Just read sections 11.1.3 and 11.1.6 in the manual.
/Mats
Quoting Carrick Patterson <address@hidden>:
> If somehow you find an answer to this and it doesn't make the list, I wish
> you'd post it. I can think of a million uses for being able to pass a
> variable to a function on the fly, and never have figured out how to do it
> without having a second variable that is actual notes included and putting
> the whole thing around curly brackets. Just to be able to pass a padding
> parameter to a user-written function for spacing, say, rehearsal marks would
> be a great timesaver.
>
>
> From: "Geoff Horton" <address@hidden>
> Date: Thu, 6 Apr 2006 11:57:44 -0400
> To: "Lilypond mailing list" <address@hidden>
> Subject: Macro pre-processing?
>
> I guess I should start by explaining what I want to do. I have a lot
> of notes in chords whose noteheads need to be individually \tweak-ed
> to be smaller. Always on the lookout to reduce typing (and thus
> typos), I tried:
>
> organ = { \tweak "'font-size #-2 }
>
> But LilyPond wants an argument right then and there. I strongly
> suspect I could do a Scheme macro if I knew enough about Scheme and
> LilyPond internals, but that seems overkill when all I really want is
> the equivalent of a C compilers macro expansion capability.
>
> I could write such a utility easily enough in Perl, and I suspect it's
> simple enough that I could learn enough Python to write it without too
> much trouble (thereby not introducing a fourth language into the mix),
> but I'm wondering if there already exists a simple way to do text
> substitutions that I don't know about. (I'd also like to use this for
> a more general conditional interpretation facility than the tags
> supply.)
>
> Geoff
>
>
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