[Hyprland,Eww] Refactors configs so that I can share more between Vega and Altair

home-manager/features/eww/default.nix

@@ -1,15 +1,48 @@
-{ pkgs, ... }:
 {
-  home = {
-    packages = with pkgs; [
-      # For Noto Sans NF
-      nerd-fonts.noto
-    ];
-
-    file.".config/eww".source = ./config;
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+{
+  options = {
+    programs.eww.widgets = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+    };
   };
 
-  programs.eww = {
-    enable = true;
+  config = {
+    home = {
+      packages = with pkgs; [
+        # For Noto Sans NF
+        nerd-fonts.noto
+      ];
+
+      file.".config/eww".source = ./config;
+    };
+
+    programs.eww = {
+      enable = true;
+    };
+
+    systemd.user.services.eww = lib.mkIf (config.programs.eww.widgets != [ ]) {
+      Unit = {
+        Description = "Eww widgets";
+        After = [ "hyprland-session.target" ]; # Start only after hyprland
+        PartOf = [ "hyprland-session.target" ]; # Force it to exit if hyprland does
+      };
+
+      Service = {
+        Type = "oneshot";
+        RemainAfterExit = true;
+        ExecStart = "${pkgs.eww}/bin/eww open ${lib.concatStringsSep " " config.programs.eww.widgets}";
+        ExecStop = "${pkgs.eww}/bin/eww kill";
+      };
+
+      Install = {
+        WantedBy = [ "hyprland-session.target" ];
+      };
+    };
   };
 }