Hi,
I'm missing a command in LilyPond to include a file only once.
I am working on a general purpose LilyPond library where I am in the
situation that many library files have to access common functions and
therefore have to include the same file (with these helper functions).
Although I assume that it doesn't harm to include a file several times
(I think the functions will just be redefined identically) this looks
like quite undesired behaviour.
I could figure out a Scheme based solution myself and also found some
references to threads on lilypond-user (mainly from 2010). Basically the
idea would be to define a variable in that helper file and subsequently
only include that file if that variable isn't defined already.
But I think that functionality is quite fundamental and should be
supported by LilyPond directly.
Therefore I would like to ask for the following feature:
"Implement a command \includeonce that includes a file just like
\include, but only once.
Like include_once() in PHP or \RequirePackage in LaTeX."
Best
Urs
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