Refactoring

battery_status_led.sh

@@ -21,49 +21,48 @@
 LOW=10 # flip LED every 2s
 CRIT=5 # flip led every 0.5s
 
-BAT_FULL=`cat /sys/class/power_supply/BAT0/energy_full_design`
-CAPSLOCK_LED=`cat /sys/class/leds/input4\:\:capslock/brightness`
+BAT_FULL_DEV=/sys/class/power_supply/BAT0/energy_full_design
+BAT_STATUS_DEV=/sys/class/power_supply/BAT0/status
+BAT_NOW_DEV=/sys/class/power_supply/BAT0/energy_now
+CAPSLOCK_LED_DEV=/sys/class/leds/input4\:\:capslock/brightness
 
 # If not set by the systemd service file
-LED_DEV=${BATTERY_STATUS_LED_DEV:-/sys/class/leds/input4\:\:capslock/brightness}
+LED_DEV=${BATTERY_STATUS_LED_DEV:-$CAPSLOCK_LED_DEV}
 
-
-CNT=0
+LED=0
 while :
 do
 	# If charging, sleep 1m, then restart the cycle
-	STATUS=`cat /sys/class/power_supply/BAT0/status`
+	STATUS=cat $BAT_STATUS_DEV
 	if [ $STATUS == "Charging" ] ; then
 		echo 0 > $LED_DEV
 		sleep 1m
 		continue
 	fi
 
-	BAT_NOW=`cat /sys/class/power_supply/BAT0/energy_now`
+	BAT_NOW=cat $BAT_NOW_DEV
 	BAT_PCT=$(($BAT_NOW * 100 / $BAT_FULL))
 
 	# If battery has more than >10% left, sleep 1m then restart the cycle
-	if (($BAT_PCT > $LOW )) ; then
+	if (($BAT_PCT >= $LOW )) ; then
 		sleep 1m
 		continue
 	fi
 
-	sleep 0.5s
-	CNT=$((CNT+1))
-
-	# If battery <5% (crytical) flip capslock LED every 0.5s
-	if (( $BAT_PCT <= $CRIT )) ; then
-		CAPSLOCK_LED=$((1 ^ $CAPSLOCK_LED))
-		echo $CAPSLOCK_LED > $LED_DEV 
-	# If battery is on low, but not crytical, flip LED every 4th 0.5s (2s)
-	elif (( $BAT_PCT <= $LOW )) && (( $CNT % 4 == 1 )) ; then
-		CAPSLOCK_LED=$((1 ^ $CAPSLOCK_LED))
-		echo $CAPSLOCK_LED > $LED_DEV 
+	# If battery is on low, but not crytical, flip LED every 2s
+	if (( $BAT_PCT < $LOW )) && (( $BAT_PCT >= $CRIT)) ; then
+		LED=$((1 ^ $LED))
+		echo $LED > $LED_DEV
+		sleep 2s
+		continue
 	fi
 
-	# not sure if i need this:
-	if (( $CNT > 100000 )) ; then
-		CNT=1
+	# If battery is on crytical flip capslock LED every 0.5s
+	if (( $BAT_PCT < $CRIT )) ; then
+		LED=$((1 ^ $LED))
+		echo $LED > $LED_DEV
+		sleep 0.5s
+		continue
 	fi
 done