# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1443827015 -7200
# Node ID 3422d9d0aa45cc741f2c7487a834b9e9579f3667
# Parent  d5dc0ff83bcc3de56cbabfdc7a12a9abca5a36b7
Added a method to obtain the main period of an object.

diff -r d5dc0ff83bcc -r 3422d9d0aa45 imiptools/data.py
--- a/imiptools/data.py	Fri Oct 02 01:20:08 2015 +0200
+++ b/imiptools/data.py	Sat Oct 03 01:03:35 2015 +0200
@@ -186,6 +186,16 @@
 
     # Computed results.
 
+    def get_main_period(self, tzid):
+
+        """
+        Return a period object corresponding to the main start-end period for
+        the object.
+        """
+
+        (dtstart, dtstart_attr), (dtend, dtend_attr) = self.get_main_period_items(tzid)
+        return RecurringPeriod(dtstart, dtend, tzid, "DTSTART", dtstart_attr, dtend_attr)
+
     def get_main_period_items(self, tzid):
 
         """
@@ -823,7 +833,13 @@
 
     # Use localised datetimes.
 
-    (dtstart, dtstart_attr), (dtend, dtend_attr) = obj.get_main_period_items(tzid)
+    main_period = obj.get_main_period(tzid)
+
+    dtstart = main_period.get_start()
+    dtstart_attr = main_period.get_start_attr()
+    dtend = main_period.get_end()
+    dtend_attr = main_period.get_end_attr()
+
     duration = dtend - dtstart
 
     # Attempt to get time zone details from the object, using the supplied zone
@@ -832,7 +848,7 @@
     obj_tzid = obj.get_tzid()
 
     if not rrule:
-        periods = [RecurringPeriod(dtstart, dtend, tzid, "DTSTART", dtstart_attr, dtend_attr)]
+        periods = [main_period]
 
     elif end or parameters and parameters.has_key("UNTIL") or parameters.has_key("COUNT"):