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In most cases a function without arguments should be written with an variable,
dolce = \markup{ \italic \bold dolce }
However, in rare cases it may be useful to create a music function without arguments,
displayBarNum = #(define-music-function (parser location) () (if (eq? #t (ly:get-option 'display-bar-numbers)) #{ \once \override Score.BarNumber #'break-visibility = ##f #} #{#}))
To actually display bar numbers where this function is called, invoke lilypond with
lilypond -d display-bar-numbers FILENAME.ly
Cette page documente LilyPond-2.11.58 (branche de développement).
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