Added 'onNodeCreated' hook

Sources/sink/tracking.py

@@ -65,6 +65,7 @@ def __init__( self, state, location, usesSignature=True, accepts=(),
 		self.location( location )
 		assert type(self._accepts) in (tuple, list)
 		assert type(self._rejects) in (tuple, list)
+		state.onNodeCreated(self)
 
 	def isDirectory( self ):
 		"""Tells wether the node is a directory or not."""
@@ -537,6 +538,11 @@ def __init__( self, rootLocation, rootNodeState=None, populate=False,
 		if populate:
 				self.populate()
 
+	def onNodeCreated( self, node ):
+		"""A callback placeholder that can be used to output stuff when a node
+		is created."""
+		return None
+
 	def accepts( self, a ):
 		"""Specifies the GLOBS (as strings) that all inserted node must
 		match."""