default.nix

{ pkgs ? (import <nixpkgs> {}) }:
let
  python = import ./requirements.nix { inherit pkgs; };
in pkgs.stdenv.mkDerivation {
  name = "todo-backend-flask";
  src = ./todo-backend-flask;

  buildInputs = [pkgs.makeWrapper];
  propagatedBuildInputs = builtins.attrValues python.packages;

  builder = "${pkgs.bash}/bin/bash";
  args = ["-c" ''

    source $stdenv/setup
    mkdir -p $out/{bin,src}
    cp -rv ${./.}/* $out/src/

    makeWrapper \
      ${python.packages.gunicorn}/bin/gunicorn \
      $out/bin/todo-server \
      --prefix PATH : ${./todo-backend-flask} \
      --add-flags todo:app
  ''];

}