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#!/bin/python3 calendar feed generator
#© 2021 roel roscam abbing gplv3 etc
from ics import Calendar
import requests
import jinja2
import os
import shutil
from slugify import slugify
from natural import date
from event_feed_config import calendar_url, output_dir
import arrow
cal = Calendar(requests.get(calendar_url).text)
env = jinja2.Environment(
if not os.path.exists(output_dir):
template = env.get_template('')
existing_posts = os.listdir(output_dir)
def create_metadata(event):
#construct a formatted dict of event metadata for in a post
event_metadata = {
'description': event.description,
'localized_begin': '           '.join(localize_time(event.begin)), #non-breaking space characters to defeat markdown
'begin': event.begin.format(),
'end': event.end.format(),
'duration': date.compress(event.duration),
'location': event.location,
'uid': event.uid
return event_metadata
def localize_time(date):
# Dates need to be displayed for the various TZs
# takes arrow objects
# 3 PM Kassel, Germany, 4 PM Ramallah/Jerusalem, Palestina (QoF),
# 8 AM Bogota, Colombia (MaMa), 8 PM Jakarta, Indonesia (Gudskul),
# 1 PM (+1day) Wellington, New Zealand (Fafswag), 9 AM Havana, Cuba (Instar).
tzs = [
('Bamako', 'Europe/London'),
('Wellington', 'Pacific/Auckland')
localized_begins =[]
for location, tz in tzs:
localized_begins.append( #javascript formatting because of string creation from hell
'__{}__ {}'.format(
str("YYYY-MM-DD __HH:mm__"))
return localized_begins
def create_event_post(post_dir, event):
event_metadata = create_metadata(event)
if not os.path.exists(post_dir):
with open(os.path.join(post_dir,''),'w') as f:
post = template.render(event = event_metadata)
print('created post for',, '({})'.format(event.uid))
with open(os.path.join(post_dir,'.timestamp'),'w') as f:
def update_event_post(post_dir, event):
if os.path.exists(post_dir):
old_timestamp = open(os.path.join(post_dir,'.timestamp')).read()
if event.created > arrow.get(old_timestamp):
print('Updating',, '({})'.format(event.uid))
create_event_post(post_dir, event)
print('Event current: ',, '({})'.format(event.uid))
for event in list(
post_dir = os.path.join(output_dir, event.uid)
if event.uid not in existing_posts:
#if there is an event we dont already have, make it
create_event_post(post_dir, event)
elif event.uid in existing_posts:
#if we already have it, update
update_event_post(post_dir, event)
existing_posts.remove(event.uid) # create list of posts which have not been returned by the calendar
for post in existing_posts:
#remove events not returned by the calendar (deletion)
print('deleted', post)