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 needed the following in my .vimrc
so that Vim knew how to autoindent Ruby.
if has("autocmd")
filetype indent on
endif
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