#!/bin/bash

#settings:
netspeed=true
ram=true
cpu=true
#-------------------------------------------------------


#---------------- initialize ---------------------------
rm /tmp/.sysmon > /dev/null 2>&1
dstat --net --mem --cpu --output=/tmp/.sysmon 1 1 > /dev/null 2>&1

#----------- up/down speed -----------------------------
if [ $netspeed = true ]; then

upspeed=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f2)/1024*8 | bc)

upkbmb=$(if [ $upspeed -gt 1024 ]; then 
		up1=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f2)/1024/1024 | bc -l)
		echo $up1 | head -c 4
	else 
		echo $upspeed | head -c 3
	fi)

downspeed=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f1)/1024*8 | bc)

downkbmb=$(if [ $downspeed -gt 1024 ]; then 
		down1=$(echo $(cat /tmp/.sysmon | tail -1 | cut -d ',' -f1)/1024/1024*8 | bc -l)
		echo $down1 | head -c 4
	else 
		echo $downspeed | head -c 3
	fi)
#---------------- up/down speed unit --------------------
upunit=$(if [ $upspeed -gt 1024 ]; then echo "Mb/s"; else echo "Kb/s"; fi)
downunit=$(if [ $downspeed -gt 1024 ]; then echo "Mb/s"; else echo "Kb/s"; fi)

fi



#------------------- CPU % used -------------------------
if [ $cpu = true ]; then

cpufree=$(cat /tmp/.sysmon | tail -1 | cut -d ',' -f9)
cpuused=$(echo 100-$cpufree | bc | sed -e 's/\..*//')

fi



#------------------- RAM % used --------------------------
if [ $ram = true ]; then

memused=$(free -m | grep buffers/cache | tr -s ' ' | cut -d' ' -f 3)
memfree=$(free -m | grep buffers/cache | tr -s ' ' | cut -d' ' -f 4)
memtotal=$(echo $memused+$memfree | bc -l)

memusedpercent=$(echo 100-100*$memfree/$memtotal | bc)

fi


#------------------ The Indicator Sysmonitor actual output -
echo $(if [ $ram = true ]; then echo Mem: $memusedpercent% \|; fi) $(if [ $cpu = true ]; then echo CPU: $cpuused% \|; fi) $(if [ $netspeed = true ]; then echo ↑ $upkbmb $upunit  ↓ $downkbmb $downunit; fi)