--- a/bitsyblog/bitsyblog.py	Thu Nov 17 12:15:43 2011 -0800
+++ b/bitsyblog/bitsyblog.py	Thu Nov 17 13:18:51 2011 -0800
@@ -611,8 +611,12 @@
     def cooked_entry(self, entry):
         """cook the entry"""
         if (entry.user, entry.datestamp()) not in self.cooked_bodies:
-           self.cooked_bodies[(entry.user, entry.datestamp())] = self.cooker(entry.body)
-        return self.cooked_bodies[(entry.user, entry.datestamp())]
+           self.cooked_bodies[(entry.user, entry.datestamp())] = (self.cooker(entry.body), entry.modified())
+        body, modified = self.cooked_bodies[(entry.user, entry.datestamp())]
+        if entry.modified() > modified:
+            body = self.cooker(entry.body)
+            self.cooked_bodies[(entry.user, entry.datestamp())] = (body, entry.modified())
+        return body
 
     def write_blog(self, user, blog, path, n_links, request):
         """return the user's blog in HTML"""

--- a/bitsyblog/blog.py	Thu Nov 17 12:15:43 2011 -0800
+++ b/bitsyblog/blog.py	Thu Nov 17 13:18:51 2011 -0800
@@ -1,5 +1,6 @@
 """blog interfaces to data for bitsy"""
 
+import datetime
 import os
 import utils
 
@@ -9,10 +10,11 @@
 
 class BlogEntry(object):
     """interface class for a blog entry"""
-    def __init__(self, date, body, privacy, user):
+    def __init__(self, date, body, privacy, user, modified=None):
         self.date = date
         self.body = body
         self.privacy = privacy
+        self._modified = modified
         if user is not None:
             self.user = user
 
@@ -49,6 +51,11 @@
     def datestamp(self):
         return utils.datestamp(self.date)
 
+    def modified(self):
+        """returns the last modification date"""
+        return self._modified or self.datestamp()
+
+
 class Blog(object):
     """abstract class for a users' blog"""
 
@@ -102,19 +109,20 @@
         return file(self.location(user, permission, datestamp)).read()
 
     def get_entry(self, user, datestamp, permission):
-        return BlogEntry(utils.date(datestamp), 
+        modified = datetime.datetime.fromtimestamp(os.path.getmtime(self.location(user, permission, datestamp)))
+        return BlogEntry(utils.date(datestamp),
                          self.body(user, datestamp, permission),
-                         permission, user)
+                         permission, user, modified=modified)
 
     ### interfaces from Blog
 
-    def blog(self, user, permissions, number=None):        
+    def blog(self, user, permissions, number=None):
         entries = []
         for permission in permissions:
-            entries.extend([ (entry, permission) 
+            entries.extend([(entry, permission)
                              for entry in os.listdir(self.location(user, permission)) ])
         entries.sort(key=lambda x: x[0], reverse=True)
-        
+
         if number is not None:
             entries = entries[:number]
 
@@ -144,8 +152,8 @@
         # get the blog entries
         entries = []
         for permission in permissions:
-            entries.extend([ (os.path.split(entry)[-1], permission) 
-                             for entry in glob(os.path.join(self.location(user, permission), glob_expr)) ])
+            entries.extend([(os.path.split(entry)[-1], permission)
+                            for entry in glob(os.path.join(self.location(user, permission), glob_expr))])
         entries.sort(key=lambda x: x[0], reverse=True)
         return [ self.get_entry(user, x[0], x[1]) for x in entries ]
 

--- a/bitsyblog/utils.py	Thu Nov 17 12:15:43 2011 -0800
+++ b/bitsyblog/utils.py	Thu Nov 17 13:18:51 2011 -0800
@@ -17,11 +17,10 @@
 
 def ReST2html(string):
     """renders a string with restructured text"""
-    
+
     settings = { 'report_level': 5 }
     string = string.strip()
     try:
-            
         parts = docutils.core.publish_parts(string,
                                             writer_name='html',
                                             settings_overrides=settings)
@@ -32,7 +31,7 @@
     return body
 
 def validate_css(css):
-    """use a webservice to determine if the argument is valid css"""    
+    """use a webservice to determine if the argument is valid css"""
     url = 'http://jigsaw.w3.org/css-validator/validator?text=%s'
     url = url % urllib.quote_plus(css)
     foo = urllib2.urlopen(url)
@@ -48,6 +47,8 @@
     return datetime.datetime(*retval)
 
 def datestamp(date=None):
+    if isinstance(date, float):
+        date = datetime.datetime.fromtimestamp(date)
     if date is None:
         date = datetime.datetime.now()
     return date.strftime(timestamp)