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## Re: context-sensitive or redefinable variables

 From: Jean-Charles Malahieude Subject: Re: context-sensitive or redefinable variables Date: Mon, 24 Oct 2011 19:24:20 +0200 User-agent: Mozilla/5.0 (X11; Linux i686; rv:7.0) Gecko/20110927 Thunderbird/7.0

Le 24/10/2011 12:57, Frederick Bartlett disait :


In setting an a apella SATB piece and the (generated) rehearsal
piano part, I would like to create two PDF files with different
linebreaks.

Each part has many occurrences of a variable "midBarBreak" defined as
{ \bar "" \break } so as to break up the vocal lines at the end of
the lines of the set verse. This works just fine.

Unfortunately, lilypond seems to process variables upon first reading
them, so I can't use the old TeX trick of \let \this \that; nor does
\noexpand have a lilypond cognate that I can find. Nor yet do I see
any way to incorporate logic into the variable (e.g., if in
ChoirStaff, break; if in PianoStaff, ignore). I suspect it's there,
somewhere, but I'm not enough of a schemer to see how to use, e.g.,
ly:context-parent.

So, since TeXish methods don't work, I thought I'd ask if there's a
lilypondish way to do this.



What I do in such a case is using "tags". For more information, have a look at the Notation Reference, 3.3.2 Different editions from one source

http://lilypond.org/doc/v2.14/Documentation/notation/different-editions-from-one-source.html#using-tags

Cheers,
Jean-Charles