Re: Tweak grobs with callback output?

[Trevor Bača]

On Wed, Jul 19, 2023 at 3:41 PM Jean Abou Samra <j...@abou-samra.fr> wrote:

>     \tweak color #(if (equal? DOWN (ly:grob-property grob 'direction)) red
> blue)
>
> You just forgot to wrap the expression in (lambda (grob) ...) .
>

Yes, that's it:

%%% BEGIN %%%

\version "2.25.3"
\markup "Conditionally colors both tuplet brackets:" \markup \vspace #1

{
  \once \override TupletBracket.color = #(lambda (grob)
    (if (equal? DOWN (ly:grob-property grob 'direction)) red blue)
  )
  \times 2/3 {
    \times 2/3 { c'4 c' c' }
    c'2
    c'2
  }
}

\markup "Conditionally colors only the inner tuplet bracket:" \markup
\vspace #1

{
  \times 2/3 {
    \tweak color #(lambda (grob)
        (if (equal? DOWN (ly:grob-property grob 'direction)) red blue))
    \times 2/3 { c'4 c' c' }
    c'2
    c'2
  }
}

%%% END %%%

Thanks very much again, Jean.

Trevor.

-- 
Trevor Bača
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