Init flake and make project buildable

package.nix

@@ -0,0 +1,50 @@
+{
+  config,
+  lib,
+  dream2nix,
+  pkgs,
+  ...
+}: let
+  pyproject = lib.importTOML (config.mkDerivation.src + /pyproject.toml);
+in rec {
+  imports = [
+    dream2nix.modules.dream2nix.pip
+  ];
+
+  inherit (pyproject.project) name version;
+
+  deps = {nixpkgs, ...}: {
+    python = nixpkgs.python3;
+    inherit (nixpkgs) openssl;
+  };
+
+  mkDerivation = {
+    src = lib.cleanSourceWith {
+      src = lib.cleanSource ./.;
+      filter = name: type:
+        !(builtins.any (x: x) [
+          (lib.hasSuffix ".nix" name)
+          (lib.hasPrefix "." (builtins.baseNameOf name))
+          (lib.hasSuffix "flake.lock" name)
+        ]);
+    };
+  };
+
+  buildPythonPackage = {
+    pyproject = true; #
+    pythonImportsCheck = [
+      "hcpy"
+    ];
+  };
+
+  pip = {
+    # requirementsList = lib.splitString "\n" (builtins.readFile (config.mkDerivation.src + /requirements.txt));
+    requirementsList =
+      pyproject.build-system.requires
+      or []
+      ++ pyproject.project.dependencies or [];
+    flattenDependencies = true;
+
+    overrides.sslpsk.mkDerivation.buildInputs = [config.deps.openssl];
+  };
+}