Add support of multiple RRULE

README.rst

@@ -41,6 +41,7 @@ Let's put our expertise together and build a tool that can solve this!
 * events with start date and no end date (DONE)
 * events with start as date and start as datetime (DONE)
 * `RRULE <https://www.kanzaki.com/docs/ical/rrule.html>`_ (DONE)
+* events with multiple RRULE (DONE)
 * `RDATE <https://www.kanzaki.com/docs/ical/rdate.html>`_ (DONE)
 * `DURATION <https://www.kanzaki.com/docs/ical/duration.html>`_ (DONE)
 * `EXDATE <https://www.kanzaki.com/docs/ical/exdate.html>`_ (DONE)
@@ -291,6 +292,10 @@ To release new versions,
 Changelog
 ---------
 
+- Incoming
+
+  - Add support for multiple RRULE in events.
+
 - v2.2.0
 
   - Add ``after()`` method to iterate over upcoming events.

recurring_ical_events.py

@@ -214,25 +214,31 @@ def __init__(self, component, keep_recurrence_attributes=False):
 
         self.duration = self.end - self.start
         self.rule = rule = rruleset(cache=True)
-        _rule = component.get("RRULE", None)
-        if _rule:
-            # We don't support multiple RRULE yet, but we can support cases
-            # where the same RRULE is erroneously repeated
-            if isinstance(_rule, list):
-                if len(_rule) > 0 and all(part == _rule[0] for part in _rule):
-                    _rule = _rule[0]
-                else:
-                    raise ValueError("Don't yet support multiple distinct RRULE properties")
-            self.rrule = self.create_rule_with_start(_rule.to_ical().decode())
-            rule.rrule(self.rrule)
-        else:
-            self.rrule = None
+        _component_rules = component.get("RRULE", None)
+        rrules = []
+        if _component_rules:
+            if not isinstance(_component_rules, list):
+                _component_rules = [_component_rules]
+            else:
+                _dedup_rules=[]
+                for _rule in _component_rules:
+                    if _rule not in _dedup_rules:
+                        _dedup_rules.append(_rule)
+                _component_rules = _dedup_rules
+
+            for _rule in _component_rules:
+                rrule = self.create_rule_with_start(_rule.to_ical().decode())
+                rrules.append(rrule)
+                rule.rrule(rrule)
 
         for exdate in self.exdates:
             rule.exdate(exdate)
         for rdate in self.rdates:
             rule.rdate(rdate)
-        if not self.rrule or not self.rrule.until or not compare_greater(self.start, self.rrule.until):
+
+        untils = [rrule.until for rrule in rrules if rrule and rrule.until]
+        self.max_until = max(untils) if untils else None
+        if not rrules or not self.max_until or not compare_greater(self.start, self.max_until):
             rule.rdate(self.start)
 
     def create_rule_with_start(self, rule_string):
@@ -339,7 +345,7 @@ def within_days(self, span_start, span_stop):
                 start = start.tzinfo.localize(start.replace(tzinfo=None))
                 # We could now well be out of bounce of the end of the UNTIL
                 # value. This is tested by test/test_issue_20_exdate_ignored.py.
-                if self.rrule is not None and self.rrule.until is not None and start > self.rrule.until and start not in self.rdates:
+                if self.max_until is not None and start > self.max_until and start not in self.rdates:
                     continue
             if self._unify_exdate(start) in self.exdates_utc or start.date() in self.exdates_utc:
                 continue

test/calendars/multiple_rrule.ics

@@ -0,0 +1,16 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//CyrusIMAP.org/Cyrus 
+ 3.9.0-alpha0-85-gd6d859e0cf-fm-20230116.001-gd6d859e0//EN
+BEGIN:VEVENT
+CREATED:20230109T084023Z
+LAST-MODIFIED:20230119T110732Z
+DTSTAMP:20230119T110732Z
+UID:56cdc4dc-11b7-407c-86c6-9faedfc28afb
+SUMMARY:My repeating event
+RRULE:FREQ=WEEKLY;BYDAY=TH;COUNT=20
+RRULE:FREQ=MONTHLY;BYDAY=2MO;COUNT=2
+DTSTART;TZID=Europe/London:20230112T100000
+DTEND;TZID=Europe/London:20230112T120000
+END:VEVENT
+END:VCALENDAR

test/test_multiple_rrule.py

@@ -0,0 +1,12 @@
+
+from datetime import date
+
+
+def test_multiple_rrule(calendars):
+    events = calendars.multiple_rrule.at(2023)
+    assert len(events) == 20 + 2
+    event_dstarts = [event['DTSTART'].dt.date() for event in events]
+    assert date(2023,2,9) in event_dstarts
+    assert date(2023,2,13) in event_dstarts
+    assert date(2023,2,16) in event_dstarts
+    assert date(2023,3,13) in event_dstarts