search could provide OpenSearch metadata. Various software supports OpenSearch (see the Wikipedia article on OpenSearch); in particular, browsers like Firefox and Iceweasel will automatically discover an OpenSearch search and offer it in the search box.
More specifically, we want to follow the OpenSearch Description Document
standard,
by having a link
with rel="search"
and
type="application/opensearchdescription+xml"
in the headers of HTML, RSS,
and Atom pages. The href
of that link
should point to an
OpenSearchDescription XML file with contents generated based on the
information in ikiwiki.setup
, and the title
attribute of the link
should
contain the wiki title from ikiwiki.setup
.