bash rightside gitstatus prompt

prompt.sh

# from http://ezprompt.net/
function nonzero_return() {
        RETVAL=$?
        [ $RETVAL -ne 0 ] && echo "$RETVAL"
}

# from http://ezprompt.net/
# get current branch in git repo
function parse_git_branch() {
        BRANCH=`git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'`
        if [ ! "${BRANCH}" == "" ]
        then
                STAT=`parse_git_dirty`
                echo "[${BRANCH}${STAT}]"
        else
                echo ""
        fi
}

# from http://ezprompt.net/
# get current status of git repo
function parse_git_dirty {
        status=`git status 2>&1 | tee`
        dirty=`echo -n "${status}" 2> /dev/null | grep "modified:" &> /dev/null; echo "$?"`
        untracked=`echo -n "${status}" 2> /dev/null | grep "Untracked files" &> /dev/null; echo "$?"`
        ahead=`echo -n "${status}" 2> /dev/null | grep "Your branch is ahead of" &> /dev/null; echo "$?"`
        newfile=`echo -n "${status}" 2> /dev/null | grep "new file:" &> /dev/null; echo "$?"`
        renamed=`echo -n "${status}" 2> /dev/null | grep "renamed:" &> /dev/null; echo "$?"`
        deleted=`echo -n "${status}" 2> /dev/null | grep "deleted:" &> /dev/null; echo "$?"`
        bits=''
        if [ "${renamed}" == "0" ]; then
                bits=">${bits}"
        fi
        if [ "${ahead}" == "0" ]; then
                bits="*${bits}"
        fi
        if [ "${newfile}" == "0" ]; then
                bits="+${bits}"
        fi
        if [ "${untracked}" == "0" ]; then
                bits="?${bits}"
        fi
        if [ "${deleted}" == "0" ]; then
                bits="x${bits}"
        fi
        if [ "${dirty}" == "0" ]; then
                bits="!${bits}"
        fi
        if [ ! "${bits}" == "" ]; then
                echo " ${bits}"
        else
                echo ""
        fi
}

PS1='$(printf "%*s\r%s" $(( COLUMNS-1 )) "$(nonzero_return) $(parse_git_branch) $(date +%H:%M:%S)" "[$(uname -n)@$(whoami)] $PWD\n$ ")'