feat(vscode): inline nix4vscode call

nix/home-manager/programs/vscode/default.nix

@@ -1,4 +1,10 @@
-{ pkgs, repoFlake, ... }:
+{
+  config,
+  pkgs,
+  repoFlake,
+  lib,
+  ...
+}:
 let
   pkgsVscodium = import repoFlake.inputs.nixpkgs-vscodium { inherit (pkgs) system config; };
 in
@@ -48,19 +54,43 @@ in
 
             golang.go
             jeff-hykin.better-go-syntax
-
-            ibecker.treefmt-vscode
           ]
         )
       )
-      ++ [
-        (pkgsVscodium.vscode-utils.extensionFromVscodeMarketplace {
-          name = "markdown-oxide";
-          publisher = "felixzeller";
-          version = "1.1.0";
-          sha256 = "07l37hkg106m3nl9530l7i39iw1kibckv1zi4n23gbp7srdrwbs3";
-        })
-      ];
+      ++ (
+        let
+          nix4vscodeConfig = pkgs.writeText "nix4vscode.toml" ''
+            vscode_version = "${config.programs.vscode.package.version}"
+
+            [[extensions]]
+            publisher_name = "FelixZeller"
+            extension_name = "markdown-oxide"
+
+            [[extensions]]
+            publisher_name = "ibecker"
+            extension_name = "treefmt-vscode"
+          '';
+          nix4vscode =
+            pkgs.runCommand "nix4vscode.nix"
+              {
+                __noChroot = true;
+                nativeBuildInputs = [ repoFlake.inputs.nix4vscode.packages.${pkgs.stdenv.system}.default ];
+              }
+              ''
+                export RUST_BACKTRACE=full
+                export HOME=$(mktemp -d)
+                nix4vscode ${nix4vscodeConfig} > $out
+              '';
+          nix4vscodeExtensions = builtins.removeAttrs (pkgs.callPackage nix4vscode { }) [
+            "override"
+            "overrideDerivation"
+          ];
+          nix4vscodeExtensions' = lib.attrsets.mapAttrsToList (
+            _: v: builtins.head (builtins.attrValues v)
+          ) nix4vscodeExtensions;
+        in
+        nix4vscodeExtensions'
+      );
     mutableExtensionsDir = true;
   };