ly/chord-repetition-init.ly

   1 \version "2.13.8"
   2 %{
   3 Two functions define the chord repetition behavior, and may
   4 be invoked by the user to customize it.
   5
   6 ly:parser-set-repetition-symbol
   7   set the chord repetition shortcut.
   8   `q' is the default value set in this file.
   9
  10 ly:parser-set-repetition-function
  11   set the function that is invoked when a chord repetition symbol
  12   is encountered by the parser: a three argument function
  13   (previous-chord, duration, list of articulations) which is supposed
  14   to return a new chord.
  15   `default-repeat-chord' is the default function set in this file.
  16 %}
  17
  18 #(define-public (default-repeat-chord previous-chord duration articulations)
  19    "Copy the previous chord, filter out events which are not notes, set the
  20 chord duration, add articulations."
  21    (let ((new-chord (ly:music-deep-copy previous-chord)))
  22      (set! (ly:music-property new-chord 'elements)
  23            (append! articulations
  24                     (filter (lambda (event)
  25                               (eqv? (ly:music-property event 'name) 'NoteEvent))
  26                             (ly:music-property new-chord 'elements))))
  27      (for-each (lambda (event)
  28                  (if (ly:duration? (ly:music-property event 'duration))
  29                      (set! (ly:music-property event 'duration) duration)))
  30                (ly:music-property new-chord 'elements))
  31     new-chord))
  32
  33 #(ly:parser-set-repetition-symbol parser 'q)
  34 #(ly:parser-set-repetition-function parser default-repeat-chord)