auto document variable in ui-document lua script

res/layouts/inventory.xml.lua

@@ -1,6 +1,3 @@
-local Document = require("core:document")
-document = Document.new(DOC_NAME)
-
 function on_open(invid)
     print("OPEN", invid)
 end

res/modules/document.lua

@@ -1,22 +0,0 @@
-local Element = {}
-function Element.new(docname, name)
-    return setmetatable({docname=docname, name=name}, {
-        __index=function(self, k)
-            return gui.getattr(self.docname, self.name, k)
-        end,
-        __newindex=function(self, k, v)
-            gui.setattr(self.docname, self.name, k, v)
-        end
-    })
-end
-
-local Document = {}
-function Document.new(docname)
-    return setmetatable({name=docname}, {
-        __index=function(self, k)
-            return Element.new(self.name, k)
-        end
-    })
-end
-
-return Document

res/scripts/stdlib.lua

@@ -110,4 +110,27 @@ end
 color_mt = {}
 function color_mt.__tostring(self)
     return "rgba("..self[1]..", "..self[2]..", "..self[3]..", "..self[4]..")"
-end
+end
+
+-- class designed for simple UI-nodes access via properties syntax
+local Element = {}
+function Element.new(docname, name)
+    return setmetatable({docname=docname, name=name}, {
+        __index=function(self, k)
+            return gui.getattr(self.docname, self.name, k)
+        end,
+        __newindex=function(self, k, v)
+            gui.setattr(self.docname, self.name, k, v)
+        end
+    })
+end
+
+-- the engine automatically creates an instance for every ui document (layout)
+Document = {}
+function Document.new(docname)
+    return setmetatable({name=docname}, {
+        __index=function(self, k)
+            return Element.new(self.name, k)
+        end
+    })
+end

src/logic/scripting/api/libgui.cpp

@@ -33,6 +33,16 @@ static bool getattr(lua_State* L, gui::Button* button, const std::string& attr)
     return false;
 }
 
+static bool getattr(lua_State* L, gui::Label* label, const std::string& attr) {
+    if (label == nullptr)
+        return false;
+    if (attr == "text") {
+        lua_pushstring(L, util::wstr2str_utf8(label->getText()).c_str());
+        return true;
+    }
+    return false;
+}
+
 static bool setattr(lua_State* L, gui::Button* button, const std::string& attr) {
     if (button == nullptr)
         return false;
@@ -43,6 +53,16 @@ static bool setattr(lua_State* L, gui::Button* button, const std::string& attr)
     return false;
 }
 
+static bool setattr(lua_State* L, gui::Label* label, const std::string& attr) {
+    if (label == nullptr)
+        return false;
+    if (attr == "text") {
+        label->setText(util::str2wstr_utf8(lua_tostring(L, 4)));
+        return true;
+    }
+    return false;
+}
+
 int l_gui_getattr(lua_State* L) {
     auto docname = lua_tostring(L, 1);
     auto element = lua_tostring(L, 2);
@@ -59,6 +79,8 @@ int l_gui_getattr(lua_State* L) {
 
     if (getattr(L, dynamic_cast<gui::Button*>(node), attr))
         return 1;
+    if (getattr(L, dynamic_cast<gui::Label*>(node), attr))
+        return 1;
 
     return 0;
 }
@@ -72,6 +94,8 @@ int l_gui_setattr(lua_State* L) {
 
     if (setattr(L, dynamic_cast<gui::Button*>(node), attr))
         return 0;
+    if (setattr(L, dynamic_cast<gui::Label*>(node), attr))
+        return 0;
 
     return 0;
 }

src/logic/scripting/scripting.cpp

@@ -130,6 +130,16 @@ std::unique_ptr<Environment> scripting::create_doc_environment(int parent, const
     state->setfield("DOC_ENV");
     state->pushstring(name.c_str());
     state->setfield("DOC_NAME");
+    
+    if (state->getglobal("Document")) {
+        if (state->getfield("new")) {
+            state->pushstring(name.c_str());
+            if (state->callNoThrow(1)) {
+                state->setfield("document", -3);
+            }
+        }
+        state->pop();
+    }
     state->pop();
     return std::make_unique<Environment>(id);
 }
@@ -246,7 +256,6 @@ bool scripting::on_item_break_block(Player* player, const ItemDef* item, int x,
 }
 
 void scripting::on_ui_open(UiDocument* layout, Inventory* inventory) {
-    timeutil::ScopeLogTimer log(555);
     std::string name = layout->getId()+".open";
     if (state->getglobal(name)) {
         state->pushinteger(inventory->getId());