Add battery watch

.xsessionrc

@@ -13,6 +13,7 @@ if [[ "$DESKTOP_SESSION" = "dwm"  || "$DESKTOP_SESSION" == "dwm-gnome" ]]; then
     dunst &
     numlockx on &
     nm-applet &
+    battery-watch &
 
     if command -v barrier &> /dev/null ; then
        barrier &

bin/battery-watch

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+# https://www.reddit.com/r/suckless/comments/m6r71v/comment/gr7t2z1/?utm_source=reddit&utm_medium=web2x&context=3
+
+# Control variable
+# Possible values: NONE, FULL, LOW, CRITICAL
+last="NONE"
+
+# Default values for LOW/CRITICAL status
+low=15
+critical=10
+
+while true; do
+
+  # If battery is plugged, do stuff
+  battery="/sys/class/power_supply/BAT0"
+  if [ -d $battery ]; then
+
+    capacity=$(cat $battery/capacity)
+    status=$(cat $battery/status)
+
+    # If battery full and not already warned about that
+    if [ "$last" != "FULL" ] && [ "$status" = "Full" ]; then
+      notify-send "Battery full"
+      last="FULL"
+    fi
+
+    # If low and discharging
+    if [ "$last" != "LOW" ] && [ "$status" = "Discharging" ] && \
+       [ $capacity -le $low ]; then
+      notify-send "Battery low: $capacity%"
+      last=LOW
+    fi
+
+    # If critical and discharging
+    if [ "$status" = "Discharging" ] && [ $capacity -le $critical ]; then
+      notify-send -u critical "Battery very low: $capacity%"
+      last=CRITICAL
+    fi
+  fi
+  sleep 60
+done
+