venv/lib/python3.10/site-packages/setuptools/config/_apply_pyprojecttoml.py - third_party/shuttle/sky130/mpw-008/slot-030 - Git at Google

 """Translation layer between pyproject config and setuptools distribution and
 metadata objects.

 The distribution and metadata objects are modeled after (an old version of)
 core metadata, therefore configs in the format specified for ``pyproject.toml``
 need to be processed before being applied.

 **PRIVATE MODULE**: API reserved for setuptools internal usage only.
 """
 import logging
 import os
 import warnings
 from collections.abc import Mapping
 from email.headerregistry import Address
 from functools import partial, reduce
 from itertools import chain
 from types import MappingProxyType
 from typing import (TYPE_CHECKING, Any, Callable, Dict, List, Optional, Set, Tuple,
                     Type, Union)

 from setuptools._deprecation_warning import SetuptoolsDeprecationWarning

 if TYPE_CHECKING:
     from setuptools._importlib import metadata  # noqa
     from setuptools.dist import Distribution  # noqa

 EMPTY: Mapping = MappingProxyType({})  # Immutable dict-like
 _Path = Union[os.PathLike, str]
 _DictOrStr = Union[dict, str]
 _CorrespFn = Callable[["Distribution", Any, _Path], None]
 _Correspondence = Union[str, _CorrespFn]

 _logger = logging.getLogger(__name__)


 def apply(dist: "Distribution", config: dict, filename: _Path) -> "Distribution":
     """Apply configuration dict read with :func:`read_configuration`"""

     if not config:
         return dist  # short-circuit unrelated pyproject.toml file

     root_dir = os.path.dirname(filename) or "."

     _apply_project_table(dist, config, root_dir)
     _apply_tool_table(dist, config, filename)

     current_directory = os.getcwd()
     os.chdir(root_dir)
     try:
         dist._finalize_requires()
         dist._finalize_license_files()
     finally:
         os.chdir(current_directory)

     return dist


 def _apply_project_table(dist: "Distribution", config: dict, root_dir: _Path):
     project_table = config.get("project", {}).copy()
     if not project_table:
         return  # short-circuit

     _handle_missing_dynamic(dist, project_table)
     _unify_entry_points(project_table)

     for field, value in project_table.items():
         norm_key = json_compatible_key(field)
         corresp = PYPROJECT_CORRESPONDENCE.get(norm_key, norm_key)
         if callable(corresp):
             corresp(dist, value, root_dir)
         else:
             _set_config(dist, corresp, value)


 def _apply_tool_table(dist: "Distribution", config: dict, filename: _Path):
     tool_table = config.get("tool", {}).get("setuptools", {})
     if not tool_table:
         return  # short-circuit

     for field, value in tool_table.items():
         norm_key = json_compatible_key(field)

         if norm_key in TOOL_TABLE_DEPRECATIONS:
             suggestion = TOOL_TABLE_DEPRECATIONS[norm_key]
             msg = f"The parameter `{norm_key}` is deprecated, {suggestion}"
             warnings.warn(msg, SetuptoolsDeprecationWarning)

         norm_key = TOOL_TABLE_RENAMES.get(norm_key, norm_key)
         _set_config(dist, norm_key, value)

     _copy_command_options(config, dist, filename)


 def _handle_missing_dynamic(dist: "Distribution", project_table: dict):
     """Be temporarily forgiving with ``dynamic`` fields not listed in ``dynamic``"""
     # TODO: Set fields back to `None` once the feature stabilizes
     dynamic = set(project_table.get("dynamic", []))
     for field, getter in _PREVIOUSLY_DEFINED.items():
         if not (field in project_table or field in dynamic):
             value = getter(dist)
             if value:
                 msg = _WouldIgnoreField.message(field, value)
                 warnings.warn(msg, _WouldIgnoreField)


 def json_compatible_key(key: str) -> str:
     """As defined in :pep:`566#json-compatible-metadata`"""
     return key.lower().replace("-", "_")


 def _set_config(dist: "Distribution", field: str, value: Any):
     setter = getattr(dist.metadata, f"set_{field}", None)
     if setter:
         setter(value)
     elif hasattr(dist.metadata, field) or field in SETUPTOOLS_PATCHES:
         setattr(dist.metadata, field, value)
     else:
         setattr(dist, field, value)


