feat(config): detect invalid pyproject.toml options

deptry/config.py

@@ -3,6 +3,7 @@
 import logging
 from typing import TYPE_CHECKING, Any
 
+from deptry.exceptions import InvalidPyprojectTOMLOptionsError
 from deptry.utils import load_pyproject_toml
 
 if TYPE_CHECKING:
@@ -11,6 +12,13 @@
     import click
 
 
+def _get_invalid_pyproject_toml_keys(ctx: click.Context, deptry_toml_config_keys: set[str]) -> list[str]:
+    """Returns the list of options set in `pyproject.toml` that do not exist as CLI parameters."""
+    existing_cli_params = {param.name for param in ctx.command.params}
+
+    return sorted(deptry_toml_config_keys.difference(existing_cli_params))
+
+
 def read_configuration_from_pyproject_toml(ctx: click.Context, _param: click.Parameter, value: Path) -> Path | None:
     """
     Callback that, given a click context, overrides the default values with configuration options set in a
@@ -28,11 +36,15 @@ def read_configuration_from_pyproject_toml(ctx: click.Context, _param: click.Par
         return value
 
     try:
-        deptry_toml_config = pyproject_data["tool"]["deptry"]
+        deptry_toml_config: dict[str, Any] = pyproject_data["tool"]["deptry"]
     except KeyError:
         logging.debug("No configuration for deptry was found in pyproject.toml.")
         return value
 
+    invalid_pyproject_toml_keys = _get_invalid_pyproject_toml_keys(ctx, set(deptry_toml_config))
+    if invalid_pyproject_toml_keys:
+        raise InvalidPyprojectTOMLOptionsError(invalid_pyproject_toml_keys)
+
     click_default_map: dict[str, Any] = {}
 
     if ctx.default_map:

deptry/exceptions.py

@@ -2,6 +2,8 @@
 
 from typing import TYPE_CHECKING
 
+from click import UsageError
+
 if TYPE_CHECKING:
     from pathlib import Path
 
@@ -29,3 +31,10 @@ def __init__(self, version: tuple[int, int]) -> None:
         super().__init__(
             f"Python version {version[0]}.{version[1]} is not supported. Only versions >= 3.8 are supported."
         )
+
+
+class InvalidPyprojectTOMLOptionsError(UsageError):
+    def __init__(self, invalid_options: list[str]) -> None:
+        super().__init__(
+            f"'[tool.deptry]' section in 'pyproject.toml' contains invalid configuration options: {invalid_options}."
+        )