Way to get colored bash prompt based on git status

gistfile1.sh

#configuration for my bash prompt
prompt_function() {
  local        BLACK='\[\033[0;30m\]'
  local  LIGHT_BLACK='\[\033[1;30m\]'
  local          RED='\[\033[0;31m\]'
  local    LIGHT_RED='\[\033[1;31m\]'
  local        GREEN='\[\033[0;32m\]'
  local  LIGHT_GREEN='\[\033[1;32m\]'
  local       YELLOW='\[\033[0;33m\]'
  local LIGHT_YELLOW='\[\033[1;33m\]'
  local         BLUE='\[\033[0;34m\]'
  local   LIGHT_BLUE='\[\033[1;34m\]'
  local       PURPLE='\[\033[0;35m\]'
  local LIGHT_PURPLE='\[\033[1;35m\]'
  local         CYAN='\[\033[0;36m\]'
  local   LIGHT_CYAN='\[\033[1;36m\]'
  local   DARK_WHITE='\[\033[0;37m\]'
  local        WHITE='\[\033[1;37m\]'
  local        RESET='\[\033[0m\]'

  # previous_return_value=$?;
  # case $previous_return_value in
  #   0)
  #     prompt_color="${RESET}"
  #   ;;
  #   1)
  #     prompt_color="${LIGHT_RED}"
  #   ;;
  #   *)
  #     prompt_color="${LIGHT_YELLOW}"
  #   ;;
  # esac
  # use "${prompt_color}\$${RESET}" instead of "\$" below

  if test $(git status 2> /dev/null | grep -c :) -eq 0; then
    git_color="${GREEN}"
  else
    git_color="${RED}"
  fi
  PS1="${RESET}${CYAN}\u${RESET}: \w${git_color}$(__git_ps1)${RESET}\$ "
}
PROMPT_COMMAND=prompt_function


#configuration for autojump
if [ -f `brew --prefix`/etc/autojump ]; then
  . `brew --prefix`/etc/autojump
fi