add flake support

.envrc

@@ -0,0 +1,11 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.2.1; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.1/direnvrc" "sha256-zelF0vLbEl5uaqrfIzbgNzJWGmLzCmYAkInj/LNxvKs="
+fi
+
+nix_direnv_watch_file devenv.nix
+nix_direnv_watch_file devenv.lock
+nix_direnv_watch_file devenv.yaml
+if ! use flake . --impure
+then
+  echo "devenv could not be build. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
+fi

.gitignore

@@ -1 +1,3 @@
 target
+.devenv
+.direnv

flake.nix

@@ -0,0 +1,42 @@
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+    naersk = {
+      url = "github:nix-community/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, fenix, flake-utils, naersk, nixpkgs }:
+    flake-utils.lib.eachDefaultSystem (system: {
+      packages.default =
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          toolchain = with fenix.packages.${system}; combine [
+            minimal.cargo
+            minimal.rustc
+          ];
+        in
+        (naersk.lib.${system}.override {
+          cargo = toolchain;
+          rustc = toolchain;
+        }).buildPackage {
+          hardeningDisable = [ "all" ];
+          buildInputs = with pkgs; [
+            clang
+            zlib
+          ];
+          nativeBuildInputs = with pkgs; [
+            elfutils
+            pkg-config
+          ];
+          src = ./.;
+        };
+    });
+}
+