How to get git diff colorization also within vim when committing?

Question

When I view git diff I see all those nice colors for removed and added lines. Yet when I git commit -av to both read and reject or accept the commit, all I have is ugly one-colored text.

My .gitconfig contains:

[color]
        diff = auto
        status = auto
        branch = auto
        ui = true [core]
        excludesfile = ~/.gitignore
        editor = vim

I know that it works because I used to have it set up on a Ubuntu machine. I am on OSX though having installed git with homebrew.

How do I get those nice colors?

Answer 1

I had to setup ~/.vimrc and add:

syntax on