+
+ "tuplet-note-wrapper": """ % a formatter function, which is simply a wrapper around an existing
+ % tuplet formatter function. It takes the value returned by the given
+ % function and appends a note of given length.
+ #(define-public ((tuplet-number::append-note-wrapper function note) grob)
+ (let* ((txt (if function (function grob) #f)))
+ (if txt
+ (markup txt #:fontsize -5 #:note note UP)
+ (markup #:fontsize -5 #:note note UP)
+ )
+ )
+ )""",
+
+ "tuplet-non-default-denominator": """#(define ((tuplet-number::non-default-tuplet-denominator-text denominator) grob)
+ (number->string (if denominator
+ denominator
+ (ly:event-property (event-cause grob) 'denominator))))
+""",
+
+ "tuplet-non-default-fraction": """#(define ((tuplet-number::non-default-tuplet-fraction-text denominator numerator) grob)
+ (let* ((ev (event-cause grob))
+ (den (if denominator denominator (ly:event-property ev 'denominator)))
+ (num (if numerator numerator (ly:event-property ev 'numerator))))
+ (format "~a:~a" den num)))
+""",
+
+ "compound-time-signature": """%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Formatting of (possibly complex) compound time signatures
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+#(define-public (insert-markups l m)
+ (let* ((ll (reverse l)))
+ (let join-markups ((markups (list (car ll)))
+ (remaining (cdr ll)))
+ (if (pair? remaining)
+ (join-markups (cons (car remaining) (cons m markups)) (cdr remaining))
+ markups))))
+
+% Use a centered-column inside a left-column, because the centered column
+% moves its reference point to the center, which the left-column undoes.
+% The center-column also aligns its contented centered, which is not undone...
+#(define-public (format-time-fraction time-sig-fraction)
+ (let* ((revargs (reverse (map number->string time-sig-fraction)))
+ (den (car revargs))
+ (nums (reverse (cdr revargs))))
+ (make-override-markup '(baseline-skip . 0)
+ (make-number-markup
+ (make-left-column-markup (list
+ (make-center-column-markup (list
+ (make-line-markup (insert-markups nums "+"))
+ den))))))))
+
+#(define-public (format-complex-compound-time time-sig)
+ (let* ((sigs (map format-time-fraction time-sig)))
+ (make-override-markup '(baseline-skip . 0)
+ (make-number-markup
+ (make-line-markup
+ (insert-markups sigs (make-vcenter-markup "+")))))))
+
+#(define-public (format-compound-time time-sig)
+ (cond
+ ((not (pair? time-sig)) (null-markup))
+ ((pair? (car time-sig)) (format-complex-compound-time time-sig))
+ (else (format-time-fraction time-sig))))
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Measure length calculation of (possibly complex) compound time signatures
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+#(define-public (calculate-time-fraction time-sig-fraction)
+ (let* ((revargs (reverse time-sig-fraction))
+ (den (car revargs))
+ (nums (cdr revargs)))
+ (ly:make-moment (apply + nums) den)))
+
+#(define-public (calculate-complex-compound-time time-sig)
+ (let* ((sigs (map calculate-time-fraction time-sig)))
+ (let add-moment ((moment ZERO-MOMENT)
+ (remaining sigs))
+ (if (pair? remaining)
+ (add-moment (ly:moment-add moment (car remaining)) (cdr remaining))
+ moment))))
+
+#(define-public (calculate-compound-measure-length time-sig)
+ (cond
+ ((not (pair? time-sig)) (ly:make-moment 4 4))
+ ((pair? (car time-sig)) (calculate-complex-compound-time time-sig))
+ (else (calculate-time-fraction time-sig))))
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Base beat lenth
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+#(define-public (calculate-compound-base-beat-full time-sig)
+ (let* ((den (map last time-sig)))
+ (apply max den)))
+
+#(define-public (calculate-compound-base-beat time-sig)
+ (ly:make-moment 1 (cond
+ ((not (pair? time-sig)) 4)
+ ((pair? (car time-sig)) (calculate-compound-base-beat-full time-sig))
+ (else (calculate-compound-base-beat-full (list time-sig))))))
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% The music function to set the complex time signature
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+compoundMeter =
+#(define-music-function (parser location args) (pair?)
+ (let ((mlen (calculate-compound-measure-length args))
+ (beat (calculate-compound-base-beat args)))
+ #{
+\once \override Staff.TimeSignature #'stencil = #ly:text-interface::print
+\once \override Staff.TimeSignature #'text = #(format-compound-time $args)
+% \set Staff.beatGrouping = #(reverse (cdr (reverse $args)))
+\set Timing.measureLength = $mlen
+\set Timing.timeSignatureFraction = #(cons (ly:moment-main-numerator $mlen)
+ (ly:moment-main-denominator $mlen))
+\set Timing.beatLength = $beat
+
+% TODO: Implement beatGrouping and auto-beam-settings!!!
+#} ))
+"""