feat: added i3 systemdTarget

feat: added xorg wallpaper module

flake.nix

@@ -27,6 +27,8 @@
     {
       nixosModules.extra-modules = import ./modules;
       nixosModules.default = self.nixosModules.extra-modules;
+      homeManagerModules.extra-modules = import ./hm-modules;
+      homeManagerModules.default = self.homeManagerModules.extra-modules;
     }
     // flake-utils.lib.eachDefaultSystem (system: rec {
       pkgs = import nixpkgs {

hm-modules/default.nix

@@ -0,0 +1,6 @@
+{
+  imports = [
+    ./i3.nix
+    ./wallpapers.nix
+  ];
+}

hm-modules/i3.nix

@@ -0,0 +1,31 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}: {
+  options.xsession.windowManager.i3.enableSystemdTarget = lib.mkEnableOption "i3 autostarting the systemd graphical user targets";
+  config = let
+    cfg = config.xsession.windowManager.i3.enableSystemdTarget;
+  in
+    lib.mkIf cfg {
+      systemd.user = {
+        targets.i3-session = {
+          Unit = {
+            Description = "i3 session";
+            Documentation = ["man:systemd.special(7)"];
+            BindsTo = ["graphical-session.target"];
+            Wants = ["graphical-session-pre.target"];
+            After = ["graphical-session-pre.target"];
+          };
+        };
+      };
+      xsession.windowManager.i3.config.startup = lib.mkAfter [
+        {
+          command = "${pkgs.systemd}/bin/systemctl --user start i3-session.target";
+          always = false;
+          notification = false;
+        }
+      ];
+    };
+}

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];
+    };
+}