M-x all-things-emacs

I use this function almost daily. Why? Well, it’s because too many developers use editors that muck the alignment of the source.

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(defun iwb ()
  "indent whole buffer"
  (interactive)
  (delete-trailing-whitespace)
  (indent-region (point-min) (point-max) nil)
  (untabify (point-min) (point-max)))

Open a file, M-x iwb, save, commit, and edit happily.

I can’t take credit for it, but it seems like it should be passed along. I think I originally copied it from another co-worker’s .emacs file when I started using emacs.