+++ /dev/null
-"""A PEP 517 interface to setuptools
-
-Previously, when a user or a command line tool (let's call it a "frontend")
-needed to make a request of setuptools to take a certain action, for
-example, generating a list of installation requirements, the frontend would
-would call "setup.py egg_info" or "setup.py bdist_wheel" on the command line.
-
-PEP 517 defines a different method of interfacing with setuptools. Rather
-than calling "setup.py" directly, the frontend should:
-
- 1. Set the current directory to the directory with a setup.py file
- 2. Import this module into a safe python interpreter (one in which
- setuptools can potentially set global variables or crash hard).
- 3. Call one of the functions defined in PEP 517.
-
-What each function does is defined in PEP 517. However, here is a "casual"
-definition of the functions (this definition should not be relied on for
-bug reports or API stability):
-
- - `build_wheel`: build a wheel in the folder and return the basename
- - `get_requires_for_build_wheel`: get the `setup_requires` to build
- - `prepare_metadata_for_build_wheel`: get the `install_requires`
- - `build_sdist`: build an sdist in the folder and return the basename
- - `get_requires_for_build_sdist`: get the `setup_requires` to build
-
-Again, this is not a formal definition! Just a "taste" of the module.
-"""
-
-import os
-import sys
-import tokenize
-import shutil
-import contextlib
-
-import setuptools
-import distutils
-
-
-class SetupRequirementsError(BaseException):
- def __init__(self, specifiers):
- self.specifiers = specifiers
-
-
-class Distribution(setuptools.dist.Distribution):
- def fetch_build_eggs(self, specifiers):
- raise SetupRequirementsError(specifiers)
-
- @classmethod
- @contextlib.contextmanager
- def patch(cls):
- """
- Replace
- distutils.dist.Distribution with this class
- for the duration of this context.
- """
- orig = distutils.core.Distribution
- distutils.core.Distribution = cls
- try:
- yield
- finally:
- distutils.core.Distribution = orig
-
-
-def _run_setup(setup_script='setup.py'):
- # Note that we can reuse our build directory between calls
- # Correctness comes first, then optimization later
- __file__ = setup_script
- __name__ = '__main__'
- f = getattr(tokenize, 'open', open)(__file__)
- code = f.read().replace('\\r\\n', '\\n')
- f.close()
- exec(compile(code, __file__, 'exec'), locals())
-
-
-def _fix_config(config_settings):
- config_settings = config_settings or {}
- config_settings.setdefault('--global-option', [])
- return config_settings
-
-
-def _get_build_requires(config_settings):
- config_settings = _fix_config(config_settings)
- requirements = ['setuptools', 'wheel']
-
- sys.argv = sys.argv[:1] + ['egg_info'] + \
- config_settings["--global-option"]
- try:
- with Distribution.patch():
- _run_setup()
- except SetupRequirementsError as e:
- requirements += e.specifiers
-
- return requirements
-
-
-def _get_immediate_subdirectories(a_dir):
- return [name for name in os.listdir(a_dir)
- if os.path.isdir(os.path.join(a_dir, name))]
-
-
-def get_requires_for_build_wheel(config_settings=None):
- config_settings = _fix_config(config_settings)
- return _get_build_requires(config_settings)
-
-
-def get_requires_for_build_sdist(config_settings=None):
- config_settings = _fix_config(config_settings)
- return _get_build_requires(config_settings)
-
-
-def prepare_metadata_for_build_wheel(metadata_directory, config_settings=None):
- sys.argv = sys.argv[:1] + ['dist_info', '--egg-base', metadata_directory]
- _run_setup()
-
- dist_info_directory = metadata_directory
- while True:
- dist_infos = [f for f in os.listdir(dist_info_directory)
- if f.endswith('.dist-info')]
-
- if len(dist_infos) == 0 and \
- len(_get_immediate_subdirectories(dist_info_directory)) == 1:
- dist_info_directory = os.path.join(
- dist_info_directory, os.listdir(dist_info_directory)[0])
- continue
-
- assert len(dist_infos) == 1
- break
-
- # PEP 517 requires that the .dist-info directory be placed in the
- # metadata_directory. To comply, we MUST copy the directory to the root
- if dist_info_directory != metadata_directory:
- shutil.move(
- os.path.join(dist_info_directory, dist_infos[0]),
- metadata_directory)
- shutil.rmtree(dist_info_directory, ignore_errors=True)
-
- return dist_infos[0]
-
-
-def build_wheel(wheel_directory, config_settings=None,
- metadata_directory=None):
- config_settings = _fix_config(config_settings)
- wheel_directory = os.path.abspath(wheel_directory)
- sys.argv = sys.argv[:1] + ['bdist_wheel'] + \
- config_settings["--global-option"]
- _run_setup()
- if wheel_directory != 'dist':
- shutil.rmtree(wheel_directory)
- shutil.copytree('dist', wheel_directory)
-
- wheels = [f for f in os.listdir(wheel_directory)
- if f.endswith('.whl')]
-
- assert len(wheels) == 1
- return wheels[0]
-
-
-def build_sdist(sdist_directory, config_settings=None):
- config_settings = _fix_config(config_settings)
- sdist_directory = os.path.abspath(sdist_directory)
- sys.argv = sys.argv[:1] + ['sdist'] + \
- config_settings["--global-option"]
- _run_setup()
- if sdist_directory != 'dist':
- shutil.rmtree(sdist_directory)
- shutil.copytree('dist', sdist_directory)
-
- sdists = [f for f in os.listdir(sdist_directory)
- if f.endswith('.tar.gz')]
-
- assert len(sdists) == 1
- return sdists[0]
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