Mini Shell
from __future__ import absolute_import, unicode_literals
import io
import os
import sys
from collections import defaultdict
from functools import partial
from importlib import import_module
from distutils.errors import DistutilsOptionError, DistutilsFileError
from setuptools.extern.six import string_types
def read_configuration(
filepath, find_others=False, ignore_option_errors=False):
"""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, _Distribution
filepath = os.path.abspath(filepath)
if not os.path.isfile(filepath):
raise DistutilsFileError(
'Configuration file %s does not exist.' % filepath)
current_directory = os.getcwd()
os.chdir(os.path.dirname(filepath))
try:
dist = Distribution()
filenames = dist.find_config_files() if find_others else []
if filepath not in filenames:
filenames.append(filepath)
_Distribution.parse_config_files(dist, filenames=filenames)
handlers = parse_configuration(
dist, dist.command_options,
ignore_option_errors=ignore_option_errors)
finally:
os.chdir(current_directory)
return configuration_to_dict(handlers)
def configuration_to_dict(handlers):
"""Returns configuration data gathered by given handlers as a dict.
:param list[ConfigHandler] handlers: Handlers list,
usually from parse_configuration()
:rtype: dict
"""
config_dict = defaultdict(dict)
for handler in handlers:
obj_alias = handler.section_prefix
target_obj = handler.target_obj
for option in handler.set_options:
getter = getattr(target_obj, 'get_%s' % option, None)
if getter is None:
value = getattr(target_obj, option)
else:
value = getter()
config_dict[obj_alias][option] = value
return config_dict
def parse_configuration(
distribution, command_options, ignore_option_errors=False):
"""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
"""
meta = ConfigMetadataHandler(
distribution.metadata, command_options, ignore_option_errors)
meta.parse()
options = ConfigOptionsHandler(
distribution, command_options, ignore_option_errors)
options.parse()
return meta, options
class ConfigHandler(object):
"""Handles metadata supplied in configuration files."""
section_prefix = None
"""Prefix for config sections handled by this handler.
Must be provided by class heirs.
"""
aliases = {}
"""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, options, ignore_option_errors=False):
sections = {}
section_prefix = self.section_prefix
for section_name, section_options in options.items():
if not section_name.startswith(section_prefix):
continue
section_name = section_name.replace(section_prefix, '').strip('.')
sections[section_name] = section_options
self.ignore_option_errors = ignore_option_errors
self.target_obj = target_obj
self.sections = sections
self.set_options = []
@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):
unknown = tuple()
target_obj = self.target_obj
# Translate alias into real name.
option_name = self.aliases.get(option_name, option_name)
current_value = getattr(target_obj, option_name, unknown)
if current_value is unknown:
raise KeyError(option_name)
if current_value:
# Already inhabited. Skipping.
return
skip_option = False
parser = self.parsers.get(option_name)
if parser:
try:
value = parser(value)
except Exception:
skip_option = True
if not self.ignore_option_errors:
raise
if skip_option:
return
setter = getattr(target_obj, 'set_%s' % option_name, None)
if setter is None:
setattr(target_obj, option_name, value)
else:
setter(value)
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 DistutilsOptionError(
'Unable to parse option value to dict: %s' % 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 _parse_file(cls, value):
"""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: LICENSE
file: README.rst, CHANGELOG.md, src/file.txt
:param str value:
:rtype: str
"""
include_directive = 'file:'
if not isinstance(value, string_types):
return value
if not value.startswith(include_directive):
return value
spec = value[len(include_directive):]
filepaths = (os.path.abspath(path.strip()) for path in spec.split(','))
return '\n'.join(
cls._read_file(path)
for path in filepaths
if (cls._assert_local(path) or True)
and os.path.isfile(path)
)
@staticmethod
def _assert_local(filepath):
if not filepath.startswith(os.getcwd()):
raise DistutilsOptionError(
'`file:` directive can not access %s' % filepath)
@staticmethod
def _read_file(filepath):
with io.open(filepath, encoding='utf-8') as f:
return f.read()
@classmethod
def _parse_attr(cls, value):
"""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
attrs_path = value.replace(attr_directive, '').strip().split('.')
attr_name = attrs_path.pop()
module_name = '.'.join(attrs_path)
module_name = module_name or '__init__'
sys.path.insert(0, os.getcwd())
try:
module = import_module(module_name)
value = getattr(module, attr_name)
finally:
sys.path = sys.path[1:]
return value
@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(cls, section_options, values_parser=None):
"""Parses section options into a dictionary.
