Hello list,
thanks to Reinhold Kainhofer and Wilbert Berendsen I managed to get a
callback with an
additional argument.
Now I want to write a music function like this:
myFunction = #(define-music-function parser location fret music)
(string? ly:music?)
(let (( ... some expressions ... ))
#{
\override TabNoteHead #'stencil = #(my-special-callback fret)
#}
(..some more scheme stuff working on music...)
#{
\revert TabNoteHead #'stencil
#}
))
but lilypond complains with
<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 #{ ... #}.
Is there a way to define the function in an appropriate way? It doesn't
matter if
the given variable fret is an argument to the music function or
calculated within the let-block.
Thanks in advance
Marc
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