Re: booleans and conditional compilation?

[Urs Liska]

Am 1. April 2016 21:23:17 MESZ, schrieb Johannes Waldmann <address@hidden>:
>Hi.
>
>Is there a standard way of conditional compilation,
>e.g., to turn parts (on any level) of a score on and off?
>

Yes, look up \tag.

HTH
Urs

>From a programmer's standpoint,
>I'd want booleans, and branching, something like
>
>let foo = true % or false, somewhere at the top of the file,
>               % or even on the command line
>
>% and then (just to show the idea)
>
>...
><<  % (possibly deeply nested)
>  { c d
>  if foo then   e f  else  c d  endif
>  g }
>  { e f
>  if foo then g a else ... endif
>  }
>>>
>
>I know I can define variables,
>and then (un)comment the use of the variables,
>but that does not solve my problem
>because then I had to (un)comment all uses of one variable.
>
>I also know I can just use CPP (external preprocessor).
>However that seems like a work-around because lilypond
>has LISP inside and that sure has booleans and conditionals.
>
>Oh, and I looked up "conditional" in the docs
>(D. LilyPond command index) (no results).
>
>
>... Then I looked it up in the mailing list archive, and found
>https://lists.gnu.org/archive/html/lilypond-user/2012-02/msg00786.html
>
>this seems to indicate that I can only switch named parts:
>$(if foo thing)  seems to require  \thing?
>Then how can I avoid this definition?
>
>
>- J.
>
>Thanks for answers on the "unfold" question.
>
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