Re: Parenthesize a group of notes with a square bracket

[Trevor Bača]

On Thu, Oct 3, 2024 at 2:24 PM Matthew Fong <oxen...@gmail.com> wrote:

> Dear LilyPonders,
>
> I've been trying to combine two solutions in the LSR, but I haven't been
> able to figure out how. I want *square brackets* for parenthesizing a group
> of notes
>
> 1/ Parenthesize a group of notes using a Scheme function
> https://lsr.di.unimi.it/LSR/Item?id=902
>
> 2/ Using brackets instead of parentheses for \parenthesize
> https://lsr.di.unimi.it/LSR/Item?id=564
>
> Any advice would be appreciated.
>

Hi Matt,

LSR gives these:

%%% LSR 564 %%%

#(define-public (bracket-stencils grob)
  (let ((lp (grob-interpret-markup grob (markup #:fontsize 3.5 #:translate
(cons -0.3 -0.5) "[")))
        (rp (grob-interpret-markup grob (markup #:fontsize 3.5 #:translate
(cons -0.3 -0.5) "]"))))
    (list lp rp)))

%%% LSR 902 %%%

startParenthesis = {
  \once \override Parentheses.stencils = #(lambda (grob)
        (let ((par-list (parentheses-interface::calc-parenthesis-stencils
grob)))
          (list (car par-list) point-stencil )))
}

endParenthesis = {
  \once \override Parentheses.stencils = #(lambda (grob)
        (let ((par-list (parentheses-interface::calc-parenthesis-stencils
grob)))
          (list point-stencil (cadr par-list))))
}

%%% END %%%

So plugging 564 into 902 maybe looks something like this:

%%% 564 + 902 %%%

\version "2.25.19"

openBracket = {
  \once \override Parentheses.stencils = #(lambda (grob)
        (let ((par-list (*bracket-stencils* grob)))
          (list (car par-list) point-stencil )))
}

closeBracket = {
  \once \override Parentheses.stencils = #(lambda (grob)
        (let ((par-list (*bracket-stencils* grob)))
          (list point-stencil (cadr par-list))))
}

{
  \override Parentheses.font-size = #5
  \once \override Parentheses.extra-offset = #'(-1 . 0)
  \openBracket
  <c \parenthesize c'>
  d' e' f'
  \closeBracket
  \parenthesize
  g'
}

%%% END %%%

[image: square-brackets.png]

HTH,

Trevor.

-- 
Trevor Bača
www.trevorbaca.com
soundcloud.com/trevorbaca