Urs Liska writes:
> Am 21.03.2013 11:15, schrieb Colin Hall:
>> Urs Liska writes:
>>
>>> Hi,
>>>
>>> I'm missing a command in LilyPond to include a file only once.
>> Michael O'Donnell enquired about this back in 2010:
>>
>> http://lists.gnu.org/archive/html/lilypond-user/2010-01/msg00474.html
>>
>> and there was a long discussion about why one would need this feature.
>>
>> Michael supplied a prototype implementation:
>>
>> http://lists.gnu.org/archive/html/lilypond-user/2010-02/msg00412.html
>>
>> Would you like to take a look at that, Urs, and see if it meets your
>> needs?
>
> Yes, these were the informations I already found.
>
> Basically they meet my needs (or I'd be able to update the approaches to 
> current LilyPond syntax).
>
> Nevertheless I'd vote for a built-in solution with \includeonce.
>
>>
>> I could not locate an existing tracker for this feature, so I'll create
>> one.

Here's a tracker for this new feature \includeonce 

http://code.google.com/p/lilypond/issues/detail?id=3267

I've added a comment to reference Michael O'Donnell's 2010
implementation of \includeIfAbsent.

Cheers,
Colin.

-- 
Colin Hall

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