Format ruby code in vim

Question

Just moving over to vim at the moment. In textmate I could format code by hitting cmd-alt-[. How do I achieve the same in vim?

---

See the answer below for the command. I found I also need the following in my vimrc so that vim new how to autoindent ruby.

if has("autocmd")
  filetype indent on
endif

Answer 1

ggVGgq will reformat the entire file according to the current filetype

Answer 2

Try:

gg=G

in normal mode.

Answer 3

Vimcasts has a useful screencast on this subject that you may be interested in

gg=G

gg => go to start of file
=  => apply autoformatting
G  => ... to the end of file