thumbnail = optparse.OptionGroup(parser, 'Thumbnail Options')
thumbnail.add_option(
'--write-thumbnail',
- action='store_true', dest='writethumbnail', default=False,
+ action='callback', dest='writethumbnail', default=False,
+ # Should override --no-write-thumbnail, but not --write-all-thumbnail
+ callback=lambda option, _, __, parser: setattr(
+ parser.values, option.dest, getattr(parser.values, option.dest) or True),
help='Write thumbnail image to disk')
thumbnail.add_option(
'--no-write-thumbnail',
help='Do not write thumbnail image to disk (default)')
thumbnail.add_option(
'--write-all-thumbnails',
- action='store_true', dest='write_all_thumbnails', default=False,
+ action='store_const', dest='writethumbnail', const='all',
help='Write all thumbnail image formats to disk')
thumbnail.add_option(
'--list-thumbnails',