input/regression/scheme-engraver.ly

   1 \header {
   2
   3   texidoc = "\\consists can take a scheme alist as arguments, which
   4   should be functions, which will be invoked as engraver functions."
   5
   6 }
   7
   8 \version "2.13.11"
   9
  10 \layout {
  11   \context {
  12     \Voice
  13     \consists
  14     #(list
  15       (cons 'initialize
  16        (lambda (trans)
  17         (display (list "initialize"
  18                   (ly:context-current-moment
  19                    (ly:translator-context trans)) "\n"))))
  20       (cons 'start-translation-timestep
  21        (lambda (trans)
  22         (display (list "start-trans"
  23                   (ly:context-current-moment
  24                    (ly:translator-context trans)) "\n"))))
  25       (cons 'listeners
  26        (list
  27         (cons 'rest-event (lambda (engraver event)
  28                            (let*
  29                             ((x (ly:engraver-make-grob engraver 'TextScript event)))
  30                             (display (list "caught event" event "\ncreate:\n" x "\n"))
  31                             (ly:grob-set-property! x 'text "hi"))
  32                            ))
  33        ))
  34       (cons 'acknowledgers
  35        (list
  36         (cons 'note-head-interface
  37          (lambda (engraver grob source-engraver)
  38           (display (list "saw head: " grob " coming from " source-engraver))
  39           ))
  40         ))
  41       (cons 'end-acknowledgers
  42        (list
  43         (cons 'beam-interface
  44          (lambda (engraver grob source-engraver)
  45           (display (list "saw end of beam: " grob " coming from " source-engraver))
  46           ))
  47         ))
  48       (cons 'process-music
  49        (lambda (trans)
  50         (display (list "process-music"
  51                   (ly:context-current-moment
  52                    (ly:translator-context trans)) "\n"))))
  53       (cons 'process-acknowledged
  54        (lambda (trans)
  55         (display (list "process-acknowledged"
  56                   (ly:context-current-moment
  57                    (ly:translator-context trans)) "\n"))))
  58       (cons 'stop-translation-timestep
  59        (lambda (trans)
  60         (display (list "stop-trans"
  61                   (ly:context-current-moment
  62                    (ly:translator-context trans)) "\n"))))
  63       (cons 'finalize
  64        (lambda (trans)
  65         (display (list "finalize"
  66                   (ly:context-current-moment
  67                    (ly:translator-context trans)) "\n"))))
  68     )
  69
  70                 }}
  71
  72
  73 \relative c' {
  74   c8[ r c]
  75 }