This package provides a command to automatically create line extenders for lyrics in melismatic music.
The code is based on work by Knut Petersen and Alexander Kobel, as discussed on the lilypond-dev mailing list.
lyp install auto-extenders
\require "auto-extenders"
...
\new Lyrics {
\autoextenders {
Und die ei- nen _ _ _
}
}
...
For more details, see the included example.