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from __future__ import absolute_import, unicode_literals
from argparse import SUPPRESS, ArgumentDefaultsHelpFormatter, ArgumentParser
from ..env_var import get_env_var
from ..ini import IniConfig
class VirtualEnvConfigParser(ArgumentParser):
"""
Custom option parser which updates its defaults by checking the configuration files and environmental variables
"""
def __init__(self, options=None, *args, **kwargs):
self.file_config = IniConfig()
self.epilog_list = []
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()
self._elements = None
self._verbosity = None
self._options = options
self._interpreter = 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 = type(action.default)
outcome = get_env_var(action.dest, as_type)
if outcome is None and self.file_config:
outcome = self.file_config.get(action.dest, as_type)
if outcome is not None:
action.default, action.default_source = 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):
self._fix_defaults()
return super(VirtualEnvConfigParser, self).parse_known_args(args, namespace=namespace)
def parse_args(self, args=None, namespace=None):
self._fix_defaults()
return super(VirtualEnvConfigParser, self).parse_args(args, namespace=namespace)
class HelpFormatter(ArgumentDefaultsHelpFormatter):
def __init__(self, prog):
super(HelpFormatter, self).__init__(prog, max_help_position=35, 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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