add: battery notify script

system/common/opt/batterynotify.nix

@@ -0,0 +1,51 @@
+{ config, lib, pkgs, ... }:
+
+let
+  conf = config.modules.battery-notify;
+in {
+
+  options.modules.battery-notify = with lib; {
+    enable = mkEnableOption "battery-notify";
+  };
+
+  config = lib.mkIf conf.enable {
+    systemd.user.services.battery-notify = {
+      wantedBy = [ "graphical-session.target" ];
+      script = ''
+
+        batval=$(cat /sys/class/power_supply/BAT0/capacity)
+        tempbatval="/tmp/bat_val_$batval"
+      
+        if [ ! -f "$tempbatval" ]; then
+          case "$batval" in
+            75|50|25|10|5)
+              ${pkgs.libnotify}/bin/notify-send -a bat-notify "battery:" "$batval"
+              touch "tempbatval"
+              ;;
+          esac
+        fi
+          
+        for level in 75 50 25 10 5; do
+          if [ "$batval" -gt "$level" ]; then
+            rm -f "/tmp/bat_val_$level"
+          fi
+        done
+      '';
+          
+
+    };
+    
+
+    systemd.user.timers.battery-notify = {
+      wantedBy = [ "timers.target" ];
+      after = [ "basic.target" ];
+      requires = [ "battery-notify.service" ];
+      partOf = [ "battery-notify.service" ];
+      timerConfig = {
+        OnBootSec = "1m";
+        OnUnitActiveSec = "1m";
+      };
+    };
+  };
+
+}