#!/bin/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

case $BLOCK_BUTTON in
	2) setsid -f "$TERMINAL" -e htop ;;
	3) notify-send "🪨 CPU load module" "Each bar represents 
one CPU core";;
	6) "$TERMINAL" -e "$EDITOR" "$0" ;;
esac

# 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 "$cache")
echo -n "🪨"
echo "$stats" | while read 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") echo -n "▁";;
		"1") echo -n "▂";;
		"2") echo -n "▃";;
		"3") echo -n "▄";;
		"4") echo -n "▅";;
		"5") echo -n "▆";;
		"6") echo -n "▇";;
		"7") echo -n "█";;
		"8") echo -n "█";;
	esac
done
echo ""
echo "$stats" > "$cache"