lilypond -H

[Felix Janda]

Hello,

I've seen that lilypond has an option to print out header fields into separate
files. For example "lilypond -H composer piece.ly" will in addition to
compiling the piece put the composer header field (if it exists) into
piece.composer.

It however does only seem to work with the ps/eps/pdf backends. Is that
behavior desired?

What I would like to have is a way to retrieve for example the composer
header field in a short amount of time without having to parse the ly file.

Regards,
Felix