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setupcfg.py
""" Load setuptools configuration from ``setup.cfg`` files. **API will be made private in the future** To read project metadata, consider using ``build.util.project_wheel_metadata`` (https://pypi.org/project/build/). For simple scenarios, you can also try parsing the file directly with the help of ``configparser``. """ from __future__ import annotations import contextlib import functools import os from collections import defaultdict from collections.abc import Iterable, Iterator from functools import partial, wraps from typing import TYPE_CHECKING, Any, Callable, ClassVar, Generic, TypeVar, cast from packaging.markers import default_environment as marker_env from packaging.requirements import InvalidRequirement, Requirement from packaging.specifiers import SpecifierSet from packaging.version import InvalidVersion, Version from .._path import StrPath from ..errors import FileError, OptionError from ..warnings import SetuptoolsDeprecationWarning from . import expand if TYPE_CHECKING: from typing_extensions import TypeAlias from setuptools.dist import Distribution from distutils.dist import DistributionMetadata SingleCommandOptions: TypeAlias = dict[str, tuple[str, Any]] """Dict that associate the name of the options of a particular command to a tuple. The first element of the tuple indicates the origin of the option value (e.g. the name of the configuration file where it was read from), while the second element of the tuple is the option value itself """ AllCommandOptions: TypeAlias = dict[str, SingleCommandOptions] """cmd name => its options""" Target = TypeVar("Target", "Distribution", "DistributionMetadata") def read_configuration( filepath: StrPath, find_others: bool = False, ignore_option_errors: bool = False ) -> dict: """Read given configuration file and returns options from it as a dict. :param str|unicode filepath: Path to configuration file to get options from. :param bool find_others: Whether to search for other configuration files which could be on in various places. :param bool ignore_option_errors: Whether to silently ignore options, values of which could not be resolved (e.g. due to exceptions in directives such as file:, attr:, etc.). If False exceptions are propagated as expected. :rtype: dict """ from setuptools.dist import Distribution dist = Distribution() filenames = dist.find_config_files() if find_others else [] handlers = _apply(dist, filepath, filenames, ignore_option_errors) return configuration_to_dict(handlers) def apply_configuration(dist: Distribution, filepath: StrPath) -> Distribution: """Apply the configuration from a ``setup.cfg`` file into an existing distribution object. """ _apply(dist, filepath) dist._finalize_requires() return dist def _apply( dist: Distribution, filepath: StrPath, other_files: Iterable[StrPath] = (), ignore_option_errors: bool = False, ) -> tuple[ConfigMetadataHandler, ConfigOptionsHandler]: """Read configuration from ``filepath`` and applies to the ``dist`` object.""" from setuptools.dist import _Distribution filepath = os.path.abspath(filepath) if not os.path.isfile(filepath): raise FileError(f'Configuration file {filepath} does not exist.') current_directory = os.getcwd() os.chdir(os.path.dirname(filepath)) filenames = [*other_files, filepath] try: # TODO: Temporary cast until mypy 1.12 is released with upstream fixes from typeshed _Distribution.parse_config_files(dist, filenames=cast(list[str], filenames)) handlers = parse_configuration( dist, dist.command_options, ignore_option_errors=ignore_option_errors ) dist._finalize_license_files() finally: os.chdir(current_directory) return handlers def _get_option(target_obj: Distribution | DistributionMetadata, key: str): """ Given a target object and option key, get that option from the target object, either through a get_{key} method or from an attribute directly. """ getter_name = f'get_{key}' by_attribute = functools.partial(getattr, target_obj, key) getter = getattr(target_obj, getter_name, by_attribute) return getter() def configuration_to_dict( handlers: Iterable[ ConfigHandler[Distribution] | ConfigHandler[DistributionMetadata] ], ) -> dict: """Returns configuration data gathered by given handlers as a dict. :param