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Add slicing notation to --playlist-items

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* Adds support for negative indices and step
* Add `-I` as alias for `--playlist-index`
* Deprecates `--playlist-start`, `--playlist-end`, `--playlist-reverse`, `--no-playlist-reverse`

Closes #2951, Closes #2853
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pukkandan 2022-06-17 10:18:21 +05:30
parent f0c9fb9682
commit 7e88d7d78f
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6 changed files with 306 additions and 175 deletions
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16
yt_dlp/options.py
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@ -500,15 +500,19 @@ def create_parser():
selection.add_option(
'--playlist-start',
dest='playliststart', metavar='NUMBER', default=1, type=int,
help='Playlist video to start at (default is %default)')
help=optparse.SUPPRESS_HELP)
selection.add_option(
'--playlist-end',
dest='playlistend', metavar='NUMBER', default=None, type=int,
help='Playlist video to end at (default is last)')
help=optparse.SUPPRESS_HELP)
selection.add_option(
'--playlist-items',
'-I', '--playlist-items',
dest='playlist_items', metavar='ITEM_SPEC', default=None,
help='Playlist video items to download. Specify indices of the videos in the playlist separated by commas like: "--playlist-items 1,2,5,8" if you want to download videos indexed 1, 2, 5, 8 in the playlist. You can specify range: "--playlist-items 1-3,7,10-13", it will download the videos at index 1, 2, 3, 7, 10, 11, 12 and 13')
help=(
'Comma seperated playlist_index of the videos to download. '
'You can specify a range using "[START]:[STOP][:STEP]". For backward compatibility, START-STOP is also supported. '
'Use negative indices to count from the right and negative STEP to download in reverse order. '
'Eg: "-I 1:3,7,-5::2" used on a playlist of size 15 will download the videos at index 1,2,3,7,11,13,15'))
selection.add_option(
'--match-title',
dest='matchtitle', metavar='REGEX',
@ -885,11 +889,11 @@ def create_parser():
downloader.add_option(
'--playlist-reverse',
action='store_true',
help='Download playlist videos in reverse order')
help=optparse.SUPPRESS_HELP)
downloader.add_option(
'--no-playlist-reverse',
action='store_false', dest='playlist_reverse',
help='Download playlist videos in default order (default)')
help=optparse.SUPPRESS_HELP)
downloader.add_option(
'--playlist-random',
action='store_true',