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121 lines
3.1 KiB
ReStructuredText
121 lines
3.1 KiB
ReStructuredText
=============================
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Polyfill for Flake8 Plugins
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=============================
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``flake8-polyfill`` is a package that provides some compatibility helpers for
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Flake8 plugins that intend to support Flake8 2.x and 3.x simultaneously.
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Installation
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============
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.. code-block:: bash
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pip install flake8-polyfill
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Usage
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=====
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Option Handling
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---------------
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One problem area with compatibility with Flake8 2.x and 3.x is the registering
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options and receiving the parsed values.
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Flake8 3.0 added extra parameters to the ``add_option`` method which don't
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have the same effect on Flake8 2.x. To accomodate the change, this polyfill
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module allows you to do:
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.. code-block:: python
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from flake8_polyfill import options
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class MyFlake8Plugin(object):
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@classmethod
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def add_options(cls, parser):
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options.register(parser, '--my-long-option-name',
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parse_from_config=True,
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comma_separated_list=True,
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default='...',
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help='...')
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options.register(parser, '-m', '--my-other-long-option-name',
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parse_from_config=True,
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normalize_paths=True,
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default='...',
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help='...')
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@classmethod
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def parse_options(cls, values):
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cls.my_long_option_name = values.my_long_option_name
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cls.my_other_long_option_name = values.my_other_long_option_name
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And have the code work the same way on both versions.
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Retrieving Standard In
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----------------------
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Until Flake8 2.6, getting the code on standard in from a plugin has been
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simple:
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.. code-block:: python
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import pep8
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stdin = pep8.get_stdin_value()
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In 2.6 you now have to know whether to use ``pep8`` or ``pycodestyle`` since
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Flake8 2.6 made a hard change to ``pycodestyle``.
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The reason you need to know which module to use is because standard in can be
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exhausted and Flake8 does some work to cache the value so that call always
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returns the desired data.
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In 3.0, Flake8 no longer monkey-patches those modules.
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To accommodate this, this package provides:
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.. code-block:: python
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from flake8_polyfill import stdin
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stdin.monkey_patch('all')
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stdin.monkey_patch('pep8')
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stdin.monkey_patch('pycodestyle')
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This allows you to have the polyfill module monkey-patch what you want so it
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is always monkey-patched. It will also do so in an intelligent way.
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Version Comparison
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------------------
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Flake8 2.x did not include an object that would allow for easy version
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comparison. Flake8 3.0, however, added a ``__version_info__`` attribute. For
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consistency, Flake8 Polyfill will turn 2.x's version string into a tuple
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suitable for comparison.
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.. code-block:: python
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from flake8_polyfill import version
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if (2, 4) <= version.version_info < (2, 6):
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# ...
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elif (2, 6) <= version.version_info < (3, 0):
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# ...
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elif (3, 0) <= version.version_info < (4, 0):
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# ...
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License
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=======
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MIT
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Creator
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=======
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Ian Cordasco
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