James R. Barlow
6756016572
Source files to GPL3 Exceptions: -tests/spoof/* to MIT -hocrtransform.py -_unicodefun.py Test resources to CC BY-SA 4.0 except when otherwise noted. Add GPL license.
64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
# © 2016 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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"""Wrappers to manage subprocess calls"""
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import os
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import re
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import sys
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from subprocess import run, STDOUT, PIPE, CalledProcessError
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from ..exceptions import MissingDependencyError
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def get_program(name):
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"Check environment variables for overrides to this program"
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envvar = 'OCRMYPDF_' + name.upper()
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return os.environ.get(envvar, name)
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def get_version(program, *,
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version_arg='--version', regex=r'(\d+(\.\d+)*)'):
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"Get the version of the specified program, "
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args_prog = [
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get_program(program),
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version_arg
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]
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try:
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proc = run(
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args_prog, close_fds=True, universal_newlines=True,
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stdout=PIPE, stderr=STDOUT, check=True)
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output = proc.stdout
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except CalledProcessError as e:
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if get_program(program) == program:
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raise MissingDependencyError(
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"Could not find program '{}' on the PATH".format(
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program)) from e
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else:
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raise MissingDependencyError(
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"Could not find program '{}'".format(
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get_program(program))) from e
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try:
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version = re.match(regex, output.strip()).group(1)
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except AttributeError as e:
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raise MissingDependencyError(
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("The program '{}' did not report its version. "
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"Message was:\n{}").format(program, output)
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)
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return version
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