ly/predefined-fretboards-init.ly

   1 %%%% predefined-fretboard-init.ly
   2 %%%%
   3 %%%% source file of the GNU LilyPond music typesetter
   4 %%%%
   5 %%%% (c) 2008 Carl D. Sorensen <c_sorensen@byu.edu>
   6
   7 \version "2.11.56"
   8
   9 %%%%% define storage structures
  10
  11 % base-chord-shapes is an alist of chord shapes
  12 % in the form of fret-diagram-terse strings with
  13 % scheme symbols as keys.  For convenience, the
  14 % symbols are LilyPond chordmode chord descriptions,
  15 % but that is unnecessary.
  16
  17 #(define base-chord-shapes '())
  18
  19
  20 % music function for adding a chord shape to
  21 % base-chord-shapes
  22
  23 addChordShape =
  24 #(define-music-function (parser location key-symbol shape-string)
  25    (symbol? string?)
  26    "Add chord shape @code{shape-string} to the @code{base-chord-shapes}
  27 alist with the key @code{key-symbol}."
  28    (set! base-chord-shapes
  29            (acons key-symbol shape-string base-chord-shapes))
  30    (make-music 'SequentialMusic 'void #t))
  31
  32 % for convenience, to eliminate storage list in .ly references
  33
  34 #(define (chord-shape shape-code)
  35    (get-chord-shape shape-code base-chord-shapes))
  36
  37 % music function for adding a predefined diagram to
  38 % fretboard-table
  39
  40 storePredefinedDiagram =
  41 #(define-music-function (parser location chord tuning terse-definition)
  42   (ly:music? list? string?)
  43   "Add predefined fret diagram defined by fret-diagram-terse definition
  44 string @code{terse-definition} for the chord pitches @code{chord} and
  45 the stringTuning @code{tuning}."
  46   (let* ((pitches (event-chord-pitches
  47                     (car (extract-named-music chord 'EventChord))))
  48          (hash-key (cons tuning pitches)))
  49   (hash-set! fretboard-table
  50              hash-key
  51              (parse-terse-string terse-definition)))
  52   (make-music 'SequentialMusic 'void #t))
  53