input/regression/incipit.ly

   1 \version "2.13.4"
   2
   3 \header {
   4   texidoc = "Incipits can be printed using an @code{InstrumentName}
   5 grob."
   6 }
   7
   8 %% to prevent warnings/programming errors:
   9 #(set-object-property! 'music 'backend-type? ly:music?)
  10 #(set-object-property! 'music 'backend-doc "Incipit music")
  11 #(ly:add-interface 'incipit-interface "An incipit." '(music))
  12 #(let* ((instrument-def (assoc 'InstrumentName all-grob-descriptions))
  13         (meta-def (assoc 'meta (cdr instrument-def)))
  14         (interfaces-def (assoc 'interfaces (cdr meta-def)))
  15         (interfaces (cdr interfaces-def)))
  16    (set-cdr! interfaces-def (cons 'incipit-interface interfaces)))
  17
  18 \score {
  19   \new Staff {
  20     %% All this would be shortcuted by an appropriate music function:
  21     \override Staff.InstrumentName #'music = ##{ \clef "petrucci-c1" c'4 d' e' f' #}
  22     \override Staff.InstrumentName #'self-alignment-X = #RIGHT
  23     \override Staff.InstrumentName #'padding = #0
  24     \override Staff.InstrumentName #'stencil =
  25       #(lambda (grob)
  26          (let* ((instrument-name (ly:grob-property grob 'long-text))
  27                 (layout (ly:output-def-clone (ly:grob-layout grob)))
  28                 (music (make-sequential-music
  29                         (list (context-spec-music
  30                                (make-sequential-music
  31                                 (list (make-property-set
  32                                        'instrumentName instrument-name)
  33                                       (make-grob-property-set
  34                                        'VerticalAxisGroup
  35                                        'Y-extent '(-4 . 4))))
  36                                'MensuralStaff)
  37                               (ly:grob-property grob 'music))))
  38                 (score (ly:make-score music))
  39                 (mm (ly:output-def-lookup layout 'mm))
  40                 (indent (ly:output-def-lookup layout 'indent))
  41                 (incipit-width (ly:output-def-lookup layout 'incipit-width))
  42                 (scaled-incipit-width (if (number? incipit-width)
  43                                           (* incipit-width mm)
  44                                           (* indent 0.5))))
  45            (ly:output-def-set-variable! layout 'indent (- indent scaled-incipit-width))
  46            (ly:output-def-set-variable! layout 'line-width indent)
  47            (ly:output-def-set-variable! layout 'ragged-right #f)
  48            (ly:score-add-output-def! score layout)
  49            (set! (ly:grob-property grob 'long-text)
  50                  (markup #:score score))
  51            (system-start-text::print grob)))
  52
  53     %% the instrument name definition is separated:
  54     \set Staff.instrumentName = #"Instrument"
  55     c'4 d' e' f'
  56     g'1
  57   }
  58   \layout {
  59     indent = 5\cm
  60     incipit-width = 3\cm
  61   }
  62 }