feat: load config from twyn.toml if it exists

Author: sdn4z

README.md

@@ -149,7 +149,7 @@ twyn run --selector-method <method>
 
 You can save your configurations in a `.toml` file, so you don't need to specify them everytime you run `Twyn` in your terminal.
 
-By default, it will try to find a `pyproject.toml` file in your working directory when it's trying to load your configurations.
+By default, it will try to find a `twyn.roml` file in your working directory when it's trying to load your configurations. If it does not find it, it will fallback to `pyproject.toml`.
 However, you can specify a config file as follows:
 
 ```sh

src/twyn/base/constants.py

@@ -27,6 +27,7 @@
 
 DEFAULT_SELECTOR_METHOD = "all"
 DEFAULT_PROJECT_TOML_FILE = "pyproject.toml"
+DEFAULT_TWYN_TOML_FILE = "twyn.toml"
 DEFAULT_TOP_PYPI_PACKAGES = "https://hugovk.github.io/top-pypi-packages/top-pypi-packages.min.json"
 
 

src/twyn/cli.py

@@ -155,7 +155,7 @@ def allowlist() -> None:
 @click.option("--config", type=click.STRING)
 @click.argument("package_name")
 def add(package_name: str, config: str) -> None:
-    fh = FileHandler(config or DEFAULT_PROJECT_TOML_FILE)
+    fh = FileHandler(config or ConfigHandler.get_default_config_file_path())
     ConfigHandler(fh).add_package_to_allowlist(package_name)
 
 

src/twyn/config/config_handler.py

@@ -1,14 +1,16 @@
 import logging
 from dataclasses import asdict, dataclass
 from enum import Enum
-from typing import Optional
+from pathlib import Path
+from typing import Any, Optional, Union
 
 from tomlkit import TOMLDocument, dumps, parse, table
 
 from twyn.base.constants import (
     DEFAULT_PROJECT_TOML_FILE,
     DEFAULT_SELECTOR_METHOD,
     DEFAULT_TOP_PYPI_PACKAGES,
+    DEFAULT_TWYN_TOML_FILE,
     SELECTOR_METHOD_KEYS,
     AvailableLoggingLevels,
 )
@@ -145,6 +147,16 @@ def _read_toml(self) -> TOMLDocument:
                 return TOMLDocument()
             raise TOMLError(f"Error reading toml from {self.file_handler.file_path}") from None
 
+    @staticmethod
+    def get_default_config_file_path() -> str:
+        """Return `twyn.toml` if it exists. If not, it returns the default `pyproject.toml` file.
+
+        It does not fail if the latter does not exist, as it is not mandatory to have a config file to run twyn.
+        """
+        if Path(DEFAULT_TWYN_TOML_FILE).exists():
+            return DEFAULT_TWYN_TOML_FILE
+        return DEFAULT_PROJECT_TOML_FILE
+
 
 def _get_logging_level(
     cli_verbosity: AvailableLoggingLevels,
@@ -160,8 +172,8 @@ def _get_logging_level(
     return cli_verbosity
 
 
-def _serialize_config(x):
-    def _value_to_for_config(v):
+def _serialize_config(x: Any) -> Union[Any, str, list[Any]]:
+    def _value_to_for_config(v: Any) -> Union[str, list[Any], Any]:
         if isinstance(v, Enum):
             return v.name
         elif isinstance(v, set):

src/twyn/file_handler/file_handler.py

@@ -19,9 +19,6 @@ class FileHandler(BaseFileHandler):
     def __init__(self, file_path: str) -> None:
         self.file_path = self._get_file_path(file_path)
 
-    def _get_file_path(self, file_path: str) -> Path:
-        return Path(os.path.abspath(os.path.join(os.getcwd(), file_path)))
-
     def is_handler_of_file(self, name: str) -> bool:
         return self._get_file_path(name) == self.file_path
 
@@ -66,3 +63,6 @@ def delete(self, delete_parent_dir: bool = False) -> None:
                 logger.exception(
                     "Directory not empty or not enough permissions. Cannot be removed: %s", self.file_path.parent
                 )
+
+    def _get_file_path(self, file_path: str) -> Path:
+        return Path(os.path.abspath(os.path.join(os.getcwd(), file_path)))

src/twyn/main.py

@@ -4,7 +4,6 @@
 from rich.progress import track
 
 from twyn.base.constants import (
-    DEFAULT_PROJECT_TOML_FILE,
     SELECTOR_METHOD_MAPPING,
     AvailableLoggingLevels,
     SelectorMethod,
@@ -35,7 +34,7 @@ def check_dependencies(
     use_track: bool = False,
 ) -> TyposquatCheckResultList:
     """Check if dependencies could be typosquats."""
