flake: Initialise new repository

flake.nix

@@ -0,0 +1,45 @@
+{
+  description = "floccus";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    darwin = {
+      url = "github:LnL7/nix-darwin";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    home-manager = {
+      url = "github:nix-community/home-manager";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    agenix = {
+      url = "github:ryantm/agenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    {
+      nixpkgs,
+      darwin,
+      ...
+    }@inputs:
+    {
+      darwinConfigurations.Mac-von-Jan = darwin.lib.darwinSystem {
+        system = "aarch64-darwin";
+        specialArgs = {
+          inherit inputs;
+        };
+        modules = [ ./hosts/mac/configuration.nix ];
+      };
+
+      nixosConfigurations.galanthus = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        specialArgs = {
+          inherit inputs;
+        };
+        modules = [ ./hosts/galanthus/configuration.nix ];
+      };
+
+      formatter.aarch64-darwin = nixpkgs.legacyPackages.aarch64-darwin.nixfmt-tree;
+    };
+}