Git PS1 update.sh

#!/bin/bash

__git_ps1() {
	if [ "$(git status -s 2>&1 1>/dev/null)" ]; then
		return
	fi

	if [ -z "$(ps | grep fetch | grep -v grep)" ]; then
		(git fetch 2>/dev/null 1>/dev/null &) > /dev/null
	fi

	local nn=$(git status -s 2>/dev/null | grep "??" | sed -n '$=')
	local nc=$(git status -s 2>/dev/null | grep M | sed -n '$=')
	local branch=$(git branch 2>/dev/null | grep "*" | sed 's/^* //')
	nn=$nn
	nc=$nc

	local msg=""
	local color=""
	local uncolor=`echo -e "\001\033[0m\002"`

	if [ "$(git status 2>/dev/null | grep "our branch is behind 'origin/")" ]; then
		color=`echo -e "\001\033[0;31m\002<<"`
	elif [ "$(git status 2>/dev/null | grep "our branch and" | grep "have diverged")" ]; then
		color=`echo -e "\001\033[1;34m\002<>"`
	elif [ "$(git diff --name-only HEAD origin/$branch 2>/dev/null)" ]; then
		color=`echo -e "\001\033[1;31m\002>>"`
	else
		color=`echo -e "\001\033[1;32m\002"`
	fi

	if [ $nc ]; then
		msg=$msg"-"$nc"c"
	fi
	if [ $nn ]; then
		if [ $msg ]; then
			msg=$msg","$nn"n"
		else
			msg=$msg"-"$nn"n"
		fi
	fi

	echo -e "($color$branch$uncolor$msg)"
}

export PS1='\w$(__git_ps1) \u\$ '