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Re: Retrieving information about breaks

From: Urs Liska
Subject: Re: Retrieving information about breaks
Date: Fri, 23 Jan 2015 18:17:01 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

Hi David,

thanks, that works great.
It did *not* write to a file, but that's not the issue here.
The main point is that it listens to implicit break events.

Probably the page breaks are even irrelevant for my case: finding a way to recompile individual systems.

what it doesn't do yet is handle mid-measure breaks, but I know where I can look that up ;-)

So this isn't a feature request anymore ...


Am 23.01.2015 um 17:42 schrieb David Nalesnik:
Hi Urs,

On Fri, Jan 23, 2015 at 9:33 AM, Urs Liska <address@hidden <mailto:address@hidden>> wrote:

    Picking up that old thread seems better than starting a new one ...

    By now I've reached a different state and would like to come back
    to this issue with a very concrete question:
    Is it possible to determine at which positions (in terms of
    barnumber and measure-position) the final line breaks, page breaks
    and page turns have been placed in LilyPond?
    I'm sure this information has to be present at one point, but
    someone (I think it may have been David Nalesnik) expressed the
    opinion that engravers could only access explicit \break-s.

    I would like to write out a log file containing all break points
    of a given LilyPond run.

Here's a routine which will write the line breaks to a file. Have to look into page breaks/turns. (It may be that you need explicit page breaks/turns--then it's possible to read 'page-break-permission and 'page-turn-permission.)

 \version "2.19.15"

%% breaks

#(define out (open-output-file "line-breaks.txt"))

#(define (display-breaks grob)
   (if (and (grob::has-interface grob 'paper-column-interface)
            (eq? #t (ly:grob-property grob 'non-musical)))
       (if (eq? 1 (ly:item-break-dir grob))
           (let* ((location (ly:grob-property grob 'rhythmic-location))
                  (m (car location)))
             (format out "Line beginning at measure ~a~%" m)))
(ly:message "Need NonMusicalPaperColumn grob to determine line breaks.")))

\relative c'' {
\override Score.NonMusicalPaperColumn.after-line-breaking = #display-breaks
  \repeat unfold 30 { c d e f }

Hope this helps--


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