#!/bin/sh

# Module showing network traffic. Shows how much data has been received (RX) or
# transmitted (TX) since the previous time this script ran. So if run every
# second, gives network traffic per second.

case $BLOCK_BUTTON in
	1) setsid -f "$TERMINAL" -e bmon ;;
	3) notify-send "  Network traffic module" "  : Traffic received
  : Traffic transmitted" ;;
	8) setsid -f "$TERMINAL" -e "$EDITOR" "$0" ;;
esac

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

rx=$(update /sys/class/net/[ew]*/statistics/rx_bytes)
tx=$(update /sys/class/net/[ew]*/statistics/tx_bytes)

printf " %4sB  %4sB\\n" $(numfmt --to=iec $rx $tx)