Well, there IS a slight chance to recover a text file, provided that the universe will cease to exist if the file goes missing tomorrow morning. Otherwise it isn't worth the trouble, resources... If you are dead set on recovering it (or part of it, depending on how much disk activity is occuring - it may already be allocating the space to new files), check here:
http://www.fish.com/tct/help-recovering-file
(I think that's the link. Our web-proxy here at work now classifies fish.com as "entertainment", so it's off-limits, even at 2:15 AM, and I'm not about to push the net-admin by circumventing it...)
Anyways, good luck!