-    config_file_handler = FileHandler(config_file or DEFAULT_PROJECT_TOML_FILE)
+    config_file_handler = FileHandler(config_file or ConfigHandler.get_default_config_file_path())
     config = ConfigHandler(config_file_handler, enforce_file=False).resolve_config(
         verbosity=verbosity, selector_method=selector_method, dependency_file=dependency_file
     )

tests/core/__init__.py tests/config/__init__.pytests/core/__init__.py renamed to tests/config/__init__.py

@@ -1,11 +1,17 @@
 import dataclasses
 from copy import deepcopy
 from pathlib import Path
-from unittest.mock import patch
+from typing import NoReturn
+from unittest.mock import Mock, patch
 
 import pytest
 from tomlkit import TOMLDocument, dumps, parse
-from twyn.base.constants import DEFAULT_PROJECT_TOML_FILE, DEFAULT_TOP_PYPI_PACKAGES, AvailableLoggingLevels
+from twyn.base.constants import (
+    DEFAULT_PROJECT_TOML_FILE,
+    DEFAULT_TOP_PYPI_PACKAGES,
+    DEFAULT_TWYN_TOML_FILE,
+    AvailableLoggingLevels,
+)
 from twyn.config.config_handler import ConfigHandler, ReadTwynConfiguration, TwynConfiguration
 from twyn.config.exceptions import (
     AllowlistPackageAlreadyExistsError,
@@ -16,19 +22,21 @@
 from twyn.file_handler.exceptions import PathNotFoundError
 from twyn.file_handler.file_handler import FileHandler
 
+from tests.conftest import create_tmp_file
+
 
-class TestConfig:
-    def throw_exception(self):
+class TestConfigHandler:
+    def throw_exception(self) -> NoReturn:
         raise PathNotFoundError
 
     @patch("twyn.file_handler.file_handler.FileHandler.read")
-    def test_enforce_file_error(self, mock_is_file):
+    def test_enforce_file_error(self, mock_is_file: Mock) -> None:
         mock_is_file.side_effect = self.throw_exception
         with pytest.raises(TOMLError):
             ConfigHandler(FileHandler(DEFAULT_PROJECT_TOML_FILE), enforce_file=True).resolve_config()
 
     @patch("twyn.file_handler.file_handler.FileHandler.read")
-    def test_no_enforce_file_on_non_existent_file(self, mock_is_file):
+    def test_no_enforce_file_on_non_existent_file(self, mock_is_file: Mock) -> None:
         """Resolving the config without enforcing the file to be present gives you defaults."""
         mock_is_file.side_effect = self.throw_exception
         config = ConfigHandler(FileHandler(DEFAULT_PROJECT_TOML_FILE), enforce_file=False).resolve_config()
@@ -41,18 +49,18 @@ def test_no_enforce_file_on_non_existent_file(self, mock_is_file):
             pypi_reference=DEFAULT_TOP_PYPI_PACKAGES,
         )
 
-    def test_config_raises_for_unknown_file(self):
+    def test_config_raises_for_unknown_file(self) -> None:
         with pytest.raises(TOMLError):
             ConfigHandler(FileHandler("non-existent-file.toml")).resolve_config()
 
-    def test_read_config_values(self, pyproject_toml_file):
+    def test_read_config_values(self, pyproject_toml_file: Path) -> None:
         config = ConfigHandler(file_handler=FileHandler(pyproject_toml_file)).resolve_config()
         assert config.dependency_file == "my_file.txt"
         assert config.selector_method == "all"
         assert config.logging_level == AvailableLoggingLevels.debug
         assert config.allowlist == {"boto4", "boto2"}
 
-    def test_get_twyn_data_from_file(self, pyproject_toml_file):
+    def test_get_twyn_data_from_file(self, pyproject_toml_file: Path) -> None:
         handler = ConfigHandler(FileHandler(str(pyproject_toml_file)))
 
         toml = handler._read_toml()
@@ -65,7 +73,7 @@ def test_get_twyn_data_from_file(self, pyproject_toml_file):
             pypi_reference=None,
         )
 
-    def test_write_toml(self, pyproject_toml_file):
+    def test_write_toml(self, pyproject_toml_file: Path) -> None:
         handler = ConfigHandler(FileHandler(pyproject_toml_file))
         toml = handler._read_toml()
 
@@ -105,11 +113,35 @@ def test_write_toml(self, pyproject_toml_file):
             }
         }
 
+    def test_get_default_config_file_path_twyn_file_exists(self, tmp_path: Path, pyproject_toml_file: Path) -> None:
+        assert pyproject_toml_file.exists()
+        twyn_path = tmp_path / DEFAULT_TWYN_TOML_FILE
