icalview.py

#! /usr/bin/env python3

from icalendar import Calendar
from dateutil import tz
from datetime import datetime
import sys
import io
import re

r_atendee = re.compile(r'mailto:', re.IGNORECASE)
def format_atendee(a):
    return r_atendee.sub('', a)

def main():
    cal = sys.stdin.read()
    lines = []
    linesx = []

    for line in cal.splitlines():
        if line.startswith('X-'):
            # Don't process unsupported entries with dateutil.tz to
            # avoid throwing an exception in tzical. We'll show them
            # out to the user later.
            linesx.append(line)
        else:
            lines.append(line)

    tmpfile = io.StringIO()
    tmpfile.write("\n".join(lines))
    tmpfile.seek(0)

    try:
        tzical = tz.tzical(tmpfile)
    except ValueError:
        sys.stderr.write(
            "Sorry, I could not read the calendar file properly.\n" +
            "Please e-mail it to the developer so I can be fixed.\n"
        )
        sys.exit(1)

    try:
        icaltz = tzical.get()
    except ValueError:
        # No Timezone in iCal, assume UTC?
        icaltz = tz.tzutc()

    cal = Calendar.from_ical(cal)
    events = cal.walk('VEVENT')
    evnum = len(events)

    for n, e in enumerate(events):
        if evnum > 1:
            print('** Event {}:'.format(n+1))

        # DEBUG
        #print e
        #print "--------"

        start = e['dtstart'].dt.replace(tzinfo=icaltz).astimezone(tz.tzlocal())
        end = e['dtend'].dt.replace(tzinfo=icaltz).astimezone(tz.tzlocal())
        print('Event: {}'.format(e['summary']))
        print('Start: {}'.format(start.strftime('%a, %Y-%m-%d %H:%M %Z')))
        print('End:   {}'.format(end.strftime('%a, %Y-%m-%d %H:%M %Z')))

        if e.get('organizer'):
            print('Organizer: {}'.format(format_atendee(e['organizer'])))

        if e.get('status'):
            print('Status: {}'.format(e['status']))

        if e.get('location'):
            print('Location: {}'.format(e['location']))

        if e.get('attendee'):
            print('Atendee(s):')
            if isinstance(e['attendee'], list):
                for a in e['attendee']:
                    print(" {}".format(format_atendee(a)))
            else:
                print(" {}".format(format_atendee(e['attendee'])))

        if e.get('description'):
            print('\n{}'.format(e['description']))

        if e.get('comment'):
            print('Comment:\n{}'.format(e['comment']))


        if linesx:
            print("\n-----")
            for line in linesx:
                print(line)

if __name__ == "__main__":
    sys.exit(main())