# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1427210095 -3600
# Node ID c057e9aac79c391f8a32b3b813914512d0a8d235
# Parent  21f7421c806afae71fa3195c4fd34f4917f54d14
Allow the sorting of periods to handle both dates and datetimes.

diff -r 21f7421c806a -r c057e9aac79c imiptools/data.py
--- a/imiptools/data.py	Mon Mar 23 00:39:26 2015 +0100
+++ b/imiptools/data.py	Tue Mar 24 16:14:55 2015 +0100
@@ -433,7 +433,7 @@
     # Return a sorted list of the periods.
 
     periods = list(periods)
-    periods.sort()
+    periods.sort(cmp=compare_periods(tzid))
 
     # Exclude exception dates.
 
@@ -451,6 +451,17 @@
 
     return periods
 
+class compare_periods:
+    def __init__(self, tzid):
+        self.tzid = tzid
+    def __call__(self, first, second):
+        first_start, first_end = first[:2]
+        second_start, second_end = second[:2]
+        return cmp(
+            (to_datetime(first_start, self.tzid), to_datetime(first_end, self.tzid)),
+            (to_datetime(second_start, self.tzid), to_datetime(second_end, self.tzid))
+            )
+
 def get_periods_for_freebusy(obj, periods, tzid):
 
     """