[Lilypond-auto] Issue 3267 in lilypond: Feature request includeonce

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement

New issue 3267 by address@hidden: Feature request includeonce
http://code.google.com/p/lilypond/issues/detail?id=3267

Urs Liska submitted a feature request here:

http://lists.gnu.org/archive/html/bug-lilypond/2013-03/msg00099.html

as follows:

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


--
You received this message because this project is configured to send all  
issue notifications to this address.
You may adjust your notification preferences at:
https://code.google.com/hosting/settings