this_line = log_line.match(line.strip())
			if this_line:
				unchecked_files.add(this_line.group(2))

	for url in unchecked_files:
		reload = False
		recheck = False
		info = 'Checking file: ' + url

		# creating empty placeholder in index
		if not url in index:
			info += '\nThis one is new.'
			index[url] = {}
			reload = True

		# creating file name from url
		file_name = options.dir + re.compile('%20').sub(' ', url)

		# forcibly checking file if no file present
		if not reload and not os.access(file_name, os.R_OK):
			info += '\nFile not found or inaccessible.'
			reload = True

		# forcibly checking file if file size doesn't match with index data
		elif not reload and 'Content-Length' in index[url] and os.stat(file_name).st_size != int(index[url]['Content-Length']):
			info += '\nFile size is ' + os.stat(file_name).st_size + ' and stored file size is ' + index[url]['Content-Length'] + '.'
			reload = True

		# forcibly checking file if index hods Pragma header
		if not reload and 'Pragma' in index[url] and index[url]['Pragma'] == 'no-cache':
			info +='\nPragma on: recheck imminent.'
			recheck = True

		if options.verbose:
			print(info)

		# skipping file processing if there's no need to recheck it and we have checked it at least 4 hours ago
		if not recheck and not reload and '__time__' in index[url] and (datetime.datetime.now() - datetime.timedelta(hours = 4) - index[url]['__time__']).days < 0:
			continue

		try:
			with urllib.request.urlopen(options.root + url) as source:
				new_headers = {}
				headers = source.info()
				if not options.verbose:
					print(info)

				# stripping unneeded headers (XXX make this inplace?)
				for header in headers:
					if header in desc_fields:
						if header == 'Pragma' and headers[header] != 'no-cache':
							print('Pragma:', headers[header])
						new_headers[header] = headers[header]

				index.sync()

		except urllib.error.HTTPError as error:
			# in case of error we don't need to do anything actually,
			# if file download stalls or fails the file would not be moved to it's location
			print(error)

	if options.verbose:
		print('[', len(unchecked_files), '/', checked_files, ']')

	# checking if there were any files downloaded, if yes - restarting sequence
	if checked_files == 0:
		break