Re: Simple scheme function

[Aaron Hill]

On 2020-04-01 3:04 pm, Павел Буданов wrote:
> Hello, I'm newbie in scheme. I want to write simple function to 
> octavize
> melody, but something doesn't works...
>
>
> \version "2.20.0"
> octavize = #(define-music-function
>     (parser location music) (ly:music?)
>     #{ << #music \transpose c c' #music >> #})
>
> music = { c' d' e' f' }
>
> \markup "Need:"
> \new Voice { << \music \transpose c c' \music >> }
> \markup "Got:"
> \new Voice { \octavize \music }

This is a case where the $ is needed over #.  The \transpose ... #music 
is changing the value which affects both usage of #music.  Using $music 
in place of either (or both) #music should fix the issue.

Also, parser and location are no longer required to be specified as 
arguments, so you can shorten up the function definition a bit.


-- Aaron Hill