Connect it up.

Inelegant but functional.

joy/gui/world.py

@@ -29,7 +29,7 @@ from inspect import getdoc
 from joy.joy import run
 from joy.library import HELP_TEMPLATE
 from joy.parser import Symbol
-from joy.utils.stack import stack_to_string
+from joy.utils.stack import iter_stack, stack_to_string
 from joy.utils.types import type_check
 from .utils import is_numerical
 
@@ -152,3 +152,18 @@ class StackDisplayWorld(World):
 		if os.path.exists(self.filename):
 			with open(self.filename, 'rb') as f:
 				return pickle.load(f)
+
+
+class StackWorld(StackDisplayWorld):
+
+	viewer = None
+
+	def set_viewer(self, viewer):
+		self.viewer = viewer
+
+	def print_stack(self):
+		StackDisplayWorld.print_stack(self)
+		if self.viewer:
+			self.viewer.stack = list(iter_stack(self.stack))
+			self.viewer._update()
+