Likes to Playlists

I wrote because SoundCloud removed the ability to add tracks to playlists (sets) from the mobile client. I use this extensively, so I just scripted my own workflow. TL;DR it adds anything you've liked to the playlist for this month.

Here's the logic:

• Get all playlists (sets)
• Get all favorites (likes)
• Select the playlist named as Playlist_permalink_title as this_month_playlist. Note that if multiple playlists are created with the same title, they're named as the downcase'd spaces-to-hyphens title, with things like apostrophes translated to hyphens for hte permalink. Beware.
• If the playlist Playlist_permalink_title can't be found, create it as Playlist_actual_title. If you're not sure if your Playlist_permalink_title and Playlist_actual_title line up, test it first.
• generate favs_this_month by cherry-picking favorites (from the most-recent Page_size ordered by Pagination_order) which are newer than Favorites_to_add_date (defaults: 200, created_at, DateTime.now.utc.beginning_of_month (SC stores all dates as UTC))
• If all of the items in favs_this_month exist in this_month_playlist, do nothing. This accounts for this_month_playlist having things not present in favs_this_month
• If there are tracks IDs in favs_this_month not present in this_month_playlist, combine the track IDs from favs_this_month and this_month_playlist and update this_month_playlist on SoundCloud (and locally).
• Display any tracks being added, along with favs_this_month and this_month_playlist

How 2

You'll need an app key and secret for this. Get that here.

Put those and your SoundCloud username / password in oauth-config.yaml in the same directory as this script. An example for you to edit is included as oauth-config.yaml.dist. This is the OAuth Uesr Credentials Flow if you're wondering, and yes; this could be much simpler if SoundCloud had a web UI to generate OAuth user tokens for developers.

To base64-encode your password, do something like this: echo -n 'your-password-here' |base64

To install the requirements, a bundle install should do it. Built for Ruby 2.1.

This is quite rough right now, and there's an issue where if the thing you liked wasn't cerated in the past month, it won't be added. It looks like SoundCloud doesn't track the date of when you add something, so I'm not sure how to get around that. Please submit a PR if you have suggestions (line 50).