diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..c824d65
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,5 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.3.0; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.3.0/direnvrc" "sha256-0gsh4bmn8mfc1iszxvpinkkq652b3wr238qcrqp8rwybmn7pwrqf="
+fi
+
+use flake .
diff --git a/.gitignore b/.gitignore
index ea8c4bf..3816ff8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /target
+TODO
diff --git a/Cargo.lock b/Cargo.lock
index c08475b..0400c5c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,15 +4,15 @@ version = 3
 
 [[package]]
 name = "cc"
-version = "1.0.68"
+version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a72c244c1ff497a746a7e1fb3d14bd08420ecda70c8f25c7112f2781652d787"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
 
 [[package]]
 name = "libc"
-version = "0.2.97"
+version = "0.2.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12b8adadd720df158f4d70dfe7ccc6adb0472d7c55ca83445f6a5ab3e36f8fb6"
+checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
 
 [[package]]
 name = "ncurses"
@@ -27,9 +27,9 @@ dependencies = [
 
 [[package]]
 name = "pkg-config"
-version = "0.3.19"
+version = "0.3.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c"
+checksum = "6ac9a59f73473f1b8d852421e59e64809f025994837ef743615c6d0c5b305160"
 
 [[package]]
 name = "todo-rs"
diff --git a/TODO b/TODO
index 0e8447e..b2a9e3c 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1 @@
-TODO: Make a cup of tea
-TODO: Buy a bread
-TODO: Write the todo app
-DONE: Make a cup of tea
-DONE: Start the stream
-DONE: Have a breakfast
+TODO: Rust Module
diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..7948169
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,56 @@
+# default.nix
+{ lib
+, naersk
+, stdenv
+, clangStdenv
+, hostPlatform
+, targetPlatform
+, pkg-config
+, libiconv
+, rustfmt
+, cargo
+, rustc
+  # , llvmPackages # Optional
+  # , protobuf     # Optional
+}:
+
+let
+  cargoToml = (builtins.fromTOML (builtins.readFile ./Cargo.toml));
+in
+
+naersk.lib."${targetPlatform.system}".buildPackage rec {
+  src = ./.;
+
+  buildInputs = [
+    rustfmt
+    pkg-config
+    cargo
+    rustc
+    libiconv
+  ];
+  checkInputs = [ cargo rustc ];
+
+  doCheck = true;
+  CARGO_BUILD_INCREMENTAL = "false";
+  RUST_BACKTRACE = "full";
+  copyLibs = true;
+
+  # Optional things you might need:
+  #
+  # If you depend on `libclang`:
+  # LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
+  #
+  # If you depend on protobuf:
+  # PROTOC = "${protobuf}/bin/protoc";
+  # PROTOC_INCLUDE = "${protobuf}/include";
+
+  name = cargoToml.package.name;
+  version = cargoToml.package.version;
+
+  meta = with lib; {
+    description = cargoToml.package.description;
+    homepage = cargoToml.package.homepage;
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ ];
+  };
+}
\ No newline at end of file
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..1b510f6
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,48 @@
+{
+  "nodes": {
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1671096816,
+        "narHash": "sha256-ezQCsNgmpUHdZANDCILm3RvtO1xH8uujk/+EqNvzIOg=",
+        "owner": "nmattia",
+        "repo": "naersk",
+        "rev": "d998160d6a076cfe8f9741e56aeec7e267e3e114",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nmattia",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1678724065,
+        "narHash": "sha256-MjeRjunqfGTBGU401nxIjs7PC9PZZ1FBCZp/bRB3C2M=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b8afc8489dc96f29f69bec50fdc51e27883f89c1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..186d355
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,84 @@
+# flake.nix
+{
+  description = "todo-rs";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    naersk.url = "github:nmattia/naersk";
+    naersk.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, naersk }:
+    let
+      cargoToml = (builtins.fromTOML (builtins.readFile ./Cargo.toml));
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
+    in
+    {
+      overlay = final: prev: {
+        "${cargoToml.package.name}" = final.callPackage ./. { inherit naersk; };
+      };
+
+      packages = forAllSystems (system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [
+              self.overlay
+            ];
+          };
+        in
+        {
+          "${cargoToml.package.name}" = pkgs."${cargoToml.package.name}";
+        });
+
+
+      defaultPackage = forAllSystems (system: (import nixpkgs {
+        inherit system;
+        overlays = [ self.overlay ];
+      })."${cargoToml.package.name}");
+
+      checks = forAllSystems (system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [
+              self.overlay
+            ];
+          };
+        in
+        {
+          format = pkgs.runCommand "check-format"
+            {
+              buildInputs = with pkgs; [ cargo rustc ncurses ];
+            } ''
+            ${pkgs.rustfmt}/bin/cargo-fmt fmt --manifest-path ${./.}/Cargo.toml -- --check
+            ${pkgs.nixpkgs-fmt}/bin/nixpkgs-fmt --check ${./.}
+            touch $out # it worked!
+          '';
+          "${cargoToml.package.name}" = pkgs."${cargoToml.package.name}";
+        });
+      devShell = forAllSystems (system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [ self.overlay ];
+          };
+        in
+        pkgs.mkShell {
+          inputsFrom = with pkgs; [
+            pkgs."${cargoToml.package.name}"
+          ];
+          # shellHook = ''
+          #   echo "starting todo list app"
+          #   cargo run TODO
+          # '';
+          buildInputs = with pkgs; [
+            cargo 
+            rustc 
+            ncurses
+          ];
+          LIBCLANG_PATH = "${pkgs.llvmPackages.libclang.lib}/lib";
+        });
+    };
+}
\ No newline at end of file
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..f69b473
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,13 @@
+{ pkgs ? import <nixpkgs> { } }:
+let
+  todoScript = pkgs.writeScriptBin "todo-rs" ''
+    cargo run TODO
+  '';
+in pkgs.mkShell {
+  name = "todo-rs";
+  buildInputs = [ pkgs.cargo pkgs.rustc pkgs.glibc pkgs.ncurses ];
+  
+  shellHook = ''
+    cargo run TODO
+  '';
+}