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92 lines
2.8 KiB
92 lines
2.8 KiB
# -*- coding: utf-8 -*-
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# Copyright 2020-2023 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""Compare versions of the same file and replace/enumerate them on mismatch"""
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from .common import PostProcessor
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from .. import text, util, exception
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import os
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class ComparePP(PostProcessor):
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def __init__(self, job, options):
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PostProcessor.__init__(self, job)
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if options.get("shallow"):
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self._compare = self._compare_size
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self._equal_exc = self._equal_cnt = 0
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equal = options.get("equal")
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if equal:
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equal, _, emax = equal.partition(":")
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self._equal_max = text.parse_int(emax)
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if equal == "abort":
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self._equal_exc = exception.StopExtraction
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elif equal == "terminate":
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self._equal_exc = exception.TerminateExtraction
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elif equal == "exit":
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self._equal_exc = SystemExit
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job.register_hooks({"file": (
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self.enumerate
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if options.get("action") == "enumerate" else
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self.replace
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)}, options)
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def replace(self, pathfmt):
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try:
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if self._compare(pathfmt.realpath, pathfmt.temppath):
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return self._equal(pathfmt)
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except OSError:
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pass
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self._equal_cnt = 0
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def enumerate(self, pathfmt):
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num = 1
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try:
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while not self._compare(pathfmt.realpath, pathfmt.temppath):
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pathfmt.prefix = prefix = format(num) + "."
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pathfmt.kwdict["extension"] = prefix + pathfmt.extension
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pathfmt.build_path()
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num += 1
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return self._equal(pathfmt)
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except OSError:
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pass
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self._equal_cnt = 0
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def _compare(self, f1, f2):
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return self._compare_size(f1, f2) and self._compare_content(f1, f2)
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@staticmethod
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def _compare_size(f1, f2):
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return os.stat(f1).st_size == os.stat(f2).st_size
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@staticmethod
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def _compare_content(f1, f2):
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size = 16384
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with open(f1, "rb") as fp1, open(f2, "rb") as fp2:
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while True:
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buf1 = fp1.read(size)
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buf2 = fp2.read(size)
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if buf1 != buf2:
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return False
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if not buf1:
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return True
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def _equal(self, pathfmt):
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if self._equal_exc:
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self._equal_cnt += 1
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if self._equal_cnt >= self._equal_max:
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util.remove_file(pathfmt.temppath)
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print()
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raise self._equal_exc()
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pathfmt.delete = True
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__postprocessor__ = ComparePP
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