self: super:
let
  mkExDrv = emacsPackages: name: args:
    let
      repoMeta = super.lib.importJSON (../repos/exwm/. + "/${name}.json");
    in
    emacsPackages.melpaBuild (
      args // {
        pname = name;
        ename = name;
        version = repoMeta.version;
        commit = repoMeta.rev;

        recipe = builtins.toFile "recipe" ''
          (${name} :fetcher github
          :repo "ch11ng/${name}")
        '';

        src = super.fetchFromGitHub {
          owner = "ch11ng";
          repo = name;
          inherit (repoMeta) rev sha256;
        };
      }
    );

in
{
  emacsPackagesFor = emacs: (
    (super.emacsPackagesFor emacs).overrideScope' (
      eself: esuper:
        let
          melpaStablePackages = esuper.melpaStablePackages.override {
            archiveJson = ../repos/melpa/recipes-archive-melpa.json;
          };

          melpaPackages = esuper.melpaPackages.override {
            archiveJson = ../repos/melpa/recipes-archive-melpa.json;
          };

          elpaPackages = esuper.elpaPackages.override {
            generated = ../repos/elpa/elpa-generated.nix;
          };

          nongnuPackages = esuper.nongnuPackages.override {
            generated = ../repos/nongnu/nongnu-generated.nix;
          };

          epkgs = esuper.override {
            inherit melpaStablePackages melpaPackages elpaPackages
              nongnuPackages;
          };

        in
        epkgs // {
          xelb = mkExDrv eself "xelb" {
            packageRequires = [ eself.cl-generic eself.emacs ];
          };

          exwm = mkExDrv eself "exwm" {
            packageRequires = [ eself.xelb ];
          };
        }
    )
  );

}