dotfiles/dotlib/generic-post/calendar.sh

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calendar-determine-holiday() {
local month day
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
}
calendar-determine-holiday