I would like to *read*, from within a Scheme function
(define-music-function), the values of variables such as
Score.currentBarNumber or Score.alternativeNumberingStyle.
I can have a guess that this is possible with such functions as
ly:context-property or ly:output-def-lookup, but the documentation of
these functions is quite terse.
How is it possible to access these values?
Thanks,
--
Jérôme
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