Re: [Lilypond-auto] Issue 3518 in lilypond: Support temporary divisi staves

[lilypond]

Updates:
        Status: Started

Comment #7 on issue 3518 by address@hidden: Support temporary divisi  
staves
http://code.google.com/p/lilypond/issues/detail?id=3518

> this can't work perfectly due to the rigid structure of our backend.

Speak for yourself; LilyPond's back end had no difficulty considering  
several hypothetical line-breaking possibilities, and figuring which staves  
would be removed in each hypothetical case.  A minor re-arrangement of the  
patch for issue 3024
<http://codereview.appspot.com/13289044> allows the desired output from  
this input:

\paper { #(set-paper-size "a5") indent = 2.0\cm short-indent = 1.0\cm }
%% Would prefer if quoted events could be excluded from keepAliveInterfaces
%% so we would not need to put these commands in the music
letStaffVanish = \set Staff.keepAliveInterfaces = #'()
showStaff = \unset Staff.keepAliveInterfaces

violins = {
    \repeat unfold 128 <c' e'>4
    <<
      \context Staff = "one" { \showStaff
        \repeat unfold 16 <c' g'>4
        \letStaffVanish }
      \context Staff = "two" { \showStaff
        \repeat unfold 16 <g e'>4
        \letStaffVanish}
    >>
    \repeat unfold 112 <c' e'>4 }

\addQuote "violins" \violins

\new StaffGroup \with {
    \consists Keep_alive_together_engraver
    \override VerticalAxisGroup.remove-empty = ##t
  } <<
  \new Staff = "one" \with {
    keepAliveInterfaces = #'()
    \override VerticalAxisGroup.remove-first = ##t
    instrumentName = "Violin 1"
    shortInstrumentName = "V1"
  } \new Voice \quoteDuring "violins" #(skip-of-length violins)
  \new Staff = "two" \with {
    keepAliveInterfaces = #'()
    \override VerticalAxisGroup.remove-first = ##t
    instrumentName = "Violin 2"
    shortInstrumentName = "V2"
  } \new Voice \quoteDuring "violins" #(skip-of-length violins)
  \new Staff \with {
    instrumentName = "Violin 1 & 2"
    shortInstrumentName = "V1&2"
    \override VerticalAxisGroup.keep-alive-alternate = ##t   %%% requires  
the patch
  } \violins >>

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