Re: Barline type before \time change

[Jan-Peter Voigt]

Hello Urs,

There are two possibilities:

1.: use a little music-function-helper:
--snip--
\version "2.15.36"

dbtime = #(define-music-function (parser location frac)(fraction?)
  #{
    \bar "||" \time $frac
#})

% example
\relative c' {
  c4 e g b \dbtime 3/4 c des b | c2.
}
--snip--

but this means not using the standard \time command.

2.: If you want to have this effect on existing sources, you might want 
to use a scheme-engraver.
This is based on a snippet, I took from this list ... I think David 
Nalesnik wrote it(?)
--snip--
\version "2.15.36"
% this might work in 2.14 too?

DbBars = #(lambda (context)
          (let ((time-signature '())
                (last-fraction #f))

               `((process-music
                  . ,(lambda (trans)
                          (let ((frac (ly:context-property context 
'timeSignatureFraction)))
                               (if (and (null? time-signature)
                                        (not (equal? last-fraction frac))
                                        (fraction? frac))
                                   (begin
                                     (ly:context-set-property! context 
'whichBar "||")
                                     (set! last-fraction frac)
                          )))
                ))

                (stop-translation-timestep
                  . ,(lambda (trans)
                          (set! time-signature '()))))
))

% example
\score {
  \relative c' {
    c4 e g b \time 3/4 c des b | c2.
  }
  \layout {
    \context {
      \Score
      \consists \DbBars
    }
  }
}
--snip--

With the engraver, you should be able to include an existing file while 
using this custom engraver globally:
--snip--
\layout {
  \context {
    \Score
    \consists \DbBars
  }
}
\include "mymusic.ly"
--snip--

HTH

Cheers, Jan-Peter



On 12.04.2012 16:29, Urs Liska wrote:
> Hello list,
>
> I'm sorry, but I can't find the relevant documentation.
> I want to change lilyPond's default behaviour and tell it to use "||" 
> barlines before \time changes instead of normal ones.
> Although it is quite easy to do this manually, I'd like to know where 
> and how I could change this setting, possibly in a \layout section.
>
> Best
> Urs
>
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