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from __future__ import absolute_import, unicode_literals
from collections import OrderedDict, defaultdict, namedtuple
from virtualenv.create.describe import Describe
from virtualenv.create.via_global_ref.builtin.builtin_way import VirtualenvBuiltin
from .base import ComponentBuilder
CreatorInfo = namedtuple("CreatorInfo", ["key_to_class", "key_to_meta", "describe", "builtin_key"])
class CreatorSelector(ComponentBuilder):
def __init__(self, interpreter, parser):
creators, self.key_to_meta, self.describe, self.builtin_key = self.for_interpreter(interpreter)
super(CreatorSelector, self).__init__(interpreter, parser, "creator", creators)
@classmethod
def for_interpreter(cls, interpreter):
key_to_class, key_to_meta, builtin_key, describe = OrderedDict(), {}, None, None
errors = defaultdict(list)
for key, creator_class in cls.options("virtualenv.create").items():
if key == "builtin":
raise RuntimeError("builtin creator is a reserved name")
meta = creator_class.can_create(interpreter)
if meta:
if meta.error:
errors[meta.error].append(creator_class)
else:
if "builtin" not in key_to_class and issubclass(creator_class, VirtualenvBuiltin):
builtin_key = key
key_to_class["builtin"] = creator_class
key_to_meta["builtin"] = meta
key_to_class[key] = creator_class
key_to_meta[key] = meta
if describe is None and issubclass(creator_class, Describe) and creator_class.can_describe(interpreter):
describe = creator_class
if not key_to_meta:
if errors:
rows = ["{} for creators {}".format(k, ", ".join(i.__name__ for i in v)) for k, v in errors.items()]
raise RuntimeError("\n".join(rows))
else:
raise RuntimeError("No virtualenv implementation for {}".format(interpreter))
return CreatorInfo(
key_to_class=key_to_class,
key_to_meta=key_to_meta,
describe=describe,
builtin_key=builtin_key,
)
def add_selector_arg_parse(self, name, choices):
# prefer the built-in venv if present, otherwise fallback to first defined type
choices = sorted(choices, key=lambda a: 0 if a == "builtin" else 1)
default_value = self._get_default(choices)
self.parser.add_argument(
"--{}".format(name),
choices=choices,
default=default_value,
required=False,
help="create environment via{}".format(
"" if self.builtin_key is None else " (builtin = {})".format(self.builtin_key),
),
)
@staticmethod
def _get_default(choices):
return next(iter(choices))
def populate_selected_argparse(self, selected, app_data):
self.parser.description = "options for {} {}".format(self.name, selected)
self._impl_class.add_parser_arguments(self.parser, self.interpreter, self.key_to_meta[selected], app_data)
def create(self, options):
options.meta = self.key_to_meta[getattr(options, self.name)]
if not issubclass(self._impl_class, Describe):
options.describe = self.describe(options, self.interpreter)
return super(CreatorSelector, self).create(options)
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