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import sys
import warnings
from typing import TYPE_CHECKING, List, Dict
from distutils.command.build import build as _build
from setuptools import SetuptoolsDeprecationWarning
if sys.version_info >= (3, 8):
from typing import Protocol
elif TYPE_CHECKING:
from typing_extensions import Protocol
else:
from abc import ABC as Protocol
_ORIGINAL_SUBCOMMANDS = {"build_py", "build_clib", "build_ext", "build_scripts"}
class build(_build):
# copy to avoid sharing the object with parent class
sub_commands = _build.sub_commands[:]
def get_sub_commands(self):
subcommands = {cmd[0] for cmd in _build.sub_commands}
if subcommands - _ORIGINAL_SUBCOMMANDS:
msg = """
It seems that you are using `distutils.command.build` to add
new subcommands. Using `distutils` directly is considered deprecated,
please use `setuptools.command.build`.
"""
warnings.warn(msg, SetuptoolsDeprecationWarning)
self.sub_commands = _build.sub_commands
return super().get_sub_commands()
class SubCommand(Protocol):
"""In order to support editable installations (see :pep:`660`) all
build subcommands **SHOULD** implement this protocol. They also **MUST** inherit
from ``setuptools.Command``.
When creating an :pep:`editable wheel <660>`, ``setuptools`` will try to evaluate
custom ``build`` subcommands using the following procedure:
1. ``setuptools`` will set the ``editable_mode`` attribute to ``True``
2. ``setuptools`` will execute the ``run()`` command.
.. important::
Subcommands **SHOULD** take advantage of ``editable_mode=True`` to adequate
its behaviour or perform optimisations.
For example, if a subcommand doesn't need to generate an extra file and
all it does is to copy a source file into the build directory,
``run()`` **SHOULD** simply "early return".
Similarly, if the subcommand creates files that would be placed alongside
Python files in the final distribution, during an editable install
the command **SHOULD** generate these files "in place" (i.e. write them to
the original source directory, instead of using the build directory).
Note that ``get_output_mapping()`` should reflect that and include mappings
for "in place" builds accordingly.
3. ``setuptools`` use any knowledge it can derive from the return values of
``get_outputs()`` and ``get_output_mapping()`` to create an editable wheel.
When relevant ``setuptools`` **MAY** attempt to use file links based on the value
of ``get_output_mapping()``. Alternatively, ``setuptools`` **MAY** attempt to use
:doc:`import hooks <python:reference/import>` to redirect any attempt to import
to the directory with the original source code and other files built in place.
Please note that custom sub-commands **SHOULD NOT** rely on ``run()`` being
executed (or not) to provide correct return values for ``get_outputs()``,
``get_output_mapping()`` or ``get_source_files()``. The ``get_*`` methods should
work independently of ``run()``.
"""
editable_mode: bool = False
"""Boolean flag that will be set to ``True`` when setuptools is used for an
editable installation (see :pep:`660`).
Implementations **SHOULD** explicitly set the default value of this attribute to
``False``.
When subcommands run, they can use this flag to perform optimizations or change
their behaviour accordingly.
"""
build_lib: str
"""String representing the directory where the build artifacts should be stored,
e.g. ``build/lib``.
For example, if a distribution wants to provide a Python module named ``pkg.mod``,
then a corresponding file should be written to ``{build_lib}/package/module.py``.
A way of thinking about this is that the files saved under ``build_lib``
would be eventually copied to one of the directories in :obj:`site.PREFIXES`
upon installation.
A command that produces platform-independent files (e.g. compiling text templates
into Python functions), **CAN** initialize ``build_lib`` by copying its value from
the ``build_py`` command. On the other hand, a command that produces
platform-specific files **CAN** initialize ``build_lib`` by copying its value from
the ``build_ext`` command. In general this is done inside the ``finalize_options``
method with the help of the ``set_undefined_options`` command::
def finalize_options(self):
self.set_undefined_options("build_py", ("build_lib", "build_lib"))
...
"""
def initialize_options(self):
"""(Required by the original :class:`setuptools.Command` interface)"""
def finalize_options(self):
"""(Required by the original :class:`setuptools.Command` interface)"""
def run(self):
"""(Required by the original :class:`setuptools.Command` interface)"""
def get_source_files(self) -> List[str]:
"""
Return a list of all files that are used by the command to create the expected
outputs.
For example, if your build command transpiles Java files into Python, you should
list here all the Java files.
The primary purpose of this function is to help populating the ``sdist``
with all the files necessary to build the distribution.
All files should be strings relative to the project root directory.
"""
def get_outputs(self) -> List[str]:
"""
Return a list of files intended for distribution as they would have been
produced by the build.
These files should be strings in the form of
``"{build_lib}/destination/file/path"``.
.. note::
The return value of ``get_output()`` should include all files used as keys
in ``get_output_mapping()`` plus files that are generated during the build
and don't correspond to any source file already present in the project.
"""
def get_output_mapping(self) -> Dict[str, str]:
"""
Return a mapping between destination files as they would be produced by the
build (dict keys) into the respective existing (source) files (dict values).
Existing (source) files should be represented as strings relative to the project
root directory.
Destination files should be strings in the form of
``"{build_lib}/destination/file/path"``.
"""