dotfiles/.local/bin/statusbar/nettraf

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#!/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.
lasttime=${XDG_CACHE_HOME:-$HOME/.cache}/nettraf_time
update() {
sum=0
for arg; do
read -r i < "$arg"
sum=$(( sum + i ))
done
cache=${XDG_CACHE_HOME:-$HOME/.cache}/${1##*/}
[ -f "$cache" ] && read -r old < "$cache" || old=0
printf %d\\n "$sum" > "$cache"
printf %d\\n $(( sum - old ))
}
[ -f "$lasttime" ] && read -r previoustime < "$lasttime" || previoustime=0
rx=$(update /sys/class/net/[ew]*/statistics/rx_bytes)
tx=$(update /sys/class/net/[ew]*/statistics/tx_bytes)
timedifference=$(( $(date +'%s') - previoustime ))
if [ "$timedifference" -gt 0 ]; then
rx_avg=$(( rx / timedifference ))
tx_avg=$(( tx / timedifference ))
else
rx_avg=$rx
tx_avg=$tx
fi
printf '⬇%s ⬆%s\n' "$(numfmt --to=iec "$rx_avg")" "$(numfmt --to=iec "$tx_avg")"
date +'%s' > "$lasttime"