+        with (
+            create_tmp_file(twyn_path, ""),
+            patch("twyn.config.config_handler.DEFAULT_TWYN_TOML_FILE", new=str(twyn_path)),
+            patch("twyn.config.config_handler.DEFAULT_PROJECT_TOML_FILE", new=str(pyproject_toml_file)),
+        ):
+            assert twyn_path.exists()
+
+            assert ConfigHandler.get_default_config_file_path() == str(twyn_path)
+
+    def test_get_default_config_file_path_twyn_file_does_not_exist(
+        self, tmp_path: Path, pyproject_toml_file: Path
+    ) -> None:
+        assert pyproject_toml_file.exists()
+        twyn_path = tmp_path / DEFAULT_TWYN_TOML_FILE
+        with (
+            patch("twyn.config.config_handler.DEFAULT_TWYN_TOML_FILE", new=str(twyn_path)),
+            patch("twyn.config.config_handler.DEFAULT_PROJECT_TOML_FILE", new=str(pyproject_toml_file)),
+        ):
+            assert not twyn_path.exists()
+            assert ConfigHandler.get_default_config_file_path() == str(pyproject_toml_file)
+
 
 class TestAllowlistConfigHandler:
     @patch("twyn.file_handler.file_handler.FileHandler.write")
     @patch("twyn.config.config_handler.ConfigHandler._read_toml")
-    def test_allowlist_add(self, mock_toml, mock_write_toml):
+    def test_allowlist_add(self, mock_toml: Mock, mock_write_toml: Mock) -> None:
         mock_toml.return_value = TOMLDocument()
 
         config = ConfigHandler(FileHandler("some-file"))
@@ -123,7 +155,7 @@ def test_allowlist_add(self, mock_toml, mock_write_toml):
 
     @patch("twyn.config.config_handler.ConfigHandler._write_toml")
     @patch("twyn.config.config_handler.ConfigHandler._read_toml")
-    def test_allowlist_add_duplicate_error(self, mock_toml, mock_write_toml):
+    def test_allowlist_add_duplicate_error(self, mock_toml: Mock, mock_write_toml: Mock) -> None:
         mock_toml.return_value = parse(dumps({"tool": {"twyn": {"allowlist": ["mypackage"]}}}))
 
         config = ConfigHandler(FileHandler("some-file"))
@@ -137,7 +169,7 @@ def test_allowlist_add_duplicate_error(self, mock_toml, mock_write_toml):
 
     @patch("twyn.config.config_handler.ConfigHandler._write_toml")
     @patch("twyn.config.config_handler.ConfigHandler._read_toml")
-    def test_allowlist_remove_completely(self, mock_toml, mock_write_toml):
+    def test_allowlist_remove_completely(self, mock_toml: Mock, mock_write_toml: Mock) -> None:
         mock_toml.return_value = parse(dumps({"tool": {"twyn": {"allowlist": ["mypackage"]}}}))
 
         config = ConfigHandler(FileHandler("some-file"))
@@ -147,7 +179,7 @@ def test_allowlist_remove_completely(self, mock_toml, mock_write_toml):
 
     @patch("twyn.config.config_handler.ConfigHandler._write_toml")
     @patch("twyn.config.config_handler.ConfigHandler._read_toml")
-    def test_allowlist_remove(self, mock_toml, mock_write_toml):
+    def test_allowlist_remove(self, mock_toml: Mock, mock_write_toml: Mock) -> None:
         mock_toml.return_value = parse(dumps({"tool": {"twyn": {"allowlist": ["mypackage", "another-package"]}}}))
 
         config = ConfigHandler(FileHandler("some-file"))
@@ -157,7 +189,7 @@ def test_allowlist_remove(self, mock_toml, mock_write_toml):
 
     @patch("twyn.config.config_handler.ConfigHandler._write_toml")
     @patch("twyn.config.config_handler.ConfigHandler._read_toml")
-    def test_allowlist_remove_non_existent_package_error(self, mock_toml, mock_write_toml):
+    def test_allowlist_remove_non_existent_package_error(self, mock_toml: Mock, mock_write_toml: Mock) -> None:
         mock_toml.return_value = parse(dumps({"tool": {"twyn": {"allowlist": ["mypackage"]}}}))
 
         config = ConfigHandler(FileHandler("some-file"))
@@ -170,7 +202,7 @@ def test_allowlist_remove_non_existent_package_error(self, mock_toml, mock_write
         assert not mock_write_toml.called
 
     @pytest.mark.parametrize("valid_selector", ["first-letter", "nearby-letter", "all"])
-    def test_valid_selector_methods_accepted(self, valid_selector: str, tmp_path: Path):
+    def test_valid_selector_methods_accepted(self, valid_selector: str, tmp_path: Path) -> None:
         """Test that all valid selector methods are accepted."""
