+
+
+(define (parentheses-item::print me)
+ (let*
+ ((elts (ly:grob-object me 'elements))
+ (y-ref (ly:grob-common-refpoint-of-array me elts Y))
+ (x-ref (ly:grob-common-refpoint-of-array me elts X))
+ (stencil (parenthesize-elements me x-ref))
+ (elt-y-ext (ly:relative-group-extent elts y-ref Y))
+ (y-center (interval-center elt-y-ext)))
+
+ (ly:stencil-translate
+ stencil
+ (cons
+ (-
+ (ly:grob-relative-coordinate me x-ref X))
+ (-
+ y-center
+ (ly:grob-relative-coordinate me y-ref Y))))
+ ))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+
+(define-public (chain-grob-member-functions grob value . funcs)
+ (for-each
+ (lambda (func)
+ (set! value (func grob value)))
+ funcs)
+
+ value)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; falls/doits
+
+(define-public (bend::print spanner)
+ (define (close a b)
+ (< (abs (- a b)) 0.01))
+
+ (let*
+ ((delta-y (* 0.5 (ly:grob-property spanner 'delta-position)))
+ (left-span (ly:spanner-bound spanner LEFT))
+ (dots (if (and (grob::has-interface left-span 'note-head-interface)
+ (ly:grob? (ly:grob-object left-span 'dot)))
+ (ly:grob-object left-span 'dot) #f))
+
+ (right-span (ly:spanner-bound spanner RIGHT))
+ (thickness (* (ly:grob-property spanner 'thickness)
+ (ly:output-def-lookup (ly:grob-layout spanner)
+ 'line-thickness)))
+ (padding (ly:grob-property spanner 'padding 0.5))
+ (common (ly:grob-common-refpoint right-span
+ (ly:grob-common-refpoint spanner
+ left-span X)
+ X))
+ (common-y (ly:grob-common-refpoint spanner left-span Y))
+ (left-x (+ padding
+ (max (interval-end (ly:grob-robust-relative-extent
+ left-span common X))
+ (if (and
+ dots
+ (close (ly:grob-relative-coordinate dots common-y Y)
+ (ly:grob-relative-coordinate spanner common-y Y)))
+ (interval-end (ly:grob-robust-relative-extent dots common X))
+ -10000) ;; TODO: use real infinity constant.
+ )))
+ (right-x (- (interval-start
+ (ly:grob-robust-relative-extent right-span common X))
+ padding))
+ (self-x (ly:grob-relative-coordinate spanner common X))
+ (dx (- right-x left-x))
+ (exp (list 'path thickness
+ `(quote
+ (rmoveto
+ ,(- left-x self-x) 0
+
+ rcurveto
+ ,(/ dx 3)
+ 0
+ ,dx ,(* 0.66 delta-y)
+ ,dx ,delta-y
+ )))))
+
+ (ly:make-stencil
+ exp
+ (cons (- left-x self-x) (- right-x self-x))
+ (cons (min 0 delta-y)
+ (max 0 delta-y)))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; grace spacing
+
+
+(define-public (grace-spacing::calc-shortest-duration grob)
+ (let*
+ ((cols (ly:grob-object grob 'columns))
+ (get-difference
+ (lambda (idx)
+ (ly:moment-sub (ly:grob-property
+ (ly:grob-array-ref cols (1+ idx)) 'when)
+ (ly:grob-property
+ (ly:grob-array-ref cols idx) 'when))))
+
+ (moment-min (lambda (x y)
+ (cond
+ ((and x y)
+ (if (ly:moment<? x y)
+ x
+ y))
+ (x x)
+ (y y)))))
+
+ (fold moment-min #f (map get-difference
+ (iota (1- (ly:grob-array-length cols)))))))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; fingering
+
+(define-public (fingering::calc-text grob)
+ (let*
+ ((event (event-cause grob))
+ (digit (ly:event-property event 'digit)))
+
+ (if (> digit 5)
+ (ly:input-message (ly:event-property event 'origin)
+ "Warning: Fingering notation for finger number ~a" digit))
+
+ (number->string digit 10)
+ ))
+
+(define-public (string-number::calc-text grob)
+ (let*
+ ((digit (ly:event-property (event-cause grob) 'string-number)))
+
+ (number->string digit 10)
+ ))
+
+
+(define-public (stroke-finger::calc-text grob)
+ (let*
+ ((digit (ly:event-property (event-cause grob) 'digit))
+ (text (ly:event-property (event-cause grob) 'text)))
+
+ (if (string? text)
+ text
+ (vector-ref (ly:grob-property grob 'digit-names) (1- (max (min 5 digit) 1))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; dynamics
+(define-public (hairpin::calc-grow-direction grob)
+ (if (eq? (ly:event-property (event-cause grob) 'class) 'decrescendo-event)
+ START
+ STOP
+ ))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; lyrics
+
+(define-public (lyric-text::print grob)
+ "Allow interpretation of tildes as lyric tieing marks."
+
+ (let*
+ ((text (ly:grob-property grob 'text)))
+
+ (grob-interpret-markup grob
+ (if (string? text)
+ (make-tied-lyric-markup text)
+ text))))
+
+(define-public ((grob::calc-property-by-copy prop) grob)
+ (ly:event-property (event-cause grob) prop))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; fret boards
+
+(define (string-frets->description string-frets string-count)
+ (let*
+ ((desc (list->vector
+ (map (lambda (x) (list 'mute (1+ x)))
+ (iota string-count)))))
+
+ (for-each (lambda (sf)
+ (let*
+ ((string (car sf))
+ (fret (cadr sf))
+ (finger (caddr sf)))
+
+
+ (vector-set! desc (1- string)
+ (if (= 0 fret)
+ (list 'open string)
+ (if finger
+ (list 'place-fret string fret finger)
+ (list 'place-fret string fret))
+
+
+ ))
+ ))
+ string-frets)
+
+ (vector->list desc)))
+
+(define-public (fret-board::calc-stencil grob)
+ (let* ((string-frets (ly:grob-property grob 'string-fret-finger-combinations))
+ (string-count (ly:grob-property grob 'string-count)))
+
+ (grob-interpret-markup grob
+ (make-fret-diagram-verbose-markup
+ (string-frets->description string-frets string-count)))))