#!/bin/bash
YEAR=1978
MONTH=6
DAY=19
REALYEAR=78
REALMONTH=06
REALDAY=19

function getit {
 wget http://images.ucomics.com/comics/ga/$YEAR/ga$REALYEAR$REALMONTH$REALDAY.gif -O $YEAR-$REALMONTH-$REALDAY.gif
 }
 
function isleapday {
 if [ "$(($YEAR %4))" = "0" ]; then
 echo $REALYEAR-$REALMONTH-$REALDAY
 getit
 fi
 } 
 
function fixmonth {
 if [ "$MONTH" = "13" ]; then
 let MONTH=1
 REALMONTH=0$MONTH
 fi
 }
 
function addmonth {
 let MONTH=MONTH+1
 if [ $MONTH -lt 10 ]; then
  REALMONTH=0$MONTH
 else
  REALMONTH=$MONTH
 fi
 } 
 
function fixday {
 if [ "$DAY" = "$1" ]; then
 let DAY=1
 REALDAY=0$DAY
 fi
 }
 
function addday {
 let DAY=DAY+1
 if [ $DAY -lt 10 ]; then
  REALDAY=0$DAY
 else
  REALDAY=$DAY
 fi
 }
 
function daycycle {
while [ $DAY -le $1 ]; do
    getit
    echo $REALYEAR-$REALMONTH-$REALDAY
    addday
done
fixday $(($1+1))
} 
 
while [ $YEAR -le 2006 ]; do
    REALYEAR=${YEAR:2}
    mkdir $YEAR
    cd $YEAR
    while [ $MONTH -le 12 ]; do
	if [ "$MONTH" = "4" ]; then
	    while [ $DAY -le 28 ]; do
		getit
		echo $REALYEAR-$REALMONTH-$REALDAY
		addday
	    done
	    isleapday
	    fixday 29
	elif [ "$MONTH" = "1" ] || [ "$MONTH" = "3" ] || [ "$MONTH" = "5" ] || [ "$MONTH" = "7" ] || [ "$MONTH" = "8" ] || [ "$MONTH" = "10" ] || [ "$MONTH" = "12" ]; then
	    daycycle 31
	else
	    daycycle 30
	fi
	addmonth
    done
    fixmonth
    cd ..
    let YEAR=YEAR+1
done