added basic flake

.envrc

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+use flake

flake.nix

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+/*
+TODO
+1. Find and replace "joystick-controller-client" with your package name for **ALL FILES IN REPOSITORY**
+2. Add a flake description that describes the workspace on line 27
+3. Add a package description on line 70
+4. (optional) uncomment `nativeBuildInputs` and `buildInputs` on lines 43 and 44 if you need openssl
+5. (optional) set your project homepage, license, and maintainers list on lines 48-51
+6. (optional) uncomment the NixOS module and update it for your needs
+7. Delete this comment block
+*/
+
+/*
+Some utility commands:
+- `nix flake update --commit-lock-file`
+- `nix flake lock update-input <input>`
+- `nix build .#joystick-controller-client` or `nix build .`
+- `nix run .#joystick-controller-client` or `nix run .`
+*/
+
+{
+  description = "";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { self, nixpkgs, rust-overlay }:
+    let
+      overlays = [ (import rust-overlay) ];
+      system = "x86_64-linux";
+      pkgs = import nixpkgs {
+        inherit system overlays;
+      };
+      rustSettings = with pkgs; {
+        src = ./.;
+        #nativeBuildInputs = [ pkg-config ];
+        #buildInputs = [ openssl ];
+        cargoHash = nixpkgs.lib.fakeHash;
+      };
+      meta = with nixpkgs.lib; {
+        #homepage = "https://example.com";
+        #license = [ licenses.gpl3 ];
+        platforms = [ system ];
+        #maintainers = with maintainers; [ ];
+      };
+    in {
+      devShells.${system}.default = with pkgs; mkShell {
+        packages = [
+          (pkgs.rust-bin.stable.latest.default.override {
+            extensions = [ "rust-src" ];
+          })
+          cargo-edit
+          bacon
+        ];
+        inputsFrom = with self.packages.${system}; [ joystick-controller-client ];
+      };
+      packages.${system} = {
+        default = self.packages.${system}.joystick-controller-client;
+        joystick-controller-client = pkgs.rustPlatform.buildRustPackage (rustSettings // {
+          pname = "joystick-controller-client";
+          version = "0.1.0";
+          buildAndTestSubdir = "joystick-controller-client";
+          cargoHash = "sha256-+TaGIiKf+Pz2bTABeG8aCZz0/ZTCKl5398+qbas4Nvo=";
+          meta = meta // {
+            description = "";
+          };
+        });
+      };
+      /*
+      nixosModules.default = { config, ... }: let
+        lib = nixpkgs.lib;
+      in {
+        options.services.joystick-controller-client = {
+          enable = lib.mkEnableOption (lib.mdDoc "joystick-controller-client service");
+          package = lib.mkOption {
+            type = lib.types.package;
+            default = self.packages.${system}.joystick-controller-client;
+            defaultText = "pkgs.joystick-controller-client";
+            description = lib.mdDoc ''
+              The joystick-controller-client package that should be used.
+            '';
+          };
+          port = lib.mkOption {
+            type = lib.types.port;
+            default = 8000;
+            description = lib.mdDoc ''
+              The port at which to run.
+            '';
+          };
+        };
+        config.systemd.services.joystick-controller-client = let
+          cfg = config.services.joystick-controller-client;
+          pkg = self.packages.${system}.joystick-controller-client;
+        in lib.mkIf cfg.enable {
+          description = pkg.meta.description;
+          after = [ "network.target" ];
+          wantedBy = [ "network.target" ];
+          serviceConfig = {
+            ExecStart = ''
+              ${cfg.package}/bin/joystick-controller-client --port ${builtins.toString cfg.port}
+            '';
+            Restart = "always";
+            DynamicUser = true;
+          };
+        };
+      };
+      */
+    };
+}
+