feat: added i3 systemdTarget

feat: added xorg wallpaper module

hm-modules/wallpapers.nix

@@ -0,0 +1,60 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}: {
+  options.xsession.wallpapers = {
+    enable = lib.mkEnableOption "automatically refreshing randomly selected wallpapers";
+    folder = lib.mkOption {
+      description = "The folder from which the wallpapers are selected. Relative to home directory";
+      type = lib.types.str;
+      default = ".local/share/wallpapers";
+    };
+    refreshInterval = lib.mkOption {
+      description = "How often new wallpapers are drawn. Used as a Systemd timer interval.";
+      type = lib.types.str;
+      default = "3 min";
+    };
+  };
+  config = let
+    cfg = config.xsession.wallpapers;
+    exe =
+      pkgs.writeShellScript "set-wallpaper"
+      ''
+           ${pkgs.feh}/bin/feh --no-fehbg --bg-fill --randomize \
+        $( ${pkgs.findutils}/bin/find ${config.home.homeDirectory}/${cfg.folder} \( -iname "*.png" -or -iname "*.jpg" \) )
+      '';
+  in
+    lib.mkIf cfg.enable {
+      systemd.user = {
+        timers = {
+          set-wallpaper = {
+            Unit = {
+              Description = "Set a random wallpaper every 3 minutes";
+            };
+            Timer = {
+              OnUnitActiveSec = cfg.refreshInterval;
+            };
+            Install.WantedBy = [
+              "timers.target"
+            ];
+          };
+        };
+        services = {
+          set-wallpaper = {
+            Unit = {
+              Description = "Set a random wallpaper on all X displays";
+            };
+            Service = {
+              Type = "oneshot";
+              ExecStart =
+                exe;
+            };
+            Install.WantedBy = ["graphical-session.target"];
+          };
+        };
+      };
+      home.persistence."/state".directories = [cfg.folder];
+    };
+}