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

  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

  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

  prompt_sym=🌲
fi

setup-prompt() {
  if [[ -d .git ]]; then
    git_branch="$(command git branch --show-current) "
  else
    git_branch=""
  fi
}

PROMPT_COMMAND+=(setup-prompt)
PS1='\w $git_branch'

if [[ -v SSH_CLIENT ]]; then
  PS1+='${HOSTNAME-"$(hostname)"} '
fi

PS1+='${prompt_sym-λ} '