#!/usr/bin/python
# Copyright 1998-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

import os, sys

BUFSIZE = 8192

if __name__ == "__main__":
	from optparse import OptionParser
	usage = "%s [OPTION]... [URL]..." % os.path.basename(sys.argv[0])
	parser = OptionParser(usage=usage)
	parser.add_option("-O", "--output-document", dest="filename",
		help="save uri to FILE", metavar="FILE")
	parser.add_option("-c", "--continue", action="store_true", dest="cont",
		help="continue getting a partially-downloaded file")
	parser.add_option("-b", "--blocksize", type="int",
		help="block size used for read/write", default=BUFSIZE)
	parser.add_option("-q", "--quiet", action="store_true",
		help="disable output")
	options, args = parser.parse_args(sys.argv[1:])
	if len(args) != 1:
		parser.error("missing URL")
	uri = args[0]
	parts = uri.split("://", 1)
	if len(parts) != 2:
		parser.error("invalid URL: % '%s'" % uri)
	protocol = parts[0]
	parts = parts[1].split("/", 1)
	if len(parts) != 2:
		parser.error("invalid URL: % '%s'" % uri)
	host = parts[0]
	path = parts[1]
	userpass_host = host.split("@", 1)
	if len(userpass_host) != 2:
		parser.error("invalid host name: '%s'" % host)
	else:
		host = userpass_host[1]
		userpass = userpass_host[0].split(":")
	if len(userpass) > 2:
		parser.error("invalid user/password: % '%s'" % userpass)
	elif len(userpass) == 2:
		username = userpass[0]
		password = userpass[1]
	elif len(userpass) == 1:
		username = userpass[0]
		password = None
	filename = options.filename
	if not filename:
		filename = os.path.basename(uri)
	size = 0
	if options.cont:
		try:
			size = os.stat(filename).st_size
		except EnvironmentError:
			pass
	bufsize = options.blocksize
	quiet = options.quiet
	stdout = sys.stdout
	if size:
		dest = open(filename, "a")
	else:
		dest = open(filename, "w")
	import paramiko
	t = paramiko.Transport(host)
	t.connect(username=username, password=password)
	conn = paramiko.SFTPClient.from_transport(t)
	f = conn.open(path)
	if size:
		f.seek(size)
	try:
		while True:
			data = f.read(bufsize)
			if not data:
				break
			dest.write(data)
			if not quiet:
				stdout.write(".")
				stdout.flush()
	finally:
		f.close()
	if not quiet:
		stdout.write("\n")
		stdout.flush()