BehaviorTree>(p_object));
+	if (bt.is_valid()) {
+		limbo_ai_editor->edit_bt(bt);
 	}
 }
 
@@ -1933,6 +1990,14 @@ bool LimboAIEditorPlugin::_handles(Object *p_object) const {
 	return false;
 }
 
+#ifdef LIMBOAI_MODULE
+void LimboAIEditorPlugin::save_external_data() {
+#elif LIMBOAI_GDEXTENSION
+void LimboAIEditorPlugin::_save_external_data() {
+#endif
+	limbo_ai_editor->save_all(true);
+}
+
 #ifdef LIMBOAI_GDEXTENSION
 Ref<Texture2D> LimboAIEditorPlugin::_get_plugin_icon() const {
 	return LimboUtility::get_singleton()->get_task_icon("LimboAI");

editor/limbo_ai_editor_plugin.h

@@ -207,11 +207,12 @@ private:
 	void _update_misc_menu();
 	void _update_banners();
 	void _new_bt();
-	void _save_bt(String p_path);
+	void _save_bt(const Ref<BehaviorTree> &p_bt, const String &p_path);
-	void _load_bt(String p_path);
+	void _save_current_bt(const String &p_path);
+	void _load_bt(const String &p_path);
 	void _update_task_tree(const Ref<BehaviorTree> &p_bt, const Ref<BTTask> &p_specific_task = nullptr);
 	void _disable_editing();
-	void _mark_as_dirty(bool p_dirty);
+	void _set_as_dirty(const Ref<BehaviorTree> &p_bt, bool p_dirty);
 	void _create_user_task_dir();
 	void _remove_task_from_favorite(const String &p_task);
 	void _save_and_restart();
@@ -242,7 +243,6 @@ private:
 	void _on_tree_task_selected(const Ref<BTTask> &p_task);
 	void _on_tree_task_activated();
 	void _on_visibility_changed();
-	void _on_header_pressed();
 	void _on_save_pressed();
 	void _on_history_back();
 	void _on_history_forward();
@@ -273,7 +273,7 @@ public:
 	void set_window_layout(const Ref<ConfigFile> &p_configuration);
 	void get_window_layout(const Ref<ConfigFile> &p_configuration);
 
-	void apply_changes();
+	void save_all(bool p_external_only = false);
 
 #ifdef LIMBOAI_GDEXTENSION
 	virtual void _shortcut_input(const Ref<InputEvent> &p_event) override { _process_shortcut_input(p_event); }
@@ -299,23 +299,23 @@ public:
 
 	virtual String get_name() const override { return "LimboAI"; }
 	virtual void make_visible(bool p_visible) override;
-	virtual void apply_changes() override;
 	virtual void edit(Object *p_object) override;
 	virtual bool handles(Object *p_object) const override;
 	virtual void set_window_layout(Ref<ConfigFile> p_configuration) override;
 	virtual void get_window_layout(Ref<ConfigFile> p_configuration) override;
+	virtual void save_external_data() override;
 
 #elif LIMBOAI_GDEXTENSION
 	bool _has_main_screen() const override { return true; }
 
 	virtual String _get_plugin_name() const override { return "LimboAI"; }
 	virtual void _make_visible(bool p_visible) override;
-	virtual void _apply_changes() override;
 	virtual void _edit(Object *p_object) override;
 	virtual bool _handles(Object *p_object) const override;
 	virtual Ref<Texture2D> _get_plugin_icon() const override;
 	virtual void _set_window_layout(const Ref<ConfigFile> &p_configuration) override;
 	virtual void _get_window_layout(const Ref<ConfigFile> &p_configuration) override;
+	virtual void _save_external_data() override;
 #endif // LIMBOAI_MODULE & LIMBOAI_GDEXTENSION
 
