Preprocessing ly files

[address@hidden]

Is there a simple way to filter a lilypond file trough a preprocessor so that
some lilypond instructions are executed or not according to some general 
directive?
For example, if I have lilypond source written for F horn and wont to run it for
Eb horn also I would like to have a macro directive like (C preprocessor idiom)

#ifdef EB_HORN
\transpose c d
#endif

Is there something like this already available or can it be easyly implemented?

Thank you for your help,

Antonio Palamà



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