final: prev: {
  mkEmacs = {
    pkgs,
    emacs,
  }: let
    mkEmacsPackage = {
      epkgs,
      pname,
      version,
      src,
      deps ? [],
    }:
      epkgs.callPackage (
        {trivialBuild}:
          trivialBuild {
            inherit pname version src;
            buildInputs = deps;
            propagatedUserEnvPkgs = deps;
          }
      ) {inherit (epkgs) trivialBuild;};
  in
    pkgs.emacsWithPackagesFromUsePackage {
      package = emacs;
      defaultInitFile = true;
      config = ./config.el;
      extraEmacsPackages = epkgs:
        builtins.attrValues {
          inherit
            (epkgs)
            spacious-padding
            mood-line
            which-key
            helm
            base16-theme
            nix-mode
            rust-mode
            haskell-mode
            envrc
            eat
            vterm
            ;
          treesit-grammars = epkgs.treesit-grammars.with-all-grammars;
        };
      override = _: prev: {
        use-package = prev.emacs;
        savehist = prev.emacs;
      };
    };
}