Re: Conditionally setting variables in \paper section

[Daniel Thompson]

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On 30/08/13 14:49, David Kastrup wrote:
>> I am trying to modify an shared include file the allow it to
>> switch the score that uses it between A4 "normal" mode and an
>> cut-down A5 form (for an e-book reader).
>> 
>> I can make set-paper-size conditional using a $(if construct but
>> can't find a way to conditionally set the margins. I've
>> constructed a tiny example showing what I have trouble with (it
>> no longer shows my motive but does show my problem).
>> 
>> <snip>
> 
> Well, inside of #{ ... #} there is music by default.  If you want
> to have an output block, you need to place it there.  For me,
> 
> \version "2.16.2" \paper { $(if (ly:get-option 'binder-margins) #{ 
> \paper { left-margin = 20 line-width = 5 } #}) } \score { \relative
> { c4 d e f g a b c } }
> 
> appears to do the trick.

Thanks for the help. That's sorted out my problem.

My paper section now looks as shown below and allows me to switch
between A4 (with binder margins) and an small ebook reader (with very
tight margins).

- --- cut here ---
\paper {
$(if (not (ly:get-option 'afive)) #{
  \paper {
    #(set-paper-size "a4")
    left-margin = 20
    line-width = 180
  }
#}
#{
  \paper {
    #(set-paper-size "a5")
    top-margin = 3
    bottom-margin = 3
    left-margin = 5
    line-width = 140.5
  }
#})

  % Align the first line with everything else
  indent = #0
}
- --- cut here ---


Daniel.

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