Is there a hook or preprocess function that I can access to write my own theming function for a drupal menu (in this case, primary links)?
I have a rather complex menu structure that requires a little extra markup than I'm currently getting by just rendering the menu items in a block (involving sub-menus with a little custom markup) and really need to get access to build the menu's content variable myself, ideally from an array that has all the primary links and their children in scope.