rvm & git in bash prompt

gistfile1.txt

function rvm_version {
    if [ -x ~/.rvm/bin/rvm-prompt ] ; then
      echo $(~/.rvm/bin/rvm-prompt)
    else
      echo " - no rvm - "
    fi
}

function parse_git_branch {
    ref=$(git symbolic-ref HEAD 2> /dev/null) || return
    local a=""

    lb=${ref#refs/heads/}
        
    local ro=$(git config --get branch.${lb}.remote || echo "origin")
    local rb=$(git config --get branch.${lb}.merge)
    rb=${rb#refs/heads/}
        
    local ab=
    if [ "" != "${rb}" ]; then
        ab="(+$(git log --pretty=format:%H ${ro}/${rb}..${lb} | wc -w | sed s'/ //'g))"
        if [ "(+0)" = "${ab}" ]; then
            ab="(-$(git log --pretty=format:%H ${lb}..${ro}/${rb} | wc -w | sed s'/ //'g))"
        fi
        if [ "(-0)" = "${ab}" ]; then
            ab=""
        fi
    fi

    echo "("${ref#refs/heads/}")${ab}"
}

PS1='++[\u\[\033[01;37m\]$(parse_git_branch),\[\033[01;33m\]$(rvm_version)\[\033[00m\]]'$HOST':\w @ \d \t\n+\!+> '