hi
Marc Hohl wrote:
>
>
> Hello list,
>
> I have some files with songs where I want to switch the slurs on
> and off.
>
> After searching the docs, I came up with this:
>
> optional-slurs.ly
> ==================
>
> \version "2.15.23"
>
> #(ly:add-option 'no-slurs #f
> "Whether to print a slur or not.")
>
> slurSwitch = #(define-music-function (parser location) ()
> (if (eq? #t (ly:get-option 'no-slurs))
> #{ \override Slur #'transparent = ##t #}
> #{#}))
>
> test = {
> \slurSwitch
> c2 ( d )
> }
>
> \score { \test }
>
> ==================
>
> If I call it with
>
> > lilypond optional-slurs.ly
>
> everything is fine; when I use
>
> > lilypind -d no-slurs optional-slurs.ly
>
> I get a warning that option 'no-slurs is
> undefined, and the slurs are still visible.
>
> Searching in the archives showed
>
> http://lists.gnu.org/archive/html/lilypond-devel/2009-11/msg00135.html
> http://lists.gnu.org/archive/html/lilypond-devel/2008-02/msg00080.html
>
> with no apparent solution.
>
>
i am certainly not a scheme expert but from the Application Usage i can see
the option -d expects a variable name and a value:
-dvar=val
if you invoke lilypond with -dvar=#t yourFile.ly you can take over this
value e.g. as
slurSwitch = #(define-music-function (parser location) ()
(if (eqv? #t (ly:get-option 'var))
#{ \override Slur #'transparent = ##t #}
#{ #})
)
test = {
\slurSwitch
c2 ( d )
}
\score { \test }
i'd appreciate scheme experts to confirm this is how to use this option or
to provide better examples!
thanks!
Eluze
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