mirror of
https://github.com/Garmelon/PFERD.git
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80 lines
2.3 KiB
Python
80 lines
2.3 KiB
Python
"""Helper functions and classes for temporary folders."""
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import logging
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import shutil
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from pathlib import Path
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from types import TracebackType
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from typing import Optional, Type
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from .location import Location
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LOGGER = logging.getLogger(__name__)
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class TmpDir(Location):
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"""A temporary folder that can create files or nested temp folders."""
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def __init__(self, path: Path):
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"""Create a new temporary folder for the given path."""
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super().__init__(path)
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self._counter = 0
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self.cleanup()
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self.path.mkdir(parents=True, exist_ok=True)
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def __str__(self) -> str:
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"""Format the folder as a string."""
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return f"Folder at {self.path}"
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def __enter__(self) -> 'TmpDir':
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"""Context manager entry function."""
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return self
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# pylint: disable=useless-return
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def __exit__(
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self,
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exc_type: Optional[Type[BaseException]],
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exc_value: Optional[BaseException],
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traceback: Optional[TracebackType],
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) -> Optional[bool]:
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"""Context manager exit function. Calls cleanup()."""
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self.cleanup()
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return None
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def new_path(self, prefix: Optional[str] = None) -> Path:
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"""
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Return a unique path inside the directory. Doesn't create a file or
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directory.
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"""
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name = f"{prefix if prefix else 'tmp'}-{self._inc_and_get_counter():03}"
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LOGGER.debug("Creating temp file %s", name)
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return self.resolve(Path(name))
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def new_subdir(self, prefix: Optional[str] = None) -> 'TmpDir':
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"""
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Create a new nested temporary folder and return it.
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"""
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name = f"{prefix if prefix else 'tmp'}-{self._inc_and_get_counter():03}"
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sub_path = self.resolve(Path(name))
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sub_path.mkdir(parents=True)
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LOGGER.debug("Creating temp dir %s at %s", name, sub_path)
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return TmpDir(sub_path)
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def cleanup(self) -> None:
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"""Delete this folder and all contained files."""
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LOGGER.debug("Deleting temp folder %s", self.path)
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if self.path.resolve().exists():
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shutil.rmtree(self.path.resolve())
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def _inc_and_get_counter(self) -> int:
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"""Get and increment the counter by one."""
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counter = self._counter
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self._counter += 1
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return counter
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