Adding the `Span_bar_engraver` to `ChoirStaff` adds a lot of clutter and results in collisions with the lyrics, which is particularly unappealing with thick repeat bars. This can be quickly fixed by adding `Bar_engraver` to `Lyrics` and hiding them as described in ^[notation lyrics].
However, for aesthetical reasons I prefer removing all span bars, except non-defaults and single bar bars at the end of each line. So this would leave all repeats and double bar lines but no single bars unless there's a line break, much like ^[semi choir staff snippet]
I've found a way to do this, except that there's some spacing issue with the lyrics at single bars that aren't even shown. In choir staves, lyrics can move below a bar line to take up the available space, which leaves a more pleasing appearance and saves space on the page. Sadly, I could either make the lyrics avoid all bar lines or not at all, but not only the ones that are actually shown.
To the point:
I would like to make the lyrics avoid some span bars while not avoiding the bar lines I've omitted using a call back.
To illustrate I've compiled a somewhat minimal example using long words to trigger some collisions. For convenience I've also uploaded it to ^[lilybin].
```lilypond
\version "2.18.2"
link = {
\once \override Score.RehearsalMark.self-alignment-X = #LEFT
\mark \markup \normalsize {
\with-url #"http://lilybin.com/wmw4xx/6" "http://lilybin.com/wmw4xx/6"
}
}
redspn = \once \override Score.SpanBar.color = #red
grnbar = \once \override Score.BarLine.color = #green
notes = {
\link
c1 \redspn | \repeat volta 2 { c | c \grnbar | c } | c | c | c \bar "|."
}
words = \lyricmode {
Breathes | \markup { \with-color #red breathes } |
br | \markup { \with-color #green breathes } |
breathes | br | breathes |
}
\score {
\new ChoirStaff <<
\new Staff \relative c'' \notes \addlyrics \words
\new Staff \relative c'' \notes
>>
\layout {
indent = 0
\context { \ChoirStaff
\consists "Span_bar_engraver"
\override BarLine.after-line-breaking =
#(lambda (grob)
(if
(and (= 0 (ly:item-break-dir grob))
(string=? (ly:grob-property grob 'glyph-name) "|") )
(ly:grob-set-property! grob 'allow-span-bar #f)))
}
% \context { \Lyrics
% \consists "Bar_engraver"
% \hide BarLine
% \override BarLine.after-line-breaking =
% #(lambda (grob)
% (if
% (and (= 0 (ly:item-break-dir grob)))
% (string=? (ly:grob-property grob 'glyph-name) "|")
% (ly:grob-set-property! grob 'stencil #f))
% )
% }
}
}
```
The red colour indicates an unacceptable collision, whereas the green colour indicates the desired loose spacing under bars that are not spanned across staves. The commented-out section removes the relevant bar line stencils from the lyrics, but fails to loosen the spacing where there are no longer any bars to avoid.
Can I conditionally add bar lines to lyrics without otherwise affecting their spacing?
Sorry this got so long, any help would be much appreciated.
Cheers,
Joel
[notation lyrics]: http://lilypond.org/doc/v2.19/Documentation/notation/techniques-specific-to-lyrics#placing-syllables-horizontally
[semi choir staff snippet]: http://lsr.di.unimi.it/LSR/Item?id=299
[lilybin]: http://lilybin.com/wmw4xx/6