Re: Bar lines at beginning of a line

[Robin Bannister]

Boris Lau wrote: 
> I thought it would be quite natural if this would do the job:
> \override Staff.BarLine #'break-visibility = #'#(#t #t #t)
> but it doesn't. 

Certainly a reasonable expectation.  
This is normally #'#(#t #t #f), but there are cases when Lilypond 
switches over to #'#(#t #t #t) automatically, as when a 
\repeat volta follows a \break.  
This ensures that the repeat's "|:"  gets printed on the left.

But convention doesn't want regular barlines on the left, and
Lilypond provides them with a sort of aptosis; they are automatically 
zapped before they even reach the break-visibility filter. 


A simple method would be to make the stencil ignore all that:
    
  #(define (always-single-print grob) 
    (set! (ly:grob-property grob 'glyph-name) "|")
    (ly:bar-line::print  grob))
and then     
   \override Staff.BarLine #'stencil = #always-single-print
    
But this ignores repeats, etc too, so maybe it's too simple. 
    
    
Another approach for barlines on the left is to banish the aptosis.  
This is what the attached was-empty.ly tries to do. 
It is rather cumbersome and inflexible, 
but at least it leaves the other barline types unharmed.  


Cheers,
Robin

was-empty.ly
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