- ((process-music trans)
- (let ((col (ly:context-property context 'currentCommandColumn))
- (now (ly:context-property context 'measurePosition))
- (current-bar (ly:context-property context 'currentBarNumber)))
- ; If the counter has been started, make sure we're in a new bar
- ; before finishing a count-spanner and starting a new one.
- ; Since we consider all CommandColumns encountered, we need this
- ; check so that a count-spanner is not created for each pair.
- (if (and (ly:grob? count-spanner)
- (> current-bar last-measure-seen))
- (set! new-measure? #t))
- (if new-measure?
- (begin
- ; Check if we have the first column of the measure.
- ; The possibility of initial grace notes is considered.
- (if (moment<=? now ZERO-MOMENT)
- (begin
- ; If we have the first column, finish the previous
- ; counter-spanner (if there is one).
- (if (ly:grob? count-spanner)
- (begin
- (ly:spanner-set-bound! count-spanner RIGHT col)
- (ly:pointer-group-interface::add-grob count-spanner 'columns col)
- (ly:engraver-announce-end-grob trans count-spanner col)
- (set! count-spanner '())))
- ; if count is over, reset variables
- (if stop?
- (begin
- (set! elapsed 0)
- (set! stop? #f)))
- ; if count is in progress, begin a counter object
- (if go?
- (let* ((c (ly:engraver-make-grob trans 'MeasureCounter col))
- (counter (ly:grob-property c 'count-from)))
- (ly:spanner-set-bound! c LEFT col)
- (ly:pointer-group-interface::add-grob c 'columns col)
- (set! (ly:grob-property c 'count-from) (+ counter elapsed))
- (set! count-spanner c)
- (set! elapsed (1+ elapsed))))
- (set! new-measure? #f)))))
- (set! last-measure-seen current-bar)))
+ ((process-music trans)
+ (let ((col (ly:context-property context 'currentCommandColumn))
+ (now (ly:context-property context 'measurePosition))
+ (current-bar (ly:context-property context 'currentBarNumber)))
+ ;; Each measure of a count receives a new spanner, which is bounded
+ ;; by the first "command column" of that measure and the following one.
+ ;; The possibility of initial grace notes (negative measure position)
+ ;; is considered.
+ (if (and (> current-bar last-measure-seen)
+ (moment<=? now ZERO-MOMENT))
+ (begin
+ ;; Finish the previous count-spanner if there is one.
+ (if (ly:grob? count-spanner)
+ (begin
+ (ly:spanner-set-bound! count-spanner RIGHT col)
+ (ly:pointer-group-interface::add-grob count-spanner 'columns col)
+ (ly:engraver-announce-end-grob trans count-spanner col)
+ (set! count-spanner '())))
+ ;; If count is over, reset variables.
+ (if stop?
+ (begin
+ (set! elapsed 0)
+ (set! stop? #f)))
+ ;; If count is in progress, begin a count-spanner.
+ (if go?
+ (let* ((c (ly:engraver-make-grob trans 'MeasureCounter col))
+ (counter (ly:grob-property c 'count-from)))
+ (ly:spanner-set-bound! c LEFT col)
+ (ly:pointer-group-interface::add-grob c 'columns col)
+ (set! (ly:grob-property c 'count-from) (+ counter elapsed))
+ (set! count-spanner c)
+ (set! elapsed (1+ elapsed))))))
+ (set! last-measure-seen current-bar)))