OpenStack PS1 snippet

I have been studying for my OpenStack certification test (the COA) which is scheduled next week. One thing that was painful to keep track of was the user I was using to interface with OpenStack as the rc file you download from OpenStack does not update your PS1 prompt. I came up with the following solution and placed it in my ~/.bashrc:

function parse_os_user() {
    if [ ! "${OS_USERNAME}" == "" ]
    then
        echo "(${OS_USERNAME})"
    else
        echo ""
    fi
}

PS1='\u@\h \w `parse_os_user` $ '