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from __future__ import absolute_import, unicode_literals
from .base import PluginLoader
class Discovery(PluginLoader):
""" """
def get_discover(parser, args):
discover_types = Discovery.entry_points_for("virtualenv.discovery")
discovery_parser = parser.add_argument_group(
title="discovery",
description="discover and provide a target interpreter",
)
choices = _get_default_discovery(discover_types)
# prefer the builtin if present, otherwise fallback to first defined type
choices = sorted(choices, key=lambda a: 0 if a == "builtin" else 1)
discovery_parser.add_argument(
"--discovery",
choices=choices,
default=next(iter(choices)),
required=False,
help="interpreter discovery method",
)
options, _ = parser.parse_known_args(args)
discover_class = discover_types[options.discovery]
discover_class.add_parser_arguments(discovery_parser)
options, _ = parser.parse_known_args(args, namespace=options)
discover = discover_class(options)
return discover
def _get_default_discovery(discover_types):
return list(discover_types.keys())