#!/usr/bin/env sh

# Module showing CPU load as a changing bars.
# Just like in polybar.
# Each bar represents amount of load on one core since
# last run.

# Cache in tmpfs to improve speed and reduce SSD load
cache=/tmp/cpubarscache

# id total idle
stats=$(awk '/cpu[0-9]+/ {printf "%d %d %d\n", substr($1,4), ($2 + $3 + $4 + $5), $5 }' /proc/stat)
[ ! -f $cache ] && echo "$stats" > "$cache"
old=$(cat "$cache")
printf " %s " ""
echo "$stats" | while read -r row; do
	id=${row%% *}
	rest=${row#* }
	total=${rest%% *}
	idle=${rest##* }

	case "$(echo "$old" | awk '{if ($1 == id)
		printf "%d\n", (1 - (idle - $3)  / (total - $2))*100 /12.5}' \
		id="$id" total="$total" idle="$idle")" in

		"0") printf "▁";;
		"1") printf "▂";;
		"2") printf "▃";;
		"3") printf "▄";;
		"4") printf "▅";;
		"5") printf "▆";;
		"6") printf "▇";;
		"7") printf "█";;
		"8") printf "█";;
	esac
done; printf " \\n"
echo "$stats" > "$cache"