Update flake, theme gtk, add vscode cache

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

users/configs/gtk/default.nix

@@ -1,10 +1,50 @@
-{ user ? throw "user argument is required" }: { config, ... }:
+{ user ? throw "user argument is required" }: { config, pkgs, ... }:
 
 let
   hmConfig = config.home-manager.users."${user.name}";
 in
 {
   home-manager.users."${user.name}" = {
-    gtk.gtk2.configLocation = "${hmConfig.xdg.configHome}/gtk-2.0/gtkrc";
+    gtk = {
+      enable = true;
+
+      theme = {
+        package = pkgs.adw-gtk3;
+        name = "adw-gtk3-dark";
+      };
+
+      gtk2.configLocation = "${hmConfig.xdg.configHome}/gtk-2.0/gtkrc";
+      gtk3.extraCss = "@import './theme.css';";
+      gtk4.extraCss = "@import './theme.css';";
+    };
+
+    programs.matugen.settings.templates = {
+      gtk3 = {
+        input_path = ./theme.css;
+        output_path = "${hmConfig.xdg.configHome}/gtk-3.0/theme.css";
+      };
+      gtk4 = {
+        input_path = ./theme.css;
+        output_path = "${hmConfig.xdg.configHome}/gtk-4.0/theme.css";
+      };
+    };
+
+    theme.extraConfig = let name = "theme-gtk"; in
+      "${pkgs.writeShellApplication {
+        inherit name;
+        runtimeInputs = with pkgs; [ glib ];
+        text = ''
+          MODE=$(cat "${hmConfig.theme.configDir}/mode")
+
+          if [ "$MODE" = "light" ]; then
+            GTK_THEME="adw-gtk3"
+          else
+            GTK_THEME="adw-gtk3-dark"
+          fi
+
+          gsettings set org.gnome.desktop.interface gtk-theme "$GTK_THEME"
+          gsettings set org.gnome.desktop.interface color-scheme "prefer-$MODE"
+        '';
+      }}/bin/${name} &";
   };
 }