dotfiles/.local/bin/statusbar/sb-nettraf

#!/bin/sh

big="\033[11m"
reset="\033[0m"

update() {
	sum=0
	for arg; do
		read -r i <"$arg"
		sum=$((sum + i))
	done
	cache=/tmp/${1##*/}
	[ -f "$cache" ] && read -r old <"$cache" || old=0
	printf "%b" "$sum\n" >"$cache"
	printf "%b" "$((sum - old))\n"
}

rx=$(update /sys/class/net/[ew]*/statistics/rx_bytes)
tx=$(update /sys/class/net/[ew]*/statistics/tx_bytes)
printf "%b%5sB %b%5sB%b" "$big$reset" "$(numfmt --to=iec "$rx")" "$big$reset" "$(numfmt --to=iec "$tx")" "\n"