Iterable[ConfigHandler] handlers: Handlers list, usually from parse_configuration() :rtype: dict """ config_dict: dict = defaultdict(dict) for handler in handlers: for option in handler.set_options: value = _get_option(handler.target_obj, option) config_dict[handler.section_prefix][option] = value return config_dict def parse_configuration( distribution: Distribution, command_options: AllCommandOptions, ignore_option_errors: bool = False, ) -> tuple[ConfigMetadataHandler, ConfigOptionsHandler]: """Performs additional parsing of configuration options for a distribution. Returns a list of used option handlers. :param Distribution distribution: :param dict command_options: :param bool ignore_option_errors: Whether to silently ignore options, values of which could not be resolved (e.g. due to exceptions in directives such as file:, attr:, etc.). If False exceptions are propagated as expected. :rtype: list """ with expand.EnsurePackagesDiscovered(distribution) as ensure_discovered: options = ConfigOptionsHandler( distribution, command_options, ignore_option_errors, ensure_discovered, ) options.parse() if not distribution.package_dir: distribution.package_dir = options.package_dir # Filled by `find_packages` meta = ConfigMetadataHandler( distribution.metadata, command_options, ignore_option_errors, ensure_discovered, distribution.package_dir, distribution.src_root, ) meta.parse() distribution._referenced_files.update( options._referenced_files, meta._referenced_files ) return meta, options def _warn_accidental_env_marker_misconfig(label: str, orig_value: str, parsed: list): """Because users sometimes misinterpret this configuration: [options.extras_require] foo = bar;python_version<"4" It looks like one requirement with an environment marker but because there is no newline, it's parsed as two requirements with a semicolon as separator. Therefore, if: * input string does not contain a newline AND * parsed result contains two requirements AND * parsing of the two parts from the result ("<first>;<second>") leads in a valid Requirement with a valid marker a UserWarning is shown to inform the user about the possible problem. """ if "\n" in orig_value or len(parsed) != 2: return markers = marker_env().keys() try: req = Requirement(parsed[1]) if req.name in markers: _AmbiguousMarker.emit(field=label, req=parsed[1]) except InvalidRequirement as ex: if any(parsed[1].startswith(marker) for marker in markers): msg = _AmbiguousMarker.message(field=label, req=parsed[1]) raise InvalidRequirement(msg) from ex class ConfigHandler(Generic[Target]): """Handles metadata supplied in configuration files.""" section_prefix: str """Prefix for config sections handled by this handler. Must be provided by class heirs. """ aliases: ClassVar[dict[str, str]] = {} """Options aliases. For compatibility with various packages. E.g.: d2to1 and pbr. Note: `-` in keys is replaced with `_` by config parser. """ def __init__( self, target_obj: Target, options: AllCommandOptions, ignore_option_errors, ensure_discovered: expand.EnsurePackagesDiscovered, ) -> None: self.ignore_option_errors = ignore_option_errors self.target_obj: Target = target_obj self.sections = dict(self._section_options(options)) self.set_options: list[str] = [] self.ensure_discovered = ensure_discovered self._referenced_files: set[str] = set() """After parsing configurations, this property will enumerate all files referenced by the "file:" directive. Private API for setuptools only. """ @classmethod def _section_options( cls, options: AllCommandOptions ) -> Iterator[tuple[str, SingleCommandOptions]]: for full_name, value in options.items(): pre, _sep, name = full_name.partition(cls.section_prefix) if pre: continue yield name.lstrip('.'), value @property def parsers(self): """Metadata item name to parser function mapping.""" raise NotImplementedError( '%s must provide .parsers property' % self.__class__.__name__ ) def __setitem__(self, option_name, value) -> None: target_obj = self.target_obj # Translate alias into real name. option_name = self.aliases.get(option_name, option_name) try: current_value = getattr(target_obj, option_name) except AttributeError as e: raise KeyError(option_name) from e if current_value: # Already inhabited. Skipping. return try: parsed = self.parsers.get(option_name, lambda x: x)(value) except (Exception,) * self.ignore_option_errors: return simple_setter = functools.partial(target_obj.