Re: substitution function variable name

[Jean Abou Samra]

Le 22/01/2023 à 17:20, Darren Ng a écrit :
> Define substitution function accOne() as:
>
>      accOne =
>      #(define-music-function
>          (x        )
>          (ly:music?)
>        #{
>          $x8 $x8 $x8 $x8 $x8
>        #})
>
> Call accOne() with:
>
>      \accOne f
>
> Expected output is:
>
>      f8 f8 f8 f8 f8
>
> However, lilypond reports error as follows:
>
>      GNU LilyPond 2.24.0 (running Guile 2.2)
>      Processing `main.ly'
>      Parsing...
>      accompanimentfunc.ly:19:6: error: Guile signaled an error for the
> expression beginning here
>          $
>           x8 $x8 $x8 $x8 $x8
>      Unbound variable: x8
>      accompanimentfunc.ly:19:10: error: Guile signaled an error for the
> expression beginning here
>          $x8 $
>               x8 $x8 $x8 $x8
>      Unbound variable: x8
>      accompanimentfunc.ly:19:14: error: Guile signaled an error for the
> expression beginning here
>          $x8 $x8 $
>                   x8 $x8 $x8
>      Unbound variable: x8
>      accompanimentfunc.ly:19:18: error: Guile signaled an error for the
> expression beginning here
>          $x8 $x8 $x8 $
>                       x8 $x8
>      Unbound variable: x8
>      accompanimentfunc.ly:19:22: error: Guile signaled an error for the
> expression beginning here
>          $x8 $x8 $x8 $x8 $
>                           x8
>      Unbound variable: x8
>      Interpreting music...
>
> How to tell lilypond to look for variable "x" and make a 1/8 note out of it,
> instead of looking for variable "x8"?



Simply insert a space between "x" and "8".

Best,
Jean

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