From c67cefcb80c743ff5f4347e6ae5013c79f4da7b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A1szl=C3=B3=20Vask=C3=B3?= <laszlo.vasko@outlook.com>
Date: Fri, 9 Jul 2021 00:25:52 +0200
Subject: [PATCH] flake: add `package` attribute

It could be used like this:
```nix
{
  inputs = {
    nix-doom-emacs.url = "github:vlaci/nix-doom-emacs";
  };

  outputs =
    { nixpkgs, nix-doom-emacs
    , ...
    }: {
      nixosConfigurations.exampleHost = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ({ pkgs, ... }: {
            boot.isContainer = true;
            environment.systemPackages =
              let
                doom-emacs = nix-doom-emacs.package.${system} { doomPrivateDir = ./doom.d; };
              in
              [
                doom-emacs
              ];
          })
        ];
      };
    };
}
```

See documentation in `default.nix` to see what can be passed here
---
 flake.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/flake.nix b/flake.nix
index 70c4ab3..a1f594b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -77,7 +77,7 @@
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { nixpkgs, flake-utils, ... }@inputs:
+  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
     let
       inherit (flake-utils.lib) eachDefaultSystem eachSystem;
     in
@@ -88,6 +88,10 @@
         in
         {
           devShell = pkgs.mkShell { buildInputs = [ (pkgs.python3.withPackages (ps: with ps; [ PyGithub ])) ]; };
+          package =  { dependencyOverrides ? { }, ...}@args:
+            pkgs.callPackage self (
+              args // { dependencyOverrides = (inputs // dependencyOverrides); }
+            );
         }) //
     eachSystem [ "x86_64-linux" ]
       (system: {