Re: [Question] How to increment the current bar number

[Malte Meyn]

Am 02.09.18 um 10:10 schrieb address@hidden:
> Hi everyone,
>
> i want to increase the current bar number by a fixed number of steps at 
> a certain point in my sheet music.
>
> To do this, I modify  Score.currentBarNumber. My approach for increasing 
> the bar number by 4 steps would be:
>
> \set Score.currentBarNumber = #(+ Score.currentBarNumber 4)
>
> This does not work however, as GUILE says that currentBarNumber has the 
> value #<unspecified>. So I guess I do not access the currentBarNumber 
> variable in the right way.
>
> But how do I access it in this context?

You have to get the Score context somehow. This can be done by using 
\applyContext. I don’t know what context the procedure then is called 
with (maybe the current Bottom?) but you can find the Score context from 
there and then get and set the currentBarNumber:

\version "2.18.2"

{
  \override Score.BarNumber.break-visibility = #all-visible
  R1*3
  \applyContext
  #(lambda (context)
     (let* ((myscore (ly:context-find context 'Score))
            (curnum (ly:context-property myscore 'currentBarNumber))
            (newnum (+ curnum 4)))
       (ly:context-set-property! myscore 'currentBarNumber newnum)))
  R
}