         pyproject_toml = tmp_path / "pyproject.toml"
         pyproject_toml.write_text("")
@@ -180,7 +212,7 @@ def test_valid_selector_methods_accepted(self, valid_selector: str, tmp_path: Pa
         resolved_config = config.resolve_config(selector_method=valid_selector)
         assert resolved_config.selector_method == valid_selector
 
-    def test_invalid_selector_method_rejected(self, tmp_path: Path):
+    def test_invalid_selector_method_rejected(self, tmp_path: Path) -> None:
         """Test that invalid selector methods are rejected with appropriate error."""
         pyproject_toml = tmp_path / "pyproject.toml"
         pyproject_toml.write_text("")
@@ -193,7 +225,7 @@ def test_invalid_selector_method_rejected(self, tmp_path: Path):
         assert "Invalid selector_method 'random-selector'" in error_message
         assert "Must be one of: all, first-letter, nearby-letter" in error_message
 
-    def test_invalid_selector_method_from_config_file(self, tmp_path: Path):
+    def test_invalid_selector_method_from_config_file(self, tmp_path: Path) -> None:
         """Test that invalid selector method from config file is rejected."""
         # Create a config file with invalid selector method
         pyproject_toml = tmp_path / "pyproject.toml"

tests/core/test_config_handler.py tests/config/test_config_handler.pytests/core/test_config_handler.py renamed to tests/config/test_config_handler.py

@@ -7,10 +7,10 @@
 
 
 @contextmanager
-def create_tmp_file(path: Path, data: str) -> Iterator[str]:
+def create_tmp_file(path: Path, data: str) -> Iterator[Path]:
     path.parent.mkdir(parents=True, exist_ok=True)
     path.write_text(data)
-    yield str(path)
+    yield path
 
 
 @contextmanager
@@ -28,7 +28,7 @@ def patch_pypi_packages_download(packages: Iterable[str]) -> Iterator[mock.Mock]
 
 
 @pytest.fixture
-def requirements_txt_file(tmp_path: Path) -> Iterator[str]:
+def requirements_txt_file(tmp_path: Path) -> Iterator[Path]:
     requirements_txt_file = tmp_path / "requirements.txt"
 
     data = """
@@ -41,7 +41,7 @@ def requirements_txt_file(tmp_path: Path) -> Iterator[str]:
 
 
 @pytest.fixture
-def poetry_lock_file_lt_1_5(tmp_path: Path) -> Iterator[str]:
+def poetry_lock_file_lt_1_5(tmp_path: Path) -> Iterator[Path]:
     """Poetry lock version < 1.5."""
     poetry_lock_file = tmp_path / "poetry.lock"
     data = """
@@ -88,7 +88,7 @@ def poetry_lock_file_lt_1_5(tmp_path: Path) -> Iterator[str]:
 
 
 @pytest.fixture
-def poetry_lock_file_ge_1_5(tmp_path: Path) -> Iterator[str]:
+def poetry_lock_file_ge_1_5(tmp_path: Path) -> Iterator[Path]:
     """Poetry lock version >= 1.5."""
     poetry_lock_file = tmp_path / "poetry.lock"
     data = """
@@ -132,7 +132,7 @@ def poetry_lock_file_ge_1_5(tmp_path: Path) -> Iterator[str]:
 
 
 @pytest.fixture
-def uv_lock_file(tmp_path: Path) -> Iterator[str]:
+def uv_lock_file(tmp_path: Path) -> Iterator[Path]:
     """Uv lock file."""
     uv_lock_file = tmp_path / "uv.lock"
     data = """
@@ -177,7 +177,7 @@ def uv_lock_file(tmp_path: Path) -> Iterator[str]:
 
 
 @pytest.fixture
-def pyproject_toml_file(tmp_path: Path) -> Iterator[str]:
+def pyproject_toml_file(tmp_path: Path) -> Iterator[Path]:
     pyproject_toml = tmp_path / "pyproject.toml"
     data = """
     [tool.poetry.dependencies]