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import argparse
import shlex
import sys
from copy import deepcopy
from ..config import Configuration
from ..setting import BooleanSetting, ChoiceSetting, ListSetting
from .base import Source
__all__ = (
'CommandLineSource',
)
# pylint: disable=R0201
class CommandLineSource(Source):
# pylint: disable=R0913
def __init__(
self,
arguments=None,
options=None,
version=None,
parser_options=None,
positional=None):
super(CommandLineSource, self).__init__()
if arguments is None:
self.arguments = sys.argv[1:]
elif isinstance(arguments, basestring):
self.arguments = shlex.split(arguments)
elif isinstance(arguments, (list, tuple)):
self.arguments = arguments
else:
raise TypeError('arguments must be a string or list of strings')
self.version = version
self.options = options or {}
self.parser_options = parser_options or {}
self.positional = positional or ()
def get_flags(self, setting):
if setting.name in self.options:
if 'flags' in self.options[setting.name]:
return self.options[setting.name]['flags']
flags = []
flag = '--%s' % setting.name.lower().replace('_', '-')
flags.append(flag)
return flags
def get_action(self, setting):
if isinstance(setting, BooleanSetting):
return 'store_false' if setting.default else 'store_true'
elif isinstance(setting, ListSetting):
return 'append'
else:
return 'store'
# pylint: disable=W0613
def get_default(self, setting):
# Caveat: Returning something other than SUPPRESS probably won't
# work the way you'd think.
return argparse.SUPPRESS
def get_type(self, setting):
if isinstance(setting, (ListSetting, BooleanSetting)):
return None
elif isinstance(setting, ChoiceSetting):
return setting.subtype.sanitize
else:
return setting.sanitize
def get_dest(self, setting):
return setting.name
def get_choices(self, setting):
if isinstance(setting, ChoiceSetting):
return setting.choices
else:
return None
def get_help(self, setting):
if setting.name in self.options:
if 'help' in self.options[setting.name]:
return self.options[setting.name]['help']
return None
def get_metavar(self, setting):
if setting.name in self.options:
if 'metavar' in self.options[setting.name]:
return self.options[setting.name]['metavar']
return None
def build_argument(self, setting):
flags = self.get_flags(setting)
action = self.get_action(setting)
default = self.get_default(setting)
argtype = self.get_type(setting)
dest = self.get_dest(setting)
choices = self.get_choices(setting)
arghelp = self.get_help(setting)
metavar = self.get_metavar(setting)
argument_kwargs = {
'action': action,
'default': default,
'dest': dest,
'help': arghelp,
}
if argtype:
argument_kwargs['type'] = argtype
if choices:
argument_kwargs['choices'] = choices
if metavar:
argument_kwargs['metavar'] = metavar
return flags, argument_kwargs
def build_parser(self, settings, manager):
parser_options = deepcopy(self.parser_options)
if not parser_options.get('prog') and manager:
parser_options['prog'] = manager.name
parser = argparse.ArgumentParser(**parser_options)
add_version = (self.version is not None)
for setting in settings:
flags, argument_kwargs = self.build_argument(setting)
parser.add_argument(*flags, **argument_kwargs)
if add_version and setting.name == 'version':
# Don't want to conflict with the desired setting
add_version = False
if add_version:
parser.add_argument(
'--version',
action='version',
version='%(prog)s ' + self.version,
)
if self.positional:
for name, options in self.positional:
parser.add_argument(name, **options)
return parser
def get_config(self, settings, manager=None, parent=None):
parser = self.build_parser(settings, manager)
parsed = parser.parse_args(self.arguments)
for setting in settings:
if hasattr(parsed, setting.name):
setting.value = getattr(parsed, setting.name)
if self.positional and manager:
arguments = {}
for name, _ in self.positional:
if hasattr(parsed, name):
arguments[name] = getattr(parsed, name)
setattr(manager, 'arguments', arguments)
return Configuration(settings=settings, parent=parent)