Hi,
On Fri, May 18, 2012 at 3:40 PM, Kieren MacMillan <
[email protected]> wrote:
> p.s.
>
> Come to think of it, wouldn't this be a good place for a Scheme engraver
> [written by someone who, unlike me, knows Scheme well]? To wit, if the
> measures in a piece aren't all 4/4, then our suggestion(s) won't work; and
> every time the total number of measures changes you need to update; etc.
>
> Couldn't there just be an engraver that says, “If I'm the k-th barline
> since the last system break, then break, otherwise noBreak”, that could be
> \consists-ed into the \Score?
>
I can't believe that this works :) !!
\version "2.15.38"
#(define bars-per-line 4)
#(define line-break-every-nth-engraver
(lambda (context)
(make-engraver
(acknowledgers ((paper-column-interface engraver grob
source-engraver)
(let ((current-bar (ly:context-property context 'currentBarNumber)))
(if (= (remainder current-bar bars-per-line) 1)
(if (eq? #t (ly:grob-property grob 'non-musical))
(set! (ly:grob-property grob 'line-break-permission) 'force)
(set! (ly:grob-property grob 'line-break-permission) '())))))))))
\relative c' {
\repeat unfold 10 {
\time 2/4
c4 c
\time 4/4
c c c c
\time 3/4
c c c
\time 1/4
c
\time 5/4
c c c c c
\time 7/4
c c c c c c c
\time 2/4
c c
\time 7/8
c8 c c c c c c
\time 2/2
c2 c
}
}
\layout {
\context {
\Score
%% the following line necessary if you want to put more
%% measures to a line than Lily wants to allow
\override NonMusicalPaperColumn #'line-break-permission = ##f
\consists #line-break-every-nth-engraver
}
}
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