input/regression/music-map.ly

   1 \header {
   2
   3   texidoc =
   4
   5   "With @code{music-map}, you can apply functions operating on a
   6 single piece of music to an entire music expression. In this example,
   7 the function @code{notes-to-skip} changes a note to a skip. When
   8 applied to an entire music expression in the 1st measure, the scripts
   9 and dynamics are left over. These are put onto the 2nd measure."
  10
  11 }
  12
  13 \version "2.12.0"
  14
  15 #(define (notes-to-skip m)
  16   "Convert all stuff with duration (notes, lyrics, bass figures, etc.) to skips.
  17 Scripts and dynamics are maintained.
  18 "
  19   (if (memq 'rhythmic-event (ly:music-property m 'types))
  20    (let* ((newmus (make-music 'SkipEvent)))
  21     (map
  22      (lambda (x) (ly:music-set-property! newmus (car x) (cdr x)))
  23      (ly:music-mutable-properties m))
  24     newmus
  25   )
  26    m)
  27 )
  28
  29
  30 \layout { ragged-right= ##t }
  31
  32 foobar =  \transpose c c' { c4\>-^ c4-^ c4\!-^ c4-^  }
  33
  34
  35 \relative c''  \context Voice {
  36   \foobar
  37
  38   << \applyMusic #(lambda (x) (music-map notes-to-skip x))
  39      \foobar
  40      { d8 d d d d d d d  } >>
  41 }