schema: use typedef description for type

When available, use the typedef's description for type.

Signed-off-by: Samuel Gauthier <samuel.gauthier@6wind.com>
Acked-by: Robin Jarry <robin@jarry.cc>

Author: samuel-gauthier

libyang/schema.py

@@ -516,6 +516,9 @@ def name(self) -> str:
         return self.basename()
 
     def description(self) -> Optional[str]:
+        typedef = self.typedef()
+        if typedef:
+            return typedef.description()
         return None
 
     def base(self) -> int:

tests/test_schema.py

@@ -382,6 +382,7 @@ def test_leaf_type_derived(self):
         self.assertEqual(mod.get_module_from_prefix("types").name(), "wtf-types")
         self.assertEqual(t.typedef().name(), "host")
         self.assertEqual(t.typedef().description(), "my host type.")
+        self.assertEqual(t.description(), "my host type.")
 
     def test_leaf_type_status(self):
         leaf = next(self.ctx.find_path("/yolo-system:conf/yolo-system:hostname"))