import shlex
import sys
+from .downloader.external import list_external_downloaders
from .compat import (
compat_expanduser,
compat_getenv,
'--playlist-reverse',
action='store_true',
help='Download playlist videos in reverse order')
+ downloader.add_option(
+ '--external-downloader',
+ dest='external_downloader', metavar='COMMAND',
+ help='(experimental) Use the specified external downloader. '
+ 'Currently supports %s' % ','.join(list_external_downloaders()))
workarounds = optparse.OptionGroup(parser, 'Workarounds')
workarounds.add_option(