Time Travel

Who says OS X has a monopoly on time machines? Vim can time-travel as well. Ever since the 7.x branch, you can type :earlier 4h to go back in time four hours on the file you're editing then :later 4h to go four hours forward again. See :help earlier for all the options. Note, how far back you can go is limited by the size of you `undolevels' setting.