Optionally applies a given parser to values.
:param dict section_options:
:param callable values_parser:
:rtype: dict
"""
value = {}
values_parser = values_parser or (lambda val: val)
for key, (_, val) in section_options.items():
value[key] = values_parser(val)
return value
def parse_section(self, section_options):
"""Parses configuration file section.
:param dict section_options:
"""
for (name, (_, value)) in section_options.items():
try:
self[name] = value
except KeyError:
pass # Keep silent for a new option may appear anytime.
def parse(self):
"""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 = '_%s' % section_name
section_parser_method = getattr(
self,
# Dots in section names are tranlsated into dunderscores.
('parse_section%s' % method_postfix).replace('.', '__'),
None)
if section_parser_method is None:
raise DistutilsOptionError(
'Unsupported distribution option section: [%s.%s]' % (
self.section_prefix, section_name))
section_parser_method(section_options)
class ConfigMetadataHandler(ConfigHandler):
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.
"""
@property
def parsers(self):
"""Metadata item name to parser function mapping."""
parse_list = self._parse_list
parse_file = self._parse_file
parse_dict = self._parse_dict
return {
'platforms': parse_list,
'keywords': parse_list,
'provides': parse_list,
'requires': parse_list,
'obsoletes': parse_list,
'classifiers': self._get_parser_compound(parse_file, parse_list),
'license': parse_file,
'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_attr(value)
if callable(version):
version = version()
if not isinstance(version, string_types):
if hasattr(version, '__iter__'):
version = '.'.join(map(str, version))
else:
version = '%s' % version
return version
class ConfigOptionsHandler(ConfigHandler):
section_prefix = 'options'
@property
def parsers(self):
"""Metadata item name to parser function mapping."""
parse_list = self._parse_list
parse_list_semicolon = partial(self._parse_list, separator=';')
parse_bool = self._parse_bool
parse_dict = self._parse_dict
return {
'zip_safe': parse_bool,
'use_2to3': parse_bool,
'include_package_data': parse_bool,
'package_dir': parse_dict,
'use_2to3_fixers': parse_list,
'use_2to3_exclude_fixers': parse_list,
'convert_2to3_doctests': parse_list,
'scripts': parse_list,
'eager_resources': parse_list,
'dependency_links': parse_list,
'namespace_packages': parse_list,
'install_requires': parse_list_semicolon,
'setup_requires': parse_list_semicolon,
'tests_require': parse_list_semicolon,
'packages': self._parse_packages,
'entry_points': self._parse_file,
'py_modules': parse_list,
}
def _parse_packages(self, value):
"""Parses `packages` option value.
:param value:
:rtype: list
"""
find_directive = 'find:'
if not value.startswith(find_directive):
return self._parse_list(value)
# Read function arguments from a dedicated section.
find_kwargs = self.parse_section_packages__find(
self.sections.get('packages.find', {}))
from setuptools import find_packages
return 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 = dict(
[(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):
"""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):
parsed = self._parse_section_to_dict(section_options, self._parse_list)
root = parsed.get('*')
if root:
parsed[''] = root
del parsed['*']
return parsed
def parse_section_package_data(self, section_options):
"""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):
"""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):
"""Parses `extras_require` configuration file section.
:param dict section_options:
"""
parse_list = partial(self._parse_list, separator=';')
self['extras_require'] = self._parse_section_to_dict(
section_options, parse_list)
Zerion Mini Shell 1.0