Current File : //opt/alt/python37/lib/python3.7/site-packages/virtualenv/config/cli/parser.py
from __future__ import absolute_import, unicode_literals
import os
from argparse import SUPPRESS, ArgumentDefaultsHelpFormatter, ArgumentParser, Namespace
from collections import OrderedDict
from virtualenv.config.convert import get_type
from ..env_var import get_env_var
from ..ini import IniConfig
class VirtualEnvOptions(Namespace):
def __init__(self, **kwargs):
super(VirtualEnvOptions, self).__init__(**kwargs)
self._src = None
self._sources = {}
def set_src(self, key, value, src):
setattr(self, key, value)
if src.startswith("env var"):
src = "env var"
self._sources[key] = src
def __setattr__(self, key, value):
if getattr(self, "_src", None) is not None:
self._sources[key] = self._src
super(VirtualEnvOptions, self).__setattr__(key, value)
def get_source(self, key):
return self._sources.get(key)
@property
def verbosity(self):
if not hasattr(self, "verbose") and not hasattr(self, "quiet"):
return None
return max(self.verbose - self.quiet, 0)
def __repr__(self):
return "{}({})".format(
type(self).__name__,
", ".join("{}={}".format(k, v) for k, v in vars(self).items() if not k.startswith("_")),
)
class VirtualEnvConfigParser(ArgumentParser):
"""
Custom option parser which updates its defaults by checking the configuration files and environmental variables
"""
def __init__(self, options=None, env=None, *args, **kwargs):
env = os.environ if env is None else env
self.file_config = IniConfig(env)
self.epilog_list = []
self.env = env
kwargs["epilog"] = self.file_config.epilog
kwargs["add_help"] = False
kwargs["formatter_class"] = HelpFormatter
kwargs["prog"] = "virtualenv"
super(VirtualEnvConfigParser, self).__init__(*args, **kwargs)
self._fixed = set()
if options is not None and not isinstance(options, VirtualEnvOptions):
raise TypeError("options must be of type VirtualEnvOptions")
self.options = VirtualEnvOptions() if options is None else options
self._interpreter = None
self._app_data = None
def _fix_defaults(self):
for action in self._actions:
action_id = id(action)
if action_id not in self._fixed:
self._fix_default(action)
self._fixed.add(action_id)
def _fix_default(self, action):
if hasattr(action, "default") and hasattr(action, "dest") and action.default != SUPPRESS:
as_type = get_type(action)
names = OrderedDict((i.lstrip("-").replace("-", "_"), None) for i in action.option_strings)
outcome = None
for name in names:
outcome = get_env_var(name, as_type, self.env)
if outcome is not None:
break
if outcome is None and self.file_config:
for name in names:
outcome = self.file_config.get(name, as_type)
if outcome is not None:
break
if outcome is not None:
action.default, action.default_source = outcome
else:
outcome = action.default, "default"
self.options.set_src(action.dest, *outcome)
def enable_help(self):
self._fix_defaults()
self.add_argument("-h", "--help", action="help", default=SUPPRESS, help="show this help message and exit")
def parse_known_args(self, args=None, namespace=None):
if namespace is None:
namespace = self.options
elif namespace is not self.options:
raise ValueError("can only pass in parser.options")
self._fix_defaults()
self.options._src = "cli"
try:
namespace.env = self.env
return super(VirtualEnvConfigParser, self).parse_known_args(args, namespace=namespace)
finally:
self.options._src = None
class HelpFormatter(ArgumentDefaultsHelpFormatter):
def __init__(self, prog):
super(HelpFormatter, self).__init__(prog, max_help_position=32, width=240)
def _get_help_string(self, action):
# noinspection PyProtectedMember
text = super(HelpFormatter, self)._get_help_string(action)
if hasattr(action, "default_source"):
default = " (default: %(default)s)"
if text.endswith(default):
text = "{} (default: %(default)s -> from %(default_source)s)".format(text[: -len(default)])
return text
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