Hi Urs,
On Sat, Jan 10, 2015 at 8:44 AM, Urs Liska <u...@openlilylib.org> wrote:
> Hi list,
>
> is it possible to collect the measure/measure-position values of all
> breaks in a compilation and output that to a logfile?
>
Yes, it is possible. As far as I can tell, though, an engraver only has
access to explicit line- and page-breaks. I could be wrong, and I hope I
am!
The following engraver will write line- and page-break info to the file
"output.txt" in the format (measure . measure-position). Nothing will be
output for files that don't contain \break or \pageBreak.
\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))
(m (ly:context-property context 'currentBarNumber))
(mpos (ly:context-property context 'measurePosition))
(loc (cons m mpos)))
(format out "Line break at ~a~%" loc)))
((page-break-event engraver event)
(let* ((ccc (ly:context-property context 'currentCommandColumn))
(m (ly:context-property context 'currentBarNumber))
(mpos (ly:context-property context 'measurePosition))
(loc (cons m mpos)))
(format out "Page break at ~a~%" loc))))
((finalize trans)
(close-output-port out)))))
{
c'1
\break
c'1
\break
c'1
\pageBreak
c'1
\break
}
\layout {
\context {
\Score
\consists \writeBreaksEngraver
}
}
>
> As mentioned yesterday I found a way to ask LilyPond to compile only a
> portion of a score by passing a range of measures.
> And if I had a generated list of all current breaks I could ask LilyPond
> to recompile just the staff (or page) I'm currently working on.
> Eventually this could be extended with the help of outputting single files
> for systems (à la lilypond-book-preamble). I think of having Frescobaldi
> display not a usual engraved PDF but concatenate these individual system
> images. Then the autocompile function could be used to only autocompile the
> "current" system - which would be a huge improvement in terms of
> responsiveness.
>
> As mentioned in my post a few minutes ago I haven't understood yet how
> engravers, listeners and friends actually work so I'd need some starters to
> get me going.
>
> TIA
> Urs
>
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>
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