Re: How to include a file just once?

[Reinhold Kainhofer]

Am Donnerstag, 21. Januar 2010 19:34:22 schrieb Tim McNamara:
> Without seeing your code, it's hard to tell what the problem is.

The problem is if you have a whole lot of include files, which all depend on 
each other (and thus have to include some other files).

> When using \include to have a set of definitions, it is only
> necessary to do this once per .ly file.  

Yes, but your included file might already include another file

> \version "2.12.2"
> 
> #(ly:set-option 'delete-intermediate-files #t)
[...]
> \include "../../pop-chords.ly"
> \include "../../paren-2.ly"

And now imagine that both of the included files include some other file 
blahblah.ily, which adds or removes some engraver to/from a context. The 
engraver will be added twice, which is a very good way to produce lilypond 
crashes...

I've also thought about preventing double includes with my orchestrallily 
package, but so far I haven't really found a nice solution (but I'm also not 
running into crashes, so it's not urgent for me).

Cheers,
Reinhold
-- 
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org