Terminal tab titles and git branch in bash prompt

function set_window_and_tab_title
{
    local title="$1"
    if [[ -z "$title" ]]; then
        title="root"
    fi

    local tmpdir=~/Library/Caches/${FUNCNAME}_temp
    local cmdfile="$tmpdir/$title"

    # Set window title
    echo -n -e "\033]0;${title}\a"

    # Set tab title
    if [[ -n ${CURRENT_TAB_TITLE_PID:+1} ]]; then
        kill $CURRENT_TAB_TITLE_PID
    fi
    mkdir -p $tmpdir
    ln /bin/sleep "$cmdfile"
    "$cmdfile" 10 &
    CURRENT_TAB_TITLE_PID=$(jobs -x echo %+)
    disown %+
    kill -STOP $CURRENT_TAB_TITLE_PID
    command rm -f "$cmdfile"
}

PROMPT_COMMAND='set_window_and_tab_title "${PWD##*/}"'

function parse_git_dirty {
  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit (working directory clean)" ]] && echo "*"
}
function parse_git_branch {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/(\1$(parse_git_dirty))/"
}

# set prompt: ``username@hostname:/directory $ ''
PS1="\u@\h \W \$(parse_git_branch) " 
case `id -u` in
      0) PS1="${PS1}# ";;
      *) PS1="${PS1}$ ";;
esac