Re: Conditional runs

[Karl Hammar]

Karl:
> I try to do conditional lilypond runs. I can do that by having different 
> files which includes the common parts, but I'd like to have just one
> source file and specify which version to use (in my case, mostly different
> page sizes). So I'm trying out the #(if (defined ..)) construct.
...
> 2, what is "lilypond -e '...' meant to be used for?

  Reading the manual [1]..., I read that I need use-mudules:

$ cat test.ly
#(use-modules (guile-user))
\version "2.13.0"

%#(if (eqv? #t (ly:get-option 'flag))
#(if (defined? 'flag)
  (display "\n\tYes!\n")
  (display "\n\tNo!\n")
)
$ lilypond -e '(define flag "a")' test.ly
GNU LilyPond 2.13.0
Processing `test.ly'
Parsing...WARNING: #f: imported module (guile-user) overrides core binding 
`%module-public-interface'

        Yes!
$

  Is that warning simply stating an obvious fact, or is there a problem?

Regards,
/Karl

[1] 
http://www.lilypond.org/doc/v2.13/Documentation/usage/command_002dline-usage#Command-line-options-for-lilypond

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Karl Hammar                    Aspö Data               address@hidden
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