Working on custom vscode module but environment variable flag isn't properly expanding due to single quotes.

[wbehrens-on-gh]

I was hoping to create a quick and dirty wrapper for vscode for personal use but I ran into an issue. Here's what I have

module.nix

{
  wlib,
  config,
  pkgs,
  lib,
  ...
}:
let
  cfg = config;
in
{
  imports = [ wlib.modules.default ];
  options = {
    extensions = lib.mkOption {
      type = lib.types.listOf lib.types.package;
      default = [ ];
    };
    userSettings = lib.mkOption {
      type = lib.types.attrsOf lib.types.anything;
      default = { };
    };
  };
  config = {
    package = lib.mkDefault pkgs.vscode;
    runShell = let
      settingsFile = pkgs.writeText "settings.json" (builtins.toJSON cfg.userSettings);
    in [''
      tmp_user_data_dir=$(mktemp -d)
      echo "Created session directory: $tmp_user_data_dir"
      cp ${settingsFile} "$tmp_user_data_dir/settings.json"
    ''];
    flags = lib.mkMerge [
      (lib.mkIf (cfg.extensions != [ ]) {
        "--extensions-dir" = "${pkgs.buildEnv {
          name = "vscode-extensions";
          paths = cfg.extensions;
        }}/share/vscode/extensions";
      })
      {
        "--user-data-dir" = wlib.escapeShellArgWithEnv "\$tmp_user_data_dir";
      }
    ];
  };
}

now I'm having an issue where the parameter --user-data-dir the value $tmp_user_data_dir is being rendered as '$tmp_user_data_dir' as single quotes causing it to not properly expand. Doing as much digging as I can I can't seem to find what the correct way to prevent this is. I'm trying to set the settings to a temp directory as vscode requires the user-data-dir to be writable else it crashes on startup.

[BirdeeHub]

per-item

https://birdeehub.github.io/nix-wrapper-modules/modules/makeWrapper.html#flagsnameesc-fn

default

https://birdeehub.github.io/nix-wrapper-modules/modules/makeWrapper.html#escapingfunction

example

nix-wrapper-modules/wrapperModules/n/nh/module.nix

Lines 19 to 24 in dc51840

	env = {
	"NH_FLAKE" = {
	data = "${config.flake}";
	esc-fn = toString;
	};
	};

^ this one is for the env set, but flags can do this too