depot/third_party/nixpkgs/pkgs/development/python-modules/psycopg2/default.nix

{ stdenv
, lib
, buildPythonPackage
, pythonOlder
, isPyPy
, fetchPypi
, postgresql
, openssl
, sphinxHook
, sphinx-better-theme
, buildPackages
}:

buildPythonPackage rec {
  pname = "psycopg2";
  version = "2.9.9";
  format = "setuptools";

  # Extension modules don't work well with PyPy. Use psycopg2cffi instead.
  # c.f. https://github.com/NixOS/nixpkgs/pull/104151#issuecomment-729750892
  disabled = pythonOlder "3.6" || isPyPy;

  outputs = [ "out" "doc" ];

  src = fetchPypi {
    inherit pname version;
    hash = "sha256-0UVL3pP7HiJBZoEWlNYA50ZDDABvuwMeoG7MLqQb8VY=";
  };

  postPatch = ''
    # Preferably upstream would not depend on pg_config because config scripts are incompatible with cross-compilation, however postgresql's pc file is lacking information.
    # some linker flags are added but the linker ignores them because they're incompatible
    # https://github.com/psycopg/psycopg2/blob/89005ac5b849c6428c05660b23c5a266c96e677d/setup.py
    substituteInPlace setup.py \
      --replace "self.pg_config_exe = self.build_ext.pg_config" 'self.pg_config_exe = "${lib.getExe' buildPackages.postgresql "pg_config"}"'
  '';

  nativeBuildInputs = [
    sphinxHook
    sphinx-better-theme
  ];

  buildInputs = [
    postgresql
  ] ++ lib.optionals stdenv.isDarwin [
    openssl
  ];

  sphinxRoot = "doc/src";

  # Requires setting up a PostgreSQL database
  doCheck = false;

  pythonImportsCheck = [
    "psycopg2"
  ];

  disallowedReferences = lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [ buildPackages.postgresql ];

  meta = with lib; {
    description = "PostgreSQL database adapter for the Python programming language";
    homepage = "https://www.psycopg.org";
    license = with licenses; [ lgpl3Plus zpl20 ];
    maintainers = with maintainers; [ ];
  };
}