#!/bin/bash

function helpexit() {
    echo "Display file/folder sizes like 'du', but faster and actual byte sizes"
    echo "Returns only the size as number"
    echo "  -h       Human readable units"
    echo "  --help   This help"
    exit
}
function filesize {
# Return a human readable size from integer of bytes
# Usage:  filesize 10000

    [ "$1"  = "0" ] && {
        echo "0 B"
        return 0
    }

    awk 'BEGIN{ x = '$1'
        split("B KB MB GB TB PB EB ZB",type)
        for(i=7;y < 1;i--)
            y = x / (2^(10*i))
        str=int(y*10)/10 " " type[i+2] 
        if (x==0) { str = "0 B" }
        print str
    }' || return $?
}

[[ -z "$1" ]] && what="."
[[ "$1" = "-h" ]] && { HUMAN=1; shift 1; }
[[ "$1" = "--help" ]] && helpexit

SIZE=$( find $what "$@" -type f -printf %s"\n" | awk '{  sum += $1 } END { print int(sum)+0 }' )

[[ "$HUMAN" -eq 1 ]] && {
    filesize "$SIZE"
    exit
}
echo $SIZE