Make my mangled, Keystone-generated calendars fit for human consumption.

fix-keystone-calendar.py

import datetime
# you can get this with 'pip install icalendar'
from icalendar import Calendar, vDate

# load a file called 'capstone.ics'
# you can get this by opening your calendar feed link in your browser
with open('capstone.ics','rb') as f:
    cal = Calendar.from_ical(f.read())

cal_filtered = Calendar()

# get rid of all the events after 2/25/2022, but keep if
# it has the urlhttps://keystone.wustl.edu/events?id=4760
for sc in cal.subcomponents:
    if sc.name == 'VEVENT':
        dt = sc['DTSTART'].dt
        if dt < datetime.datetime(year=2022, month=2, day=25, tzinfo=dt.tzinfo):
            cal_filtered.add_component(sc)
        elif sc['URL'] == 'https://keystone.wustl.edu/events?id=4760':
            cal_filtered.add_component(sc)
    else:
        cal_filtered.add_component(sc)


# rewrite all the mangled all-day events as proper
# all day events using the vDate property (rather
# than the vDatetime property)
cal_normalized = Calendar()
for sc in cal_filtered.subcomponents:
    if sc.name == 'VEVENT':
        dt_start = sc['DTSTART'].dt
        dt_end = sc['DTEND'].dt

        if dt_start + datetime.timedelta(days=1) == dt_end:
            sc['DTSTART'] = vDate(dt_start.date())
            sc['DTEND'] = vDate(dt_start.date())
        cal_normalized.add_component(sc)
    else:
        cal_normalized.add_component(sc)

# write the output file to disk as 'cal_filtered.ics'
with open('cal_filtered.ics', 'wb') as f:
    f.write(cal_normalized.to_ical())