Python + asyncio + rx + gstreamer + curses music player

All the data is kept in SQLite.

Basic concepts

track - a metadata for a music piece
track stream - a stream of music data for a track
library - keeps all your tracks
playlist - a named subset of your library
provider - an entity that delivers track stream e.g. Youtube, Spotify, local drive
cloud - a service which we sync to e.g. Google Drive, AWS S3
sync - a process of syncing your library with a cloud
command - a piece of code invokable by keybinding or command palette

rip - downloads the track stream from provider to your local drive. Automatically adds the track to the library if it's not there yet.
rip library - tries to rip every track in the library
rip current playlist - tries to rip every track in the current playlist

The sync is not automatic. It always have to be triggered manually. There are several commands here.

sync: push library - pushes the SQLite database to a cloud
sync: pull library - pulls the SQLite database from a cloud
sync: push track - pushes the selected track to a cloud if ripped
sync: pull track - pulls the selected track from a cloud if available
sync: push all tracks - like above but for all tracks
sync: pull all tracks - like above but for all tracks

TODO