Add tungsten (#9)

Reviewed-on: https://codeberg.org/leana8959/.files/pulls/9
Co-authored-by: Léana 江 <leana.jiang+git@icloud.com>
Co-committed-by: Léana 江 <leana.jiang+git@icloud.com>

nix/configurations/tungsten/nixos/gui.nix

@@ -0,0 +1,57 @@
+{pkgs, ...}: {
+  services.xserver.windowManager.xmonad = {
+    enable = true;
+    extraPackages = hs: [
+      # https://github.com/ValveSoftware/steam-for-linux/issues/9376
+      # opt into 0.18.1 specifically
+      hs.xmonad-contrib_0_18_1
+    ];
+  };
+
+  services.xserver = {
+    enable = true;
+    autoRepeatDelay = 300;
+    autoRepeatInterval = 40;
+  };
+
+  services.xserver.displayManager.lightdm = {
+    enable = true;
+    background = "#000000";
+    greeters.gtk.cursorTheme = {
+      name = "volantes_cursors";
+      package = pkgs.volantes-cursors;
+      size = 64;
+    };
+  };
+
+  services.xscreensaver.enable = true;
+
+  services.picom = {
+    enable = true;
+    backend = "glx";
+    vSync = true;
+    fade = true;
+    fadeDelta = 3;
+    settings = {
+      fade-exclude = [
+        "name = 'Fcitx5 Input Window'"
+        "class_g = 'fcitx'"
+        "class_i = 'fcitx'"
+      ];
+      blur = {
+        method = "dual_kawase";
+        strength = 5;
+      };
+      wintypes = {
+        dropdown_menu = {
+          opacity = 1;
+          blur-background = false;
+        };
+        popup_menu = {
+          opacity = 1;
+          blur-background = false;
+        };
+      };
+    };
+  };
+}