Slashes in leadsheets

[Francisco Vila]

Hello,
Does anyone know a way of printing slashes instead of chord names when
a chord is repeated?
It would serve as well to be able to print an arbitrary markup in a
chordnames context, instead of letting lilypond to detect repeated
chords automatically (which it currently does not). Here I am
forwarding a question from our Spanish list.

Thanks!
-- 
Francisco Vila. Badajoz (Spain)
www.paconet.org , www.csmbadajoz.com