lilypond export

[Jan-Peter Voigt]

Hi list-members,

I have been working on an export module for lilypond. The last month 
there was no time to work on it. So I send you this link despite its 
pre-alpha state, because otherwise the project might fall asleep ;-)

https://github.com/jpvoigt/lilypond-export

It is designed as an openlilylib-plugin so you should clone it next to 
oll-core (if you want to try it) It comes with one example file that 
shows the core commands.

Now, if you import lilypond-export/package.ily you have a command and a 
context-mod in place to export music with or without typesetting it:

music = { ... }
\exportMusic \default xml \music

will export a MusicXML-file <document>.xml in many cases. Well, it is in 
pre-alpha stage, but for example if you have a simple choir piece, it 
should produce a MusicXML-file that can be read by MuseScore.
The other exporter produces Humdrum, that can for example be tested at 
http://verovio.humdrum.org/

The exporter uses some engravers to collect all note-events and store 
them in a tree-structure. The exporter-modules then traverse the tree 
and writes the corresponding strings to the output file. Right now ties 
and slurs are not collected, but lyrics are exported to XML. Beams are 
watched and exported.

This is one first sketch how it should work. There is a lot to do to add 
basics, like ties and slurs, and to make it a stable export module that 
is able to handle complex scores. But I appreciate any feedback and 
maybe someone likes to collaborate?

Best
Jan-Peter