chore: add flake

flake.nix

@@ -0,0 +1,98 @@
+{
+	inputs = {
+		nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+		flake-utils.url = "github:numtide/flake-utils";
+
+		dream2nix.url = "github:nix-community/dream2nix";
+		dream2nix.inputs.nixpkgs.follows = "nixpkgs";
+
+		nix-precommit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+	};
+
+	outputs = {self, nixpkgs, flake-utils, dream2nix, nix-precommit-hooks, ...} :
+		let
+			supportedSystems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ];
+		in
+		flake-utils.lib.eachSystem supportedSystems (system:
+			let
+				# import nixpkgs
+				pkgs = import nixpkgs { config.allowUnfree = true; inherit system; };
+				inherit (pkgs) lib;
+
+				# python interpreter to use
+				python-interp = pkgs.python311;
+				python-interp-pkgs = python-interp.pkgs;
+
+				# dream2nix
+				module = {config, lib, dream2nix, ...}: {
+					imports = [ dream2nix.modules.dream2nix.WIP-python-pdm ];
+
+					pdm.lockfile = ./pdm.lock;
+					pdm.pyproject = ./pyproject.toml;
+
+					deps = _ : {
+						python = python-interp;
+					};
+
+					mkDerivation = {
+						src = ./.;
+						buildInputs = [
+							python-interp.pkgs.pdm-backend
+							python-interp.pkgs.editables
+						];
+					};
+
+					buildPythonPackage = {
+						format = lib.mkForce "pyproject";
+					};
+				};
+
+				# dream2nix eval
+				evaled = dream2nix.lib.evalModules {
+					packageSets.nixpkgs = pkgs;
+					modules = [
+						module
+						{
+							paths = {
+								projectRoot = ./.;
+								package = ./.;
+								projectRootFile = "flake.nix";
+							};
+						}
+					];
+					specialArgs = {
+						inherit dream2nix;
+					};
+				};
+
+				package = evaled.config.public;
+
+				pre-commit-check = nix-precommit-hooks.lib.${system}.run {
+					src = ./.;
+					hooks = {
+						ruff.enable = true;
+						statix.enable = true;
+					};
+				};
+			in
+			{
+				packages = {
+					default = package;
+				};
+
+				devShells.default = pkgs.mkShell {
+					inherit system;
+					inherit (pre-commit-check) shellHook;
+					inputsFrom = [self.packages.${system}.default.devShell];
+
+					buildInputs = with pkgs; [  ];
+				};
+
+				devShells.no-package = pkgs.mkShell {
+					inherit system;
+					inherit (pre-commit-check) shellHook;
+
+					buildInputs = with pkgs; [ python-interp pdm ];
+				};
+			});
+}