Roderik, I think that the configuration of git has nothing to do with homebrew installation and configuration. It will be cleaner to seperate this in another role.

If you agree, I'll create the necessary pull requests.

For example, I want to install MacVim with the --with-override-system-vim flag. Currently I have something like this:

- name: install developer brew applications
  homebrew: name={{item}} state=latest
  with_items:
    - macvim
    - tmux

Thanks @roderik!

On a fresh install, superlumic fails after ansible-role-homebrew. I'm getting this error:
Error: A newer Command Line Tools release is available.\nUpdate them from Software Update in the App Store.

In diagnosing, when I run $ brew doctor I see:
Error: You have not agreed to the Xcode license. Please resolve this by running:
sudo xcodebuild -license accept

That might be something to add to the script.

The way you enable casks these days is just by tapping, according to the official page http://caskroom.io/:

$ brew tap caskroom/cask

No need to do this: