Hi.
Is there a standard way of conditional compilation,
e.g., to turn parts (on any level) of a score on and off?
>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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