meson/mesonbuild/mesondata.py

# Copyright 2021 The Meson development team

# 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.


import importlib.resources
from pathlib import PurePosixPath, Path
import typing as T

if T.TYPE_CHECKING:
    from .environment import Environment

class DataFile:
    def __init__(self, path: str) -> None:
        self.path = PurePosixPath(path)

    def write_once(self, path: Path) -> None:
        if not path.exists():
            data = importlib.resources.read_text( # [ignore encoding] it's on the next lines, Mr. Lint
                    ('mesonbuild' / self.path.parent).as_posix().replace('/', '.'),
                    self.path.name,
                    encoding='utf-8')
            path.write_text(data, encoding='utf-8')

    def write_to_private(self, env: 'Environment') -> Path:
        try:
            resource = importlib.resources.files('mesonbuild') / self.path
            if isinstance(resource, Path):
                return resource
        except AttributeError:
            # fall through to python 3.7 compatible code
            pass

        out_file = Path(env.scratch_dir) / 'data' / self.path.name
        out_file.parent.mkdir(exist_ok=True)
        self.write_once(out_file)
        return out_file