 _CONTENT_TYPES = {
     ".md": "text/markdown",
     ".rst": "text/x-rst",
     ".txt": "text/plain",
 }


 def _guess_content_type(file: str) -> Optional[str]:
     _, ext = os.path.splitext(file.lower())
     if not ext:
         return None

     if ext in _CONTENT_TYPES:
         return _CONTENT_TYPES[ext]

     valid = ", ".join(f"{k} ({v})" for k, v in _CONTENT_TYPES.items())
     msg = f"only the following file extensions are recognized: {valid}."
     raise ValueError(f"Undefined content type for {file}, {msg}")


 def _long_description(dist: "Distribution", val: _DictOrStr, root_dir: _Path):
     from setuptools.config import expand

     if isinstance(val, str):
         text = expand.read_files(val, root_dir)
         ctype = _guess_content_type(val)
     else:
         text = val.get("text") or expand.read_files(val.get("file", []), root_dir)
         ctype = val["content-type"]

     _set_config(dist, "long_description", text)
     if ctype:
         _set_config(dist, "long_description_content_type", ctype)


 def _license(dist: "Distribution", val: dict, root_dir: _Path):
     from setuptools.config import expand

     if "file" in val:
         _set_config(dist, "license", expand.read_files([val["file"]], root_dir))
     else:
         _set_config(dist, "license", val["text"])


 def _people(dist: "Distribution", val: List[dict], _root_dir: _Path, kind: str):
     field = []
     email_field = []
     for person in val:
         if "name" not in person:
             email_field.append(person["email"])
         elif "email" not in person:
             field.append(person["name"])
         else:
             addr = Address(display_name=person["name"], addr_spec=person["email"])
             email_field.append(str(addr))

     if field:
         _set_config(dist, kind, ", ".join(field))
     if email_field:
         _set_config(dist, f"{kind}_email", ", ".join(email_field))


 def _project_urls(dist: "Distribution", val: dict, _root_dir):
     _set_config(dist, "project_urls", val)


 def _python_requires(dist: "Distribution", val: dict, _root_dir):
     from setuptools.extern.packaging.specifiers import SpecifierSet

     _set_config(dist, "python_requires", SpecifierSet(val))


 def _dependencies(dist: "Distribution", val: list, _root_dir):
     if getattr(dist, "install_requires", []):
         msg = "`install_requires` overwritten in `pyproject.toml` (dependencies)"
         warnings.warn(msg)
     _set_config(dist, "install_requires", val)


 def _optional_dependencies(dist: "Distribution", val: dict, _root_dir):
     existing = getattr(dist, "extras_require", {})
     _set_config(dist, "extras_require", {**existing, **val})


 def _unify_entry_points(project_table: dict):
     project = project_table
     entry_points = project.pop("entry-points", project.pop("entry_points", {}))
     renaming = {"scripts": "console_scripts", "gui_scripts": "gui_scripts"}
     for key, value in list(project.items()):  # eager to allow modifications
         norm_key = json_compatible_key(key)
         if norm_key in renaming and value:
             entry_points[renaming[norm_key]] = project.pop(key)

     if entry_points:
         project["entry-points"] = {
             name: [f"{k} = {v}" for k, v in group.items()]
             for name, group in entry_points.items()
         }


 def _copy_command_options(pyproject: dict, dist: "Distribution", filename: _Path):
     tool_table = pyproject.get("tool", {})
     cmdclass = tool_table.get("setuptools", {}).get("cmdclass", {})
     valid_options = _valid_command_options(cmdclass)

