def convert_item_to_command_line_arg(self, action, key, value):
"""Converts a config file or env var key + value to a list of
commandline args to append to the commandline.
Args:
action: The argparse Action object for this setting, or None if this
config file setting doesn't correspond to any defined
configargparse arg.
key: string (config file key or env var name)
value: parsed value of type string or list
"""
args = []
if action is None:
command_line_key = \
self.get_command_line_key_for_unknown_config_file_setting(key)
else:
command_line_key = action.option_strings[-1]
# handle boolean value
if action is not None and isinstance(action, ACTION_TYPES_THAT_DONT_NEED_A_VALUE):
if value.lower() in ("true", "yes"):
args.append( command_line_key )
elif value.lower() in ("false", "no"):
# don't append when set to "false" / "no"
pass
else:
self.error("Unexpected value for %s: '%s'. Expecting 'true', "
"'false', 'yes', or 'no'" % (key, value))
elif isinstance(value, list):
if action is None or isinstance(action, argparse._AppendAction):
for list_elem in value:
args.append( command_line_key )
args.append( str(list_elem) )
elif (isinstance(action, argparse._StoreAction) and action.nargs in ('+', '*')) or (
isinstance(action.nargs, int) and action.nargs > 1):
args.append( command_line_key )
for list_elem in value:
args.append( str(list_elem) )
else:
self.error(("%s can't be set to a list '%s' unless its action type is changed "
"to 'append' or nargs is set to '*', '+', or > 1") % (key, value))
elif isinstance(value, str):
args.append( command_line_key )
args.append( value )
else:
raise ValueError("Unexpected value type %s for value: %s" % (
type(value), value))
return args
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