I'm working on a plug-in which will override the search results returned by Wordpress, with results from a custom XML feed. However, I'm not looking to do this on a separate page, but to replace the results Wordpress would normally display on the blogs search page with the results from my XML feed.
I have been unable to find a filter or hook which would allow me to intercept or override the results wordpress returns, nor can I find one which allows me to override what is displayed on the page. My first thought was to look for something similar to the_content, but I'm unable to locate anything similar to that for use in this situation.
The plug-in is going to be used by sales staff, so the plug-in needs to work in such a way that it requires as little work and technical knowledge as possible on the part of installer. My reasoning for wanting to override the results instead of inserting a new widget is that I want the plug-in to use the same search form the theme uses by default.
Is this even possible? If so, how would I go about doing it?