     cmd_opts = dist.command_options
     for cmd, config in pyproject.get("tool", {}).get("distutils", {}).items():
         cmd = json_compatible_key(cmd)
         valid = valid_options.get(cmd, set())
         cmd_opts.setdefault(cmd, {})
         for key, value in config.items():
             key = json_compatible_key(key)
             cmd_opts[cmd][key] = (str(filename), value)
             if key not in valid:
                 # To avoid removing options that are specified dynamically we
                 # just log a warn...
                 _logger.warning(f"Command option {cmd}.{key} is not defined")


 def _valid_command_options(cmdclass: Mapping = EMPTY) -> Dict[str, Set[str]]:
     from .._importlib import metadata
     from setuptools.dist import Distribution

     valid_options = {"global": _normalise_cmd_options(Distribution.global_options)}

     unloaded_entry_points = metadata.entry_points(group='distutils.commands')
     loaded_entry_points = (_load_ep(ep) for ep in unloaded_entry_points)
     entry_points = (ep for ep in loaded_entry_points if ep)
     for cmd, cmd_class in chain(entry_points, cmdclass.items()):
         opts = valid_options.get(cmd, set())
         opts = opts | _normalise_cmd_options(getattr(cmd_class, "user_options", []))
         valid_options[cmd] = opts

     return valid_options


 def _load_ep(ep: "metadata.EntryPoint") -> Optional[Tuple[str, Type]]:
     # Ignore all the errors
     try:
         return (ep.name, ep.load())
     except Exception as ex:
         msg = f"{ex.__class__.__name__} while trying to load entry-point {ep.name}"
         _logger.warning(f"{msg}: {ex}")
         return None


 def _normalise_cmd_option_key(name: str) -> str:
     return json_compatible_key(name).strip("_=")


 def _normalise_cmd_options(desc: List[Tuple[str, Optional[str], str]]) -> Set[str]:
     return {_normalise_cmd_option_key(fancy_option[0]) for fancy_option in desc}


 def _attrgetter(attr):
     """
     Similar to ``operator.attrgetter`` but returns None if ``attr`` is not found
     >>> from types import SimpleNamespace
     >>> obj = SimpleNamespace(a=42, b=SimpleNamespace(c=13))
     >>> _attrgetter("a")(obj)
     42
     >>> _attrgetter("b.c")(obj)
     13
     >>> _attrgetter("d")(obj) is None
     True
     """
     return partial(reduce, lambda acc, x: getattr(acc, x, None), attr.split("."))


 def _some_attrgetter(*items):
     """
     Return the first "truth-y" attribute or None
     >>> from types import SimpleNamespace
     >>> obj = SimpleNamespace(a=42, b=SimpleNamespace(c=13))
     >>> _some_attrgetter("d", "a", "b.c")(obj)
     42
     >>> _some_attrgetter("d", "e", "b.c", "a")(obj)
     13
     >>> _some_attrgetter("d", "e", "f")(obj) is None
     True
     """
     def _acessor(obj):
         values = (_attrgetter(i)(obj) for i in items)
         return next((i for i in values if i is not None), None)
     return _acessor


 PYPROJECT_CORRESPONDENCE: Dict[str, _Correspondence] = {
     "readme": _long_description,
     "license": _license,
     "authors": partial(_people, kind="author"),
     "maintainers": partial(_people, kind="maintainer"),
     "urls": _project_urls,
     "dependencies": _dependencies,
     "optional_dependencies": _optional_dependencies,
     "requires_python": _python_requires,
 }

 TOOL_TABLE_RENAMES = {"script_files": "scripts"}
 TOOL_TABLE_DEPRECATIONS = {
     "namespace_packages": "consider using implicit namespaces instead (PEP 420)."
 }

 SETUPTOOLS_PATCHES = {"long_description_content_type", "project_urls",
                       "provides_extras", "license_file", "license_files"}

