fixes to build on darwin

modules/nixos/applications/default.nix

@@ -1,5 +1,5 @@
 { ... }: {
 
-  imports = [ ./calibre.nix ];
+  imports = [ ./calibre.nix ./nautilus.nix ];
 
 }

modules/nixos/applications/nautilus.nix

@@ -0,0 +1,55 @@
+{ config, pkgs, lib, ... }: {
+
+  options = {
+    nautilus = {
+      enable = lib.mkEnableOption {
+        description = "Enable Nautilus file manager.";
+        default = false;
+      };
+    };
+  };
+
+  # Install Nautilus file manager
+  config = lib.mkIf (config.gui.enable && config.nautilus.enable) {
+
+    # Quick preview with spacebar
+    services.gnome.sushi.enable = true;
+    environment.systemPackages = [ pkgs.gnome.nautilus ];
+
+    home-manager.users.${config.user} = {
+
+      xsession.windowManager.i3.config.keybindings = {
+        "${
+          config.home-manager.users.${config.user}.xsession.windowManager.i3.config.modifier
+        }+n" = "exec --no-startup-id ${pkgs.gnome.nautilus}/bin/nautilus";
+      };
+
+      programs.fish.functions = {
+        qr = {
+          body =
+            "${pkgs.qrencode}/bin/qrencode $argv[1] -o /tmp/qr.png | ${pkgs.gnome.sushi}/bin/sushi /tmp/qr.png";
+        };
+      };
+
+      # Set default for opening directories
+      xdg.mimeApps = {
+        associations.added."inode/directory" = [ "org.gnome.Nautilus.desktop" ];
+        # associations.removed = {
+        #   "inode/directory" = [ "kitty-open.desktop" ];
+        # };
+        defaultApplications."inode/directory" =
+          lib.mkBefore [ "org.gnome.Nautilus.desktop" ];
+      };
+    };
+
+    # # Set default for opening directories
+    # xdg.mime = {
+    #   addedAssociations."inode/directory" = [ "org.gnome.Nautilus.desktop" ];
+    #   removedAssociations = { "inode/directory" = [ "kitty-open.desktop" ]; };
+    #   defaultApplications."inode/directory" =
+    #     lib.mkForce [ "org.gnome.Nautilus.desktop" ];
+    # };
+
+  };
+
+}