A reasonable bash prompt with colorized git status

.bashrc

function _git_prompt() {
    local git_status="`git status -unormal 2>&1`"
    if ! [[ "$git_status" =~ Not\ a\ git\ repo ]]; then
        if [[ "$git_status" =~ nothing\ to\ commit ]]; then
            local ansi=42
        elif [[ "$git_status" =~ nothing\ added\ to\ commit\ but\ untracked\ files\ present ]]; then
            local ansi=43
        else
            local ansi=41
        fi
        if [[ "$git_status" =~ On\ branch\ ([^[:space:]]+) ]]; then
            branch=${BASH_REMATCH[1]}
            test "$branch" != master || branch=' '
        else
            # Detached HEAD.  (branch=HEAD is a faster alternative.)
            branch="(`git describe --all --contains --abbrev=4 HEAD 2> /dev/null ||
                echo HEAD`)"
        fi
        echo -n ' \[\e[1;37;'"$ansi"';1m\]'"$branch"'\[\e[0m\]'
    fi
}

function _prompt_command() {
    PS1='\[\e[1;34m\]\w\[\e[0m\]'"`_git_prompt`"' > '
}

PROMPT_COMMAND=_prompt_command