mirror of
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93 lines
2.4 KiB
Python
93 lines
2.4 KiB
Python
from dataclasses import dataclass
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from pathlib import PurePath
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from typing import Set
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@dataclass
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class MarkDuplicateException(Exception):
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"""
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Tried to mark a file that was already marked.
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"""
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path: PurePath
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@dataclass
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class MarkConflictException(Exception):
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"""
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Marking the path would have caused a conflict.
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A conflict can have two reasons: Either the new file has the same path as
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the parent directory of a known file, or a parent directory of the new file
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has the same path as a known file. In either case, adding the new file
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would require a file and a directory to share the same path, which is
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usually not possible.
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"""
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path: PurePath
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collides_with: PurePath
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# TODO Use PurePath.is_relative_to when updating to 3.9
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def is_relative_to(a: PurePath, b: PurePath) -> bool:
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try:
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a.relative_to(b)
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return True
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except ValueError:
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return False
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class Report:
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"""
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A report of a synchronization. Includes all files found by the crawler, as
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well as the set of changes made to local files.
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"""
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def __init__(self) -> None:
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self.known_files: Set[PurePath] = set()
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self.new_files: Set[PurePath] = set()
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self.changed_files: Set[PurePath] = set()
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self.deleted_files: Set[PurePath] = set()
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def mark(self, path: PurePath) -> None:
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"""
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Mark a previously unknown file as known.
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May throw a MarkDuplicateException or a MarkConflictException. For more
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detail, see the respective exception's docstring.
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"""
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for known_path in self.known_files:
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if path == known_path:
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raise MarkDuplicateException(path)
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if is_relative_to(path, known_path) or is_relative_to(known_path, path):
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raise MarkConflictException(path, known_path)
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self.known_files.add(path)
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def marked(self, path: PurePath) -> bool:
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return path in self.known_files
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def add_file(self, path: PurePath) -> None:
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"""
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Unlike mark(), this function accepts any paths.
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"""
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self.new_files.add(path)
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def change_file(self, path: PurePath) -> None:
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"""
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Unlike mark(), this function accepts any paths.
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"""
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self.changed_files.add(path)
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def delete_file(self, path: PurePath) -> None:
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"""
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Unlike mark(), this function accepts any paths.
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"""
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self.deleted_files.add(path)
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