My bash_profile with git branch and status color

.bash_profile

source '/usr/local/share/chruby/chruby.sh'
source '/usr/local/share/chruby/auto.sh'

alias ll='ls -la'

# set the bash prompt
function set_bash_prompt () {
	SEPARATOR=""
	STATUS_COLOR=""

	# colors
	        RED="\[\033[0;91m\]"
	      GREEN="\[\033[0;92m\]"
	     YELLOW="\[\033[0;93m\]"
	       BLUE="\[\033[0;94m\]"
	     PURPLE="\[\033[0;95m\]"
	      WHITE="\[\033[1;37m\]"
	 COLOR_NONE="\[\e[0m\]"

	# parse "git branch"
	BRANCH=`git branch 2> /dev/null | grep -e ^* | sed -E  s/^\\\\\*\ //`

	# if BRANCH isn't empty, use a separator
	if [[ -n $BRANCH ]]; then
		SEPARATOR=":"
	fi

	# capture "git status"
	local git_status="$(git status 2> /dev/null)"

	# parse captured status for color
	if [[ ${git_status} =~ "working directory clean" ]]; then
	  STATUS_COLOR="${GREEN}"
	elif [[ ${git_status} =~ "Changes to be committed" ]]; then
	  STATUS_COLOR="${YELLOW}"
	else
	  STATUS_COLOR="${RED}"
	fi

	# fancy prompt
	PS1="${BLUE}\W${COLOR_NONE}${SEPARATOR}${STATUS_COLOR}${BRANCH}${COLOR_NONE} $ "

	# iterm title bar
	echo -ne "\033]0;${PWD##*/}\007"
}


# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=set_bash_prompt