Git info in bash prompt

I modified an existing script to have coloured git info on bash prompt. The original version:

https://gist.github.com/738048

The result (I use black background in gnome-terminal):

kecsap@sakura:~/something/something[master ⚡]$

My script:

RED="\[\033[0;31m\]"
YELLOW="\[\033[0;33m\]"
GREEN="\[\033[0;32m\]"
BLUE="\[\033[0;34m\]"
LIGHT_BLUE="\[\033[1;34m\]"
LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
WHITE="\[\033[1;37m\]"
LIGHT_WHITE="\[\033[1;37m\]"
LIGHT_GRAY="\[\033[0;37m\]"
COLOR_NONE="\[\e[0m\]"

function parse_git_branch {

git rev-parse --git-dir &> /dev/null
git_status="$(git status 2> /dev/null)"
branch_pattern="^# On branch ([^${IFS}]*)"
remote_pattern="# Your branch is (.*) of"
diverge_pattern="# Your branch and (.*) have diverged"
if [[ ! ${git_status}} =~ "working directory clean" ]]; then
state="${LIGHT_RED}⚡"
fi
# add an else if or two here if you want to get more specific
if [[ ${git_status} =~ ${remote_pattern} ]]; then
if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
remote="${YELLOW}↑"
else
remote="${YELLOW}↓"
fi
fi
if [[ ${git_status} =~ ${diverge_pattern} ]]; then
remote="${YELLOW}↕"
fi
if [[ ${git_status} =~ ${branch_pattern} ]]; then
branch=${BASH_REMATCH[1]}
echo "${LIGHT_WHITE}[${COLOR_NONE}${branch} ${remote}${state}${LIGHT_WHITE}]${COLOR_NONE}"
fi
}

function prompt_func() {
previous_return_value=$?;
prompt="${USER}@${HOSTNAME}:${TITLEBAR}${LIGHT_GRAY}\w${GREEN}$(parse_git_branch)${COLOR_NONE}"
if test $previous_return_value -eq 0
then
PS1="${prompt}\$ "
else
PS1="${prompt}${LIGHT_RED}\$${COLOR_NONE} "
fi
}

PROMPT_COMMAND=prompt_func