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