+ '(1.0 . 0.0))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; 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))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; break visibility
+
+(define-public begin-of-line-visible
+ #(#f #f #t))
+(define-public end-of-line-visible
+ #(#t #f #f))
+(define-public end-of-line-invisible
+ #(#f #t #t))
+(define-public spanbar-begin-of-line-invisible
+ #(#t #f #f))
+(define-public all-visible #(#t #t #t))
+(define-public all-invisible #(#f #f #f))
+(define-public begin-of-line-invisible
+ #(#t #t #f))
+(define-public center-invisible #(#t #f #t))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Bar lines.
+
+;;
+;; How should a bar line behave at a break?
+(define bar-glyph-alist
+ '((":|:" . (":|" . "|:"))
+ ("||:" . ("||" . "|:"))
+ ("dashed" . ("dashed" . '()))
+ ("|" . ("|" . ()))
+ ("||:" . ("||" . "|:"))
+ ("|s" . (() . "|"))
+ ("|:" . ("|" . "|:"))
+ ("|." . ("|." . ()))
+
+ ;; hmm... should we end with a bar line here?
+ (".|" . ("|" . ".|"))
+ (":|" . (":|" . ()))
+ ("||" . ("||" . ()))
+ (".|." . (".|." . ()))
+ ("" . ("" . ""))
+ (":" . (":" . ""))
+ ("." . ("." . ()))
+ ("empty" . (() . ()))
+ ("brace" . (() . "brace"))
+ ("bracket" . (() . "bracket"))
+ ))
+
+(define-public (bar-line::calc-glyph-name grob)
+ (let* (
+ (glyph (ly:grob-property grob 'glyph))
+ (dir (ly:item-break-dir grob))
+ (result (assoc glyph bar-glyph-alist))
+ (glyph-name (if (= dir CENTER)
+ glyph
+ (if (and result (string? (index-cell (cdr result) dir)))
+ (index-cell (cdr result) dir)
+ #f)))
+ )
+ glyph-name))
+
+(define-public (bar-line::calc-break-visibility grob)
+ (let* ((glyph (ly:grob-property grob 'glyph))
+ (result (assoc glyph bar-glyph-alist)))
+ (if result
+ (vector (string? (cadr result)) #t (string? (cddr result)))
+ #(#f #f #f))))
+
+
+(define-public (shift-right-at-line-begin g)
+ "Shift an item to the right, but only at the start of the line."
+ (if (and (ly:item? g)
+ (equal? (ly:item-break-dir g) RIGHT))
+ (ly:grob-translate-axis! g 3.5 X)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tuplets
+
+(define-public (tuplet-number::calc-denominator-text grob)
+ (number->string (ly:event-property (event-cause grob) 'denominator)))
+
+(define-public (tuplet-number::calc-fraction-text grob)
+ (let*
+ ((ev (event-cause grob)))
+
+ (format "~a:~a"
+ (ly:event-property ev 'denominator)
+ (ly:event-property ev 'numerator))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Color
+
+(define-public color? list?)
+(define-public (rgb-color r g b) (list r g b))
+
+; predefined colors
+(define-public black '(0.0 0.0 0.0))
+(define-public white '(1.0 1.0 1.0))
+(define-public red '(1.0 0.0 0.0))
+(define-public green '(0.0 1.0 0.0))
+(define-public blue '(0.0 0.0 1.0))
+(define-public cyan '(0.0 1.0 1.0))
+(define-public magenta '(1.0 0.0 1.0))
+(define-public yellow '(1.0 1.0 0.0))
+
+(define-public grey '(0.5 0.5 0.5))
+(define-public darkred '(0.5 0.0 0.0))
+(define-public darkgreen '(0.0 0.5 0.0))
+(define-public darkblue '(0.0 0.0 0.5))
+(define-public darkcyan '(0.0 0.5 0.5))
+(define-public darkmagenta '(0.5 0.0 0.5))
+(define-public darkyellow '(0.5 0.5 0.0))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; key signature
+
+
+(define-public (key-signature-interface::alteration-position step alter c0-position)
+ ;; TODO: memoize - this is mostly constant.
+
+ ;; fes, ges, as and bes typeset in lower octave
+ (define FLAT_TOP_PITCH 2)
+
+ ;; ais and bis typeset in lower octave
+ (define SHARP_TOP_PITCH 4)
+
+ (if (pair? step)
+ (+ (cdr step) (* (car step) 7) c0-position)
+ (let*
+ ((from-bottom-pos (modulo (+ 4 49 c0-position) 7))
+ (p step)
+ (c0 (- from-bottom-pos 4)))
+
+ (if
+ (or (and (< alter 0) (or (> p FLAT_TOP_PITCH) (> (+ p c0) 4)) (> (+ p c0) 1))
+ (and (> alter 0) (or (> p SHARP_TOP_PITCH) (> (+ p c0) 5)) (> (+ p c0) 2))
+ )
+
+ ;; Typeset below c_position
+ (set! p (- p 7)))
+
+ ;; Provide for the four cases in which there's a glitch
+ ;; it's a hack, but probably not worth
+ ;; the effort of finding a nicer solution.
+ ;; --dl.
