Le 25 avr. 2010 à 08:13, Mark Polesky a écrit :
> In both:
> Notation 5.6.1 "Substitution function syntax", and
> Extending 2.1.2 "Simple substitution functions",
>
> it says that variables inside the music block part of a
> music-function definition should be referenced using the
> hash-cash notation (#$), but this clearly doesn't work in
> several significant cases:
>
> \tempo \markup { \bold #$tempotext }
> #$note
>
> In fact, I did an experiment where I took every example from
> these sections, removing the # from every #$, and all the
> examples still compiled fine. Are there any cases where the
> #$ is actually needed? Also, for cases where both #$ and $
> work, is there any reason that omitting the # would be bad
> practice or something? Any additional insights would be
> appreciated too.
Inside the #{ ... #} construct, you have to you #$variable
where a scheme token is required, but you use $variable where
\variable could be used. Behind the scence, $variable is
actually replaced by something like \tmpvar before being parsed.
In your example, in regular LilyPond notation, you can write:
tempotext = "blablah"
and then later use this variable:
\tempo \markup \bold \tempotext
So you can write:
#{ \tempo \markup \bold $tempotext #}
The same way:
music = { c' d' e' }
{ a b \music f' g' }
So you write:
#{ a b $music f' g' #}
The question to answer when in doubt is: can I use a backslashed
variable here?
Nicolas
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