#!/usr/bin/env python
# vim:set ft=python fileencoding=utf-8 sr et ts=4 sw=4 : See help 'modeline'

import sys
import os
import time


def poll_path(target_path='.', timeout=10, idle_time=0.250,
              settle_time=0.100):

    timeout_mark = time.time() + timeout
    before_timestamp = os.stat(target_path).st_mtime
    before_list = os.listdir(target_path)
    while True:
        time.sleep(idle_time)
        after_timestamp = os.stat(target_path).st_mtime
        if after_timestamp != before_timestamp:
            break
        if time.time() > timeout_mark:
            return None
    time.sleep(settle_time)
    after_list = os.listdir(target_path)
    new_files = [ii for ii in after_list if ii not in before_list]
    old_files = [ii for ii in before_list if ii not in after_list]
    return new_files, old_files

if __name__ == '__main__':

    changes = poll_path()
    if changes is None:
        sys.exit(1)
    print ("+%s" % str(changes[0]))
    print ("-%s" % str(changes[1]))
####    try:
####        start_time = time.time()
####        # TODO: set version here.
####        parser = optparse.OptionParser(
####                formatter=optparse.TitledHelpFormatter(),
####                usage=globals()['__doc__'],
####                version='TODO')
####        parser.add_option('-v', '--verbose', action='store_true',
####                default=False, help='verbose output')
####        (options, args) = parser.parse_args()
####        #if len(args) < 1:
####        #    parser.error ('missing argument')
####        if options.verbose: print(time.asctime())
####        exit_code = main(options, args)
####        if exit_code is None:
####            exit_code = 0
####        if options.verbose:
####            print (time.asctime())
####            print ('TIME IN MINUTES: %f'%((time.time()-start_time)/60.0))
####        sys.exit(exit_code)
####    except KeyboardInterrupt as e: # The user pressed Ctrl-C.
####        raise e
####    except SystemExit as e: # The script called sys.exit() somewhere.
####        raise e
####    except Exception as e:
####        print ('ERROR: Unexpected Exception')
####        print (str(e))
####        traceback.print_exc()
####        os._exit(2)