David Kastrup wrote:
>> I'm trying to write a conditional version of the \transpose
>> function, that would work something like this...
>>
>> input = {
>> c c
>> \conditionalTransposition c c' { c c }
>> }
>>
>> \input
>> => { c c c c }
>>
>> \processConditionalTransposition \input
>> => { c c c' c' }
>
> conditionalTransposition =
> #(define-music-function (parser location from to music)
> (ly:pitch? ly:pitch? ly:music?)
> (set! music #{ \transpose c' c' #music #})
> (set! (ly:music-property 'from-to music) (cons from to))
> music)
>
> processConditionalTransposition =
> #(define-music-function (parser location music) (ly:music?)
> (map-some-music
> (lambda (m)
> (and (music-is-of-type? m 'transposed-music)
> (pair? (ly:music-property m 'from-to music))
> #{ \transpose #(car (ly:music-property m 'from-to-music))
> #(cdr (ly:music-property m 'from-to-music))
> #(ly:music-property m 'element)
> #}))
> music))
David,
sorry for the delayed response. Your solution is excellent!
I'm learning so much from you.
Thanks again.
- Mark
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