Update

home/scripts/system/default.nix

@@ -0,0 +1,42 @@
+{ pkgs, ... }:
+
+let
+  notify-system = pkgs.writeShellScriptBin "notify-system" ''
+    function minute() {
+      while true;do
+        battery-plugged &
+        battery-level &
+        sleep 60
+      done
+    }
+
+
+    minute &
+  '';
+
+  battery-plugged = pkgs.writeShellScriptBin "battery-plugged" ''
+    BATTERY_STATUS=$(cat /sys/class/power_supply/BAT*/status | head -n1)
+    OLD_BATTERY_STATUS=$(cat /tmp/old_battery_status 2>/dev/null || echo "Unknown")
+    if [[ $BATTERY_STATUS != $OLD_BATTERY_STATUS ]]; then
+      if [[ $BATTERY_STATUS == "Discharging" ]]; then
+        ${pkgs.libnotify}/bin/notify-send "󰁻  " "Battery is unplugged"
+      else
+        ${pkgs.libnotify}/bin/notify-send "󰁻  " "Battery is plugged in"
+      fi
+    fi
+    echo $BATTERY_STATUS > /tmp/old_battery_status
+  '';
+
+  battery-level = pkgs.writeShellScriptBin "battery-level" ''
+    BATTERY_LEVEL=$(cat /sys/class/power_supply/BAT*/capacity | head -n1)
+    BATTERY_STATUS=$(cat /sys/class/power_supply/BAT*/status | head -n1)
+    if [[ $BATTERY_LEVEL -le 20 ]] && [[ $BATTERY_STATUS == "Discharging" ]]; then
+      ${pkgs.libnotify}/bin/notify-send "󰁻  Low battery" "Battery level is $BATTERY_LEVEL%"
+    elif [[ $BATTERY_LEVEL -le 10 ]] && [[ $BATTERY_STATUS == "Discharging" ]]; then
+      ${pkgs.libnotify}/bin/notify-send --urgency=critical "󰁺  Very low battery" "Battery level is $BATTERY_LEVEL%"
+    fi
+  '';
+
+in {
+  home.packages = with pkgs; [ notify-system battery-plugged battery-level ];
+}