__setattr__, option_name) setter = getattr(target_obj, f"set_{option_name}", simple_setter) setter(parsed) self.set_options.append(option_name) @classmethod def _parse_list(cls, value, separator=','): """Represents value as a list. Value is split either by separator (defaults to comma) or by lines. :param value: :param separator: List items separator character. :rtype: list """ if isinstance(value, list): # _get_parser_compound case return value if '\n' in value: value = value.splitlines() else: value = value.split(separator) return [chunk.strip() for chunk in value if chunk.strip()] @classmethod def _parse_dict(cls, value): """Represents value as a dict. :param value: :rtype: dict """ separator = '=' result = {} for line in cls._parse_list(value): key, sep, val = line.partition(separator) if sep != separator: raise OptionError(f"Unable to parse option value to dict: {value}") result[key.strip()] = val.strip() return result @classmethod def _parse_bool(cls, value): """Represents value as boolean. :param value: :rtype: bool """ value = value.lower() return value in ('1', 'true', 'yes') @classmethod def _exclude_files_parser(cls, key): """Returns a parser function to make sure field inputs are not files. Parses a value after getting the key so error messages are more informative. :param key: :rtype: callable """ def parser(value): exclude_directive = 'file:' if value.startswith(exclude_directive): raise ValueError( f'Only strings are accepted for the {key} field, ' 'files are not accepted' ) return value return parser def _parse_file(self, value, root_dir: StrPath | None): """Represents value as a string, allowing including text from nearest files using `file:` directive. Directive is sandboxed and won't reach anything outside directory with setup.py. Examples: file: README.rst, CHANGELOG.md, src/file.txt :param str value: :rtype: str """ include_directive = 'file:' if not isinstance(value, str): return value if not value.startswith(include_directive): return value spec = value[len(include_directive) :] filepaths = [path.strip() for path in spec.split(',')] self._referenced_files.update(filepaths) return expand.read_files(filepaths, root_dir) def _parse_attr(self, value, package_dir, root_dir: StrPath): """Represents value as a module attribute. Examples: attr: package.attr attr: package.module.attr :param str value: :rtype: str """ attr_directive = 'attr:' if not value.startswith(attr_directive): return value attr_desc = value.replace(attr_directive, '') # Make sure package_dir is populated correctly, so `attr:` directives can work package_dir.update(self.ensure_discovered.package_dir) return expand.read_attr(attr_desc, package_dir, root_dir) @classmethod def _get_parser_compound(cls, *parse_methods): """Returns parser function to represents value as a list. Parses a value applying given methods one after another. :param parse_methods: :rtype: callable """ def parse(value): parsed = value for method in parse_methods: parsed = method(parsed) return parsed return parse @classmethod def _parse_section_to_dict_with_key(cls, section_options, values_parser): """Parses section options into a dictionary. Applies a given parser to each option in a section. :param dict section_options: :param callable values_parser: function with 2 args corresponding to key, value :rtype: dict """ value = {} for key, (_, val) in section_options.items(): value[key] = values_parser(key, val) return value @classmethod def _parse_section_to_dict(cls, section_options, values_parser=None): """Parses section options into a dictionary. Optionally applies a given parser to each value. :param dict section_options: :param callable values_parser: function with 1 arg corresponding to option value :rtype: dict """ parser = (lambda _, v: values_parser(v)) if values_parser else (lambda _, v: v) return cls._parse_section_to_dict_with_key(section_options, parser) def parse_section(self, section_options) -> None: """Parses configuration file section. :param dict section_options: """ for name, (_, value) in section_options.items(): with contextlib.suppress(KeyError): # Keep silent for a new option may appear anytime. self[name] = value def parse(self) -> None: """Parses configuration file items from one or more related sections. """ for section_name, section_options in self.sections.items(): method_postfix = '' if section_name: # [section.option] variant method_postfix = f"_{section_name}" section_parser_method: Callable | None = getattr( self, # Dots in section names are translated into dunderscores. f'parse_section{method_postfix}'.replace('.', '__'), None, ) if section_parser_method is None: raise OptionError( "Unsupported distribution option section: " f"[{self.section_prefix}.