mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-23 05:10:40 +00:00
121 lines
3.1 KiB
ReStructuredText
121 lines
3.1 KiB
ReStructuredText
=============================
|
|
Polyfill for Flake8 Plugins
|
|
=============================
|
|
|
|
``flake8-polyfill`` is a package that provides some compatibility helpers for
|
|
Flake8 plugins that intend to support Flake8 2.x and 3.x simultaneously.
|
|
|
|
|
|
Installation
|
|
============
|
|
|
|
.. code-block:: bash
|
|
|
|
pip install flake8-polyfill
|
|
|
|
|
|
Usage
|
|
=====
|
|
|
|
Option Handling
|
|
---------------
|
|
|
|
One problem area with compatibility with Flake8 2.x and 3.x is the registering
|
|
options and receiving the parsed values.
|
|
|
|
Flake8 3.0 added extra parameters to the ``add_option`` method which don't
|
|
have the same effect on Flake8 2.x. To accomodate the change, this polyfill
|
|
module allows you to do:
|
|
|
|
.. code-block:: python
|
|
|
|
from flake8_polyfill import options
|
|
|
|
class MyFlake8Plugin(object):
|
|
@classmethod
|
|
def add_options(cls, parser):
|
|
options.register(parser, '--my-long-option-name',
|
|
parse_from_config=True,
|
|
comma_separated_list=True,
|
|
default='...',
|
|
help='...')
|
|
options.register(parser, '-m', '--my-other-long-option-name',
|
|
parse_from_config=True,
|
|
normalize_paths=True,
|
|
default='...',
|
|
help='...')
|
|
|
|
@classmethod
|
|
def parse_options(cls, values):
|
|
cls.my_long_option_name = values.my_long_option_name
|
|
cls.my_other_long_option_name = values.my_other_long_option_name
|
|
|
|
And have the code work the same way on both versions.
|
|
|
|
Retrieving Standard In
|
|
----------------------
|
|
|
|
Until Flake8 2.6, getting the code on standard in from a plugin has been
|
|
simple:
|
|
|
|
.. code-block:: python
|
|
|
|
import pep8
|
|
|
|
stdin = pep8.get_stdin_value()
|
|
|
|
In 2.6 you now have to know whether to use ``pep8`` or ``pycodestyle`` since
|
|
Flake8 2.6 made a hard change to ``pycodestyle``.
|
|
|
|
The reason you need to know which module to use is because standard in can be
|
|
exhausted and Flake8 does some work to cache the value so that call always
|
|
returns the desired data.
|
|
|
|
In 3.0, Flake8 no longer monkey-patches those modules.
|
|
|
|
To accommodate this, this package provides:
|
|
|
|
.. code-block:: python
|
|
|
|
from flake8_polyfill import stdin
|
|
|
|
stdin.monkey_patch('all')
|
|
stdin.monkey_patch('pep8')
|
|
stdin.monkey_patch('pycodestyle')
|
|
|
|
This allows you to have the polyfill module monkey-patch what you want so it
|
|
is always monkey-patched. It will also do so in an intelligent way.
|
|
|
|
Version Comparison
|
|
------------------
|
|
|
|
Flake8 2.x did not include an object that would allow for easy version
|
|
comparison. Flake8 3.0, however, added a ``__version_info__`` attribute. For
|
|
consistency, Flake8 Polyfill will turn 2.x's version string into a tuple
|
|
suitable for comparison.
|
|
|
|
.. code-block:: python
|
|
|
|
from flake8_polyfill import version
|
|
|
|
if (2, 4) <= version.version_info < (2, 6):
|
|
# ...
|
|
elif (2, 6) <= version.version_info < (3, 0):
|
|
# ...
|
|
elif (3, 0) <= version.version_info < (4, 0):
|
|
# ...
|
|
|
|
|
|
License
|
|
=======
|
|
|
|
MIT
|
|
|
|
|
|
Creator
|
|
=======
|
|
|
|
Ian Cordasco
|
|
|
|
|