+ (if fit-string
+ (begin
+ (delete-free-string fit-string)
+ (set-fret note fit-string))
+ (begin
+ (ly:warning (_ "No open string for pitch ~a")
+ (note-pitch note))
+ (set! unassigned-notes (cons note unassigned-notes)))))
+ (let ((this-fret (calc-fret (note-pitch note) string tuning))
+ (handle-negative
+ (ly:context-property context
+ 'handleNegativeFrets
+ 'recalculate)))
+ (cond ((or (>= this-fret 0)
+ (eq? handle-negative 'include))
+ (begin
+ (delete-free-string string)
+ (set-fret note string)))
+ ((eq? handle-negative 'recalculate)
+ (begin
+ (ly:warning (_ "Requested string for pitch requires negative fret: string ~a pitch ~a") string (note-pitch note))
+ (ly:warning (_ "Ignoring string request."))
+ (set! unassigned-notes (cons note unassigned-notes))))))))))
+ notes defined-strings defined-fingers)
+
+ ;; handle notes without strings assigned
+ (for-each
+ (lambda (note)
+ (let ((fit-string
+ (find (lambda (string)
+ (string-qualifies string (note-pitch note)))
+ free-strings)))
+ (if fit-string
+ (set-fret note fit-string)
+ (ly:warning (_ "No string for pitch ~a (given frets ~a)")
+ (note-pitch note)
+ specified-frets))))
+ (sort unassigned-notes note-pitch>?))
+
+ string-fret-fingering-tuples) ;; end of determine-frets-and-strings
+
+ (define (get-predefined-fretboard predefined-fret-table tuning pitches)
+ "Search through @var{predefined-fret-table} looking for a predefined
+fretboard with a key of @var{(tuning . pitches)}. The search will check
+both up and down an octave in order to accomodate transposition of the
+chords. Returns a placement-list."
+
+ (define (get-fretboard key)
+ (let ((hash-handle
+ (hash-get-handle predefined-fret-table key)))
+ (if hash-handle
+ (cdr hash-handle) ; return table entry
+ '())))
+
+
+
+ ;; body of get-predefined-fretboard
+ (let ((test-fretboard (get-fretboard (cons tuning pitches))))
+ (if (not (null? test-fretboard))
+ test-fretboard
+ (let ((test-fretboard
+ (get-fretboard
+ (cons tuning (map (lambda (x) (shift-octave x 1)) pitches)))))
+ (if (not (null? test-fretboard))
+ test-fretboard
+ (get-fretboard
+ (cons tuning (map (lambda (x) (shift-octave x -1))
+ pitches))))))))
+
+ ;; body of determine-frets
+ (let* ((predefined-fret-table
+ (ly:context-property context 'predefinedDiagramTable))
+ (tunings (ly:context-property context 'stringTunings))
+ (string-count (length tunings))
+ (grob (if (null? rest) '() (car rest)))
+ (pitches (map (lambda (x) (ly:event-property x 'pitch)) notes))
+ (defined-strings (map (lambda (x)
+ (if (null? x)
+ x
+ (ly:event-property x 'string-number)))
+ (car specified-info)))
+ (defined-fingers (map (lambda (x)
+ (if (null? x)
+ x
+ (ly:event-property x 'digit)))
+ (cadr specified-info)))
+ (default-strings (ly:context-property context 'defaultStrings '()))
+ (strings-used (if (and (zero? (entry-count defined-strings))
+ (not (zero? (entry-count default-strings))))
+ default-strings
+ defined-strings))
+ (predefined-fretboard
+ (if predefined-fret-table
+ (get-predefined-fretboard
+ predefined-fret-table
+ tunings
+ pitches)
+ '())))
+ (if (null? predefined-fretboard)
+ (let ((string-frets
+ (determine-frets-and-strings
+ notes
+ strings-used
+ defined-fingers
+ (ly:context-property context 'minimumFret 0)
+ (ly:context-property context 'maximumFretStretch 4)
+ tunings)))
+ (if (null? grob)
+ string-frets
+ (create-fretboard
+ context grob (string-frets->placement-list
+ string-frets string-count))))
+ (if (null? grob)
+ (placement-list->string-frets predefined-fretboard)
+ (create-fretboard context grob predefined-fretboard)))))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; tablature
+
+;; The TabNoteHead tablatureFormat callbacks.
+
+;; Calculate the fret from pitch and string number as letter
+;; The fret letter is taken from 'fretLabels if present
+(define-public (fret-letter-tablature-format
+ context string-number fret-number)
+ (let ((labels (ly:context-property context 'fretLabels)))
+ (make-vcenter-markup
+ (cond
+ ((= 0 (length labels))
+ (string (integer->char (+ fret-number (char->integer #\a)))))
+ ((and (<= 0 fret-number) (< fret-number (length labels)))
+ (list-ref labels fret-number))
+ (else
+ (ly:warning (_ "No label for fret ~a (on string ~a);
+only ~a fret labels provided")
+ fret-number string-number (length labels))
+ ".")))))
+
+;; Display the fret number as a number
+(define-public (fret-number-tablature-format
+ context string-number fret-number)
+ (make-vcenter-markup
+ (format "~a" fret-number)))
+
+;; The 5-string banjo has got a extra string, the fifth (duh), which
+;; starts at the fifth fret on the neck. Frets on the fifth string
+;; are referred to relative to the other frets:
+;; the "first fret" on the fifth string is really the sixth fret
+;; on the banjo neck.
+;; We solve this by defining a new fret-number-tablature function:
+(define-public (fret-number-tablature-format-banjo
+ context string-number fret-number)
+ (make-vcenter-markup
+ (number->string (cond
+ ((and (> fret-number 0) (= string-number 5))
+ (+ fret-number 5))
+ (else fret-number)))))
+
+;; Tab note head staff position functions
+;;
+;; Define where in the staff to display a given string. Some forms of
+;; tablature put the tab note heads in the spaces, rather than on the
+;; lines
+
+(define-public (tablature-position-on-lines context string-number)
+ (let* ((string-tunings (ly:context-property context 'stringTunings))
+ (string-count (length string-tunings))
+ (string-one-topmost (ly:context-property context 'stringOneTopmost))
+ (staff-line (- (* 2 string-number) string-count 1)))
+ (if string-one-topmost
+ (- staff-line)
+ staff-line)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; bar numbers
+
+(define-public ((every-nth-bar-number-visible n) barnum)
+ (= 0 (modulo barnum n)))
+
+(define-public ((modulo-bar-number-visible n m) barnum)
+ (and (> barnum 1) (= m (modulo barnum n))))
+
+(define-public ((set-bar-number-visibility n) tr)
+ (let ((bn (ly:context-property tr 'currentBarNumber)))
+ (ly:context-set-property! tr 'barNumberVisibility
+ (modulo-bar-number-visible n (modulo bn n)))))
+
+(define-public (first-bar-number-invisible barnum) (> barnum 1))
+
+(define-public (all-bar-numbers-visible barnum) #t)
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; percent repeat counters
+
+(define-public ((every-nth-repeat-count-visible n) count context)
+ (= 0 (modulo count n)))
+
+(define-public (all-repeat-counts-visible count context) #t)