Feature/undo - observers and metadata

lib/nif.ex

@@ -174,12 +174,26 @@ defmodule Yex.Nif do
     do: :erlang.nif_error(:nif_not_loaded)
 
   def undo_manager_include_origin(_undo_manager, _origin), do: :erlang.nif_error(:nif_not_loaded)
+  def undo_manager_exclude_origin(_undo_manager, _origin), do: :erlang.nif_error(:nif_not_loaded)
+  def undo_manager_can_undo(_manager), do: :erlang.nif_error(:nif_not_loaded)
+  def undo_manager_can_redo(_manager), do: :erlang.nif_error(:nif_not_loaded)
   def undo_manager_undo(_undo_manager), do: :erlang.nif_error(:nif_not_loaded)
   def undo_manager_redo(_undo_manager), do: :erlang.nif_error(:nif_not_loaded)
   def undo_manager_expand_scope(_undo_manager, _scope), do: :erlang.nif_error(:nif_not_loaded)
-  def undo_manager_exclude_origin(_undo_manager, _origin), do: :erlang.nif_error(:nif_not_loaded)
   def undo_manager_stop_capturing(_undo_manager), do: :erlang.nif_error(:nif_not_loaded)
   def undo_manager_clear(_undo_manager), do: :erlang.nif_error(:nif_not_loaded)
+
+  def undo_manager_observe_item_added(_manager, _observer), do: :erlang.nif_error(:nif_not_loaded)
+
+  def undo_manager_observe_item_updated(_manager, _observer),
+    do: :erlang.nif_error(:nif_not_loaded)
+
+  def undo_manager_observe_item_popped(_manager, _observer),
+    do: :erlang.nif_error(:nif_not_loaded)
+
+  def undo_manager_unobserve_item_added(_manager), do: :erlang.nif_error(:nif_not_loaded)
+  def undo_manager_unobserve_item_updated(_manager), do: :erlang.nif_error(:nif_not_loaded)
+  def undo_manager_unobserve_item_popped(_manager), do: :erlang.nif_error(:nif_not_loaded)
 end
 
 defmodule Yex.Nif.Util do