Run the following to create `~/.git-completion.bash`:

    curl https://github.com/git/git/raw/master/contrib/completion/git-completion.bash > ~/.git-completion.bash

Then add the following to your `~/.bashrc` or `~/.bash_profile` after `PATH`:

    # Set the base PS1
    export PS1="\t: \W$ "

    # Source the git bash completion file
    if [ -f ~/.git-completion.bash ]; then
        source ~/.git-completion.bash
        GIT_PS1_SHOWDIRTYSTATE=true
        GIT_PS1_SHOWSTASHSTATE=true
        GIT_PS1_SHOWUPSTREAM="auto"
        PS1='\t:\[\033[32m\]$(__git_ps1 " (%s)")\[\033[00m\] \W$ '
    fi

    export PS1

This will display the branch name next to the folder name in the bash prompt.

Symbols after the branch name indicate additional information about the repo state:

* `*`: The branch has modifications
* `$`: There are stashed changes
* `=`: The branch is equal with the remote branch
* `<`: The branch is behind the remote branch (can be fast-forwarded)
* `>`: The branch is ahead of the remote branch (remote branch can be fast-forwarded)
* `<>`: The branch and remote branch have diverged (will need merge)