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fix: determine fixer tool failure by exit code instead of stderr...
fix: determine fixer tool failure by exit code instead of stderr This seems like the more natural thing, and it probably should have been this way to beign with. It is more flexible because it allows tools to emit diagnostic information while also modifying a file. An example would be an automatic code formatter that also prints any remaining lint issues. Differential Revision: https://phab.mercurial-scm.org/D4158

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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