#!/usr/bin/env python3

# https://gist.github.com/ParagDoke/2388d7311f11cab4fa5f5538fa694d0e

# The only examples are the tests:

# /usr/lib/python3/dist-packages/icalendar/tests/

import sys

from icalendar import Calendar

import datetime

import argparse

def read_ics_file(infile):

"""Parse an ics file into a dictionary.

"""

cal = Calendar.from_ical(open(infile, 'rb').read())

# Get the local timezone

localtz = datetime.datetime.now().astimezone().tzinfo

event = {}

for component in cal.walk():

if component.name != 'VEVENT':

continue

if 'SUMMARY' in event:

print("Yikes, more than one event!")

event['SUMMARY'] = component.get('summary')

event['DESCRIPTION'] = component.get('description')

event['LOCATION'] = component.get('location')

event['DTSTART'] = component.get('DTSTART').dt

event['DTEND'] = component.get('DTEND').dt

# I don't know what the dtstamp or exdate are. No docs.

# dtstamp = component.get('DTSTAMP')

# exdate = component.get('exdate')

# Rewrite into current timezone

event['LOCALSTART'] = event['DTSTART'].astimezone(localtz)

event['LOCALEND'] = event['DTEND'].astimezone(localtz)

# dtstamp.dt = dtstamp.dt.astimezone(localtz)

return event

def print_event(event):

"""Print in an informal but readable way."""

print(f"START: {event['LOCALSTART'].strftime('%a, %d %b %Y %I:%M %Z')}")

if event['DTSTART'].tzinfo != event['LOCALSTART'].tzinfo:

print(f" ({event['DTSTART'].strftime('%a, %d %b %Y %I:%M %Z')})")

print(f" END: {event['LOCALEND'].strftime('%a, %d %b %Y %I:%M %Z')}")

if event['DTEND'].tzinfo != event['LOCALEND'].tzinfo:

print(f" ({event['DTEND'].strftime('%a, %d %b %Y %I:%M %Z')})")

print("SUMMARY", event['SUMMARY'])

print("LOCATION", event['LOCATION'])

# Description for some events is really long.

if len(event['DESCRIPTION']) > 300:

print("DESCRIPTION", event['DESCRIPTION'][:300], "...")

else:

print("DESCRIPTION", event['DESCRIPTION'])

def remind_for_event(ev):

"""Create a line that can be added to a file for /usr/bin/remind."""

desc = ev['DESCRIPTION'].replace('\n\n', '\n').replace('\n', ' ||| ')

print(f"REM {ev['LOCALSTART'].strftime('%d %m %Y')} +1 MSG {ev['SUMMARY']} ||| LOCATION {ev['LOCATION']} ||| DESCRIPTION: ||| {desc}")

if __name__ == '__main__':

parser = argparse.ArgumentParser(description="Parse ical files")

parser.add_argument('-f', action="store", dest="format", default="text",

help='Output format: text (default), remind')

parser.add_argument('files', nargs='+', help="Input ical files")

args = parser.parse_args(sys.argv[1:])

# print("args", args)

events = [ read_ics_file(f) for f in args.files ]

for ev in events:

if args.format == "remind":

remind_for_event(ev)

else:

print_event(ev)