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In most cases a function without arguments should be written with an identifier,
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
Previous: Void functions, Up: Music functions
This page is for LilyPond-2.10.33 (stable-branch).