/usr/share/pyshared/nwss/util.py is in python-nwsserver 2.0.0-2build1.
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# Copyright (c) 2005-2009, REvolution Computing, Inc.
#
# NetWorkSpaces is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
#
"""System-level utilities."""
import sys, os
import string #pylint: disable-msg=W0402
__all__ = ['which', 'msc_quote', 'msc_argv2str']
IS_WINDOWS = sys.platform.startswith('win')
WIN_EXTS = os.environ.get('PATHEXT', '').split(os.pathsep)
NEED_QUOTING = string.whitespace + '"'
def _isexec(path):
"""Check if a path refers to an executable file."""
return os.path.isfile(path) and os.access(path, os.X_OK)
def _exenames(name):
"""Generate the list of executable names to which ``name`` might refer."""
names = [name]
# only expand on Windows
if IS_WINDOWS:
# only expand if not extension is specified
base, ext = os.path.splitext(name)
if not ext:
for ext in WIN_EXTS:
names.append(base + ext)
return names
def which(cmd, path=None):
"""Find the command ``cmd`` in the path, similar to shell-builtin
'which'
"""
if os.path.split(cmd)[0]:
cmd = os.path.abspath(cmd)
# print "Checking for", cmd
matches = [x for x in _exenames(cmd) if _isexec(x)]
else:
matches = []
if not path:
path = os.environ.get('PATH', os.defpath).split(os.pathsep)
if IS_WINDOWS:
path.insert(0, os.curdir)
for pelem in path:
full = os.path.join(os.path.normpath(pelem), cmd)
# print "Checking for", full
matches += [x for x in _exenames(full) if _isexec(x)]
return matches
def msc_quote(cmd):
"""Quote a command-line argument as per MSC quoting rules. This is useful
in conjunction with os.spawnv on Windows. For example::
os.spawnv(os.P_WAIT, argv[0], [msc_quote(a) for a in argv])
This is only useful on Windows.
"""
if not [char for char in cmd if char in NEED_QUOTING]:
return cmd
quoted = '"'
nbs = 0
for char in cmd:
if char == '\\':
quoted += char
nbs += 1
elif char == '"':
quoted += (nbs + 1) * '\\' + char
nbs = 0
else:
quoted += char
nbs = 0
quoted += nbs * '\\' + '"'
return quoted
def msc_argv2str(argv):
"""Quote a command-line as per MSC quoting rules. This is useful in
conjunction with win32process.CreateProcess and os.system on Windows. For
example::
os.system(msc_argv2str(argv))
This is only useful on Windows.
"""
return ' '.join([msc_quote(arg) for arg in argv])
if __name__ == '__main__':
def _qtest(argv):
"""Simple test for msc_argv2str quoting."""
print "quoted command string:", msc_argv2str(argv)
def _wtest(argv):
"""Simple test for ``which`` functionality."""
for arg in argv[1:]:
plist = which(arg)
if not plist:
print >> sys.stderr, \
"error: no matches found for", arg
continue
if len(plist) > 1:
print >> sys.stderr, \
"warning: more than one match found for", arg
print plist[0]
_qtest(sys.argv)
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