Shifting rests breaks beaming

[Peter Crighton]

Hello all,

based on Paul Morris’ restShifter (https://lists.gnu.org/archive/html/lilypond-user/2013-06/msg00088.html), I wrote a function beautifying the vertical placement of rests in a TabStaff. Unfortunately, this does seem to break rests under beams – or rather the beams themselves, they now sort of appear in front of the stave.

This has to do with the use of Rest.before-line-breaking – if I use Rest.after-line-breaking it seems to work, but I don’t really understand what either of them do, and I don’t know if this could break something else. Is using Rest.after-line-breaking the correct way to do this?

\version "2.19.47"

tabRestFix =

#(lambda (grob)

   (let* (

           (dur-log (ly:grob-property grob 'duration-log))

           (dot (ly:grob-object grob 'dot))

           (y-off (ly:grob-property grob 'Y-offset))

           )

     (cond

      ((= dur-log 2)

       (ly:grob-set-property! grob 'Y-offset

         (+ y-off 0.1))

       ))

     (cond

      ((> dur-log 2)

       (ly:grob-set-property! grob 'Y-offset

         (+ y-off -0.25))

       ))

     (cond

      ((= dur-log 4)

       (ly:grob-set-property! grob 'Y-offset

         (+ y-off 0.75))

       ))

     (cond

      ((and (ly:grob? dot)

            (> dur-log 4))

       (ly:grob-set-property! dot 'extra-offset '(0 . -1))

       ))

     ))

\new TabStaff \with {

  \override Rest.before-line-breaking = \tabRestFix

  %\override Rest.after-line-breaking = \tabRestFix

} <<

  \tabFullNotation

  \relative c' {

    c8[ r16 c]

  }

>>

Cheers,

Peter

--
Peter Crighton | Musician & Music Engraver based in Mainz, Germany
http://www.petercrighton.de