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#!/usr/bin/env python3
"""
Copyright (C) 2013 - Ebru Akagündüz <ebru.akagunduz@gmail.com>
This file is part of watchdog-email-notification.
watchdog-email-notification 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.
watchdog-email-notification 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 <http://www.gnu.org/licenses/>
"""
import time
import smtplib
from email.mime.text import MIMEText

from watchdog.events import PatternMatchingEventHandler
from watchdog.observers import Observer

SMTP_SERVER = "smtp.gmail.com"
SMTP_PORT = 587
SMTP_USERNAME = "user"
SMTP_PASSWORD = "passwd"
EMAIL_TO = "to"
EMAIL_FROM = "from"
EMAIL_SUBJECT = "Info from watchdog"
PATH = "/etc/"


def send_email(file_path):
    message = MIMEText(f"{file_path} changed\n\n{time.asctime()}")
    message["Subject"] = EMAIL_SUBJECT
    message["To"] = EMAIL_TO
    message["From"] = EMAIL_FROM
    mail_server = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)
    mail_server.starttls()
    mail_server.login(SMTP_USERNAME, SMTP_PASSWORD)
    mail_server.sendmail(EMAIL_FROM, EMAIL_TO, message.as_string())
    mail_server.quit()


class FileEventHandler(PatternMatchingEventHandler):
    @staticmethod
    def _on_event(event):
        send_email(event.src_path)

    on_modified = on_deleted = on_created = _on_event

    @staticmethod
    def on_moved(event):
        # if exist backup file
        if event.src_path + "~" == event.dest_path:
            return
        send_email(event.src_path)


def main():
    observer = Observer()
    event_handler = FileEventHandler(
        ignore_patterns=["*.swp", "*.swx", "*.swpx"]
    )
    observer.schedule(event_handler, PATH, recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()
    

if __name__ == "__main__":
    main()