116 lines
4.4 KiB
Python
116 lines
4.4 KiB
Python
"""Compatibility wrappers for Py2/Py3."""
|
|
|
|
import sys
|
|
import os
|
|
|
|
if sys.version_info[0] < 3:
|
|
from UserDict import UserDict, IterableUserDict
|
|
from urllib import quote
|
|
from urllib import quote_plus
|
|
from urllib import unquote as urllib_unquote
|
|
from urllib import urlopen
|
|
from urlparse import urlparse
|
|
from collections import MutableMapping
|
|
|
|
def unquote(uri):
|
|
"""Specialized unquote that uses UTF-8 for parsing."""
|
|
uri = uri.encode('ascii')
|
|
unquoted = urllib_unquote(uri)
|
|
return unquoted.decode('utf-8')
|
|
|
|
# Old-style of re-raising an exception is SyntaxError in Python 3,
|
|
# so hide behind exec() so the Python 3 parser doesn't see it
|
|
exec('''def reraise(exc_type, exc_value, exc_traceback):
|
|
"""Re-raise an exception given information from sys.exc_info()
|
|
|
|
Note that unlike six.reraise, this does not support replacing the
|
|
traceback. All arguments must come from a single sys.exc_info() call.
|
|
"""
|
|
raise exc_type, exc_value, exc_traceback
|
|
''')
|
|
|
|
else:
|
|
from collections import UserDict
|
|
IterableUserDict = UserDict
|
|
from urllib.parse import quote, quote_plus, unquote, urlparse
|
|
from urllib.request import urlopen
|
|
from collections.abc import MutableMapping
|
|
|
|
def reraise(exc_type, exc_value, exc_traceback):
|
|
"""Re-raise an exception given information from sys.exc_info()
|
|
|
|
Note that unlike six.reraise, this does not support replacing the
|
|
traceback. All arguments must come from a single sys.exc_info() call.
|
|
"""
|
|
# In Python 3, all exception info is contained in one object.
|
|
raise exc_value
|
|
|
|
try:
|
|
from shutil import which
|
|
except ImportError:
|
|
# shutil.which() from Python 3.6
|
|
# "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
|
|
# 2011, 2012, 2013, 2014, 2015, 2016, 2017 Python Software Foundation;
|
|
# All Rights Reserved"
|
|
def which(cmd, mode=os.F_OK | os.X_OK, path=None):
|
|
"""Given a command, mode, and a PATH string, return the path which
|
|
conforms to the given mode on the PATH, or None if there is no such
|
|
file.
|
|
|
|
`mode` defaults to os.F_OK | os.X_OK. `path` defaults to the result
|
|
of os.environ.get("PATH"), or can be overridden with a custom search
|
|
path.
|
|
|
|
"""
|
|
# Check that a given file can be accessed with the correct mode.
|
|
# Additionally check that `file` is not a directory, as on Windows
|
|
# directories pass the os.access check.
|
|
def _access_check(fn, mode):
|
|
return (os.path.exists(fn) and os.access(fn, mode)
|
|
and not os.path.isdir(fn))
|
|
|
|
# If we're given a path with a directory part, look it up directly rather
|
|
# than referring to PATH directories. This includes checking relative to the
|
|
# current directory, e.g. ./script
|
|
if os.path.dirname(cmd):
|
|
if _access_check(cmd, mode):
|
|
return cmd
|
|
return None
|
|
|
|
if path is None:
|
|
path = os.environ.get("PATH", os.defpath)
|
|
if not path:
|
|
return None
|
|
path = path.split(os.pathsep)
|
|
|
|
if sys.platform == "win32":
|
|
# The current directory takes precedence on Windows.
|
|
if not os.curdir in path:
|
|
path.insert(0, os.curdir)
|
|
|
|
# PATHEXT is necessary to check on Windows.
|
|
pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
|
|
# See if the given file matches any of the expected path extensions.
|
|
# This will allow us to short circuit when given "python.exe".
|
|
# If it does match, only test that one, otherwise we have to try
|
|
# others.
|
|
if any(cmd.lower().endswith(ext.lower()) for ext in pathext):
|
|
files = [cmd]
|
|
else:
|
|
files = [cmd + ext for ext in pathext]
|
|
else:
|
|
# On other platforms you don't have things like PATHEXT to tell you
|
|
# what file suffixes are executable, so just pass on cmd as-is.
|
|
files = [cmd]
|
|
|
|
seen = set()
|
|
for dir in path:
|
|
normdir = os.path.normcase(dir)
|
|
if not normdir in seen:
|
|
seen.add(normdir)
|
|
for thefile in files:
|
|
name = os.path.join(dir, thefile)
|
|
if _access_check(name, mode):
|
|
return name
|
|
return None
|