 _PREVIOUSLY_DEFINED = {
     "name": _attrgetter("metadata.name"),
     "version": _attrgetter("metadata.version"),
     "description": _attrgetter("metadata.description"),
     "readme": _attrgetter("metadata.long_description"),
     "requires-python": _some_attrgetter("python_requires", "metadata.python_requires"),
     "license": _attrgetter("metadata.license"),
     "authors": _some_attrgetter("metadata.author", "metadata.author_email"),
     "maintainers": _some_attrgetter("metadata.maintainer", "metadata.maintainer_email"),
     "keywords": _attrgetter("metadata.keywords"),
     "classifiers": _attrgetter("metadata.classifiers"),
     "urls": _attrgetter("metadata.project_urls"),
     "entry-points": _attrgetter("entry_points"),
     "dependencies": _some_attrgetter("_orig_install_requires", "install_requires"),
     "optional-dependencies": _some_attrgetter("_orig_extras_require", "extras_require"),
 }


 class _WouldIgnoreField(UserWarning):
     """Inform users that ``pyproject.toml`` would overwrite previous metadata."""

     MESSAGE = """\
     {field!r} defined outside of `pyproject.toml` would be ignored.
     !!\n\n
     ##########################################################################
     # configuration would be ignored/result in error due to `pyproject.toml` #
     ##########################################################################

     The following seems to be defined outside of `pyproject.toml`:

     `{field} = {value!r}`

     According to the spec (see the link below), however, setuptools CANNOT
     consider this value unless {field!r} is listed as `dynamic`.

     https://packaging.python.org/en/latest/specifications/declaring-project-metadata/

     For the time being, `setuptools` will still consider the given value (as a
     **transitional** measure), but please note that future releases of setuptools will
     follow strictly the standard.

     To prevent this warning, you can list {field!r} under `dynamic` or alternatively
     remove the `[project]` table from your file and rely entirely on other means of
     configuration.
     \n\n!!
     """

     @classmethod
     def message(cls, field, value):
         from inspect import cleandoc
         return cleandoc(cls.MESSAGE.format(field=field, value=value))
	"""Translation layer between pyproject config and setuptools distribution and
	metadata objects.

	The distribution and metadata objects are modeled after (an old version of)
	core metadata, therefore configs in the format specified for ``pyproject.toml``
	need to be processed before being applied.

	PRIVATE MODULE: API reserved for setuptools internal usage only.
	"""
	import logging
	import os
	import warnings
	from collections.abc import Mapping
	from email.headerregistry import Address
	from functools import partial, reduce
	from itertools import chain
	from types import MappingProxyType
	from typing import (TYPE_CHECKING, Any, Callable, Dict, List, Optional, Set, Tuple,
	Type, Union)

	from setuptools._deprecation_warning import SetuptoolsDeprecationWarning

	if TYPE_CHECKING:
	from setuptools._importlib import metadata # noqa
	from setuptools.dist import Distribution # noqa

	EMPTY: Mapping = MappingProxyType({}) # Immutable dict-like
	_Path = Union[os.PathLike, str]
	_DictOrStr = Union[dict, str]
	_CorrespFn = Callable[["Distribution", Any, _Path], None]
	_Correspondence = Union[str, _CorrespFn]

	_logger = logging.getLogger(__name__)


	def apply(dist: "Distribution", config: dict, filename: _Path) -> "Distribution":
	"""Apply configuration dict read with :func:`read_configuration`"""

	if not config:
	return dist # short-circuit unrelated pyproject.toml file

	root_dir = os.path.dirname(filename) or "."

