My New Bash Prompt with Git Status

bash_prompt.sh

green() {
  printf "\e[32m${1}\e[00m"
}

light_red() {
  printf "\e[91m${1}\e[00m"
}

radioactive="\u2622"
check_mark="\u2714"
x_mark="\u2715"

prompt_if_git() {
  git status > /dev/null 2> /dev/null
  if [ $? -ne 0 ]; then
    return
  fi
  printf "$1" 
}

prompt_git_branch() {
  git status > /dev/null 2> /dev/null
  if [ $? -ne 0 ]; then
    return
  fi

  git branch 2> /dev/null | sed -e "/^[^*]/d" -e "s/* \(.*\)/\1/"
}

prompt_git_status() {
  git status > /dev/null 2> /dev/null
  if [ $? -ne 0 ]; then
    return
  fi

  git diff-index --quiet HEAD 2> /dev/null
  case $? in
    0) state_char=`green $radioactive`;;
    *) state_char=`light_red $radioactive` ;;
  esac

  printf "$state_char"
}

did_last_fail () {
  case $? in
    0) printf "$(green $check_mark)" ;;
    *) printf "$(light_red $x_mark)" ;;
  esac
}

export PS1="\$(did_last_fail) \u@\h \w \$(prompt_if_git [)\$(prompt_git_branch)\$(prompt_git_status)\$(prompt_if_git ])\n$ "

export PROMPT_DIRTRIM=4