From 0a6227d667d1d2bc6a79de24fd12becc523f2e2f Mon Sep 17 00:00:00 2001
From: Imran Hossain <github@imranh.xyz>
Date: Sun, 11 Apr 2021 17:46:27 -0400
Subject: [PATCH] flake.nix: Add packages and defaultPackages outputs (#1913)

---
 flake.nix | 53 +++++++++++++++++++++++++++++++++++------------------
 1 file changed, 35 insertions(+), 18 deletions(-)

diff --git a/flake.nix b/flake.nix
index 6dfc52be..a3afaab3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,26 +1,43 @@
 {
   description = "Home Manager for Nix";
 
-  outputs = { self, nixpkgs }: rec {
-    nixosModules.home-manager = import ./nixos;
-    nixosModule = self.nixosModules.home-manager;
+  outputs = { self, nixpkgs }:
+    let
+      # List of systems supported by home-manager binary
+      supportedSystems = nixpkgs.lib.platforms.unix;
 
-    darwinModules.home-manager = import ./nix-darwin;
-    darwinModule = self.darwinModules.home-manager;
+      # Function to generate a set based on supported systems
+      forAllSystems = f:
+        nixpkgs.lib.genAttrs supportedSystems (system: f system);
 
-    lib = {
-      hm = import ./modules/lib { lib = nixpkgs.lib; };
-      homeManagerConfiguration = { configuration, system, homeDirectory
-        , username, extraSpecialArgs ? { }
-        , pkgs ? builtins.getAttr system nixpkgs.outputs.legacyPackages
-        , check ? true }@args:
-        import ./modules {
-          inherit pkgs check extraSpecialArgs;
-          configuration = { ... }: {
-            imports = [ configuration ];
-            home = { inherit homeDirectory username; };
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+    in rec {
+      nixosModules.home-manager = import ./nixos;
+      nixosModule = self.nixosModules.home-manager;
+
+      darwinModules.home-manager = import ./nix-darwin;
+      darwinModule = self.darwinModules.home-manager;
+
+      packages = forAllSystems (system: {
+        home-manager = nixpkgsFor.${system}.callPackage ./home-manager { };
+      });
+
+      defaultPackage =
+        forAllSystems (system: self.packages.${system}.home-manager);
+
+      lib = {
+        hm = import ./modules/lib { lib = nixpkgs.lib; };
+        homeManagerConfiguration = { configuration, system, homeDirectory
+          , username, extraSpecialArgs ? { }
+          , pkgs ? builtins.getAttr system nixpkgs.outputs.legacyPackages
+          , check ? true }@args:
+          import ./modules {
+            inherit pkgs check extraSpecialArgs;
+            configuration = { ... }: {
+              imports = [ configuration ];
+              home = { inherit homeDirectory username; };
+            };
           };
-        };
+      };
     };
-  };
 }