Turns calendar events in to HUGO posts. Lumbung-interlokal members can use it to schedule events from a shared calendar and have them appear as event announcements on lumbung.space
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#lumbung.space 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
from urllib.parse import urlparse
import arrow
import re
cal = Calendar(requests.get(calendar_url).text)
env = jinja2.Environment(
if not os.path.exists(output_dir):
template = env.get_template('event_template.md')
existing_posts = os.listdir(output_dir)
def findURLs(string):
return all URLs in a given string
regex = r"(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'\".,<>?«»“”‘’]))"
url = re.findall(regex,string)
return [x[0] for x in url]
def find_imageURLS(string):
return all image URLS in a given string
regex = r"(?:http\:|https\:)?\/\/.*?\.(?:png|jpg|jpeg|gif|svg)"
img_urls = re.findall(regex, string, flags=re.IGNORECASE)
return img_urls
def create_metadata(event):
construct a formatted dict of event metadata for use as frontmatter for HUGO post
if event.location:
location_urls = findURLs(event.location)
if location_urls:
location_url = location_urls[0]
event.location = '[{}]({})'.format(urlparse(location_url).netloc, location_url)
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,
'images' : find_imageURLS(event.description) # currently not used in template
return event_metadata
def localize_time(date):
Turn a given date into various timezones
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(date.to(tz).format("YYYY-MM-DD __HH:mm__"))
return localized_begins
def create_event_post(post_dir, event):
Create HUGO post based on calendar event metadata
Searches for image URLS in description and downloads them
Function is also called when post is in need of updating
In that case it will also delete images no longer in metadata
TODO: split this up into more functions for legibility
if not os.path.exists(post_dir):
event_metadata = create_metadata(event)
#list already existing images
#so we can later delete them if we dont find them in the event metadata anymore
existing_images = os.listdir(post_dir)
for img in event_metadata['images']:
#parse img url to safe local image name
img_name = img.split('/')[-1]
fn, ext = img_name.split('.')
img_name = slugify(fn) + '.' + ext
local_image = os.path.join(post_dir, img_name)
if not os.path.exists(local_image):
#download preview image
response = requests.get(img, stream=True)
with open(local_image, 'wb') as img_file:
shutil.copyfileobj(response.raw, img_file)
print('Downloaded image for event "{}"'.format(event.name))
event_metadata['description'] = event_metadata['description'].replace(img, '![]({})'.format(img_name))
if img_name in existing_images:
for left_over_image in existing_images:
#remove images we found, but which are no longer in remote event
print('deleted image', left_over_image)
with open(os.path.join(post_dir,'index.md'),'w') as f:
post = template.render(event = event_metadata)
print('created post for', event.name, '({})'.format(event.uid))
with open(os.path.join(post_dir,'.timestamp'),'w') as f:
def update_event_post(post_dir, event):
Update a post based on the VCARD event 'created' field which changes when updated
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', event.name, '({})'.format(event.uid))
create_event_post(post_dir, event)
print('Event current: ', event.name, '({})'.format(event.uid))
for event in list(cal.events):
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)