[kupfer] objects: Adjust repr_key for RunnableLeaf and TextLeaf

[Ulrik Sverdrup <usverdrup src gnome org>]

commit 919565b34f64fd2fd474b24b6368f3f06ee513dc
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Fri Jan 8 04:55:14 2010 +0100

    objects: Adjust repr_key for RunnableLeaf and TextLeaf
    
    RunnableLeaves almost never need a representative key -- almost all
    are "singletons" (all instances of a particular RunnableLeaf type are
    identical).
    
    TextLeaf uses the text hash as the repr_key -- it is a fixed length,
    for any long text.

 kupfer/objects.py |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/kupfer/objects.py b/kupfer/objects.py
index 1498f13..301a345 100644
--- a/kupfer/objects.py
+++ b/kupfer/objects.py
@@ -1043,6 +1043,8 @@ class RunnableLeaf (Leaf):
 		yield Do()
 	def run(self):
 		raise NotImplementedError
+	def repr_key(self):
+		return ""
 
 class Do (Action):
 	"""Perform the action in a RunnableLeaf"""
@@ -1070,6 +1072,9 @@ class TextLeaf (Leaf, TextRepresentation):
 	def get_actions(self):
 		return ()
 
+	def repr_key(self):
+		return hash(self.object)
+
 	def get_description(self):
 		lines = [l for l in self.object.splitlines() if l.strip()]
 		desc = lines[0] if lines else self.object
@@ -1175,6 +1180,9 @@ class ComposedLeaf (RunnableLeaf):
 		yield Do()
 		yield TimedDo()
 
+	def repr_key(self):
+		return self
+
 	def run(self):
 		from kupfer import commandexec
 		ctx = commandexec.DefaultActionExecutionContext()