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py3: fix test-convert-svn-sink.t...
py3: fix test-convert-svn-sink.t In cases where the root commit is empty commit, None will be returned as parents. This was implemented by 2c13e91ede6e. This breaks test on py3 because `b'%s' % None` does not work. It does not matter whether we return `None` or `'None'` as we skipped converting to svn step by doing an early return. So let's return `'None'`. I tried to patch all the users to convert `None` to `'None'`, but there were more users than I expected. I hit 3 of them and decided to fix it this way around. Differential Revision: https://phab.mercurial-scm.org/D6458

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converters.py
24 lines | 531 B | text/x-python | PythonLexer
"""
Commonly useful converters.
"""
from __future__ import absolute_import, division, print_function
def optional(converter):
"""
A converter that allows an attribute to be optional. An optional attribute
is one which can be set to ``None``.
:param callable converter: the converter that is used for non-``None``
values.
.. versionadded:: 17.1.0
"""
def optional_converter(val):
if val is None:
return None
return converter(val)
return optional_converter