Document R sourcecode with Tex

I'm actually afraid that this is a RTFM question - I read the manual but
didn't find anything yet... I'm looking for a way to document R sourcecode
in my thesis. Does anyone know of a tool or function which can convert or
export R sourcecode to Tex? 

GNU a2ps, an "anything to postscript" converter, can typeset and pretty-print
some 40+ languages, R and S included. thanks to a file Kurt, Torsten and I 
contributed to a2ps. At least Debian's a2ps includes this 'style sheet' file, others
can fetch it from CRAN.

It is of course meant directly for a printer (or viewer as gv) -- but some true 
postscript wizard might know a trick to 'extract' the pretty-printed code?
 
Dirk

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