> there might be something there to look at.
In particular, consider the snippet:
\version "2.19"
#(define (append-merge x l r)
"Add x to the head of list l, merging skips,
and if r is true also merging full measure rests."
(if (and (pair? l)
(ly:music? x)
(ly:music? (car l))
(or (and (music-is-of-type? x 'skip-event)
(music-is-of-type? (car l) 'skip-event))
(and r
(music-is-of-type? x 'multi-measure-rest)
(music-is-of-type? (car l) 'multi-measure-rest)))
(not (pair? (ly:music-property (car l) 'articulations))))
(let ((total
(ly:moment-add
(ly:music-duration-length (car l))
(ly:music-duration-length x)
)))
(set! (ly:music-property x 'duration)
(make-duration-of-length total))
(cons x (cdr l)))
(cons x l)))
mergeSkips = #(define-music-function
(parser location rests-also music) ((boolean?) ly:music?)
"Merge successive skips in sequential music,
optionally merge full-measure rests as well."
(music-map
(lambda (m)
(if (music-is-of-type? m 'sequential-music)
(ly:music-set-property! m
'elements
(fold-right (lambda (x l)
(append-merge x l rests-also))
'()
(ly:music-property m 'elements))))
m)
music))
mergeFullBarRests = #(define-music-function
(parser location music) (ly:music?)
#{ \mergeSkips ##t $music #})
music = \context Staff <<
\compressFullBarRests
{ s1*10 \tag #'score \break s1*10 }
{ R1*5 R1*7^\markup\eyeglasses R1*8 }
>>
\keepWithTag #'part \music
\mergeSkips \keepWithTag #'part \music
\mergeFullBarRests \keepWithTag #'part \music
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