 	LimboAIEditorPlugin();

editor/task_tree.h

@@ -95,7 +95,7 @@ protected:
 public:
 	void load_bt(const Ref<BehaviorTree> &p_behavior_tree);
 	void unload();
-	Ref<BehaviorTree> get_bt() const { return bt; }
+	_FORCE_INLINE_ Ref<BehaviorTree> get_bt() const { return bt; }
 	void update_tree() { _update_tree(); }
 	void update_task(const Ref<BTTask> &p_task);
 	void add_selection(const Ref<BTTask> &p_task);

register_types.cpp

@@ -120,6 +120,7 @@
 #endif // LIMBOAI_MODULE
 
 #ifdef LIMBOAI_GDEXTENSION
+#include "editor/editor_property_property_path.h"
 #include <godot_cpp/classes/engine.hpp>
 #include <godot_cpp/core/class_db.hpp>
 #include <godot_cpp/core/memory.hpp>
@@ -250,24 +251,26 @@ void initialize_limboai_module(ModuleInitializationLevel p_level) {
 #ifdef TOOLS_ENABLED
 	if (p_level == MODULE_INITIALIZATION_LEVEL_EDITOR) {
 #ifdef LIMBOAI_GDEXTENSION
-		GDREGISTER_CLASS(TaskTree);
+		GDREGISTER_INTERNAL_CLASS(TaskTree);
-		GDREGISTER_CLASS(TaskButton);
+		GDREGISTER_INTERNAL_CLASS(TaskButton);
-		GDREGISTER_CLASS(TaskPaletteSection);
+		GDREGISTER_INTERNAL_CLASS(TaskPaletteSection);
-		GDREGISTER_CLASS(TaskPalette);
+		GDREGISTER_INTERNAL_CLASS(TaskPalette);
-		GDREGISTER_CLASS(ActionBanner);
+		GDREGISTER_INTERNAL_CLASS(ActionBanner);
-		GDREGISTER_CLASS(ModeSwitchButton);
+		GDREGISTER_INTERNAL_CLASS(ModeSwitchButton);
-		GDREGISTER_CLASS(CompatShortcutBin);
+		GDREGISTER_INTERNAL_CLASS(CompatShortcutBin);
-		GDREGISTER_CLASS(CompatScreenSelect);
+		GDREGISTER_INTERNAL_CLASS(CompatScreenSelect);
-		GDREGISTER_CLASS(CompatWindowWrapper);
+		GDREGISTER_INTERNAL_CLASS(CompatWindowWrapper);
-		GDREGISTER_CLASS(LimboDebuggerTab);
+		GDREGISTER_INTERNAL_CLASS(LimboDebuggerTab);
-		GDREGISTER_CLASS(LimboDebuggerPlugin);
+		GDREGISTER_INTERNAL_CLASS(LimboDebuggerPlugin);
-		GDREGISTER_CLASS(BlackboardPlanEditor);
+		GDREGISTER_INTERNAL_CLASS(BlackboardPlanEditor);
-		GDREGISTER_CLASS(EditorInspectorPluginBBPlan);
+		GDREGISTER_INTERNAL_CLASS(EditorInspectorPluginBBPlan);
-		GDREGISTER_CLASS(EditorPropertyVariableName);
+		GDREGISTER_INTERNAL_CLASS(EditorInspectorPluginPropertyPath);
-		GDREGISTER_CLASS(EditorInspectorPluginVariableName);
+		GDREGISTER_INTERNAL_CLASS(EditorPropertyPropertyPath);
-		GDREGISTER_CLASS(OwnerPicker);
+		GDREGISTER_INTERNAL_CLASS(EditorPropertyVariableName);
-		GDREGISTER_CLASS(LimboAIEditor);
+		GDREGISTER_INTERNAL_CLASS(EditorInspectorPluginVariableName);
-		GDREGISTER_CLASS(LimboAIEditorPlugin);
+		GDREGISTER_INTERNAL_CLASS(OwnerPicker);
+		GDREGISTER_INTERNAL_CLASS(LimboAIEditor);
+		GDREGISTER_INTERNAL_CLASS(LimboAIEditorPlugin);
 		GDREGISTER_INTERNAL_CLASS(TreeSearchPanel);
 		GDREGISTER_INTERNAL_CLASS(TreeSearch);
 #endif // LIMBOAI_GDEXTENSION

util/limbo_compat.h

@@ -150,6 +150,7 @@ Variant _GLOBAL_DEF(const PropertyInfo &p_info, const Variant &p_default, bool p
 #define EDSCALE (EditorInterface::get_singleton()->get_editor_scale())
 
