from __future__ import annotations from abc import ABC from collections import OrderedDict from pathlib import Path from virtualenv.info import IS_WIN class Describe: """Given a host interpreter tell us information about what the created interpreter might look like.""" suffix = ".exe" if IS_WIN else "" def __init__(self, dest, interpreter) -> None: self.interpreter = interpreter self.dest = dest self._stdlib = None self._stdlib_platform = None self._system_stdlib = None self._conf_vars = None @property def bin_dir(self): return self.script_dir @property def script_dir(self): return self.dest / self.interpreter.install_path("scripts") @property def purelib(self): return self.dest / self.interpreter.install_path("purelib") @property def platlib(self): return self.dest / self.interpreter.install_path("platlib") @property def libs(self): return list(OrderedDict(((self.platlib, None), (self.purelib, None))).keys()) @property def stdlib(self): if self._stdlib is None: self._stdlib = Path(self.interpreter.sysconfig_path("stdlib", config_var=self._config_vars)) return self._stdlib @property def stdlib_platform(self): if self._stdlib_platform is None: self._stdlib_platform = Path(self.interpreter.sysconfig_path("platstdlib", config_var=self._config_vars)) return self._stdlib_platform @property def _config_vars(self): if self._conf_vars is None: self._conf_vars = self._calc_config_vars(self.dest) return self._conf_vars def _calc_config_vars(self, to): sys_vars = self.interpreter.sysconfig_vars return {k: (to if v is not None and v.startswith(self.interpreter.prefix) else v) for k, v in sys_vars.items()} @classmethod def can_describe(cls, interpreter): # noqa: ARG003 """Knows means it knows how the output will look.""" return True @property def env_name(self): return self.dest.parts[-1] @property def exe(self): return self.bin_dir / f"{self.exe_stem()}{self.suffix}" @classmethod def exe_stem(cls): """Executable name without suffix - there seems to be no standard way to get this without creating it.""" raise NotImplementedError def script(self, name): return self.script_dir / f"{name}{self.suffix}" class Python3Supports(Describe, ABC): @classmethod def can_describe(cls, interpreter): return interpreter.version_info.major == 3 and super().can_describe(interpreter) # noqa: PLR2004 class PosixSupports(Describe, ABC): @classmethod def can_describe(cls, interpreter): return interpreter.os == "posix" and super().can_describe(interpreter) class WindowsSupports(Describe, ABC): @classmethod def can_describe(cls, interpreter): return interpreter.os == "nt" and super().can_describe(interpreter) __all__ = [ "Describe", "PosixSupports", "Python3Supports", "WindowsSupports", ]