Re: Colors in alists

[Urs Liska]

Am 05.11.2014 00:02, schrieb Thomas Morley:
> 2014-11-04 19:05 GMT+01:00 Urs Liska <address@hidden>:
> > Am 04.11.2014 15:47, schrieb Jay Anderson:
> > > On Tue, Nov 4, 2014 at 3:48 AM, Urs Liska <address@hidden> wrote:
> > > > I want to store colors in an alist like
> > > >
> > > > #(define types
> > > > '(("one" . "red")
> > > > ("two" . "blue")))
> > > >
> > > > I can retrieve and display the values with assoc-ref but I don't know how
> > > > to
> > > > turn the returned string into a color to be used in an override.
> > > Try quasiquote + unquote:
> > >
> > > #(define types
> > >     `(("one" . ,red)
> > >       ("two" . ,blue)))
> > >
> > > #(display types) => ((one 1.0 0.0 0.0) (two 0.0 0.0 1.0))
> > >
> > > -----Jay
> >
> > Hi Jay,
> >
> > thanks, that was it. Still a mystery, this all ...
> >
> > I would be extremely happy if someone could take the time and write a
> > slow-paced tutorial about this on Scores of Beauty!
> >
> > Best
> > Urs
> >
> >
> > _______________________________________________
> > lilypond-user mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/lilypond-user
> As others pointed out it's a matter of quote/unquote/quasiquote,
> though for completeness, there is some lilypond function which can
> make your initial approach work:
>
>
> #(define clrs
> '(("one" . "red")
>    ("two" . "blue")))
>
> #(display (color? (x11-color (assoc-get "one" clrs))))
> #(display (x11-color (assoc-get "one" clrs)))
>
>
> Cheers,
>    Harm

Thanks for that hint. I *did* try that function but only in the 
definition, where it didn't work.

Urs