Desktop/vscode: configure nil to use nixpkgs-fmt to format

roles/common/programs/helix.nix

@@ -22,12 +22,17 @@
           indent-guides.render = true;
         };
       };
-      languages = [
-        {
-          name = "nix";
-          formatter.command = "nixpkgs-fmt";
-        }
-      ];
+    };
+    # The builtin languages options have issues
+    # https://github.com/nix-community/home-manager/issues/3299
+    xdg.configFile."helixLanguages" = {
+      target = "helix/languages.toml";
+      text = ''
+        [language-server.nil]
+        config.nil.formatting.command = [ "nixpkgs-fmt" ]
+        [[language]]
+        name = "nix"
+      '';
     };
   };
 }

roles/desktop/programs/vscode.nix

@@ -2,7 +2,11 @@
 let inputs = flakeSelf.inputs; in
 {
 	nixpkgs.overlays = [ inputs.catppuccin-vsc.overlays.default ];
-	home-manager.users.toast.programs.vscode = {
+	home-manager.users.toast = {
+		home.packages = with pkgs; [
+			nixpkgs-fmt
+		];
+		programs.vscode = {
 			enable = true;
 			package = pkgs.vscodium;
 			mutableExtensionsDir = false;
@@ -25,8 +29,12 @@ let inputs = flakeSelf.inputs; in
 				"editor.semanticHighlighting.enabled" = true;
 				"nix.enableLanguageServer" = true;
 				"nix.serverPath" = "${pkgs.nil}/bin/nil";
+				"nix.serverSettings" = {
+					"nil"."formatting"."command" = [ "nixpkgs-fmt" ];
+				};
 				"terminal.integrated.minimumContrastRatio" = 1;
 				"window.titleBarStyle" = "custom";
 			};
 		};
+	};
 }