Initial stab at showing list of folders that aren't being synced

This isn't working right yet because two accounts could sync into one
destination

offlineimap/repository/Base.py

@@ -17,6 +17,7 @@
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 
 from offlineimap import CustomConfig
+from offlineimap.ui import UIBase
 import os.path
 
 def LoadRepository(name, account, reqtype):
@@ -165,6 +166,17 @@ class BaseRepository(CustomConfig.ConfigHelperMixin):
         #    if not key in srchash:
         #        dest.deletefolder(key)
 
+
+        ##### Find any folders that aren't being synced
+        ignoredfolders = []
+        for key in desthash.keys():
+            if not key in srchash:
+                ignoredfolders.append(key)
+
+        ignoredfolders.sort()
+        if ignoredfolders != []:
+            UIBase.getglobalui().warn("Found local folders that are not being synced: %s" % (", ".join(ignoredfolders)))
+        
     ##### Keepalive
 
     def startkeepalive(self):