Cabal documentation

[C W Rose]

The current Cabal package documentation is in some form of markup language,
and I'd like to convert that to HTML.  I suspect that Haddock is the
preferred approach, but Haddock doesn't seem to recognise the file format.
Is there anyway, short of hand editing, to convert these files (which have
a .markup extension) to HTML?  Just building the package doesn't work.

Thanks - Will