#!/usr/bin/env python
# ###########################################################################
#
# This file is part of Taurus
#
# http://taurus-scada.org
#
# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
#
# Taurus is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Taurus is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Taurus. If not, see <http://www.gnu.org/licenses/>.
#
# ###########################################################################
"""Find path of executable specified by filename
"""
__all__ = ["whichfile"]
__docformat__ = "restructuredtext"
import os
[docs]def whichfile(filename, exts=None):
"""Find path of executable specified by filename.
It Takes into consideration
the PATHEXT variable (found in MS Windows systems) to try also executable
names extended with executable extensions.
Example::
# on a debian machine with taurus installed in the default path:
whichfile('taurus') --> '/usr/bin/taurus'
# or, on a winXP machine:
whichfile('command') --> 'C:\\WINDOWS\\system32\\command.COM'
:param filename: executable name.
:type filename: str
:param exts: a list of valid executable extensions. If None given, the
PATHEXT environmental variable is used if available.
:type exts: list<str>
:return: absolute path to the executable in the file system
:rtype: str
"""
path = os.getenv("PATH", "").split(os.path.pathsep)
if exts is None:
exts = os.getenv("PATHEXT", "").split(os.path.pathsep)
if "" not in exts:
exts.insert(0, "")
for p in path:
p = os.path.join(p, filename)
for e in exts:
pext = p + e
if os.access(pext, os.X_OK):
return pext
return None