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# Copyright 2024 The etils Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""`etils` internal utils."""
from collections.abc import Callable
import contextlib
import functools
from typing import Any, Iterator, TypeVar
from etils.epy import reraise_utils
_FnT = TypeVar('_FnT')
@contextlib.contextmanager
def check_missing_deps() -> Iterator[None]:
"""Raise a better error message in case of `ImportError`.
Usage:
```python
from etils.epy import _internal
with _internal.check_missing_deps():
# pylint: disable=g-import-not-at-top
import xyz
# pylint: enable=g-import-not-at-top
```
Yields:
None
"""
try:
yield
except ImportError as e:
reraise_utils.reraise(
e,
suffix=(
'\nEach etils sub-modules require deps to be installed separately '
'(e.g. `from etils import ecolab` -> `pip install etils[ecolab]`)'
),
)
def unwrap_on_reload(fn: _FnT) -> _FnT:
"""Unwrap the function to support colab module reload."""
return getattr(fn, '__original_fn__', fn)
def wraps_with_reload(fn: Callable[..., Any]) -> Callable[[_FnT], _FnT]:
"""Wrap the function to support colab module reload."""
def decorator(fn_to_wrap):
fn_to_wrap = functools.wraps(fn)(fn_to_wrap)
fn_to_wrap.__original_fn__ = fn
return fn_to_wrap
return decorator
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