gistfile1.txt

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}"
}