At 20:18 on 16 Aug 2016, Mark Knoop wrote:
>At 12:13 on 16 Aug 2016, tisimst wrote:
>>A great example (better and more likely to happen than mine)! Maybe
>>you'll be able to check this item off you wish-list soon!  
>
>Thanks both for those. I probably won't do anything on this for the
>next couple of days, so feel free to add more thoughts if you have
>them. 

The attached goes some way towards addressing both Kieren's carol and
Abraham's horn problems. Note this is really just an expansion of the
divisi-staves example and works with current lilypond (without my
patch). 

Could you both take a look at this and see (a) if it helps, and (b)
what else needs to be achieved. 

-- 
Mark Knoop
\version "2.19.45"
targetstaff = #(define-scheme-function
  (ctx) (string?)
  #{
    \set Staff.keepAliveInterfaces = #'()
    \context Staff = #ctx { \unset Staff.keepAliveInterfaces }
  #})
sopnotes = \relative c'' {
  \targetstaff #"tutti"
  c1 1 1 1 \break
  \targetstaff #"sopalt"
  c4-- d e f g f e d c1 R1 \break
  \targetstaff #"sop"
  \repeat unfold 8 { c8 e g e } \break
  \targetstaff #"sopalt"
  c4 d e f g f e d c1 \break
  c4 d e f g f e d c1 R1
  \bar "|."
}
altnotes = \relative g' {
  \targetstaff #"tutti"
  g1 1 1 1
  \targetstaff #"sopalt"
  c4 d e f g f e d c1 R1
  \targetstaff #"alt"
  \repeat unfold 8 { c,8 e g e }
  \targetstaff #"sopalt"
  c4 d e f g f e d c1
  c4 d e f g f e d c1 R1
}
tennotes = \relative e' {
  \targetstaff #"tutti"
  e1 1 1 1
  \targetstaff #"tenbas"
  c4 d e f g f e d c1 R1
  \targetstaff #"ten"
  \repeat unfold 28 { c8 e }
  \targetstaff #"tutti"
  R1*4
}
basnotes = \relative c' {
  \targetstaff #"tutti"
  c1 1 1 1
  \targetstaff #"tenbas"
  c4 d e f g f e d c1 R1
  \targetstaff #"bas"
  \repeat unfold 28 { e,8 g }
  \targetstaff #"tutti"
  R1*4
}

\layout {
  short-indent = 8
  \context {
    \StaffGroup
    \consists Keep_alive_together_engraver
  }
  \context {
    \Staff
    \override VerticalAxisGroup.remove-first = ##t
    \override VerticalAxisGroup.remove-empty = ##t
  }
}

\score {
  \new StaffGroup <<
    \new Staff = "tutti" \with {
      instrumentName = "SATB"
      shortInstrumentName = "SATB"
      \override VerticalAxisGroup.remove-first = ##f
      \override VerticalAxisGroup.remove-empty = ##f
      \override VerticalAxisGroup.remove-layer = 3
    } <<
      \new Voice { \voiceOne \partcombine \sopnotes \altnotes }
      \new Voice { \voiceTwo \partcombine \tennotes \basnotes }
    >>
    \new Staff = "sopalt" \with {
      instrumentName = "SA"
      shortInstrumentName = "SA"
      \override VerticalAxisGroup.remove-layer = 2
    } \partcombine \sopnotes \altnotes
    \new Staff = "sop" \with {
      instrumentName = "S"
      shortInstrumentName = "S"
      \override VerticalAxisGroup.remove-layer = 1
    } \sopnotes
    \new Staff = "alt" \with {
      instrumentName = "A"
      shortInstrumentName = "A"
      \override VerticalAxisGroup.remove-layer = 1
    } \altnotes
    \new Staff = "tenbas" \with {
      instrumentName = "TB"
      shortInstrumentName = "TB"
      \override VerticalAxisGroup.remove-layer = 2
    } \partcombine \tennotes \basnotes
    \new Staff = "ten" \with {
      instrumentName = "T"
      shortInstrumentName = "T"
      \override VerticalAxisGroup.remove-layer = 1
    } \tennotes
    \new Staff = "bas" \with {
      instrumentName = "B"
      shortInstrumentName = "B"
      \override VerticalAxisGroup.remove-layer = 1
    } \basnotes
  >>
}
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