From 83ca807a9e0d2a16eff850f050a5e85630d091b1 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Sun, 30 Jun 2013 14:14:08 -0400
Subject: [PATCH] entry: Hash entries by their UID (when possible)

From RFC 5545, section 3.8.4.7 (Unique Identifier):

  Conformance:  The property MUST be specified in the "VEVENT",
      "VTODO", "VJOURNAL", or "VFREEBUSY" calendar components.
---
 pycalendar/entry.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pycalendar/entry.py b/pycalendar/entry.py
index 90e0bac..315a228 100644
--- a/pycalendar/entry.py
+++ b/pycalendar/entry.py
@@ -69,6 +69,13 @@ class Entry (dict):
             self.process()
 
     def __hash__(self):
+        if self.type in [
+                'VEVENT',
+                'VFREEBUSY',
+                'VJOURNAL',
+                'VTODO',
+                ] or 'UID' in self:
+            return hash(_text.unescape(self['UID']))
         return id(self)
 
     def __str__(self):
-- 
2.26.2