Ope- I found where I got it:
https://lists.gnu.org/archive/html/lilypond-user/2020-08/msg00171.html
On Sat, Dec 23, 2023 at 1:09 PM Jon Arnold <jonarnoldsem...@gmail.com>
wrote:
> I'm not sure where I found it, but the file that I have is slightly
> different. It's worked well for me.
>
> Here's the content:
>
>> \version "2.20.0"
>>
>> #(define (conditional-kill-lyric-extender-callback . args)
>> (lambda (grob)
>> (let* ((orig (ly:grob-original grob))
>> (siblings (ly:spanner-broken-into orig))
>> (minimum-length
>> (if (null? args)
>> (ly:grob-property grob 'minimum-length 0)
>> (car args)))
>> (X-extent (ly:stencil-extent (ly:grob-property grob 'stencil
>> empty-stencil) X))
>> (natural-length (- (cdr X-extent) (car X-extent))))
>> (if (and (> minimum-length natural-length)
>> (<= (length siblings) 1)) ;; never kill a broken extender
>> (ly:grob-suicide! grob)))))
>>
>> \layout {
>> \context {
>> \Lyrics
>> \override LyricExtender.minimum-length = #1
>> \override LyricExtender.after-line-breaking =
>> #(conditional-kill-lyric-extender-callback)
>> }
>> }
>>
>> autoextenders =
>> #(define-music-function (lyrics) (ly:music?)
>> (let* ((has-hyphen?
>> (lambda (event)
>> (let* ((art (ly:music-property event 'articulations))
>> (is-hyphen? (lambda (ev) (eq? (ly:music-property ev
>> 'name) 'HyphenEvent))))
>> (find is-hyphen? art))))
>> (has-extender?
>> (lambda (event)
>> (let* ((art (ly:music-property event 'articulations))
>> (is-hyphen? (lambda (ev) (eq? (ly:music-property ev
>> 'name) 'ExtenderEvent))))
>> (find is-hyphen? art))))
>> (add-extender!
>> (lambda (event)
>> (ly:music-set-property! event 'articulations
>> (append (ly:music-property event 'articulations) (list
>> (make-music 'ExtenderEvent))))
>> event)))
>> (music-map
>> (lambda (event)
>> (if (and (eq? (ly:music-property event 'name) 'LyricEvent)
>> ; do not add extenders below hyphens
>> (not (has-hyphen? event))
>> ; do not duplicate extenders
>> (not (has-extender? event))
>> ; do not add additional extenders after _ (internally
>> equivalent to " ")
>> ; to avoid killed extenders
>> (not (equal? (ly:music-property event 'text) " "))
>> ; do not add extenders after "" to allow ending extenders
>> ; within _ _ _ _ skip sequences with _ _ "" _ _
>> (not (equal? (ly:music-property event 'text) ""))
>> ; ditto, with _ _ \markup{|null} _ _
>> (not (equal? (ly:music-property event 'text) (markup
>> #:null)))
>> )
>> (add-extender! event))
>> event)
>> lyrics)))
>>
>> #(set! toplevel-music-functions
>> (cons (lambda (music) (autoextenders music))
>> toplevel-music-functions))
>>
>
> On Sat, Dec 23, 2023 at 10:39 AM Werner LEMBERG <w...@gnu.org> wrote:
>
>>
>> > Often, multiple voices in a score have the same lyrics, or the
>> > lyrics have repeating components (such as lines from a poem). Is
>> > there a way to automatically add extender lines to melismata in the
>> > lyrics?
>>
>> Examples, please, both a scan from a real-world example, and ideally
>> some LilyPond code that demonstrates how you want to do it.
>>
>> Have you already checked our issues database? Maybe the problem is
>> already filed.
>>
>> https://gitlab.com/lilypond/lilypond/-/issues
>>
>>
>> Werner
>>
>>
