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color: change color of grep.rev label...
color: change color of grep.rev label GNU grep uses green for line numbers as we do, but I sometimes get a bit confused when I do `hg grep --diff -n` and get both line numbers and revisions and don't know which one is which. A different colour can help.

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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