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# This file must be used with "source bin/activate.xsh" *from xonsh*. # You cannot run it directly. class _VirtualEnvActivator: """xonsh activation for virtualenv. Rendered into ``<venv>/bin/activate.xsh`` by the template in ``src/virtualenv/activation/xonsh/`` at generate-time. - Project: https://github.com/pypa/virtualenv - Template source: https://github.com/pypa/virtualenv/tree/main/src/virtualenv/activation/xonsh """ # Stashed in _OLD_VIRTUAL_{name} when the variable was not set before # activation. deactivate treats this as "unset" rather than "restore to # this string". Chosen to be vanishingly unlikely as a real value. _UNSET_SENTINEL = "__virtualenv_was_not_set__" def __init__(self): self.env = __xonsh__.env try: # Values substituted by virtualenv's XonshActivator at generate-time. # If this file was sourced before template rendering, the bare # identifiers below resolve to NameError. self.embedded_virtual_env = __VIRTUAL_ENV__ self.embedded_virtual_prompt = __VIRTUAL_PROMPT__ self.embedded_bin_name = __BIN_NAME__ self.embedded_tcl_library = __TCL_LIBRARY__ self.embedded_tk_library = __TK_LIBRARY__ except NameError: print("virtualenv activate.xsh: template was not rendered") raise # Variables this activator may save+override; deactivate walks this list. self.managed_vars = ("PATH", "PYTHONHOME", "TCL_LIBRARY", "TK_LIBRARY") def _backup_name(self, name): return f"_OLD_VIRTUAL_{name}" def _save(self, name): """Stash the current value (or sentinel if unset) so deactivate can undo.""" backup = self._backup_name(name) self.env[backup] = self.env[name] if name in self.env else self._UNSET_SENTINEL def _override(self, name, value): self._save(name) self.env[name] = value def _drop(self, name): self._save(name) self.env.pop(name, None) def register_pydoc(self): aliases["pydoc"] = ["python", "-m", "pydoc"] def unregister_pydoc(self): aliases.pop("pydoc", None) def activate(self): from os.path import join, basename aliases["deactivate"] = self.deactivate self.deactivate(["nondestructive"]) # wipe any stale state from a prior activation $VIRTUAL_ENV = self.embedded_virtual_env $VIRTUAL_ENV_PROMPT = self.embedded_virtual_prompt or basename($VIRTUAL_ENV) self._override("PATH", [join($VIRTUAL_ENV, self.embedded_bin_name), *$PATH]) self._drop("PYTHONHOME") for name, value in (("TCL_LIBRARY", self.embedded_tcl_library), ("TK_LIBRARY", self.embedded_tk_library)): if value: self._override(name, value) self.register_pydoc() def deactivate(self, args=None): for name in self.managed_vars: backup = self._backup_name(name) if backup not in self.env: continue previous = self.env[backup] del self.env[backup] if previous == self._UNSET_SENTINEL: self.env.pop(name, None) else: self.env[name] = previous for name in ("VIRTUAL_ENV", "VIRTUAL_ENV_PROMPT"): self.env.pop(name, None) self.unregister_pydoc() if args is None or "nondestructive" not in args: del aliases["deactivate"] try: del __xonsh__.xontrib.virtualenv except AttributeError: pass if not hasattr(__xonsh__, "xontrib"): __xonsh__.xontrib = __xonsh__.imp.types.SimpleNamespace() __xonsh__.xontrib.virtualenv = _VirtualEnvActivator() __xonsh__.xontrib.virtualenv.activate()
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