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import os
from contextlib import contextmanager
class EnvPathList(list):
__slots__ = ["_path_factory", "_pathsep"]
def __init__(self, path_factory, pathsep):
self._path_factory = path_factory
self._pathsep = pathsep
def append(self, path):
list.append(self, self._path_factory(path))
def extend(self, paths):
list.extend(self, (self._path_factory(p) for p in paths))
def insert(self, index, path):
list.insert(self, index, self._path_factory(path))
def index(self, path):
list.index(self, self._path_factory(path))
def __contains__(self, path):
return list.__contains__(self, self._path_factory(path))
def remove(self, path):
list.remove(self, self._path_factory(path))
def update(self, text):
self[:] = [self._path_factory(p) for p in text.split(self._pathsep)]
def join(self):
return self._pathsep.join(str(p) for p in self)
class BaseEnv(object):
"""The base class of LocalEnv and RemoteEnv"""
__slots__ = ["_curr", "_path", "_path_factory"]
CASE_SENSITIVE = True
def __init__(self, path_factory, pathsep):
self._path_factory = path_factory
self._path = EnvPathList(path_factory, pathsep)
self._update_path()
def _update_path(self):
self._path.update(self.get("PATH", ""))
@contextmanager
def __call__(self, *args, **kwargs):
"""A context manager that can be used for temporal modifications of the environment.
Any time you enter the context, a copy of the old environment is stored, and then restored,
when the context exits.
:param args: Any positional arguments for ``update()``
:param kwargs: Any keyword arguments for ``update()``
"""
prev = self._curr.copy()
self.update(**kwargs)
try:
yield
finally:
self._curr = prev
self._update_path()
def __iter__(self):
"""Returns an iterator over the items ``(key, value)`` of current environment
(like dict.items)"""
return iter(self._curr.items())
def __hash__(self):
raise TypeError("unhashable type")
def __len__(self):
"""Returns the number of elements of the current environment"""
return len(self._curr)
def __contains__(self, name):
"""Tests whether an environment variable exists in the current environment"""
return (name if self.CASE_SENSITIVE else name.upper()) in self._curr
def __getitem__(self, name):
"""Returns the value of the given environment variable from current environment,
raising a ``KeyError`` if it does not exist"""
return self._curr[name if self.CASE_SENSITIVE else name.upper()]
def keys(self):
"""Returns the keys of the current environment (like dict.keys)"""
return self._curr.keys()
def items(self):
"""Returns the items of the current environment (like dict.items)"""
return self._curr.items()
def values(self):
"""Returns the values of the current environment (like dict.values)"""
return self._curr.values()
def get(self, name, *default):
"""Returns the keys of the current environment (like dict.keys)"""
return self._curr.get((name if self.CASE_SENSITIVE else name.upper()), *default)
def __delitem__(self, name):
"""Deletes an environment variable from the current environment"""
name = name if self.CASE_SENSITIVE else name.upper()
del self._curr[name]
if name == "PATH":
self._update_path()
def __setitem__(self, name, value):
"""Sets/replaces an environment variable's value in the current environment"""
name = name if self.CASE_SENSITIVE else name.upper()
self._curr[name] = value
if name == "PATH":
self._update_path()
def pop(self, name, *default):
"""Pops an element from the current environment (like dict.pop)"""
name = name if self.CASE_SENSITIVE else name.upper()
res = self._curr.pop(name, *default)
if name == "PATH":
self._update_path()
return res
def clear(self):
"""Clears the current environment (like dict.clear)"""
self._curr.clear()
self._update_path()
def update(self, *args, **kwargs):
"""Updates the current environment (like dict.update)"""
self._curr.update(*args, **kwargs)
if not self.CASE_SENSITIVE:
for k, v in list(self._curr.items()):
self._curr[k.upper()] = v
self._update_path()
def getdict(self):
"""Returns the environment as a real dictionary"""
self._curr["PATH"] = self.path.join()
return dict((k, str(v)) for k, v in self._curr.items())
@property
def path(self):
"""The system's ``PATH`` (as an easy-to-manipulate list)"""
return self._path
def _get_home(self):
if "HOME" in self:
return self._path_factory(self["HOME"])
elif "USERPROFILE" in self:
return self._path_factory(self["USERPROFILE"])
elif "HOMEPATH" in self:
return self._path_factory(self.get("HOMEDRIVE", ""), self["HOMEPATH"])
return None
def _set_home(self, p):
if "HOME" in self:
self["HOME"] = str(p)
elif "USERPROFILE" in self:
self["USERPROFILE"] = str(p)
elif "HOMEPATH" in self:
self["HOMEPATH"] = str(p)
else:
self["HOME"] = str(p)
home = property(_get_home, _set_home)
"""Get or set the home path"""
@property
def user(self):
"""Return the user name, or ``None`` if it is not set"""
# adapted from getpass.getuser()
for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
if name in self:
return self[name]
try:
# POSIX only
import pwd
except ImportError:
return None
else:
return pwd.getpwuid(os.getuid())[0] # @UndefinedVariable
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