Thomas Morley <thomasmorle...@gmail.com> writes:
> I'm ashamed I couldn't figure how to use a function with an optional
> argument for it.
>
> Best I found is:
>
> #(define* (parenthesized-arpeggio #:optional (ctx "Bottom"))
> #{
> \override #ctx . Arpeggio.stencil = #ly:arpeggio::brew-chord-slur
> \override #ctx . Arpeggio.X-extent = #ly:grob::stencil-width
> \revert #ctx . Arpeggio.dash-definition
> #})
>
> But it seems it isn't possible to use it like:
> \parenthesized-arpeggio Staff
> (like a music-function)
>
> @David K, any chance to make it work?
The normal optional argument definition style will work just fine. The
problem is that with the optional argument coming _last_, you cannot
omit it implicitly.
You then have to write \parenthesized-arpeggio \default
which is not really much of a saving as compared to spelling Bottom
out.
--
David Kastrup
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