Re: currentBarnumber in layout?

[Jean-Charles Malahieude]

Le 21/08/2013 15:05, Thomas Morley disait :
> Hi,
>
> playing around with some code to answer a request about setting
> BarNumber for the first measure at the German lilypond forum
> http://www.lilypondforum.de/index.php?topic=1529.0
> I've found:
>
> \version "2.17.24"
>
> \layout {
>    \context {
>      \Score
>      currentBarNumber = #10
>    }
> }
>
> \new Staff
> \relative c' { \bar "" \repeat unfold 10 { c'1 \break } }
>
> My naive expectation was that _every_ BarNumber would get value 10.
> Though, it works.
>
> Is this a recommended use?
> If yes should it be mentioned somewhere in the docs?

It is mentioned in NR-1.2.5 Bars (unnumbered "Bar numbers").

Very useful with vocal materials where, for instance, the count is reset 
on an act basis.

What I usually do is setting the counter in a global variable,
like this:

%% Act I - 6 military symphony
global = {
  \time 3/4
  \key c \major
  \set Score.currentBarNumber = #210
  \skip 2. * 35 \bar "||"
}

Cheers,
Jean-Charles