My .bash_profile setup on OS X. Modified from Mark Otto's bash style (http://markdotto.com/2013/01/13/improved-terminal-hotness/) by adding git color for status.

gistfile1.sh

alias ls='ls -Glah'
alias web='open -a Safari.app'
alias mail='open -a Mail.app'
alias todo='open -a Reminders.app'
git_branch () {
    if git rev-parse --git-dir >/dev/null 2>&1
        then echo -e "" [$(git branch 2>/dev/null| sed -n '/^\*/s/^\* //p')]
    else
        echo ""
    fi
}
function git_color {
    local STATUS=`git status 2>&1`
    if [[ "$STATUS" == *'Not a git repository'* ]]
        then echo ""
    else
    if [[ "$STATUS" != *'working directory clean'* ]]
        then
        # red if need to commit
        echo -e '\033[0;31m'
    else
    if [[ "$STATUS" == *'Your branch is ahead'* ]]
        then
        # yellow if need to push
        echo -e '\033[0;33m'
    else
        # else cyan
        echo -e '\033[0;32m'
    fi
    fi
    fi
}
export PS1='\[\033[0;35m\]⌘ \[\033[0;34m\]\w/\[$(git_color)\]$(git_branch)\[\033[m\] '

According to one of the git release notes:

"git status" used to say "working directory" when it meant "working tree".

So pretty much git status will now say working tree instead of working directory. Line 17 should be updated to reflect that, or else it will always be false.