How do I use C Library with Rails + Swig? - ruby-on-rails

I've programmed 2 rails apps so far that have definitely gotten me pretty comfortable with ruby + rails. I can't say the same about C though. I don't even know what I'm looking at to be honest any time I look at C. It looks like macaroni.
I'm trying to build a spotify web app. The web API sucks, so I have to use this: https://developer.spotify.com/technologies/libspotify/
Documentation: https://developer.spotify.com/technologies/libspotify/docs/12.1.45/
Someone told me I can look at SWIG as a wrapper to communicate with rails.
The data I'm trying to get is 3 things: Number of subscribers, playlist thumbnail, number of tracks... given a playlist URL in the format of: http://open.spotify.com/user/{{username}}/playlist/{{playlist_id}}
To be honest, I have no idea where to even start. I can't find any swig tutorials online, and staring at this documentation isn't helping.
Could someone maybe give me a very brief 1,2,3 step procedure that one might go through to do something like this? I don't really expect any code.. but.. this is very roughly what I understand so far.. perhaps someone could help me fill this in..
save all C files you need to rails lib directory
compile files with ... ?
use swig somehow
:|
Any help would be super appreciated. I realize this is vague and 'subjective' but I don't even know how to ask this objectively. Just a quick 1-2-3-4-5 to get me started so I can do some googling would be fantastic.
Edit: I did find this, but this seems to be much obsolete: https://github.com/sarnesjo/greenstripes

Well, this is certainly not the answer but just thought to gather some related links here.
http://www.eqqon.com/index.php/Ruby_C_Extension_API_Documentation_(Ruby_1.8)
http://java.ociweb.com/mark/programming/Ruby_C_Extensions.pdf
http://people.apache.org/~rooneg/talks/ruby-extensions/ruby-extensions.html
Let us know about any update.

After some digging I have found this. I think this is the answer for my ruby libspotify wrapper: https://github.com/Burgestrand/Hallon

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