- printf '%s<a href="#%s">previous</a><a href="#%s">next</a><slide %s' \
- "${tag%<slide *}" "$prev" "$next" "${tag#*<slide }"
+ printf '%s<a class="nextslide" href="#%s">next</a><div class="slide" id="%s" %s' \
+ "${tag%<slide*}" "$next" "$next" "${tag#*<slide}"
+ tag=''
+ ;;
+ *\</slide\>*)
+ printf '%s</div><a class="prevslide" href="#%s">previous</a>%s' \
+ "${tag%</slide>*}" "$prev" "${tag#*</slide>}"
+ tag=''
+ ;;
+ *\<*class=\"uncover\"*\>*)
+ printf '%s<span></span>' "$tag"
+ tag=''
+ ;;
+ *\<body*\>*)
+ printf '%s<a href="#" class="toplevel">overview</a>' "$tag"