Hi, On Sat, Jul 2, 2016 at 12:49 PM, David Nalesnik <david.nales...@gmail.com> wrote: > Hi Harm, > > On Sat, Jul 2, 2016 at 10:43 AM, Thomas Morley <thomasmorle...@gmail.com> > wrote: >> 2016-07-01 20:43 GMT+02:00 Br. Gabriel-Marie | SSPX <brgabr...@sspx.org>: >>> Because stanza numbers only appear on the first line. Using instrumentName >>> to label verse numbers provides automatic numbering on every line. It >>> wasn't my idea, actually, credit for that goes to Thomas Morley a few >>> issues ago in Vol 163:issue 95. It works quite well. >>> >>> On 7/1/2016 1:30 PM, lilypond-user-requ...@gnu.org wrote: >>>> >>>> Why not use StanzaNumbers instead of instrumentName to label verse >>>> numbers? >> >> >> Meanwhile I tried to make StanzaNumber at every line-begin work, see >> attached. >> Though, it's stacking workarounds, thus pretty expensive. >> At least it _is_ possible, even now. >> Maybe someone steps in futher improving it. > > It is possible to check the break status of the NonMusicalPaperColumn > to the left of the StanzaNumber. This eliminates the need to filter a > list of all grobs on the line. > > First, you need the StanzaNumber's column. Then you can get its left > neighbor (which is needed b/c the stanza's column is a PaperColumn and > won't carry useful break info.). If the neighbor is non-musical and > right-broken, we're at the start of the line. > > &===================== > > #(define (at-line-beginning? grob) > (let* ((col (ly:item-get-column grob)) > (ln (ly:grob-object col 'left-neighbor))) > (not (and (eq? #t (ly:grob-property ln 'non-musical)) > (= 1 (ly:item-break-dir ln)))))) > > #(define (keep-stanza-number-at-line-begin grob) > (if (at-line-beginning? grob) > (ly:grob-suicide! grob))) > > &====================
Sorry, logic fail: #(define (at-line-beginning? grob) (let* ((col (ly:item-get-column grob)) (ln (ly:grob-object col 'left-neighbor)) (col-to-check (if (ly:grob? ln) ln col))) (and (eq? #t (ly:grob-property col-to-check 'non-musical)) (= 1 (ly:item-break-dir col-to-check))))) #(define (keep-stanza-number-at-line-begin grob) (if (not (at-line-beginning? grob)) (ly:grob-suicide! grob))) %%%%%%%%%%%%% This should work with grobs whose column is itself non-musical. So you could do this: \new Staff { \override Staff.Clef.after-line-breaking = #(lambda (grob) (if (at-line-beginning? grob) (set! (ly:grob-property grob 'color) red))) c1 \break c1 \clef bass c1 \break \clef treble c1 } %%%%%%%%%%%%%%%%%%%%%%% Best, DN _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user