Changed 'registerHelp' to do nothing if the help files haven't changed on disk...

Changed 'registerHelp' to do nothing if the help files haven't changed on disk since that last time help was registered.

lib/python/App/ProductContext.py

@@ -89,6 +89,8 @@ import Globals, os, OFS.ObjectManager, OFS.misc_, Products, OFS.PropertySheets
 from HelpSys import HelpTopic
 from HelpSys.HelpSystem import ProductHelp
 import string, os.path
+import stat
+from DateTime import DateTime
 
 if not hasattr(Products, 'meta_types'): Products.meta_types=()
 if not hasattr(Products, 'meta_classes'):
@@ -267,27 +269,37 @@ class ProductContext:
         Register a Help Topic for a product.
         """
         self.__prod.__of__(self.__app.Control_Panel.Products).getProductHelp()._setObject(id, topic)
-         
+
     def registerHelp(self, directory='help', clear=1):
         """
         Registers Help Topics for all objects in a directory.
 
+        Nothing will be done if the files in the directory haven't
+        changed since the last registerHelp call.
+
         'clear' indicates whether or not to delete all existing
         Topics from the Product.
-        
+
         HelpTopics are created for these kind of files
-        
+
         .dtml            -- DTMLHelpTopic
         .html .htm .txt  -- TextHelpTopic        
         .stx .txt        -- STXHelpTopic
         .jpg .png .gif   -- ImageHelpTopic
         """
+        help=self.__prod.__of__(self.__app.Control_Panel.Products).getProductHelp()
+        path=os.path.join(Globals.package_home(self.__pack.__dict__), directory)
+        
+        # test to see if nothing has changed since last registration
+        if help.lastRegistered is not None and \
+                help.lastRegistered >= DateTime(os.stat(path)[stat.ST_MTIME]):
+            return
+        help.lastRegistered=DateTime()
+        
         if clear:
-            help=self.__prod.__of__(self.__app.Control_Panel.Products).getProductHelp()
             for id in help.objectIds('Help Topic'):
                 help._delObject(id)
-
-        path=os.path.join(Globals.package_home(self.__pack.__dict__), directory)
+       
         for file in os.listdir(path):
             ext=os.path.splitext(file)[1]
             ext=string.lower(ext)
@@ -299,8 +311,7 @@ class ProductContext:
                 self.registerHelpTopic(file, ht)
             elif ext in ('.stx', '.txt'):
                 ht=HelpTopic.STXTopic(file, '', os.path.join(path, file))
-                self.registerHelpTopic(file,ht)
+                self.registerHelpTopic(file, ht)
             elif ext in ('.jpg', '.gif', '.png'):
                 ht=HelpTopic.ImageTopic(file, '', os.path.join(path, file))
-                self.registerHelpTopic(file,ht)
-                
+                self.registerHelpTopic(file, ht)