On Fri, Jan 16, 2015 at 4:02 PM, and...@andis59.se <and...@andis59.se> wrote:
> I store two pitches in a pair variable
> x = #'(b . cis')
>
> But then I want to retrieve each one as a pitch in a music-function
> foo = #(define-music-function (parser location bar) (ly:music?)
> (define from (car x))
> (define to (cdr x))
> #{
> \transpose $from $to $bar
> #}
>
> but when I use this
> \foo a
>
> I get Expecting pitch, found (quote b)
>
> So what am I doing wrong and how can I do it right?
>
> // Anders
> PS! The foo function is just a snippet the real function does a bit more...
pitches = #(cons #{ b #} #{ cis' #})
#(display (ly:pitch? (car pitches))) => #t
Notes:
- It needs to be lilypond and not scheme which interprets the pitches.
The #{ #} do that inside a scheme expression.
- It won't work within a quoted list (e.g. #'(#{ b #} . #{ cis' #})
won't get you pitches.)
-----Jay
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