First pass at a Nix flake for my laptop

Heavily inspired by these:
- https://github.com/zmre/mac-nix-simple-example
- https://github.com/dustinlyons/nixos-config

flake.nix

@@ -0,0 +1,57 @@
+{
+  description = "A flake for all my stuff";
+  inputs = {
+    # Where we get most of our software. Giant mono repo with recipes
+    # called derivations that say how to build software.
+    nixpkgs.url = "github:nixos/nixpkgs";
+
+    # Controls system level software and settings including fonts
+    darwin = {
+      url = "github:lnl7/nix-darwin";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    # Manages things in home directory
+    home-manager = {
+      url = "github:nix-community/home-manager";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    # Manage Homebrew itself
+    nix-homebrew.url = "github:zhaofengli-wip/nix-homebrew";
+
+  }; # end inputs
+  outputs = { self, nixpkgs, darwin, home-manager, nix-homebrew, ... }: {
+    # This is only set to work with x86 macOS right now... that will need to be updated
+    darwinConfigurations.Blue-Rock = darwin.lib.darwinSystem {
+      system = "x86_64-darwin";
+      pkgs = import nixpkgs { system = "x86_64-darwin"; };
+      modules = [
+        nix-homebrew.darwinModules.nix-homebrew
+        {
+          nix-homebrew = {
+            # Install Homebrew under the default prefix
+            enable = true;
+
+            # User owning the Homebrew prefix
+            user = "gene.liverman";
+
+            # Automatically migrate existing Homebrew installations
+            autoMigrate = true;
+          };
+        }
+
+        ./modules/darwin
+
+        home-manager.darwinModules.home-manager
+        {
+          home-manager = {
+            useGlobalPkgs = true;
+            useUserPackages = true;
+            users."gene.liverman".imports = [ ./modules/home-manager ];
+          };
+        }
+      ]; # end modules
+    }; # end of darwinConfigurations.Blue-Rock
+  };
+}