James R. Barlow
862861e3ca
If logging somehow triggers PageNumberFilter multiple times, it would fail on the second occurrence.
61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
# © 2020 James R. Barlow: github.com/jbarlow83
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#
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# This file is part of OCRmyPDF.
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#
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# OCRmyPDF is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# OCRmyPDF is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with OCRmyPDF. If not, see <http://www.gnu.org/licenses/>.
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import logging
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import sys
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from contextlib import suppress
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from tqdm import tqdm
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class PageNumberFilter(logging.Filter):
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def filter(self, record):
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pageno = getattr(record, 'pageno', None)
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if isinstance(pageno, int):
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record.pageno = f'{pageno:5d} '
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elif pageno is None:
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record.pageno = ''
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return True
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class TqdmConsole:
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"""Wrapper to log messages in a way that is compatible with tqdm progress bar
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This routes log messages through tqdm so that it can print them above the
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progress bar, and then refresh the progress bar, rather than overwriting
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it which looks messy.
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For some reason Python 3.6 prints extra empty messages from time to time,
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so we suppress those.
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"""
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def __init__(self, file):
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self.file = file
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self.py36 = sys.version_info[0:2] == (3, 6)
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def write(self, msg):
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# When no progress bar is active, tqdm.write() routes to print()
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if self.py36:
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if msg.strip() != '':
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tqdm.write(msg.rstrip(), end='\n', file=self.file)
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else:
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tqdm.write(msg.rstrip(), end='\n', file=self.file)
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def flush(self):
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with suppress(AttributeError):
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self.file.flush()
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