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path: introduce a `path://` syntax to reference other path name...

path: introduce a `path://` syntax to reference other path name This make it easier for a path to reuse the same location of another path with different parameter. This is useful to create path "alias" with common config option. This will become very useful to create path that reference a list of other path. This changeset focus on implemented the basic feature, future changesets will deal with various error management (and associated testing). Differential Revision: https://phab.mercurial-scm.org/D10263

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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