Prompted by the recent discussion on lute tablature, I tried coding a Scheme
engraver to create the duration grobs but quickly ran into a problem. I need
to collect information from both a Listener and an Acknowledger so the obvious
place to build the grob is in stop-translator-timestep, but my attempts all
result in a LilyPond crash. I'm on Windows Vista, so the crash code is not
very helpful - 1073741819.
Minimal examples below. The first creates a grob from the Listener and works
fine. The second tries to create a grob from stop-translator-timestep and
fails.
What am I doing wrong?
This works:
\version "2.19.46"
engraver_demo =
#(make-engraver
(listeners
((note-event engraver event)
(let ((grob (ly:engraver-make-grob engraver 'TextScript event)))
(ly:grob-set-property! grob 'text "hi")))))
\layout {
\context {
\Voice
\consists
\engraver_demo
}
}
\relative {
c'8
}
This fails:
\version "2.19.46"
#(define ev #f)
engraver_demo =
#(make-engraver
(listeners
((note-event engraver event)
(set! ev event)))
((stop-translation-timestep engraver)
(let ((grob (ly:engraver-make-grob engraver 'TextScript ev)))
(ly:grob-set-property! grob 'text "hi"))))
\layout {
\context {
\Voice
\consists
\engraver_demo
}
}
\relative {
c'8
}
Thanks, Trevor
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