segments/ifstat_sys.sh


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# Show if stats by sampling /sys/.
# Originally stolen from http://unix.stackexchange.com/questions/41346/upload-download-speed-in-tmux-status-line

run_segment() {
	sleeptime="0.5"
    iface="eth0"
	RXB=$(</sys/class/net/"$iface"/statistics/rx_bytes)
	TXB=$(</sys/class/net/"$iface"/statistics/tx_bytes)
	sleep "$sleeptime"
	RXBN=$(</sys/class/net/"$iface"/statistics/rx_bytes)
	TXBN=$(</sys/class/net/"$iface"/statistics/tx_bytes)
	RXDIF=$(echo "$((RXBN - RXB)) / 1024 / ${sleeptime}" | bc )
	TXDIF=$(echo "$((TXBN - TXB)) / 1024 / ${sleeptime}" | bc )

    if [ $RXDIF -gt 1024 ]; then
        RXDIF_ECHO="↓ $(echo "scale=1;${RXDIF} / 1024" | bc)M/s"
    else
        RXDIF_ECHO="↓ ${RXDIF}K/s"
    fi
    if [ $TXDIF -gt 1024 ]; then
        TXDIF_ECHO="↑ $(echo "scale=1;${TXDIF} / 1024" | bc)M/s"
    else
        TXDIF_ECHO="↑ ${TXDIF}K/s"
    fi

	echo -e "${RXDIF_ECHO} ${TXDIF_ECHO}"
	return 0
}