	_apply_project_table(dist, config, root_dir)
	_apply_tool_table(dist, config, filename)

	current_directory = os.getcwd()
	os.chdir(root_dir)
	try:
	dist._finalize_requires()
	dist._finalize_license_files()
	finally:
	os.chdir(current_directory)

	return dist


	def _apply_project_table(dist: "Distribution", config: dict, root_dir: _Path):
	project_table = config.get("project", {}).copy()
	if not project_table:
	return # short-circuit

	_handle_missing_dynamic(dist, project_table)
	_unify_entry_points(project_table)

	for field, value in project_table.items():
	norm_key = json_compatible_key(field)
	corresp = PYPROJECT_CORRESPONDENCE.get(norm_key, norm_key)
	if callable(corresp):
	corresp(dist, value, root_dir)
	else:
	_set_config(dist, corresp, value)


	def _apply_tool_table(dist: "Distribution", config: dict, filename: _Path):
	tool_table = config.get("tool", {}).get("setuptools", {})
	if not tool_table:
	return # short-circuit

	for field, value in tool_table.items():
	norm_key = json_compatible_key(field)

	if norm_key in TOOL_TABLE_DEPRECATIONS:
	suggestion = TOOL_TABLE_DEPRECATIONS[norm_key]
	msg = f"The parameter `{norm_key}` is deprecated, {suggestion}"
	warnings.warn(msg, SetuptoolsDeprecationWarning)

	norm_key = TOOL_TABLE_RENAMES.get(norm_key, norm_key)
	_set_config(dist, norm_key, value)

	_copy_command_options(config, dist, filename)


	def _handle_missing_dynamic(dist: "Distribution", project_table: dict):
	"""Be temporarily forgiving with ``dynamic`` fields not listed in ``dynamic``"""
	# TODO: Set fields back to `None` once the feature stabilizes
	dynamic = set(project_table.get("dynamic", []))
	for field, getter in _PREVIOUSLY_DEFINED.items():
	if not (field in project_table or field in dynamic):
	value = getter(dist)
	if value:
	msg = _WouldIgnoreField.message(field, value)
	warnings.warn(msg, _WouldIgnoreField)


	def json_compatible_key(key: str) -> str:
	"""As defined in :pep:`566#json-compatible-metadata`"""
	return key.lower().replace("-", "_")


	def _set_config(dist: "Distribution", field: str, value: Any):
	setter = getattr(dist.metadata, f"set_{field}", None)
	if setter:
	setter(value)
	elif hasattr(dist.metadata, field) or field in SETUPTOOLS_PATCHES:
	setattr(dist.metadata, field, value)
	else:
	setattr(dist, field, value)


	_CONTENT_TYPES = {
	".md": "text/markdown",
	".rst": "text/x-rst",
	".txt": "text/plain",
	}


	def _guess_content_type(file: str) -> Optional[str]:
	_, ext = os.path.splitext(file.lower())
	if not ext:
	return None

	if ext in _CONTENT_TYPES:
	return _CONTENT_TYPES[ext]

	valid = ", ".join(f"{k} ({v})" for k, v in _CONTENT_TYPES.items())
	msg = f"only the following file extensions are recognized: {valid}."
	raise ValueError(f"Undefined content type for {file}, {msg}")


	def _long_description(dist: "Distribution", val: _DictOrStr, root_dir: _Path):
	from setuptools.config import expand

	if isinstance(val, str):
	text = expand.read_files(val, root_dir)
	ctype = _guess_content_type(val)
	else:
	text = val.get("text") or expand.read_files(val.get("file", []), root_dir)
	ctype = val["content-type"]

	_set_config(dist, "long_description", text)
	if ctype:
	_set_config(dist, "long_description_content_type", ctype)


	def _license(dist: "Distribution", val: dict, root_dir: _Path):
	from setuptools.config import expand

	if "file" in val:
	_set_config(dist, "license", expand.read_files([val["file"]], root_dir))
	else:
	_set_config(dist, "license", val["text"])


	def _people(dist: "Distribution", val: List[dict], _root_dir: _Path, kind: str):
	field = []
	email_field = []
	for person in val:
	if "name" not in person:
	email_field.append(person["email"])
	elif "email" not in person:
	field.append(person["name"])
	else:
	addr = Address(display_name=person["name"], addr_spec=person["email"])
	email_field.append(str(addr))

	if field:
	_set_config(dist, kind, ", ".join(field))
	if email_field:
	_set_config(dist, f"{kind}_email", ", ".join(email_field))


	def _project_urls(dist: "Distribution", val: dict, _root_dir):
	_set_config(dist, "project_urls", val)


	def _python_requires(dist: "Distribution", val: dict, _root_dir):
	from setuptools.extern.packaging.specifiers import SpecifierSet

