input/regression/lily-in-scheme.ly

   1 \header { texidoc = "LilyPond syntax can be used inside scheme to
   2     build music expressions, with the @code{#@{ ... #@}} syntax.
   3     Scheme forms can be introduced inside these blocks by escaping
   4     them with a @code{$}, both in a LilyPond context or in a Scheme
   5     context.
   6
   7 In this example, the @code{\\withpaddingA}, @code{\\withpaddingB} and
   8 @code{\\withpaddingC} music functions set different kinds of padding on
   9 the @code{TextScript} grob.
  10
  11 "
  12
  13       }
  14
  15 \version "2.12.0"
  16 \layout { ragged-right = ##t }
  17
  18 withPaddingA = #(define-music-function (parser location padding music) (number? ly:music?)
  19                  #{ \override TextScript #'padding = #$padding
  20                  $music
  21                  \revert TextScript #'padding #})
  22
  23 withPaddingB = #(define-music-function (parser location padding music) (number? ly:music?)
  24                  #{ \override TextScript #'padding = #$(* padding 2)
  25                  $music
  26                  \revert TextScript #'padding #})
  27
  28 withPaddingC = #(define-music-function (parser location padding music) (number? ly:music?)
  29                  #{ \override TextScript #'padding = #(+ 1 $(* padding 2))
  30                     $music
  31                     \revert TextScript #'padding #})
  32
  33 {
  34     c'^"1"
  35     \withPaddingA #2
  36     { c'^"2" c'^"3"}
  37     c'^"4"
  38     \withPaddingB #2
  39     { c'^"5" c'^"6"}
  40     c'^"7"
  41     \withPaddingC #2
  42     { c'^"8" c'^"9"}
  43     c'^"10"
  44 }