James R. Barlow
11d74dea09
Really, this was just replicating the functionality of the PATH environment variable, and users probably do that anyway.
52 lines
1.7 KiB
Python
52 lines
1.7 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_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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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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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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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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