beware: this code is very broken
hsg (HTML Slidy Generator) is my fork of Slidy and SlideML. Changes made include switching from XHTML to HTML and rewriting slideml.pl in OpenBSD's ksh. No attempt has been made to keep compatibility with other Bourne-derived shells.
A port to awk was initially tried, but it didn't scale well enough.
To get it, run
$ hg clone http://bitbucket.org/jrick/hsg