Use folder argument as base for album/playlist file exports.

[Silverfeelin]

Use const.args.folder when using -b or -p.

Related

• https://github.com/ritiek/spotify-downloader/issues/340 Permission Error
• https://github.com/ritiek/spotify-downloader/issues/423 Pass custom filenames when writing playlists, albums, etc. to text files

Context
I set up a script that uses an URI handler to call spotdl. This allows the application to be called from an URI such as spotdl:https://open.spotify.com/album/0OkJThJls8FO1lutMzMDJ0.
https://msdn.microsoft.com/en-us/windows/desktop/aa767914

The problem I faced is that the current working directory for my application is C:\Windows\System32, which results in permission issues (https://github.com/ritiek/spotify-downloader/issues/340). The output directory for songs works around this issue, but the same can not currently be said for playlists and albums.

These changes re-use the folder parameter to put the album or playlist text files in the supplied folder. From what I can tell -f is already required for both -p and -b even though the value is ignored.
The global const was not included in spotify_tools.py but because it was referenced in just about every other script I figured it wouldn't hurt to include it here as well. In particular, youtube_tools.py already uses it in the same fashion when downloading songs.

[ritiek]

Cool stuff. Thanks for the PR!

I can merge this once you add a changelog entry in CHANGES.md. I think this would best go under Changed sub-section (You'll need to create this section under Unreleased section ).

[Silverfeelin]

Like that?

[ritiek]

Yep, looks good. Thanks again!