>> Thanks a lot! However, below you can find one case (using your
>> second, improved version) where it is failing: the key signature at
>> the beginning of a line gets canceled, which is incorrect..
>
> Ofcourse, I should have thought of this.
>
> I'll have a look - my holidays ended, though :(( Not sure when I'm
> able to continue, probably the upcoming weekend
Attached is my solution – in very bad Scheme, I think :-)
The idea is to make `supressRedundantKeySigs' set an `is-redundant'
flag in the redundant grob instead of calling `ly:grob-suicide!'. A
modified stencil function for KeySignature can now check this flag
together with `ly:item-break-dir' to suppress the grob if necessary.
I would be glad if someone could polish the code...
Werner
suppressRedundantTimeSig =
#(lambda (ctx)
(let ((time-sig '()))
`((acknowledgers
(time-signature-interface
. ,(lambda (engraver grob source-engraver)
(set! time-sig (cons grob time-sig)))))
(finalize
. ,(lambda (trans)
(reduce
(lambda (elem prev)
(if (equal? (ly:grob-property elem 'fraction)
(ly:grob-property prev 'fraction))
(begin
(ly:grob-suicide! elem)
prev)
elem))
'()
(reverse time-sig))
(set! time-sig '()))))))
#(set-object-property! 'is-redundant 'backend-type? boolean?)
suppressRedundantKeySig =
#(lambda (ctx)
(let ((key-sig '()))
`((acknowledgers
(key-signature-interface
. ,(lambda (engraver grob source-engraver)
(let* ((cause (ly:grob-property grob 'cause)))
(if (and (ly:stream-event? cause)
(eq? (grob::name grob) 'KeySignature))
(set! key-sig
(cons
(list
grob
(cons (ly:prob-property cause 'tonic)
(ly:prob-property cause 'pitch-alist)))
key-sig)))))))
(finalize
. ,(lambda (trans)
(reduce
(lambda (elem prev)
(if (equal? (cdr elem) (cdr prev))
(begin
(ly:grob-set-property! (car elem) 'is-redundant #t)
elem)
elem))
'()
(reverse key-sig))
(set! key-sig '()))))))
\score {
\relative c' {
\key d \major \time 2/2 d1 |
\key d \major \time 2/2 d1 \break |
\key d \major \time 2/2 d1 |
d1 \break |
\key d \major \time 2/2 d1 |
\key d \minor \time 2/2 d1 |
\key d \minor \time 3/4 d2. |
}
\layout {
\context {
\Score
\consists #suppressRedundantTimeSig
\consists #suppressRedundantKeySig
\override KeySignature.stencil =
#(lambda (grob)
(let* ((is-redundant? (eq? (ly:grob-property grob 'is-redundant) #t))
(at-bol? (eq? (ly:item-break-dir grob) 1)))
(if is-redundant?
(if at-bol?
(ly:key-signature-interface::print grob)
empty-stencil)
(ly:key-signature-interface::print grob))))
}
}
}
% eof
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