Re: Create a bookpart with a scheme function

[Timothy Lanfear]

On 18/11/16 08:47, Freddy Ouellette wrote:
> Still a little confused about how to dynamically create a bookpart:
>
> \version "2.18.2"
>
> freddy = \bookpart {
>   \score {
>     \new Staff {
>       c d e f g
>     }
>   }
> }
>
> full_scores = \book {
>
> }
>
> #(ly:book-add-bookpart! full_scores freddy)
>
> \full_scores
>
>
> this doesn't seem to work.
>
> C:/Program Files
> (x86)/LilyPond/usr/share/lilypond/current/scm/lily-library.scm:242:5: In
> procedure ly:book-process in expression (process-procedure book paper ...):
>
> C:/Program Files
> (x86)/LilyPond/usr/share/lilypond/current/scm/lily-library.scm:242:5:
> Wrong type (expecting real number): #<undefined>
>
>
> Freddy

This will create a book "full_scores", add the "freddy" bookpart to 
"full_scores" and process the resulting book.

\version "2.18.2"

freddy = \bookpart {
  \score {
    \new Staff {
      c d e f g
    }
  }
}

#(begin
 (let ((full_scores (ly:make-book $defaultpaper $defaultheader)))
   (ly:book-add-bookpart! full_scores freddy)
   (ly:book-process full_scores $defaultpaper $defaultlayout "freddy")))

Tim Lanfear