Add support for processing and importing ics without UID

khal/icalendar.py

@@ -27,6 +27,7 @@
 import logging
 import pytz
 from collections import defaultdict
+from hashlib import sha256
 
 from .exceptions import UnsupportedRecurrence
 from .parse_datetime import guesstimedeltafstr, rrulefstr
@@ -62,6 +63,12 @@ def split_ics(ics, random_uid=False, default_timezone=None):
             tzs[key] = item
 
         if item.name == 'VEVENT':
+            if 'UID' not in item:
+                logger.warning(
+                    f"Event with summary '{item['SUMMARY']}' doesn't have a unique ID."
+                    "A generated ID will be used instead."
+                )
+                item['UID'] = sha256(item.to_ical()).hexdigest()
             events_grouped[item['UID']].append(item)
         else:
             continue

tests/icalendar_test.py

@@ -78,3 +78,11 @@ def test_windows_timezone(caplog):
     cal = _get_text("tz_windows_format")
     split_ics(cal)
     assert "Cannot find timezone `Pacific/Auckland`" not in caplog.text
+
+
+def test_split_ics_without_uid():
+    cal = _get_text('without_uid')
+    vevents = split_ics(cal)
+    assert vevents
+    vevents2 = split_ics(cal)
+    assert vevents[0] == vevents2[0]

tests/ics/without_uid.ics

@@ -0,0 +1,10 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//PIMUTILS.ORG//NONSGML khal / icalendar //EN
+BEGIN:VEVENT
+SUMMARY:An Event
+DTSTART;VALUE=DATE:20140409
+DTEND;VALUE=DATE:20140410
+DTSTAMP;VALUE=DATE-TIME:20140401T234817Z
+END:VEVENT
+END:VCALENDAR