{section_name}]" ) section_parser_method(section_options) def _deprecated_config_handler(self, func, msg, **kw): """this function will wrap around parameters that are deprecated :param msg: deprecation message :param func: function to be wrapped around """ @wraps(func) def config_handler(*args, **kwargs): kw.setdefault("stacklevel", 2) _DeprecatedConfig.emit("Deprecated config in `setup.cfg`", msg, **kw) return func(*args, **kwargs) return config_handler class ConfigMetadataHandler(ConfigHandler["DistributionMetadata"]): section_prefix = 'metadata' aliases = { 'home_page': 'url', 'summary': 'description', 'classifier': 'classifiers', 'platform': 'platforms', } strict_mode = False """We need to keep it loose, to be partially compatible with `pbr` and `d2to1` packages which also uses `metadata` section. """ def __init__( self, target_obj: DistributionMetadata, options: AllCommandOptions, ignore_option_errors: bool, ensure_discovered: expand.EnsurePackagesDiscovered, package_dir: dict | None = None, root_dir: StrPath | None = os.curdir, ) -> None: super().__init__(target_obj, options, ignore_option_errors, ensure_discovered) self.package_dir = package_dir self.root_dir = root_dir @property def parsers(self): """Metadata item name to parser function mapping.""" parse_list = self._parse_list parse_file = partial(self._parse_file, root_dir=self.root_dir) parse_dict = self._parse_dict exclude_files_parser = self._exclude_files_parser return { 'platforms': parse_list, 'keywords': parse_list, 'provides': parse_list, 'obsoletes': parse_list, 'classifiers': self._get_parser_compound(parse_file, parse_list), 'license': exclude_files_parser('license'), 'license_files': parse_list, 'description': parse_file, 'long_description': parse_file, 'version': self._parse_version, 'project_urls': parse_dict, } def _parse_version(self, value): """Parses `version` option value. :param value: :rtype: str """ version = self._parse_file(value, self.root_dir) if version != value: version = version.strip() # Be strict about versions loaded from file because it's easy to # accidentally include newlines and other unintended content try: Version(version) except InvalidVersion as e: raise OptionError( f'Version loaded from {value} does not ' f'comply with PEP 440: {version}' ) from e return version return expand.version(self._parse_attr(value, self.package_dir, self.root_dir)) class ConfigOptionsHandler(ConfigHandler["Distribution"]): section_prefix = 'options' def __init__( self, target_obj: Distribution, options: AllCommandOptions, ignore_option_errors: bool, ensure_discovered: expand.EnsurePackagesDiscovered, ) -> None: super().__init__(target_obj, options, ignore_option_errors, ensure_discovered) self.root_dir = target_obj.src_root self.package_dir: dict[str, str] = {} # To be filled by `find_packages` @classmethod def _parse_list_semicolon(cls, value): return cls._parse_list(value, separator=';') def _parse_file_in_root(self, value): return self._parse_file(value, root_dir=self.root_dir) def _parse_requirements_list(self, label: str, value: str): # Parse a requirements list, either by reading in a `file:`, or a list. parsed = self._parse_list_semicolon(self._parse_file_in_root(value)) _warn_accidental_env_marker_misconfig(label, value, parsed) # Filter it to only include lines that are not comments. `parse_list` # will have stripped each line and filtered out empties. return [line for line in parsed if not line.startswith("#")] @property def parsers(self): """Metadata item name to parser function mapping.""" parse_list = self._parse_list parse_bool = self._parse_bool parse_dict = self._parse_dict parse_cmdclass = self._parse_cmdclass return { 