Add -I <Interval>, Remove -o <offset>, and Refactor -n #521
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Based on this issue.
The Interval option allows to download a subset of a Playlist or all User options.
It is compatible with all other options including --download-archive, --sync, and -n.
It can be used like this:
scdl -l https://soundcloud.com/one-thousand-and-one/sets/playlist1 -I [10,36]
scdl -l https://soundcloud.com/one-thousand-and-one/sets/playlist1 -I [,36]
scdl -l https://soundcloud.com/one-thousand-and-one/sets/playlist1 -I [10,]
The interval bounds are inclusive.
Indexing starts from 1.
The option supports left- and right-unbounded intervals.
Since a right-unbounded interval equals a skip function, the offset option can be safely removed.
The original recency sorting -n has been refactored to just -n to avoid clashing track limits.
Some tests are currently broken.
The format could potentially be changed to allow for faster typing on the console.