nixos-configuration/pkgs/overlays/cosmic-packages.nix

{ inputs ? import ../../inputs.nix {}}:

self: super:

let
  nixos-cosmic = inputs.cosmic-modules;
  cosmicPkgsMainDir = builtins.readDir "${nixos-cosmic}/pkgs";
  cosmicPkgsDirs = builtins.filter (v: cosmicPkgsMainDir."${v}" == "directory") (builtins.attrNames cosmicPkgsMainDir);

  # Pinned unstable nixpkgs
  futureNixpkgsSrc = builtins.fetchTarball {
    name = "nixpkgs";
    url = "https://github.com/NixOS/nixpkgs/archive/c3aa7b8938b17aebd2deecf7be0636000d62a2b9.tar.gz";
    sha256 = "1ds3yjcy52l8d3rkxr3b7h9c0c3nly079bgakjaasnfjj3xprrwr";
  };

  # Take rustPackages from staging nixpkgs
  futureNixpkgs = import futureNixpkgsSrc {
    localSystem = self.stdenv.buildPlatform;
    config = self.config;
  } // (if self.stdenv.buildPlatform == self.stdenv.hostPlatform then {} else {
    crossSystem = self.stdenv.hostPlatform;
  });
  futureRustPackages = futureNixpkgs.rustPackages;

  # Create nixpkgs with future rust
  nixpkgsWithFutureRust = self.extend (futureSelf: futureSuper: {
    rustPackages = futureRustPackages;
  });

  # Create cosmicPkgs that contains cosmic packages built from nixpkgs with future rust
  cosmicOverlay = cosmicSelf: cosmicSuper: builtins.listToAttrs (
    builtins.map (v: {name = v; value = nixpkgsWithFutureRust.callPackage "${nixos-cosmic}/pkgs/${v}/package.nix" {};}) cosmicPkgsDirs
  );
  cosmicNixpkgs = import inputs.nixpkgs {
    localSystem = self.stdenv.buildPlatform;
    config = self.config;
    overlays = [ cosmicOverlay ];
  } // (if self.stdenv.buildPlatform == self.stdenv.hostPlatform then {} else {
    crossSystem = self.stdenv.hostPlatform;
  });
in

builtins.listToAttrs (
  builtins.map (v: {name = v; value = cosmicNixpkgs.${v};}) cosmicPkgsDirs
)