Basic wallpaper setting and restoring

Signed-off-by: Magic_RB <magic_rb@redalder.org>

home-manager/modules/profiles/workstation.nix

@@ -38,6 +38,7 @@ in
     ../xmonad
     ../pantalaimon.nix
     ../ssh.nix
+    ../wallpaper
   ];
 
   programs.librewolf = {

home-manager/modules/wallpaper/default.nix

@@ -0,0 +1,29 @@
+{ pkgs, lib, ... }:
+let
+  inherit (lib)
+    singleton
+    getExe;
+in
+{
+  systemd.user.services.wallpaper = {
+    Unit = {
+      Description = "Applies wallpaper";
+      After = singleton "graphical-session-pre.target";
+      PartOf = singleton "graphical-session.target";
+    };
+
+    Service = {
+      Type = "oneshot";
+      ExecStart = pkgs.writeShellScript "apply-wallpaper" ''
+        if [[ -f "$HOME/.config/wallpaper" ]]
+        then
+          ${getExe pkgs.feh} --no-fehbg --bg-fill "$HOME/.config/wallpaper"
+        else
+          ${getExe pkgs.feh} --no-fehbg --bg-fill ${./default.png}
+        fi
+      '';
+    };
+
+    Install.WantedBy = singleton "graphical-session.target";
+  };
+}