Re: Spanner text in parenthesis on a new system

[David Nalesnik]

Hi Gilberto,

On Sat, Dec 5, 2015 at 5:11 AM, Gilberto Agostinho <address@hidden> wrote:

Hi all,

Is it possible to automatically change the text of a spanner so that if they
last for more than one system they get parenthesized? I would like to apply
this both to the ottava indications as well as for the mixed style of
sustain pedalling (actually we don't show any text at all when Ped. lasts
for more than one system).

It's not difficult to do this for ottava indications.  Below I simply check to see if the left-bound of the spanner is broken.  If it is, I reset the 'text property, and call the print function to use the new value of that property.  Otherwise, we use the default stencil.

 \version "2.18"

\paper {

  ragged-right = ##t

}

{

  \override Staff.OttavaBracket.stencil =

  #(lambda (grob)

     (let ((text (ly:grob-property grob 'text))

           (lb (ly:spanner-bound grob LEFT)))

       (if (= (ly:item-break-dir lb) CENTER)

           (ly:ottava-bracket::print grob)

           (begin

            (set! (ly:grob-property grob 'text)

                  (make-concat-markup (list "(" text ")")))

            (ly:ottava-bracket::print grob)))))

  \ottava #1

  \repeat unfold 100 {

    c'''

  }

}

In the case of the ottava, the parenthesis in a new system are not required,
but some authors do use them. But in the case of the pedalling, it makes the
score much clearer in my opinion. See a faked version created on GIMP below:

<http://lilypond.1069038.n5.nabble.com/file/n184494/18.png>

This is even more evident when there is a page turn in between the systems.

Would that be possible?

Probably.  From my inspection of the code, though, this seems to be a rather bigger enterprise than a modification of OttavaBracket.  This should be tackled in C++, and the code seems awfully convoluted,  I can't put the time in to figuring it out given such sparse comments, though your idea would be useful for my own music.

A first step would be to have an actual SustainPedal grob at the broken left-bound. 

(I'm sure someone could come up with a stencil-replacement which would redraw the bracket to get the parenthesized text, but this would be a lot of trouble for a hack!  I speak from experience: you can see a relevant example at http://www.mail-archive.com/lilypond-user%40gnu.org/msg97099.html)

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