Re: building pairs in music functions

[Kevin Barry]

Thank you both that worked perfectly!

On Fri, Mar 13, 2015 at 10:54 AM, Pierre Perol-Schneider <address@hidden> wrote:

Hi Kevin,

See: http://www.lilypond.org/doc/v2.18/Documentation/extending/intermediate-substitution-functions.html

So:
...

\once \override HorizontalBracket.bracket-flare = #(cons num num)

...

should work.

HTH,

Pierre

2015-03-13 11:33 GMT+01:00 Kevin Barry <address@hidden>:

Dear scheme experts,

I am trying to supply a constructed pair as a value for a grob property in a music function, but it seems no matter what I try I get an error such as: `warning: type check for `bracket-flare' failed; value `(num . num)' must be of type `pair of numbers''. A non-working example is pasted below. In addition to the code below, I also tried binding the variables in advance with let* and I tried constructing the pair with cons. I even tried binding a value to the constructed pair, but everything returned the same error. Please help!

Kevin

\version "2.18.2"

rotateBracket =

#(define-music-function (parser location num)

  (number?)   

  #{

  \once \override HorizontalBracket.bracket-flare = #'(num . num)

  #})

\relative {

  \rotateBracket #1

  b\startGroup b\stopGroup

}

\layout {

  \context {

    \Voice

    \consists "Horizontal_bracket_engraver"

  }

}

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