--- versionedFile/versionedFile.py	2005/11/21 20:05:29	1.53
+++ versionedFile/versionedFile.py	2005/11/28 12:31:28	1.54
@@ -7,7 +7,8 @@ from AccessControl import getSecurityMan
 from Products.PageTemplates.PageTemplate import PageTemplate
 from Products.PageTemplates.ZopePageTemplate import ZopePageTemplate
 from AccessControl import ClassSecurityInfo
-
+from difflib import Differ
+from pprint import pprint
 
 from Products.ZCatalog.CatalogPathAwareness import CatalogAware
 
@@ -797,6 +798,25 @@ class versionedFile(CatalogAware,Folder)
                 lastVersion.versionNumber=1
         return lastVersion
     
+    
+    def diff(self,data):
+        """differenz between lastversion and data"""
+        d=Differ()
+        tmp=self.getLastVersion().data
+        #print "XX",data,tmp
+        l=list(d.compare(data.splitlines(1),tmp.splitlines(1)))
+        
+        plus=0
+        minus=0
+        for a in l:
+            if a[0]=='+':
+                plus+=1
+            if a[0]=='-':
+                minus+=1
+        
+        
+        return max([plus,minus]),l
+    
     def index_html(self):
         """main view"""
         lastVersion=self.getLastVersion()