Add vscode overlay that pins 1.52.1 so that liveshare works

overlays/vscode/with-extensions.nix

@@ -0,0 +1,73 @@
+{ lib, runCommand, buildEnv, vscode, makeWrapper, vscodeExtensions ? [ ] }:
+
+/* `vscodeExtensions`
+   :  A set of vscode extensions to be installed alongside the editor. Here's a an
+      example:
+
+      ~~~
+      vscode-with-extensions.override {
+
+        # When the extension is already available in the default extensions set.
+        vscodeExtensions = with vscode-extensions; [
+          bbenoist.Nix
+        ]
+
+        # Concise version from the vscode market place when not available in the default set.
+        ++ vscode-utils.extensionsFromVscodeMarketplace [
+          {
+            name = "code-runner";
+            publisher = "formulahendry";
+            version = "0.6.33";
+            sha256 = "166ia73vrcl5c9hm4q1a73qdn56m0jc7flfsk5p5q41na9f10lb0";
+          }
+        ];
+      }
+      ~~~
+
+      This expression should fetch
+       -  the *nix* vscode extension from whatever source defined in the
+          default nixpkgs extensions set `vscodeExtensions`.
+
+       -  the *code-runner* vscode extension from the marketplace using the
+          following url:
+
+          ~~~
+          https://bbenoist.gallery.vsassets.io/_apis/public/gallery/publisher/bbenoist/extension/nix/1.0.1/assetbyname/Microsoft.VisualStudio.Services.VSIXPackage
+          ~~~
+
+      The original `code` executable will be wrapped so that it uses the set of pre-installed / unpacked
+      extensions as its `--extensions-dir`.
+*/
+
+let
+
+  inherit (vscode) executableName;
+  wrappedPkgVersion = lib.getVersion vscode;
+  wrappedPkgName = lib.removeSuffix "-${wrappedPkgVersion}" vscode.name;
+
+  combinedExtensionsDrv = buildEnv {
+    name = "vscode-extensions";
+    paths = vscodeExtensions;
+  };
+
+  # When no extensions are requested, we simply redirect to the original
+  # non-wrapped vscode executable.
+in runCommand "${wrappedPkgName}-with-extensions-${wrappedPkgVersion}" {
+  buildInputs = [ vscode makeWrapper ];
+  dontPatchELF = true;
+  dontStrip = true;
+  meta = vscode.meta;
+} ''
+  mkdir -p "$out/bin"
+  mkdir -p "$out/share/applications"
+  mkdir -p "$out/share/pixmaps"
+
+  ln -sT "${vscode}/share/pixmaps/code.png" "$out/share/pixmaps/code.png"
+  ln -sT "${vscode}/share/applications/${executableName}.desktop" "$out/share/applications/${executableName}.desktop"
+  ln -sT "${vscode}/share/applications/${executableName}-url-handler.desktop" "$out/share/applications/${executableName}-url-handler.desktop"
+  makeWrapper "${vscode}/bin/${executableName}" "$out/bin/${executableName}" ${
+    lib.optionalString (vscodeExtensions != [ ]) ''
+      --add-flags "--extensions-dir ${combinedExtensionsDrv}/share/vscode/extensions"
+    ''
+  }
+''