Custom bash prompt with git and syntax coloration

bash_prompt

source /usr/local/etc/bash_completion.d/git-prompt.sh

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

function prompt_cmd() {
    previous_return_value=$?;
    prompt="${RED}\u@\h ❯ ${YELLOW}\w${BLUE}$(__git_ps1)"

    if test $previous_return_value -eq 0
    then
        PS1="${prompt}${LIGHT_GRAY} ❯ "
    else
        PS1="${prompt}${RED} ❯ ${LIGHT_GRAY}"
    fi
}

PROMPT_COMMAND=prompt_cmd