1 files changed, 25 insertions, 0 deletions

diff --git a/hyperkitty/lib/__init__.py b/hyperkitty/lib/__init__.py
index 887cfd5..9b541f9 100644
--- a/hyperkitty/lib/__init__.py
+++ b/hyperkitty/lib/__init__.py
@@ -3,6 +3,7 @@
 import urllib
 from hashlib import md5
 import threading
+import datetime
 
 from django.conf import settings
 
@@ -35,3 +36,27 @@ def gravatar_url(email):
     query_string = urllib.urlencode({'s': size, 'd': default})
     identifier = md5(email).hexdigest()
     return 'http://www.gravatar.com/avatar/%s?%s' % (identifier, query_string)
+
+
+def get_months(store, list_name):
+    """ Return a dictionnary of years, months for which there are
+    potentially archives available for a given list (based on the
+    oldest post on the list).
+
+    :arg list_name, name of the mailing list in which this email
+    should be searched.
+    """
+    date_first = store.get_start_date(list_name)
+    if not date_first:
+        return {}
+    archives = {}
+    now = datetime.datetime.now()
+    year = date_first.year
+    month = date_first.month
+    while year < now.year:
+        archives[year] = range(1, 13)[(month -1):]
+        year = year + 1
+        month = 1
+    archives[now.year] = range(1, 13)[:now.month]
+    return archives
+