I've read in the Lilypond documentation chapter 11, "Interfaces for
programmers", Appendix B, "Scheme tutorial", and the beginning of the
Scheme manual at:
http://www.swiss.ai.mit.edu/ftpdir/scheme-reports/r5rs-html/r5rs_toc.html
But I'm stuck on a simple problem which probably has a simple answer.
In the Lilypond Snippet Repository, there's an example titled, "Engraving
music using Scheme expressions":
http://lsr.dsi.unimi.it/LSR/Item?id=122
That works fine on my system (Lilypond 2.9.17, Linux).
But I'm trying to make a tiny addition to that code, and it isn't working.
Here is their example, which outputs the notes C and D:
#(define (make-note-req p d)
(make-music 'NoteEvent
'duration d
'pitch p))
#(define (make-note elts)
(make-music 'EventChord
'elements elts))
#(define (seq-music-list elts)
(make-music 'SequentialMusic
'elements elts))
fooMusic = #(seq-music-list
(list (make-note (list (make-note-req (ly:make-pitch 1 0 0)
(ly:make-duration 2 0))))
(make-note (list (make-note-req (ly:make-pitch 1 1 0)
(ly:make-duration 2 0))))))
\score { \fooMusic
}
I want to define a variable and plug it into, say, the second number of
(ly:make-pitch 1 0 0).
So I would expect that I could simply put one of these lines at the
beginning of the file:
mypitch = #0
#(define mypitch 0)
and then change the expression:
(ly:make-pitch 1 0 0)
to:
(ly:make-pitch 1 $mypitch 0)
but when I do that, it complains:
"ERROR: Unbound variable: $mypitch"
Why doesn't this work?
Marcus
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