watcher.py

import time
from subprocess import call
import shlex
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler


class Watcher:
    DIRECTORY_TO_WATCH = "./img"

    def __init__(self):
        self.observer = Observer()

    def run(self):
        event_handler = Handler()
        self.observer.schedule(event_handler, self.DIRECTORY_TO_WATCH, recursive=True)
        self.observer.start()
        try:
            while True:
                time.sleep(5)
        except:
            self.observer.stop()
            print "Error"

        self.observer.join()


class Handler(FileSystemEventHandler):

    @staticmethod
    def on_any_event(event):
        if event.is_directory:
            return None

        elif event.event_type == 'created':
            # Take any action here when a file is first created.
            print "Received created event - %s." % event.src_path

            #write the name of the new file in the tweet_list.txt file
            f = open('tweet_list.txt', 'ab')
            f.write(event.src_path+'\n')
            f.close()

            #execute the post_tweet script
            call(shlex.split('bash post_tweet.sh'))

        elif event.event_type == 'modified':
            # Taken any action here when a file is modified.
            print "Received modified event - %s." % event.src_path


if __name__ == '__main__':
    w = Watcher()
    w.run()