upstream/mercurial-mirror Files · mercurial/thirdparty/attr/converters.py

changegroup: don't limit cgv4 to revlogv2 repos...

changegroup: don't limit cgv4 to revlogv2 repos To help the transition from revlogv1 to revlogv2, we need to be able to enable cgv4 for revlogv1 repos, so that revlogv2 clients can handle adding/removing sidedata over the wire. Differential Revision: https://phab.mercurial-scm.org/D10342

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      """

      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

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				"""
				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