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annotate mercurial/thirdparty/attr/converters.py @ 39878:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents 765eb17a7eb8
children e1c586b9a43c
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1 """
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2 Commonly useful converters.
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3 """
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4
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5 from __future__ import absolute_import, division, print_function
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6
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7
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8 def optional(converter):
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9 """
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10 A converter that allows an attribute to be optional. An optional attribute
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11 is one which can be set to ``None``.
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12
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13 :param callable converter: the converter that is used for non-``None``
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14 values.
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15
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16 .. versionadded:: 17.1.0
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17 """
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18
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19 def optional_converter(val):
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20 if val is None:
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21 return None
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22 return converter(val)
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23
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24 return optional_converter