Go in Vim
The standard Go distribution includes a Go syntax file for Vim in
~/.vim/syntax/ and put the following in
au BufRead,BufNewFile *.go set filetype=go
Extras and Alternative Files
An alternative indent file for Vim by Alecs King can be found here.
The gocode daemon by nsf includes a vim script to do autocompletion.
See the vim-golang repo in Github for alternative syntax highlight, auto-indentation, gofmt and other useful scripts and plugins.
And this reddit post for various ways to integrate
gofmt with vim.