86 lines
2.7 KiB
Plaintext
86 lines
2.7 KiB
Plaintext
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%% http://lsr.dsi.unimi.it/LSR/Item?id=336
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%% see also http://code.google.com/p/lilypond/issues/detail?id=1228
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%% Usage:
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%% \new Staff \with {
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%% \override RestCollision.positioning-done = #merge-rests-on-positioning
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%% } << \somevoice \\ \othervoice >>
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%% or (globally):
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%% \layout {
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%% \context {
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%% \Staff
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%% \override RestCollision.positioning-done = #merge-rests-on-positioning
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%% }
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%% }
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%%
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%% Limitations:
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%% - only handles two voices
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%% - does not handle multi-measure/whole-measure rests
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#(define (rest-score r)
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(let ((score 0)
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(yoff (ly:grob-property-data r 'Y-offset))
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(sp (ly:grob-property-data r 'staff-position)))
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(if (number? yoff)
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(set! score (+ score 2))
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(if (eq? yoff 'calculation-in-progress)
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(set! score (- score 3))))
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(and (number? sp)
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(<= 0 2 sp)
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(set! score (+ score 2))
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(set! score (- score (abs (- 1 sp)))))
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score))
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#(define (merge-rests-on-positioning grob)
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(let* ((can-merge #f)
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(elts (ly:grob-object grob 'elements))
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(num-elts (and (ly:grob-array? elts)
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(ly:grob-array-length elts)))
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(two-voice? (= num-elts 2)))
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(if two-voice?
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(let* ((v1-grob (ly:grob-array-ref elts 0))
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(v2-grob (ly:grob-array-ref elts 1))
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(v1-rest (ly:grob-object v1-grob 'rest))
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(v2-rest (ly:grob-object v2-grob 'rest)))
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(and
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(ly:grob? v1-rest)
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(ly:grob? v2-rest)
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(let* ((v1-duration-log (ly:grob-property v1-rest 'duration-log))
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(v2-duration-log (ly:grob-property v2-rest 'duration-log))
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(v1-dot (ly:grob-object v1-rest 'dot))
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(v2-dot (ly:grob-object v2-rest 'dot))
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(v1-dot-count (and (ly:grob? v1-dot)
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(ly:grob-property v1-dot 'dot-count -1)))
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(v2-dot-count (and (ly:grob? v2-dot)
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(ly:grob-property v2-dot 'dot-count -1))))
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(set! can-merge
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(and
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(number? v1-duration-log)
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(number? v2-duration-log)
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(= v1-duration-log v2-duration-log)
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(eq? v1-dot-count v2-dot-count)))
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(if can-merge
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;; keep the rest that looks best:
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(let* ((keep-v1? (>= (rest-score v1-rest)
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(rest-score v2-rest)))
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(rest-to-keep (if keep-v1? v1-rest v2-rest))
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(dot-to-kill (if keep-v1? v2-dot v1-dot)))
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;; uncomment if you're curious of which rest was chosen:
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;;(ly:grob-set-property! v1-rest 'color green)
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;;(ly:grob-set-property! v2-rest 'color blue)
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(ly:grob-suicide! (if keep-v1? v2-rest v1-rest))
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(if (ly:grob? dot-to-kill)
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(ly:grob-suicide! dot-to-kill))
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(ly:grob-set-property! rest-to-keep 'direction 0)
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(ly:rest::y-offset-callback rest-to-keep)))))))
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(if can-merge
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#t
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(ly:rest-collision::calc-positioning-done grob))))
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generalLayout = \layout {
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\generalLayout
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\context {
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\Staff
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\override RestCollision.positioning-done = #merge-rests-on-positioning
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}
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}
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