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#!/usr/bin/env python3
# Copyright 2023 Florian Fischer
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <https://www.gnu.org/licenses/>.
"""Notify the responsible people about occuring events via signal messages"""
import argparse
import datetime
import pathlib
import os
import sys
import typing as t
import subprocess
import icalevents
from icalevents.icalevents import events
RESPONSIBILITIES_ENV_VAR_NAME = 'SEN_RESPONSIBILITIES'
def load_events(uri: str, start: datetime.datetime,
end: datetime.datetime) -> list[icalevents.icalparser.Event]:
"""Retrieve all events from the specified ics calendars"""
evs = []
if uri.startswith("http"):
evs += events(url=uri, start=start, end=end)
elif pathlib.Path(uri).is_file():
evs += events(file=uri, start=start, end=end)
return evs
def load_responsibilities(start: datetime.date,
resp_file_path='',
offset=0) -> list[str]:
"""Load resposibility definitions
If no file path containing responsibilities is passed se tyhe environment.
The environment variable 'SEN_RESPONSIBILITIES' is used to pass
a line separated list of responsibilities per calendar week."""
all_resp = ''
if resp_file_path and pathlib.Path(resp_file_path).is_file():
with open(resp_file_path, 'r', encoding='utf-8') as resp_file:
all_resp = resp_file.read()
all_resp = all_resp or os.environ.get(RESPONSIBILITIES_ENV_VAR_NAME, '')
if not all_resp:
print(f'{RESPONSIBILITIES_ENV_VAR_NAME} not set', file=sys.stderr)
sys.exit(1)
resps_order = all_resp.splitlines()
cal_week = start.isocalendar()[1]
if len(resps_order) == 52:
resp = resps_order[cal_week - 1]
else:
resp = resps_order[((cal_week + offset) % len(resps_order)) - 1]
return resp.split(',')
def fmt_mentions(
responsibilities: t.Optional[list[str]] = None) -> t.Tuple[str, str]:
"""Return a string of mentions and the required cli arguments for signal-cli"""
if not responsibilities:
return '', ''
mention_notification_prfx = ''
mention_arg = ''
for resp in responsibilities:
tokens = resp.split(':')
if len(tokens) > 1:
name = tokens[0]
num = tokens[1]
else:
name = num = tokens[0]
mention_arg += f' {len(mention_notification_prfx)}:{len(name)}:{num}'
mention_notification_prfx += f', {name}'
return mention_notification_prfx[2:], f'--mention {mention_arg[1:]}'
def notify(notification: str,
signal_user: str,
recipients: t.Optional[list[str]] = None,
group: t.Optional[str] = None):
'''notify a group or a list of recipients about events'''
if not recipients and not group:
return
mentions, mentions_arg = fmt_mentions(responsibilities=recipients)
if mentions:
notification = f'{mentions} {notification}'
cmd = f'signal-cli -u {signal_user} send --message-from-stdin {mentions_arg}'
if group:
cmd += f' -g {group}'
subprocess.run(cmd.split(), input=notification.encode(), check=True)
def main():
"""Programm entry point loading data from webuntis and printing the remaining lessons"""
parser = argparse.ArgumentParser()
parser.add_argument('--date', help='The date to notify for')
parser.add_argument('--calendar', help='The calendars URI')
parser.add_argument('--responsibilities-file',
help='A file specifying the responsibilities per line')
parser.add_argument('--responsibilities-offset',
default=0,
type=int,
help='Offset in the responsibilities file')
parser.add_argument('--group',
help='The group notifications should be send to')
parser.add_argument('user', help='The signal user sending messages')
args = parser.parse_args()
if args.date:
tomorrow = datetime.date.fromisoformat(args.date)
else:
tomorrow = datetime.date.today() + datetime.timedelta(days=1)
end = tomorrow + datetime.timedelta(days=1)
recipients = load_responsibilities(
tomorrow,
resp_file_path=args.responsibilities_file,
offset=args.responsibilities_offset)
# load ICS events
evs = load_events(args.calendar, tomorrow, end)
if not evs:
return
notification = ''
for event in evs:
if event.start.date() != tomorrow:
continue
notification += f' {event.summary}'
if notification:
notify(notification, args.user, recipients, args.group)
if __name__ == '__main__':
main()
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