Re: scheme documentation and optional arguments

[Paul Scott]

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Nicolas Sceaux wrote:

>> The newer documentation on music functions 12.1 uses
>> define-music-function instead of define*  Where can I find documentation
>> to make the #:optional once? part above work with define-music-function
>> so I can write some more functions that I want?
> 
> There is not such thing as optional argument in music functions.
> You may do instead:
> 
> textPadding =
> #(define-music-function (parser location padding) (number?)
>    #{ \override TextScript #'padding = #$padding #})
> 
> textPaddingOnce =
> #(define-music-function (parser location padding) (number?)
>    #{ \once \override TextScript #'padding = #$padding #})
> 
> \textPadding #3
> ===
> \override TextScript #'padding = #3
> 
> \textPaddingOnce #3
> ===
> \once \override TextScript #'padding = #3


Thank you!

So I should have looked at music-functions,scm.  :)

Paul
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