From 5ce4bd3f4ce955577c46fe8e3c5a8f54b60ce3df Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Mon, 27 Jul 2009 05:57:40 -0400
Subject: [PATCH] Cache data strings in libbe.diff.DiffTree.

This makes repeated .report() generation from the same tree more
efficient.
---
 libbe/diff.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libbe/diff.py b/libbe/diff.py
index 59e7c66..decbcf5 100644
--- a/libbe/diff.py
+++ b/libbe/diff.py
@@ -120,12 +120,15 @@ class DiffTree (tree.Tree):
         if part != None:
             root.append(part)
     def data_string(self, depth, indent=True):
+        if hasattr(self, "_cached_data_string"):
+            return self._cached_data_string
         data_string = self.data_string_fn(self.data)
         if indent == True:
             data_string_lines = data_string.splitlines()
             indent = "  "*(depth)
             line_sep = "\n"+indent
             data_string = indent+line_sep.join(data_string_lines)
+        self._cached_data_string = data_string
         return data_string
 
 class Diff (object):
-- 
2.26.2