My old bash git prompt

bash-git-prompt

__git_branch () {
    local b

    if ! b="$(git symbolic-ref HEAD 2>/dev/null)"; then
	if ! b="$(git describe --exact-match HEAD 2>/dev/null)"; then
            b="$(git rev-parse 2>/dev/null | cut -c1-7)..."
        fi
    fi

    echo "$b"
}

__git_dirty () {
    [[ -n "$(git diff-index --name-only HEAD --)" ]] && return 0
}

__git_cstat () {
    local r="$(git config --get branch.$1.remote)"
    local m="$(git config --get branch.$1.merge)"

    m=${m#refs/heads}

    [[ -z "$r" || -z "$m" ]] && return

    local l="$(git rev-list --left-right "$1...$r$m" | cut -c1 | sort | uniq -c)"

    local n="$(echo "$l" | grep "<" | sed -re 's/[^0-9]*([0-9]+).*/\1/')"
    if [ -n "$n" ]; then
	printf -- "\[\033[01;35m\]+$n"
    fi

    local n="$(echo "$l" | grep ">" | sed -re 's/[^0-9]*([0-9]+).*/\1/')"
    if [ -n "$n" ]; then
        printf -- "\[\033[01;31m\]-$n"
    fi
}

__git_prompt () {
    local g b c n

    g="$(git rev-parse --git-dir 2>/dev/null)"
    if [ -z "$g" ]; then
	printf "\[\033[01;34m\]\W"
	return
    fi

    if [ "$g" = ".git" ]; then
        g="$PWD/$g"
    fi

    b="$(__git_branch)"
    b="${b##refs/heads/}"

    if __git_dirty; then
	c="\[\033[01;31m\]"
    else
	c="\[\033[01;32m\]"
    fi

    n="$(__git_cstat "$b")"

    g="${g%/.git}"
    printf "\[\033[01;34m\]%s $c(%s)%s\[\033[01;34m\] - %s" "${g##*/}" "$b" "$n" "${PWD##$g}/"
}

__git_prompt_command() {
	PS1="$(printf "\[\033[01;0m\][ \[\033[00;32m\]\h\[\033[01;0m\] ] $(__git_prompt) \$\[\033[01;0m\] ")"
}

PS1="\[\033[01;0m\][ \[\033[00;32m\]\h\[\033[01;0m\] ] \[\033[01;34m\]\W \$\[\033[01;0m\] "
PROMPT_COMMAND=__git_prompt_command