libitem: exposed placing_block and emission to lua

doc/en/scripting/builtins/libitem.md

@@ -24,4 +24,7 @@ item.placing_block(itemid: int) -> int
 
 -- Returns the value of the `model-name` property
 item.model_name(itemid: int) -> str
+
+-- Returns item emission property value
+item.emission(itemid: int) -> str
 ```

doc/ru/scripting/builtins/libitem.md

@@ -24,6 +24,9 @@ item.placing_block(itemid: int) -> int
 
 -- Возвращает значение свойства `model-name`
 item.model_name(itemid: int) -> str
+
+-- Возвращает emission параметр у предмета
+item.emission(itemid: int) -> str
 ```
 
 

src/logic/scripting/lua/libs/libitem.cpp

@@ -68,6 +68,22 @@ static int l_model_name(lua::State* L) {
     return 0;
 }
 
+static int l_emission(lua::State* L) {
+    if (auto def = get_item_def(L, 1)) {
+        lua::createtable(L, 4, 0);
+        lua::pushinteger(L, def->emission[0]);
+        lua::rawseti(L, 1);
+        lua::pushinteger(L, def->emission[1]);
+        lua::rawseti(L, 2);
+        lua::pushinteger(L, def->emission[2]);
+        lua::rawseti(L, 3);
+        lua::pushinteger(L, def->emission[3]);
+        lua::rawseti(L, 4);
+        return 1;
+    }
+    return 0;
+}
+
 const luaL_Reg itemlib[] = {
     {"index", lua::wrap<l_index>},
     {"name", lua::wrap<l_name>},
@@ -77,4 +93,5 @@ const luaL_Reg itemlib[] = {
     {"caption", lua::wrap<l_caption>},
     {"placing_block", lua::wrap<l_placing_block>},
     {"model_name", lua::wrap<l_model_name>},
+    {"emission", lua::wrap<l_emission>},
     {NULL, NULL}};