'zip_safe': parse_bool, 'include_package_data': parse_bool, 'package_dir': parse_dict, 'scripts': parse_list, 'eager_resources': parse_list, 'dependency_links': parse_list, 'namespace_packages': self._deprecated_config_handler( parse_list, "The namespace_packages parameter is deprecated, " "consider using implicit namespaces instead (PEP 420).", # TODO: define due date, see setuptools.dist:check_nsp. ), 'install_requires': partial( self._parse_requirements_list, "install_requires" ), 'setup_requires': self._parse_list_semicolon, 'packages': self._parse_packages, 'entry_points': self._parse_file_in_root, 'py_modules': parse_list, 'python_requires': SpecifierSet, 'cmdclass': parse_cmdclass, } def _parse_cmdclass(self, value): package_dir = self.ensure_discovered.package_dir return expand.cmdclass(self._parse_dict(value), package_dir, self.root_dir) def _parse_packages(self, value): """Parses `packages` option value. :param value: :rtype: list """ find_directives = ['find:', 'find_namespace:'] trimmed_value = value.strip() if trimmed_value not in find_directives: return self._parse_list(value) # Read function arguments from a dedicated section. find_kwargs = self.parse_section_packages__find( self.sections.get('packages.find', {}) ) find_kwargs.update( namespaces=(trimmed_value == find_directives[1]), root_dir=self.root_dir, fill_package_dir=self.package_dir, ) return expand.find_packages(**find_kwargs) def parse_section_packages__find(self, section_options): """Parses `packages.find` configuration file section. To be used in conjunction with _parse_packages(). :param dict section_options: """ section_data = self._parse_section_to_dict(section_options, self._parse_list) valid_keys = ['where', 'include', 'exclude'] find_kwargs = {k: v for k, v in section_data.items() if k in valid_keys and v} where = find_kwargs.get('where') if where is not None: find_kwargs['where'] = where[0] # cast list to single val return find_kwargs def parse_section_entry_points(self, section_options) -> None: """Parses `entry_points` configuration file section. :param dict section_options: """ parsed = self._parse_section_to_dict(section_options, self._parse_list) self['entry_points'] = parsed def _parse_package_data(self, section_options): package_data = self._parse_section_to_dict(section_options, self._parse_list) return expand.canonic_package_data(package_data) def parse_section_package_data(self, section_options) -> None: """Parses `package_data` configuration file section. :param dict section_options: """ self['package_data'] = self._parse_package_data(section_options) def parse_section_exclude_package_data(self, section_options) -> None: """Parses `exclude_package_data` configuration file section. :param dict section_options: """ self['exclude_package_data'] = self._parse_package_data(section_options) def parse_section_extras_require(self, section_options) -> None: """Parses `extras_require` configuration file section. :param dict section_options: """ parsed = self._parse_section_to_dict_with_key( section_options, lambda k, v: self._parse_requirements_list(f"extras_require[{k}]", v), ) self['extras_require'] = parsed def parse_section_data_files(self, section_options) -> None: """Parses `data_files` configuration file section. :param dict section_options: """ parsed = self._parse_section_to_dict(section_options, self._parse_list) self['data_files'] = expand.canonic_data_files(parsed, self.root_dir) class _AmbiguousMarker(SetuptoolsDeprecationWarning): _SUMMARY = "Ambiguous requirement marker." _DETAILS = """ One of the parsed requirements in `{field}` looks like a valid environment marker: {req!r} Please make sure that the configuration file is correct. You can use dangling lines to avoid this problem. """ _SEE_DOCS = "userguide/declarative_config.html#opt-2" # TODO: should we include due_date here? Initially introduced in 6 Aug 2022. # Does this make sense with latest version of packaging? @classmethod def message(cls, **kw): docs = f"https://setuptools.pypa.io/en/latest/{cls._SEE_DOCS}" return cls._format(cls._SUMMARY, cls._DETAILS, see_url=docs, format_args=kw) class _DeprecatedConfig(SetuptoolsDeprecationWarning): _SEE_DOCS = "userguide/declarative_config.html"
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