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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
#
import argparse
from typing import Generator, Type
from libcst.codemod import Codemod, MagicArgsCodemodCommand
from libcst.codemod.visitors import AddImportsVisitor
class EnsureImportPresentCommand(MagicArgsCodemodCommand):
DESCRIPTION: str = (
"Given a module and possibly an entity in that module, add an import "
+ "as long as one does not already exist."
)
@staticmethod
def add_args(arg_parser: argparse.ArgumentParser) -> None:
arg_parser.add_argument(
"--module",
dest="module",
metavar="MODULE",
help="Module that should be imported.",
type=str,
required=True,
)
arg_parser.add_argument(
"--entity",
dest="entity",
metavar="ENTITY",
help=(
"Entity that should be imported from module. If left empty, entire "
+ " module will be imported."
),
type=str,
default=None,
)
arg_parser.add_argument(
"--alias",
dest="alias",
metavar="ALIAS",
help=(
"Alias that will be used for the imported module or entity. If left "
+ "empty, no alias will be applied."
),
type=str,
default=None,
)
def get_transforms(self) -> Generator[Type[Codemod], None, None]:
AddImportsVisitor.add_needed_import(
self.context,
self.context.scratch["module"],
self.context.scratch["entity"],
self.context.scratch["alias"],
)
yield AddImportsVisitor
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