I think the parent is meaning something like the git-status integration of e.g. oh-my-zsh [0], or something like the 'official' git-status integration script for bash [1]

(I've used the former, but not the latter.)

[0] https://github.com/robbyrussell/oh-my-zsh [1] https://raw.github.com/git/git/master/contrib/completion/git...