Adapting Lliypond Rendering Engine for iPad

[Feifan Zhou]

I am currently looking  to work on a music notation program for iPad, 
and I believe that Lilypond would 
provide an excellent rendering engine for my needs.
I have downloaded the source code, 
but I am overwhelmed by all the code...
not to mention that I have very 
little expertise in Python and C++. 
As such, I have decided to leave most of the rendering engine as-is, 
and feed input as a Lilypond file, and 
simply use the resulting PDF. 

Could someone guide me through the code, 
and where I can begin to hook up Lilypond to my project?

Many thanks!