leapyear.sh

leapyear.sh

#!/bin/bash

function_testleap () {

    local WORK_YEAR=$1

    local IS_LEAP="false"
    local IS_100="false"
    local IS_400="false"

    if [[ $((WORK_YEAR % 4)) -ne 0 ]]; then
        : #not a yeap lear
    elif [[ $((WORK_YEAR % 400)) -eq 0 ]]; then
        local IS_400="true"
    elif [[ $((WORK_YEAR % 100)) -eq 0 ]]; then
        local IS_100="true"
    else
        local IS_LEAP="true"
    fi

    if  [[ $IS_LEAP == "true" ]]; then
        echo -n 10
    elif [[ $IS_400 == "true" ]]; then
        echo -n 11
    elif [[ $IS_100 == "true" ]]; then
        echo -n 1
    else
        echo -n 0
    fi


}

showhelp() {
    echo "leapyear.sh v1.0 02/27/2016"
    echo "written by @acetwenty8"
    echo "   -h                  print this help screen"
    echo "   -y [start_year]     year to start with (default 1752)"
    echo "   -c [count]          number of years to count forward (default 0)"
    echo "   -100                print non-leap years due to being divisable by 100"
    echo "   -400                print leap years due to being divisible by 400"
    echo ""
    exit
}

COUNT=1
START_YEAR=1752

ARGS=$@
while [[ $# > 0 ]]
do
key="$1"

case $key in
    -y|--year)
    START_YEAR="$2"
    shift
    ;;
    -c|--count)
    COUNT="$2"
    shift
    ;;
    -100)
    PRINT_100="1"
    ;;
    -400)
    PRINT_400="1"
    ;;
    -h|--help)
    SHOW_HELP="1"
    ;;
    *)
    ;;
esac
shift
done

if [[ $SHOW_HELP -eq 1 ]]; then
    showhelp
    exit
fi

YEAR=$START_YEAR

if  [[ $PRINT_100 -eq 1 ]]; then
    RUN=1
    VAR=1
elif [[ $PRINT_400 -eq 1 ]]; then
    RUN=1
    VAR=11
fi

i=0
while [[ $i -le $COUNT ]]; do
    result=$(function_testleap $YEAR)
    if [[ $RUN -eq 1  ]]; then
        if [[ $result -eq $VAR ]]; then
            echo $YEAR
        fi
    else
        if [[ $result -ge 10 ]]; then
            echo $YEAR
        fi
    fi
    let "i++"
    let "YEAR++"
done