I want to build a road/cyclocross bike with a Dura Ace 9000 rear derailleur and a matching shifter (Dura Ace 9000), but I really want to have disc brakes as well. My understanding is that a mechanical disc brake will work fine with any shifter, since it uses the same kind of cable as a V-brake, but I haven't been able to find any information about whether I can use whatever shifter I want with hydraulic disc brakes. Do I need a special kind of shifter or lever for a hydraulic disc brake on a road bike?
Update: as the answers pointed out, I do need special brifters (thanks for clarifying the term; it made googling easier and more accurate). The compatible brifters are indeed very rare and so far I've noticed that they only come as part of an entire groupset, i.e. I haven't been able to find standalone hydraulic brifters; I can, however, order a complete Shimano 105 or Ultegra groupset with hydraulic brakes (sans rotor) and brifters from certain online retailers. Secondly, what I suspected turned out to be true - Dura Ace 9000 isn't offered with hydraulic disc brakes out of the box.