 String TTR(const String &p_text, const String &p_context = "");
+#define RTR(m_text) TTR(m_text)
 
 #endif // ! LIMBOAI_GDEXTENSION
 
@@ -173,7 +174,9 @@ Variant VARIANT_DEFAULT(Variant::Type p_type);
 #define IS_RESOURCE_FILE(m_path) (m_path.begins_with("res://") && m_path.find("::") == -1)
 #define RESOURCE_TYPE_HINT(m_type) vformat("%s/%s:%s", Variant::OBJECT, PROPERTY_HINT_RESOURCE_TYPE, m_type)
 #define RESOURCE_IS_BUILT_IN(m_res) (m_res->get_path().is_empty() || m_res->get_path().contains("::"))
+#define RESOURCE_IS_EXTERNAL(m_res) (!RESOURCE_IS_BUILT_IN(m_res))
 #define RESOURCE_PATH_IS_BUILT_IN(m_path) (m_path.is_empty() || m_path.contains("::"))
+#define RESOURCE_PATH_IS_EXTERNAL(m_path) (!RESOURCE_PATH_IS_BUILT_IN(m_path))
 
 #ifdef TOOLS_ENABLED
 

util/limbo_string_names.cpp

@@ -47,6 +47,7 @@ LimboStringNames::LimboStringNames() {
 	button_up = SN("button_up");
 	call_deferred = SN("call_deferred");
 	changed = SN("changed");
+	Clear = SN("Clear");
 	Close = SN("Close");
 	dark_color_2 = SN("dark_color_2");
 	Debug = SN("Debug");
@@ -67,6 +68,7 @@ LimboStringNames::LimboStringNames() {
 	EVENT_FINISHED = SN("finished");
 	EVENT_SUCCESS = SN("success");
 	exited = SN("exited");
+	ExternalLink = SN("ExternalLink");
 	favorite_tasks_changed = SN("favorite_tasks_changed");
 	Favorites = SN("Favorites");
 	FlatButton = SN("FlatButton");
@@ -78,6 +80,7 @@ LimboStringNames::LimboStringNames() {
 	freed = SN("freed");
 	gui_input = SN("gui_input");
 	GuiOptionArrow = SN("GuiOptionArrow");
+	GuiTabMenuHl = SN("GuiTabMenuHl");
 	GuiTreeArrowDown = SN("GuiTreeArrowDown");
 	GuiTreeArrowRight = SN("GuiTreeArrowRight");
 	HeaderSmall = SN("HeaderSmall");

util/limbo_string_names.h

@@ -63,6 +63,7 @@ public:
 	StringName button_up;
 	StringName call_deferred;
 	StringName changed;
+	StringName Clear;
 	StringName Close;
 	StringName dark_color_2;
 	StringName Debug;
@@ -83,6 +84,7 @@ public:
 	StringName EVENT_FINISHED;
 	StringName EVENT_SUCCESS;
 	StringName exited;
+	StringName ExternalLink;
 	StringName favorite_tasks_changed;
 	StringName Favorites;
 	StringName FlatButton;
@@ -94,6 +96,7 @@ public:
 	StringName freed;
 	StringName gui_input;
 	StringName GuiOptionArrow;
+	StringName GuiTabMenuHl;
 	StringName GuiTreeArrowDown;
 	StringName GuiTreeArrowRight;
 	StringName HeaderSmall;