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config/bspwm/scripts/low_bat_notifier.sh

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+#!/bin/bash
+
+### VARIABLES
+
+POLL_INTERVAL=120    # seconds at which to check battery level
+LOW_BAT=33           # lesser than this is considered low battery
+
+# If BAT0 doesn't work for you, check available devices with command below
+#
+#   $ ls -1 /sys/class/power_supply/
+#
+BAT_PATH=/sys/class/power_supply/BAT0
+BAT_STAT=$BAT_PATH/status
+
+if [[ -f $BAT_PATH/charge_full ]]
+then
+    BAT_FULL=$BAT_PATH/charge_full
+    BAT_NOW=$BAT_PATH/charge_now
+elif [[ -f $BAT_PATH/energy_full ]]
+then
+    BAT_FULL=$BAT_PATH/energy_full
+    BAT_NOW=$BAT_PATH/energy_now
+else
+    exit
+fi
+
+### END OF VARIABLES
+
+kill_running() {     # stop older instances to not get multiple notifications
+   local mypid=$$
+
+   declare pids=($(pgrep -f ${0##*/}))
+
+   for pid in ${pids[@]/$mypid/}; do
+      kill $pid
+      sleep 1
+   done
+}
+
+launched=0
+
+# Run only if battery is detected
+if ls -1qA /sys/class/power_supply/ | grep -q BAT
+then 
+
+    kill_running
+
+    while true
+    do
+        bf=$(cat $BAT_FULL)
+        bn=$(cat $BAT_NOW)
+        bs=$(cat $BAT_STAT)
+
+        bat_percent=$(( 100 * $bn / $bf ))
+
+        if [[ $bat_percent -lt $LOW_BAT && "$bs" = "Discharging" && $launched -lt 3 ]]
+        then
+            notify-send --urgency=critical "$bat_percent% : Low Battery!"
+            launched=$((launched+1))
+        elif [[ "$bs" = "Charging" ]]
+        then
+            launched=0
+        fi
+        sleep $POLL_INTERVAL
+    done
+fi