Could someone with knowhow help me to debug this music function? I want a
function to create arrows in a Lilypond score:
arrow = #(define-music-function (parser location arg1 ) ( pair?)
#{
\markup { \line \draw-line #arg1 \arrow-head #X #RIGHT ##t }}
#})
When I process:
\version "2.16.0"
\include "header.ly"
\score {
\new Staff {
c4_\arrow #'(10 . 0)
}
}
I get output:
Ontleden...
arrowtest.ly:10:3: fout: music function cannot return (#<procedure line-markup
(layout props args)> ((#<procedure draw-line-markup (layout props dest)> (10 .
0)) (#<procedure arrow-head-markup (layout props axis dir filled)> 0 1 #t)))
c4_
\arrow #'(10 . 0)
Interpreting music...
programmeerfout: Not a music type
Thanks in advance,
Vivian.
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