Re: Control of score visibility based on variables

[Lukas-Fabian Moser]

Hi Matthew,

> I lifted an idea from your solution. I was looking for the 
> if-statement, and didn't know the syntax for doing so. My 
> solution looks like:
>
> isAmenFPO = ##t
>
> $(if (eq? isAmenFPO #t)
>     #{
>         \score { ...
>         } % end score
>     #}
> )

Perhaps easier with a bit of syntactic sugar:

\version "2.21.80"

myFlag = ##t

scoreIf = #(define-void-function (question? score) (scheme? ly:score?)
   (if question? (add-score score)))

myScore = \score {
  { a4 b }
}

mySecondScore = \score {
  { c' d' }
}

myThirdScore = \score {
  { e' f' }
}

\scoreIf \myFlag \myScore
\scoreIf ##t \mySecondScore

% Compilation toggles every second...

\scoreIf #(even? (current-time)) \myThirdScore

Lukas