Hi Trevor,
hey, that's what I just learned :-)
What you need is (ly:parser-lookup parser 'SopranoMusic) inside a music
function.
Then create the 'SopranoMusic symbol from two strings and you're good to go.
\version "2.19.18"
SopranoMusic = {
c' d'
}
getMusic =
#(define-music-function (parser location label1 label2)
(string? string?)
(ly:parser-lookup parser
(string->symbol
(string-append label1 label2))))
\score {
\new Staff \getMusic "Soprano" "Music"
}
HTH
Urs
Am 21.03.2015 um 23:29 schrieb Trevor Daniels:
LilyPond Schemers,
I'm gradually getting the hang of Scheme, but I'd like some help with one
frustrating issue. I'd like to build an identifier from two strings and use it
to reference a LilyPond variable.
In other words, I have several Lily variables defined like this
SopranoMusic = \relative { ... }
and I'd like to reference them from Scheme code using the strings "Soprano" and
"Music". The only way I've found is to build an alist of all of them using
#(set! index (assoc-set! index "SopranoMusic" SopranoMusic))
and then retrieve the music with
#(define music (assoc-ref index (string-append "Soprano" "Music")))
(In my real-use case of course some of the strings are variables.)
Now while this works it seems rather clunky, so I'm wondering if there is a
more elegant way of doing this. Symbols look like they might help, but so far
I've failed to make anything work. I've also failed with macros, but that's
likely because I don't understand them yet.
TIA, Trevor
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