Re: Scoping problem in define-music-function

[Reinhold Kainhofer]

Am Montag, 27. September 2010, um 10:28:53 schrieb Marc Hohl:
> <string>:2:46: Fehler: GUILE signalisierte einen Fehler für den hier
> beginnenden Ausdruck
>     \override TabNoteHead #(quote stencil) = #
>                                               (my-special-callback fret)
> Unbound variable: fret
> 
> So fret is not known within #{ ... #}.

It is known. But you have to tell lilypond that it should be the argument of 
the function and not just a normal scheme symbol.

See
http://lilypond.org/doc/v2.13/Documentation/notation/substitution-function-
syntax.html
In particular:
"where 
  …music… normal LilyPond input, using $ to reference arguments (eg. ‘$arg1’)"

So all you need to do is to prepend a $ to indicate that fret is the symbol 
from the scoping function.

Cheers,
Reinhold



-- 
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org