2016-07-26 20:03 GMT+02:00 Urs Liska <[email protected]>:
> Hi all,
>
> one more of my recent confusing ideas: I would like to generate a number of
> \bookpart-s in a Scheme function. The reason is that I have to loop over a
> number of works and create scores for them that are in a bookpart each.
>
> Attached is something that resembles the structure I have in my actual
> files.
>
> I successfully factored out the bookpart to an includable file. With this I
> can produce multiple scores. However, it would be better to have that
> factored out to a function because I have to set some values to select which
> score to create, and this would be more natural to do as function arguments
> rather than setting global variables and reading that from the code that
> generates the scores.
>
> As the files are they compile finely, but when I uncomment the \makeBookpart
> call I get
>
> /home/uliska/Aktuell/lily/bookpart-in-scheme-function/main.ly:23:9: error:
> bad expression type
>
> \makeBookpart
>
> /home/uliska/Aktuell/lily/bookpart-in-scheme-function/main.ly:14:2: error:
> error in #{ ... #}
>
> # (let* errors. Any suggestions how I can make the outer construct handle a
> bookpart returned from a function? Thanks Urs
Not sure I understood what your aiming, but maybe:
\version "2.19.45"
makeBookpart =
#(define-void-function (book)(ly:book?)
(ly:book-add-bookpart!
book
#{ \bookpart { \score { \new Staff { d' } } } #}))
#(let* ((book
#{
\book {
\bookpart { \markup "This will be a title page" }
\include "bookpart.ily"
\include "bookpart.ily"
}
#}))
#{ \makeBookpart #book #}
(ly:book-process
book
#{ \paper {} #} ; non-functional, placeholder
#{ \layout {} #} ; non-functional, placeholder
(ly:parser-output-name)))
HTH,
Harm
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