Python script to add a Calendar Event on OS/X using pyobjc

osx_cal_add_event.py

#!/usr/local/bin/python
# A quick script to add an event to my iCloud Home Calendar
# Usage: osx_cal_add_event.py <YYYY-MM-DD> <"Title of event">
# it adds an all-day event.
#
# By Brett Hutley <brett@hutley.net>
#
import sys
import objc
objc.setVerbose(True)
from CalendarStore import CalCalendarStore, CalEvent, CalTask
from Cocoa import NSDate
import datetime

def create_event(year, month, day, title):
    dt = datetime.date(year, month, day)
    seconds = (dt - datetime.date.today()).total_seconds()
    event_date = NSDate.dateWithTimeIntervalSinceNow_(seconds)
    new_event = CalEvent.event()
    new_event._.calendar = home_cal
    new_event._.startDate = event_date
    new_event._.endDate = event_date
    new_event._.title = title
    new_event._.isAllDay = True
    res, err = CalCalendarStore.defaultCalendarStore().saveEvent_span_error_(new_event, 0, None)
    if res:
        return new_event
    raise Exception(err.localizedDescription())

def usage():
    print("Usage: %s <YYYY-MM-DD> <Title of event>" % (sys.argv[0], ))
    
if len(sys.argv) != 3 or len(sys.argv[1]) != 10:
    usage()
    exit(0)

dtfields = sys.argv[1].split('-')
if len(dtfields) != 3:
    usage()
    exit(0)
    
year = int(dtfields[0])
month = int(dtfields[1])
day = int(dtfields[2])
title = sys.argv[2]

home_cal = None
for cal in CalCalendarStore.defaultCalendarStore().calendars():
    if cal.title() == "Home" and cal.type() == "CalDAV":
        home_cal = cal
        break

if home_cal is None:
    print("Couldn't find a CalDAV Home calendar")
    exit(0)

create_event(year, month, day, title)