Even more interesting is the proposal I've seen where you submit the intro, theory and methods section for review at a journal before you do the expeiments. Once what you're planning to do is deemed good and interesting by the reviewers, you get the go-ahead, and the journal will publish your results no matter what they are. Not only does it prevent p-hacking, it also removes bias against negative results.

FWIW, anti-p-hacking measures are already implemented for clinical trials; they have to register expected outcomes at the beginning.