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exchange: move _computeellipsis() from narrow...
exchange: move _computeellipsis() from narrow This is also referenced as part of the narrow changegroup code and therefore needs to move to core before we can integrate the narrow changegroup code into core. Differential Revision: https://phab.mercurial-scm.org/D4009

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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