# Eryn Wells <eryn@erynwells.me>
# vim: set ft=zsh:

function bool {
    if [[ $1 -eq 0 ]]; then
        echo "no"
        return false
    fi

    local lowercase_value=${(L)1}

    if [[ "$lowercase_value" == "yes" ]]; then
        echo "yes"
        return true
    fi

    if [[ "$lowercase_value" == "no" ]]; then
        echo "no"
        return false
    fi

    if [[ "$lowercase_value" =~ '^[0-9]+$' ]]; then
        echo "yes"
        return true
    fi

    echo "no"
    return false
}

bool "$@"