	_set_config(dist, "python_requires", SpecifierSet(val))


	def _dependencies(dist: "Distribution", val: list, _root_dir):
	if getattr(dist, "install_requires", []):
	msg = "`install_requires` overwritten in `pyproject.toml` (dependencies)"
	warnings.warn(msg)
	_set_config(dist, "install_requires", val)


	def _optional_dependencies(dist: "Distribution", val: dict, _root_dir):
	existing = getattr(dist, "extras_require", {})
	_set_config(dist, "extras_require", {existing, val})


	def _unify_entry_points(project_table: dict):
	project = project_table
	entry_points = project.pop("entry-points", project.pop("entry_points", {}))
	renaming = {"scripts": "console_scripts", "gui_scripts": "gui_scripts"}
	for key, value in list(project.items()): # eager to allow modifications
	norm_key = json_compatible_key(key)
	if norm_key in renaming and value:
	entry_points[renaming[norm_key]] = project.pop(key)

	if entry_points:
	project["entry-points"] = {
	name: [f"{k} = {v}" for k, v in group.items()]
	for name, group in entry_points.items()
	}


	def _copy_command_options(pyproject: dict, dist: "Distribution", filename: _Path):
	tool_table = pyproject.get("tool", {})
	cmdclass = tool_table.get("setuptools", {}).get("cmdclass", {})
	valid_options = _valid_command_options(cmdclass)

	cmd_opts = dist.command_options
	for cmd, config in pyproject.get("tool", {}).get("distutils", {}).items():
	cmd = json_compatible_key(cmd)
	valid = valid_options.get(cmd, set())
	cmd_opts.setdefault(cmd, {})
	for key, value in config.items():
	key = json_compatible_key(key)
	cmd_opts[cmd][key] = (str(filename), value)
	if key not in valid:
	# To avoid removing options that are specified dynamically we
	# just log a warn...
	_logger.warning(f"Command option {cmd}.{key} is not defined")


	def _valid_command_options(cmdclass: Mapping = EMPTY) -> Dict[str, Set[str]]:
	from .._importlib import metadata
	from setuptools.dist import Distribution

	valid_options = {"global": _normalise_cmd_options(Distribution.global_options)}

	unloaded_entry_points = metadata.entry_points(group='distutils.commands')
	loaded_entry_points = (_load_ep(ep) for ep in unloaded_entry_points)
	entry_points = (ep for ep in loaded_entry_points if ep)
	for cmd, cmd_class in chain(entry_points, cmdclass.items()):
	opts = valid_options.get(cmd, set())
	opts = opts \| _normalise_cmd_options(getattr(cmd_class, "user_options", []))
	valid_options[cmd] = opts

	return valid_options


	def _load_ep(ep: "metadata.EntryPoint") -> Optional[Tuple[str, Type]]:
	# Ignore all the errors
	try:
	return (ep.name, ep.load())
	except Exception as ex:
	msg = f"{ex.__class__.__name__} while trying to load entry-point {ep.name}"
	_logger.warning(f"{msg}: {ex}")
	return None


	def _normalise_cmd_option_key(name: str) -> str:
	return json_compatible_key(name).strip("_=")


	def _normalise_cmd_options(desc: List[Tuple[str, Optional[str], str]]) -> Set[str]:
	return {_normalise_cmd_option_key(fancy_option[0]) for fancy_option in desc}


	def _attrgetter(attr):
	"""
	Similar to ``operator.attrgetter`` but returns None if ``attr`` is not found
	>>> from types import SimpleNamespace
	>>> obj = SimpleNamespace(a=42, b=SimpleNamespace(c=13))
	>>> _attrgetter("a")(obj)
	42
	>>> _attrgetter("b.c")(obj)
	13
	>>> _attrgetter("d")(obj) is None
	True
	"""
	return partial(reduce, lambda acc, x: getattr(acc, x, None), attr.split("."))


