[Mediawiki-l] Hook for use of "Go" button?

[Daniel Barrett]

In an extension, I'd like to detect when the "Go" button has been used to jump directly to an article that exists.  Any ideas how to do this?  Here is what I have tried so far:

-       The Special:Search page (file specials/SpecialSearch.php) does an immediate redirect to the target, with no hook provided.
-       There is a hook SpecialSearchNogomatch that detects the use of the "Go" button but only when the target doesn't exist.  That's the opposite of what I need: in my case, the target does exist.  This hook is called too late anyway (after the redirect).
-       The hooks SpecialSearchResults and SpecialSearchNoResults do not fire in this situation
-       Maybe use a hook in the Title or Article class, but how to detect only the Go button? I don't want to include articles that have been visited by URL or by clicking a wiki link.

By brute force, I could probably make my extension run on every page load (ugh), tracking if I'm on Special:Search with a query string parameter "Go=go", and then use the SpecialSearchNogomatch hook to exclude searches that fail.  But that feels like an inefficient hack.

Thanks for any ideas....
DanB