add responsibility offset

When the number of responsibilities is not a factor of 52 the next year
has to start with an offset to continue the ongoing cycle.
Since the event notifier is state less we pass the needed offset for the
current year on the command line.

1 files changed, 10 insertions, 3 deletions

diff --git a/signal_event_notifier.py b/signal_event_notifier.py
index 144298b..d7d1525 100755
--- a/signal_event_notifier.py
+++ b/signal_event_notifier.py
@@ -40,7 +40,8 @@ def load_events(uri: str, start: datetime.datetime,
 
 
 def load_responsibilities(start: datetime.date,
-                          resp_file_path='') -> list[str]:
+                          resp_file_path='',
+                          offset=0) -> list[str]:
     """Load resposibility definitions
 
     If no file path containing responsibilities is passed se tyhe environment.
@@ -62,7 +63,7 @@ def load_responsibilities(start: datetime.date,
     if len(resps_order) == 52:
         resp = resps_order[cal_week - 1]
     else:
-        resp = resps_order[(cal_week % len(resps_order)) - 1]
+        resp = resps_order[((cal_week + offset) % len(resps_order)) - 1]
 
     return resp.split(',')
 
@@ -117,6 +118,10 @@ def main():
     parser.add_argument('--calendar', help='The calendars URI')
     parser.add_argument('--responsibilities-file',
                         help='A file specifying the responsibilities per line')
+    parser.add_argument('--responsibilities-offset',
+                        default=0,
+                        type=int,
+                        help='Offset in the responsibilities file')
     parser.add_argument('--group',
                         help='The group notifications should be send to')
     parser.add_argument('user', help='The signal user sending messages')
@@ -129,7 +134,9 @@ def main():
     end = tomorrow + datetime.timedelta(days=1)
 
     recipients = load_responsibilities(
-        tomorrow, resp_file_path=args.responsibilities_file)
+        tomorrow,
+        resp_file_path=args.responsibilities_file,
+        offset=args.responsibilities_offset)
 
     # load ICS events
     evs = load_events(args.calendar, tomorrow, end)