	def _some_attrgetter(*items):
	"""
	Return the first "truth-y" attribute or None
	>>> from types import SimpleNamespace
	>>> obj = SimpleNamespace(a=42, b=SimpleNamespace(c=13))
	>>> _some_attrgetter("d", "a", "b.c")(obj)
	42
	>>> _some_attrgetter("d", "e", "b.c", "a")(obj)
	13
	>>> _some_attrgetter("d", "e", "f")(obj) is None
	True
	"""
	def _acessor(obj):
	values = (_attrgetter(i)(obj) for i in items)
	return next((i for i in values if i is not None), None)
	return _acessor


	PYPROJECT_CORRESPONDENCE: Dict[str, _Correspondence] = {
	"readme": _long_description,
	"license": _license,
	"authors": partial(_people, kind="author"),
	"maintainers": partial(_people, kind="maintainer"),
	"urls": _project_urls,
	"dependencies": _dependencies,
	"optional_dependencies": _optional_dependencies,
	"requires_python": _python_requires,
	}

	TOOL_TABLE_RENAMES = {"script_files": "scripts"}
	TOOL_TABLE_DEPRECATIONS = {
	"namespace_packages": "consider using implicit namespaces instead (PEP 420)."
	}

	SETUPTOOLS_PATCHES = {"long_description_content_type", "project_urls",
	"provides_extras", "license_file", "license_files"}

	_PREVIOUSLY_DEFINED = {
	"name": _attrgetter("metadata.name"),
	"version": _attrgetter("metadata.version"),
	"description": _attrgetter("metadata.description"),
	"readme": _attrgetter("metadata.long_description"),
	"requires-python": _some_attrgetter("python_requires", "metadata.python_requires"),
	"license": _attrgetter("metadata.license"),
	"authors": _some_attrgetter("metadata.author", "metadata.author_email"),
	"maintainers": _some_attrgetter("metadata.maintainer", "metadata.maintainer_email"),
	"keywords": _attrgetter("metadata.keywords"),
	"classifiers": _attrgetter("metadata.classifiers"),
	"urls": _attrgetter("metadata.project_urls"),
	"entry-points": _attrgetter("entry_points"),
	"dependencies": _some_attrgetter("_orig_install_requires", "install_requires"),
	"optional-dependencies": _some_attrgetter("_orig_extras_require", "extras_require"),
	}


	class _WouldIgnoreField(UserWarning):
	"""Inform users that ``pyproject.toml`` would overwrite previous metadata."""

	MESSAGE = """\
	{field!r} defined outside of `pyproject.toml` would be ignored.
	!!\n\n
	##########################################################################
	# configuration would be ignored/result in error due to `pyproject.toml` #
	##########################################################################

	The following seems to be defined outside of `pyproject.toml`:

	`{field} = {value!r}`

	According to the spec (see the link below), however, setuptools CANNOT
	consider this value unless {field!r} is listed as `dynamic`.

	https://packaging.python.org/en/latest/specifications/declaring-project-metadata/

	For the time being, `setuptools` will still consider the given value (as a
	transitional measure), but please note that future releases of setuptools will
	follow strictly the standard.

	To prevent this warning, you can list {field!r} under `dynamic` or alternatively
	remove the `[project]` table from your file and rely entirely on other means of
	configuration.
	\n\n!!
	"""

	@classmethod
	def message(cls, field, value):
	from inspect import cleandoc
	return cleandoc(cls.MESSAGE.format(field=field, value=value))