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List:       lilypond-user
Subject:    Re: Is it possible to replace a number with variable inside a pair?
From:       David Kastrup <dak () gnu ! org>
Date:       2018-07-26 8:28:40
Message-ID: 87y3dy9z9j.fsf () fencepost ! gnu ! org
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Jan-Peter Voigt <jp.voigt@gmx.de> writes:

> Hi Risto,
>
> you might go this way:
>
> lineThickness = 5
> \markup \override #`(thickness . ,lineThickness) \draw-hline
>
> That is semi-quote the pair with ` (instead of ') and then "unquote" the
> variable to retrieve the value with a comma (,)

Which is equivalent to

\markup \override #(cons 'thickness lineThickness) \draw-hline

Either will create a pair at "runtime" rather than directly in the
"Scheme reader" which does not access variables but rather creates
symbols when given an identifier.

-- 
David Kastrup

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