Re: "Collect" barnumbers for line and page breaks

[Urs Liska]

Hi David,

thank you for that suggestion.
I'll try to get my mind around this ASAP.
On the first sight I don't understand too much of it. But at least I notice that I'm not afraid of these lambda, let and let* constructs anymore. Finally I'm getting *somewhere* to familiarity with the basic working of Scheme code. What I'm still at a major loss is how Scheme interacts with LilyPond specific functionality. There's really a need for education in that sector.

Best
Urs

Am 10.01.2015 um 20:50 schrieb David Nalesnik:

On Sat, Jan 10, 2015 at 1:39 PM, David Nalesnik <address@hidden> wrote:

 \version "2.19.15"

writeBreaksEngraver =

#(lambda (context)

   (let ((out (open-output-file "output.txt")))

     (make-engraver

      (listeners

       ((line-break-event engraver event)

        (let* ((ccc (ly:context-property context 'currentCommandColumn))

ccc is not used here

It's left over from my attempts to query the NonMusicalPaperColumn grobs in the piece for "break-status" (0 = unbroken, -1 = end-of-line, 1 = beginning-of-line), but break-status always comes back 0.  Try (ly:item-break-dir ccc) to see what I mean.  The conclusion I draw is that useful information about paper columns has not been set when our engraver is operational.

David