code: def setup_parserarg_for_interface(
      parser,
      param_name,
      param,
      defaults_idx,
      prefix_chars,
      defaults,
      completing=False,
  ):
      cmd_args = param.cmd_args
      parser_kwargs = param.cmd_kwargs
      has_default = defaults_idx >= 0
      if cmd_args:
          if cmd_args[0][0] in prefix_chars:
              # TODO: All the Parameter(args=...) values in this code
              # base use hyphens, so there is no point in the below
              # conversion. If it looks like no extensions rely on this
              # behavior either, this could be dropped.
              parser_args = [c.replace("_", "-") for c in cmd_args]
          else:
              # Argparse will not convert dashes to underscores for
              # arguments that don't start with a prefix character, so
              # the above substitution must be avoided so that
              # call_from_parser() can find the corresponding parameter.
              parser_args = cmd_args
      elif has_default:
          # Construct the option from the Python parameter name.
          parser_args = ("--{}".format(param_name.replace("_", "-")),)
      else:
          # If args= wasn't given and its a positional argument in the
          # function, add a positional argument to argparse. If `dest` is
          # specified, we need to remove it from the keyword arguments
          # because add_argument() expects it as the first argument. Note
          # that `arg` shouldn't have a dash here, but `metavar` can be
          # used if a dash is preferred for the command-line help.
          parser_args = (parser_kwargs.pop("dest", param_name),)
  
      if has_default:
          parser_kwargs["default"] = defaults[defaults_idx]
      if param.constraints is not None:
          parser_kwargs["type"] = param.constraints
      if completing:
          help = None
          # if possible, define choices to enable their completion
          if "choices" not in parser_kwargs and isinstance(
              param.constraints, EnsureChoice
          ):
              parser_kwargs["choices"] = [
                  c for c in param.constraints._allowed if c is not None
              ]
      else:
          help = _amend_param_parser_kwargs_for_help(
              parser_kwargs,
              param,
              defaults[defaults_idx] if defaults_idx >= 0 else None,
          )
      # create the parameter, using the constraint instance for type
      # conversion
      parser.add_argument(*parser_args, help=help, **parser_kwargs)
  
imports: import argparse
  import logging
  import sys
  from collections import defaultdict
  from functools import partial
  from datalad import __version__
  from datalad.interface.base import get_cmd_doc, get_interface_groups, is_api_arg, load_interface
  from datalad.support.constraints import EnsureChoice
  from datalad.utils import getargspec
  from .common_args import common_args
  from .exec import call_from_parser
  from .helpers import get_commands_from_groups
  from .interface import alter_interface_docs_for_cmdline, get_cmd_ex, get_cmdline_command_name
label_desc: Use image node_id 3 for calling a global function with example usage: setup_parserarg_for_interface(parser, param_name, param, defaults_idx, prefix_chars, defaults, completing) without return types