If that. Is there any suitably licensed text search engine that's worth importing to get a real man page search capability? (Er. Off-topic, followups to tech-userlevel I guess...)
Do you have anything specific in mind? I've been kicking around a grep for -mdoc and -man using the mdoc(3) and man(3) libraries, which are for now only used in building mandoc(1):
src/external/bsd/mdocml/dist/{mdoc,man}.3
One can do things like searching for command flag, function arguments,
etc., by interfacing with manual parse trees. This would only work for
-mdoc, which encodes this stuff; for -man, straight-up text search is
more or less the way to go (the parse tree is just presentation syntax,
although there's some knowledge of context, e.g., section).
Kristaps