Source code for plumbum.machines.env

# -*- coding: utf-8 -*-
import os
from contextlib import contextmanager


[docs]class EnvPathList(list): __slots__ = ["_path_factory", "_pathsep", "__weakref__"]
[docs] def __init__(self, path_factory, pathsep): self._path_factory = path_factory self._pathsep = pathsep
[docs] def append(self, path): list.append(self, self._path_factory(path))
[docs] def extend(self, paths): list.extend(self, (self._path_factory(p) for p in paths))
[docs] def insert(self, index, path): list.insert(self, index, self._path_factory(path))
[docs] def index(self, path): list.index(self, self._path_factory(path))
[docs] def __contains__(self, path): return list.__contains__(self, self._path_factory(path))
[docs] 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)
[docs]class BaseEnv(object): """The base class of LocalEnv and RemoteEnv""" __slots__ = ["_curr", "_path", "_path_factory", "__weakref__"] CASE_SENSITIVE = True
[docs] 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", ""))
[docs] @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()
[docs] def __iter__(self): """Returns an iterator over the items ``(key, value)`` of current environment (like dict.items)""" return iter(self._curr.items())
[docs] def __hash__(self): raise TypeError("unhashable type")
[docs] def __len__(self): """Returns the number of elements of the current environment""" return len(self._curr)
[docs] 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
[docs] 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()]
[docs] def keys(self): """Returns the keys of the current environment (like dict.keys)""" return self._curr.keys()
[docs] def items(self): """Returns the items of the current environment (like dict.items)""" return self._curr.items()
[docs] def values(self): """Returns the values of the current environment (like dict.values)""" return self._curr.values()
[docs] 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)
[docs] 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()
[docs] 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()
[docs] 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
[docs] def clear(self): """Clears the current environment (like dict.clear)""" self._curr.clear() self._update_path()
[docs] 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()
[docs] def getdict(self): """Returns the environment as a real dictionary""" self._curr["PATH"] = self.path.join() return {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: # pragma: no cover return self._path_factory(self["USERPROFILE"]) elif "HOMEPATH" in self: # pragma: no cover 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: # pragma: no cover self["USERPROFILE"] = str(p) elif "HOMEPATH" in self: # pragma: no cover self["HOMEPATH"] = str(p) else: # pragma: no cover 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"): # pragma: no branch if name in self: return self[name] try: # POSIX only import pwd except ImportError: return None else: return pwd.getpwuid(os.getuid())[0] # @UndefinedVariable