repeating bar numbers and rehearsal marks in frenched score

[Mark Knoop]

Once again further to this thread (see below) I've attempted a patch
(attached) to the Keep_alive_together_engraver which makes this work, at
least for my use case. There might well be a better approach, feedback
would be appreciated.

Possibly the keep-alive-with-id property should be a string (or list)
instead of an integer.

I don't have an account on the issue tracker and so haven't used the
git-cl script.

Regards, Mark

At 11:43 on 26 Jul 2016, Mark Knoop wrote:
>Further to this thread from 2013
>(https://lists.gnu.org/archive/html/lilypond-user/2013-09/msg00857.html)
>I've still not come up with a satisfactory method of duplicating a
>dedicated BarNumber/RehearsalMark context at two or more vertical
>positions in a frenched score. The context should only stay alive only
>while one or more Staff contexts are alive within the same StaffGroup.
>
>I was hoping to solve this by using the newer property
>VerticalAxisGroup.remove-layer introduced by David Kastrup in 2014 as a
>solution for issue 3518. However I can only get this to solve one
>problem - that of making the instrument staves invisible to the
>Keep_alive_together_engraver.
>
>Is there any way that the VerticalAxisGroup.keep-alive-with array can
>be set directly in scheme?
>
>%%%%%%%%%%%%%
>\version "2.19.45"
>bars = \repeat unfold 12 { \mark \default R1*2 }
>winds = \repeat unfold 96 { c''4 }
>brass = \repeat unfold 24 { R1 }
>brasstwo = { \repeat unfold 12 c'1 \repeat unfold 12 { R1 } }
>strings = \repeat unfold 192 { c''8 }
>#(set-global-staff-size 16)
>
>\layout {
>  \context {
>    \Dynamics
>    \consists Mark_engraver
>    \consists Bar_number_engraver
>  }
>  \context {
>    \Staff
>    \RemoveEmptyStaves
>  }
>  \context {
>    \Score
>    \remove Mark_engraver
>    \remove Bar_number_engraver
>  }
>}
>
>\markup "remove-layer unset for all => bars context behaves correctly,
>but b1 staff still alive in 2nd system when we want it dead"
>\score {
>  <<
>    \new Dynamics { \bars }
>    \new Staff = "winds" { \winds }
>    \new StaffGroup \with {
>      \consists Keep_alive_together_engraver
>    } <<
>      \new Dynamics \with {
>        keepAliveInterfaces = #'()
>        \override VerticalAxisGroup.remove-empty = ##t
>        \override RehearsalMark.color = #red
>      } { \bars }
>      \new Staff = "brass" \with {
>        shortInstrumentName = "b1"
>      } { \brass }
>      \new Staff = "brasstwo" \with {
>        shortInstrumentName = "b2"
>      } { \brasstwo }
>    >>  
>    \new Dynamics { \bars }
>    \new Staff = "strings" { \strings }
>  >>  
>}
>
>\markup "remove-layer bars=unset or '() or 1 or #f, b1=#f, b2=#f => b1
>and b2 staves behave correctly, but bars context dies in 2nd system"
>\score {
>  <<
>    \new Dynamics { \bars }
>    \new Staff = "winds" { \winds }
>    \new StaffGroup \with {
>      \consists Keep_alive_together_engraver
>    } <<
>      \new Dynamics \with {
>        keepAliveInterfaces = #'()
>        \override VerticalAxisGroup.remove-empty = ##t
>        \override RehearsalMark.color = #red
>        %\override VerticalAxisGroup.remove-layer = 1
>        %\override VerticalAxisGroup.remove-layer = #'()
>        %\override VerticalAxisGroup.remove-layer = ##f
>      } { \bars }
>      \new Staff = "brass" \with {
>        \override VerticalAxisGroup.remove-layer = ##f
>      } { \brass }
>      \new Staff = "brasstwo" \with {
>        \override VerticalAxisGroup.remove-layer = ##f
>      } { \brasstwo }
>    >>  
>    \new Dynamics { \bars }
>    \new Staff = "strings" { \strings }
>  >>  
>}
>
>--
>Mark Knoop

0001-Keep-a-staff-alive-if-a-staff-with-the-same-id-is-al.patch
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