setup-prompt() {
  local last_res=$? color=$PS1_color_green
  PS1="\w "

  if [[ -d .git ]]; then
    PS1+="$(command git branch --show-current) "
  fi

  if [[ -v SSH_CLIENT ]]; then
    PS1+="$PS1_hostname "
  fi

  if (( last_res )); then
    color=$PS1_color_red
  fi

  PS1+="\[$color\][$last_res]\[$PS1_color_reset\] $PS1_prompt_sym "
}

PS1_prompt_sym=λ
PS1_hostname=${HOSTNAME-"$(hostname)"}
PS1_color_red=$(tput setaf 1)
PS1_color_green=$(tput setaf 2)
PS1_color_reset=$(tput sgr0)
PROMPT_COMMAND+=(setup-prompt)

read -r month day < <(date "+%m %d")

if (( 10#$month == 3 && 10#$day < 18 )); then
  if (( 17 - 10#$day == 0 )); then
    printf "Happy Saint Patrick's day!\n"
  else
    printf "Only %d days left until Saint Patrick's day!\n" "$(( 17 - 10#$day ))"
  fi

  PS1_prompt_sym=🍀
elif (( 10#$month == 10 )); then
  if (( 31 - 10#$day == 0 )); then
    printf 'Have a spooky halloween!\n'
  else
    printf 'Only %d days left until Halloween!\n' "$(( 31 - 10#$day ))"
  fi

  PS1_prompt_sym=🎃
elif (( 10#$month == 12 && 10#$day < 26 )); then
  if (( 25 - 10#$day == 0 )); then
    printf 'Merry Christmas!\n'
  else
    printf 'Only %d days left until Christmas!\n' "$(( 25 - 10#$day ))"
  fi

  PS1_prompt_sym=🌲
fi