+ (cond
+ ((and (= c0 2) (= p 3) (> alter 0))
+ (set! p (- p 7)))
+ ((and (= c0 -3) (= p -1) (> alter 0))
+ (set! p (+ p 7)))
+ ((and (= c0 -4) (= p -1) (< alter 0))
+ (set! p (+ p 7)))
+ ((and (= c0 -2) (= p -3) (< alter 0))
+ (set! p (+ p 7))))
+
+ (+ c0 p))))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; accidentals
+
+(define-public (accidental-interface::calc-alteration grob)
+ (ly:pitch-alteration (ly:event-property (event-cause grob) 'pitch)))
+
+
+(define-public cancellation-glyph-name-alist
+ '((0 . "accidentals.natural")))
+
+(define-public standard-alteration-glyph-name-alist
+ '(
+ ;; ordered for optimal performance.
+ (0 . "accidentals.natural")
+ (-1/2 . "accidentals.flat")
+ (1/2 . "accidentals.sharp")
+
+ (1 . "accidentals.doublesharp")
+ (-1 . "accidentals.flatflat")
+
+ (3/4 . "accidentals.sharp.slashslash.stemstemstem")
+ (1/4 . "accidentals.sharp.slashslash.stem")
+ (-1/4 . "accidentals.mirroredflat")
+ (-3/4 . "accidentals.mirroredflat.flat")
+ ))
+
+;; FIXME: standard vs default, alteration-FOO vs FOO-alteration
+(define-public alteration-default-glyph-name-alist standard-alteration-glyph-name-alist)
+
+(define-public makam-alteration-glyph-name-alist
+ '((1 . "accidentals.doublesharp")
+ (8/9 . "accidentals.sharp.slashslashslash.stemstem")
+ (5/9 . "accidentals.sharp.slashslashslash.stem")
+ (4/9 . "accidentals.sharp")
+ (1/9 . "accidentals.sharp.slashslash.stem")
+ (0 . "accidentals.natural")
+ (-1/9 . "accidentals.mirroredflat")
+ (-4/9 . "accidentals.flat.slash")
+ (-5/9 . "accidentals.flat")
+ (-8/9 . "accidentals.flat.slashslash")
+ (-1 . "accidentals.flatflat")
+ ))
+
+(define-public alteration-hufnagel-glyph-name-alist
+ '((-1/2 . "accidentals.hufnagelM1")
+ (0 . "accidentals.vaticana0")
+ (1/2 . "accidentals.mensural1")))
+
+(define-public alteration-medicaea-glyph-name-alist
+ '((-1/2 . "accidentals.medicaeaM1")
+ (0 . "accidentals.vaticana0")
+ (1/2 . "accidentals.mensural1")))
+
+(define-public alteration-vaticana-glyph-name-alist
+ '((-1/2 . "accidentals.vaticanaM1")
+ (0 . "accidentals.vaticana0")
+ (1/2 . "accidentals.mensural1")))
+
+(define-public alteration-mensural-glyph-name-alist
+ '((-1/2 . "accidentals.mensuralM1")
+ (0 . "accidentals.vaticana0")
+ (1/2 . "accidentals.mensural1")))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; * Pitch Trill Heads
+;; * Parentheses
+
+(define-public (parentheses-item::calc-parenthesis-stencils grob)
+ (let* ((font (ly:grob-default-font grob))
+ (lp (ly:font-get-glyph font "accidentals.leftparen"))
+ (rp (ly:font-get-glyph font "accidentals.rightparen")))
+
+ (list lp rp)))
+
+
+(define-public (grob-interpret-markup grob text)
+ (let*
+ ((layout (ly:grob-layout grob))
+ (defs (ly:output-def-lookup layout 'text-font-defaults))
+ (props (ly:grob-alist-chain grob defs)))
+
+ (ly:text-interface::interpret-markup
+ layout props text)))
+
+(define-public (parentheses-item::calc-angled-bracket-stencils grob)
+ (let* (
+ (font (ly:grob-default-font grob))
+ (lp (ly:stencil-aligned-to (ly:stencil-aligned-to (grob-interpret-markup grob (ly:wide-char->utf-8 #x2329))
+ Y CENTER) X RIGHT))
+ (rp (ly:stencil-aligned-to (ly:stencil-aligned-to (grob-interpret-markup grob (ly:wide-char->utf-8 #x232A))
+ Y CENTER) X LEFT))
+ )
+
+ (list (stencil-whiteout lp)
+ (stencil-whiteout rp))))
+
+(define (parenthesize-elements grob . rest)
+ (let*
+ ((refp (if (null? rest)
+ grob
+ (car rest)))
+ (elts (ly:grob-object grob 'elements))
+ (x-ext (ly:relative-group-extent elts refp X))
+ (stencils (ly:grob-property grob 'stencils))
+ (lp (car stencils))
+ (rp (cadr stencils))
+ (padding (ly:grob-property grob 'padding 0.1)))
+
+ (ly:stencil-add
+ (ly:stencil-translate-axis lp (- (car x-ext) padding) X)
+ (ly:stencil-translate-axis rp (+ (cdr x-ext) padding) X))
+ ))
+
+
+(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)))))