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@@ -0,0 +1,73 @@
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+#!/bin/bash
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+
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+RED="\033[41m \033[0m"
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+GREEN="\033[42m \033[0m"
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+GAP=" "
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+
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+if [ $# -lt 1 ]; then
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+ echo "Usage: $0 birthdate [username]"
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+ echo "Example: $0 1985-06-08 Joe"
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+ exit 1
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+fi
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+
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+birthdate=$1
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+name=${2:-$USER}
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+columns=${3:-20}
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+
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+life_expectancy=80
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+last_year_index=$((life_expectancy - 1))
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+
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+case "$(uname)" in
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+ "Linux")
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+ birth_year=$(date -d "$birthdate" +"%Y")
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+ birth_timestamp=$(date -d "$birthdate" +%s)
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+ ;;
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+ "Darwin")
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+ birth_year=$(date -j -f "%Y-%m-%d" "$birthdate" +"%Y")
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+ birth_timestamp=$(date -j -f "%Y-%m-%d" "$birthdate" +%s)
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+ ;;
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+ *) echo "Unsupported OS"; exit 1 ;;
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+esac
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+
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+current_year=$(date +"%Y")
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+current_timestamp=$(date +%s)
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+years_passed=$((current_year - birth_year))
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+weeks_passed=$(( (current_timestamp - birth_timestamp) / 604800 ))
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+total_weeks=$((life_expectancy * 52))
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+weeks_remaining=$((total_weeks - weeks_passed))
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+
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+echo -e "$name, only $weeks_remaining Sundays remain\n"
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+
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+rows=$((life_expectancy / columns))
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+
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+for (( row=0; row<rows; row++ )); do
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+ for (( col=0; col<columns; col++ )); do
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+ year_index=$((row * columns + col))
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+ if (( year_index == 0 )); then
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+ echo $birth_year
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+ fi
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+ if (( year_index < years_passed )); then
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+ echo -ne "${RED}${GAP}"
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+ else
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+ echo -ne "${GREEN}${GAP}"
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+ fi
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+ done
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+ echo
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+ if (( year_index != $last_year_index )); then
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+ echo
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+ fi
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+done
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+
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+# print spaces before last year
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+gaps=$((columns - 1))
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+squares=$((columns * 2))
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+indent=$((gaps + squares - 4))
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+for ((i=0; i<indent; i++)); do
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+ echo -n ' '
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+done
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+
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+last_year=$((birth_year + last_year_index))
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+echo $last_year
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+
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+echo -e "\nHow are you going to spend these Sundays, $name?"
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+
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control