Allow dash-separated module name in pyproject.toml (#4566)

setuptools/config/_validate_pyproject/error_reporting.py

@@ -6,7 +6,7 @@
 import typing
 from contextlib import contextmanager
 from textwrap import indent, wrap
-from typing import Any, Dict, Generator, Iterator, List, Optional, Sequence, Union, cast
+from typing import Any, Dict, Generator, Iterator, List, Optional, Sequence, Union
 
 from .fastjsonschema_exceptions import JsonSchemaValueException
 
@@ -316,9 +316,7 @@ def _label(self, path: Sequence[str]) -> str:
     def _value(self, value: Any, path: Sequence[str]) -> str:
         if path[-1] == "type" and not self._is_property(path):
             type_ = self._jargon(value)
-            return (
-                f"[{', '.join(type_)}]" if isinstance(value, list) else cast(str, type_)
-            )
+            return f"[{', '.join(type_)}]" if isinstance(type_, list) else type_
         return repr(value)
 
     def _inline_attrs(self, schema: dict, path: Sequence[str]) -> Iterator[str]:

setuptools/config/_validate_pyproject/formats.py

@@ -83,7 +83,9 @@ def pep508_identifier(name: str) -> bool:
         from packaging import requirements as _req
     except ImportError:  # pragma: no cover
         # let's try setuptools vendored version
-        from setuptools._vendor.packaging import requirements as _req  # type: ignore
+        from setuptools._vendor.packaging import (  # type: ignore[no-redef]
+            requirements as _req,
+        )
 
     def pep508(value: str) -> bool:
         """See :ref:`PyPA's dependency specifiers <pypa:dependency-specifiers>`
@@ -289,6 +291,25 @@ def python_module_name(value: str) -> bool:
     return python_qualified_identifier(value)
 
 
+def python_module_name_relaxed(value: str) -> bool:
+    """Similar to :obj:`python_module_name`, but relaxed to also accept
+    dash characters (``-``) and cover special cases like ``pip-run``.
+
+    It is recommended, however, that beginners avoid dash characters,
+    as they require advanced knowledge about Python internals.
+
+    The following are disallowed:
+
+    * names starting/ending in dashes,
+    * names ending in ``-stubs`` (potentially collide with :obj:`pep561_stub_name`).
+    """
+    if value.startswith("-") or value.endswith("-"):
+        return False
+    if value.endswith("-stubs"):
+        return False  # Avoid collision with PEP 561
+    return python_module_name(value.replace("-", "_"))
+
+
 def python_entrypoint_group(value: str) -> bool:
     """See ``Data model > group`` in the :ref:`PyPA's entry-points specification
     <pypa:entry-points>`.

setuptools/config/setuptools.schema.json

@@ -148,14 +148,14 @@
     },
     "namespace-packages": {
       "type": "array",
-      "items": {"type": "string", "format": "python-module-name"},
+      "items": {"type": "string", "format": "python-module-name-relaxed"},
       "$comment": "https://setuptools.pypa.io/en/latest/userguide/package_discovery.html",
       "description": "**DEPRECATED**: use implicit namespaces instead (:pep:`420`)."
     },
     "py-modules": {
       "description": "Modules that setuptools will manipulate",
       "type": "array",
-      "items": {"type": "string", "format": "python-module-name"},
+      "items": {"type": "string", "format": "python-module-name-relaxed"},
       "$comment": "TODO: clarify the relationship with ``packages``"
     },
     "data-files": {
@@ -250,7 +250,7 @@
       "description": "Valid package name (importable or :pep:`561`).",
       "type": "string",
       "anyOf": [
-        {"type": "string", "format": "python-module-name"},
+        {"type": "string", "format": "python-module-name-relaxed"},
         {"type": "string", "format": "pep561-stub-name"}
       ]
     },

setuptools/tests/config/test_apply_pyprojecttoml.py

@@ -297,6 +297,33 @@ def test_default_patterns(self, tmp_path):
         assert set(dist.metadata.license_files) == {*license_files, "LICENSE.txt"}
 
 
+class TestPyModules:
+    # https://github.com/pypa/setuptools/issues/4316
+
+    def dist(self, name):
+        toml_config = f"""
+        [project]
+        name = "test"
+        version = "42.0"
+        [tool.setuptools]
+        py-modules = [{name!r}]
+        """
+        pyproject = Path("pyproject.toml")
+        pyproject.write_text(cleandoc(toml_config), encoding="utf-8")
+        return pyprojecttoml.apply_configuration(Distribution({}), pyproject)
+
+    @pytest.mark.parametrize("module", ["pip-run", "abc-d.λ-xyz-e"])
+    def test_valid_module_name(self, tmp_path, monkeypatch, module):
+        monkeypatch.chdir(tmp_path)
+        assert module in self.dist(module).py_modules
+
+    @pytest.mark.parametrize("module", ["pip run", "-pip-run", "pip-run-stubs"])
+    def test_invalid_module_name(self, tmp_path, monkeypatch, module):
+        monkeypatch.chdir(tmp_path)
+        with pytest.raises(ValueError, match="py-modules"):
+            self.dist(module).py_modules
+
+
 class TestDeprecatedFields:
     def test_namespace_packages(self, tmp_path):
         pyproject = tmp_path / "pyproject.toml"

tox.ini

@@ -84,7 +84,7 @@ commands =
 [testenv:generate-validation-code]
 skip_install = True
 deps =
-	validate-pyproject[all]==0.18
+	validate-pyproject[all]==0.19
 commands =
 	python -m tools.generate_validation_code