OwnCloud iCal Calendar Importer

ocici.py

#!/usr/bin/env python2
# Works only on Python2 because depends on caldav that only works on Python2
# (but this script should be compatible with Python3)
# https://pypi.python.org/pypi/caldav
# pip install caldav

from __future__ import print_function

import sys
import caldav
import argparse


parser = argparse.ArgumentParser(
        description='Send ICS calendar files to an owncloud CalDAV server')
parser.add_argument('server',
        help="server URL where to send the calendar files")
parser.add_argument('files', nargs='+', metavar="file",
        help="file to send to the server")
parser.add_argument('-v', '--verbose', action='store_true', help="be verbose")
parser.add_argument('-n', '--dry-run', action='store_true',
        help="just show the plan, don't add any events to the calendar")
parser.add_argument('-q', '--quiet', action='store_true', help="be quiet")
parser.add_argument('-c', '--calendar', metavar="NAME",
        help="put the calendar files to the %(metavar)s calendar "
        "(default: first found)")
parser.add_argument('-u', '--username',
        help="log in to server as %(metavar)s (default: no login)")
parser.add_argument('-p', '--password',
        help="log in to server using  %(metavar)s (default: no password)")
parser.add_argument('-X', '--proxy-url', metavar="URL",
        help="use %(metavar)s as proxy (default: no proxy is used)")
parser.add_argument('-P', '--primary-path', metavar="PATH",
        default='/remote.php/caldav/',
        help="use %(metavar)s as the path to OwnCloud Primary CalDAV address "
        " in the server (default: %(default)s)")
args = parser.parse_args()

def vprint(fmt, *fargs, **kwargs):
    if args.verbose:
        print(fmt.format(*fargs), **kwargs)

def qerror(fmt, *fargs, **kwargs):
    if not args.quiet:
        print(fmt.format(*fargs), file=sys.stderr, **kwargs)

url = args.server + args.primary_path

vprint("Retrieving calendars from {} (username={}, proxy={})",
        url, args.username, args.proxy_url)

client = caldav.DAVClient(url, args.proxy_url, args.username, args.password)
principal = caldav.Principal(client)
calendars = principal.calendars()

if len(calendars) == 0:
    qerror("No calendars found in {}", url)
    sys.exit(3)

if args.calendar is None:
    calendar = calendars[0]
else:
    for calendar in calendars:
        if calendar.url.endswith('/' + args.calendar):
            break
    else:
        qerror("No '{}' calendar found", args.calendar)
        sys.exit(4)

vprint("Using calendar {}", calendar)

error = False
for fname in args.files:
    vprint("Reading calendar from '{}'", fname)

    try:
        vcal = open(fname).read()
    except (IOError, OSError) as e:
        qerror("Error opening/reading file '{}', skipping...", fname)
        error = True
        continue

    vprint("\tAdding to calendar")

    if not args.dry_run:
        event = calendar.add_event(vcal)
        vprint("\tEvent {} created", event)

if error:
    sys.exit(1)