"""Command-line interface settings source.""" from __future__ import annotations as _annotations import json import re import shlex import sys import typing from argparse import ( SUPPRESS, ArgumentParser, BooleanOptionalAction, Namespace, RawDescriptionHelpFormatter, _SubParsersAction, ) from collections import defaultdict from collections.abc import Mapping, Sequence from enum import Enum from textwrap import dedent from types import SimpleNamespace from typing import ( TYPE_CHECKING, Annotated, Any, Callable, Generic, NoReturn, Optional, TypeVar, Union, cast, overload, ) import typing_extensions from pydantic import BaseModel, Field from pydantic._internal._repr import Representation from pydantic._internal._utils import is_model_class from pydantic.dataclasses import is_pydantic_dataclass from pydantic.fields import FieldInfo from pydantic_core import PydanticUndefined from typing_extensions import get_args, get_origin from typing_inspection import typing_objects from typing_inspection.introspection import is_union_origin from ...exceptions import SettingsError from ...utils import _lenient_issubclass, _WithArgsTypes from ..types import NoDecode, _CliExplicitFlag, _CliImplicitFlag, _CliPositionalArg, _CliSubCommand, _CliUnknownArgs from ..utils import ( _annotation_contains_types, _annotation_enum_val_to_name, _get_alias_names, _get_model_fields, _is_function, _strip_annotated, parse_env_vars, ) from .env import EnvSettingsSource if TYPE_CHECKING: from pydantic_settings.main import BaseSettings class _CliInternalArgParser(ArgumentParser): def __init__(self, cli_exit_on_error: bool = True, **kwargs: Any) -> None: super().__init__(**kwargs) self._cli_exit_on_error = cli_exit_on_error def error(self, message: str) -> NoReturn: if not self._cli_exit_on_error: raise SettingsError(f'error parsing CLI: {message}') super().error(message) class CliMutuallyExclusiveGroup(BaseModel): pass T = TypeVar('T') CliSubCommand = Annotated[Union[T, None], _CliSubCommand] CliPositionalArg = Annotated[T, _CliPositionalArg] _CliBoolFlag = TypeVar('_CliBoolFlag', bound=bool) CliImplicitFlag = Annotated[_CliBoolFlag, _CliImplicitFlag] CliExplicitFlag = Annotated[_CliBoolFlag, _CliExplicitFlag] CLI_SUPPRESS = SUPPRESS CliSuppress = Annotated[T, CLI_SUPPRESS] CliUnknownArgs = Annotated[list[str], Field(default=[]), _CliUnknownArgs, NoDecode] class CliSettingsSource(EnvSettingsSource, Generic[T]): """ Source class for loading settings values from CLI. Note: A `CliSettingsSource` connects with a `root_parser` object by using the parser methods to add `settings_cls` fields as command line arguments. The `CliSettingsSource` internal parser representation is based upon the `argparse` parsing library, and therefore, requires the parser methods to support the same attributes as their `argparse` library counterparts. Args: cli_prog_name: The CLI program name to display in help text. Defaults to `None` if cli_parse_args is `None`. Otherwise, defaults to sys.argv[0]. cli_parse_args: The list of CLI arguments to parse. Defaults to None. If set to `True`, defaults to sys.argv[1:]. cli_parse_none_str: The CLI string value that should be parsed (e.g. "null", "void", "None", etc.) into `None` type(None). Defaults to "null" if cli_avoid_json is `False`, and "None" if cli_avoid_json is `True`. cli_hide_none_type: Hide `None` values in CLI help text. Defaults to `False`. cli_avoid_json: Avoid complex JSON objects in CLI help text. Defaults to `False`. cli_enforce_required: Enforce required fields at the CLI. Defaults to `False`. cli_use_class_docs_for_groups: Use class docstrings in CLI group help text instead of field descriptions. Defaults to `False`. cli_exit_on_error: Determines whether or not the internal parser exits with error info when an error occurs. Defaults to `True`. cli_prefix: Prefix for command line arguments added under the root parser. Defaults to "". cli_flag_prefix_char: The flag prefix character to use for CLI optional arguments. Defaults to '-'. cli_implicit_flags: Whether `bool` fields should be implicitly converted into CLI boolean flags. (e.g. --flag, --no-flag). Defaults to `False`. cli_ignore_unknown_args: Whether to ignore unknown CLI args and parse only known ones. Defaults to `False`. cli_kebab_case: CLI args use kebab case. Defaults to `False`. case_sensitive: Whether CLI "--arg" names should be read with case-sensitivity. Defaults to `True`. Note: Case-insensitive matching is only supported on the internal root parser and does not apply to CLI subcommands. root_parser: The root parser object. parse_args_method: The root parser parse args method. Defaults to `argparse.ArgumentParser.parse_args`. add_argument_method: The root parser add argument method. Defaults to `argparse.ArgumentParser.add_argument`. add_argument_group_method: The root parser add argument group method. Defaults to `argparse.ArgumentParser.add_argument_group`. add_parser_method: The root parser add new parser (sub-command) method. Defaults to `argparse._SubParsersAction.add_parser`. add_subparsers_method: The root parser add subparsers (sub-commands) method. Defaults to `argparse.ArgumentParser.add_subparsers`. formatter_class: A class for customizing the root parser help text. Defaults to `argparse.RawDescriptionHelpFormatter`. """ def __init__( self, settings_cls: type[BaseSettings], cli_prog_name: str | None = None, cli_parse_args: bool | list[str] | tuple[str, ...] | None = None, cli_parse_none_str: str | None = None, cli_hide_none_type: bool | None = None, cli_avoid_json: bool | None = None, cli_enforce_required: bool | None = None, cli_use_class_docs_for_groups: bool | None = None, cli_exit_on_error: bool | None = None, cli_prefix: str | None = None, cli_flag_prefix_char: str | None = None, cli_implicit_flags: bool | None = None, cli_ignore_unknown_args: bool | None = None, cli_kebab_case: bool | None = None, case_sensitive: bool | None = True, root_parser: Any = None, parse_args_method: Callable[..., Any] | None = None, add_argument_method: Callable[..., Any] | None = ArgumentParser.add_argument, add_argument_group_method: Callable[..., Any] | None = ArgumentParser.add_argument_group, add_parser_method: Callable[..., Any] | None = _SubParsersAction.add_parser, add_subparsers_method: Callable[..., Any] | None = ArgumentParser.add_subparsers, formatter_class: Any = RawDescriptionHelpFormatter, ) -> None: self.cli_prog_name = ( cli_prog_name if cli_prog_name is not None else settings_cls.model_config.get('cli_prog_name', sys.argv[0]) ) self.cli_hide_none_type = ( cli_hide_none_type if cli_hide_none_type is not None else settings_cls.model_config.get('cli_hide_none_type', False) ) self.cli_avoid_json = ( cli_avoid_json if cli_avoid_json is not None else settings_cls.model_config.get('cli_avoid_json', False) ) if not cli_parse_none_str: cli_parse_none_str = 'None' if self.cli_avoid_json is True else 'null' self.cli_parse_none_str = cli_parse_none_str self.cli_enforce_required = ( cli_enforce_required if cli_enforce_required is not None else settings_cls.model_config.get('cli_enforce_required', False) ) self.cli_use_class_docs_for_groups = ( cli_use_class_docs_for_groups if cli_use_class_docs_for_groups is not None else settings_cls.model_config.get('cli_use_class_docs_for_groups', False) ) self.cli_exit_on_error = ( cli_exit_on_error if cli_exit_on_error is not None else settings_cls.model_config.get('cli_exit_on_error', True) ) self.cli_prefix = cli_prefix if cli_prefix is not None else settings_cls.model_config.get('cli_prefix', '') self.cli_flag_prefix_char = ( cli_flag_prefix_char if cli_flag_prefix_char is not None else settings_cls.model_config.get('cli_flag_prefix_char', '-') ) self._cli_flag_prefix = self.cli_flag_prefix_char * 2 if self.cli_prefix: if cli_prefix.startswith('.') or cli_prefix.endswith('.') or not cli_prefix.replace('.', '').isidentifier(): # type: ignore raise SettingsError(f'CLI settings source prefix is invalid: {cli_prefix}') self.cli_prefix += '.' self.cli_implicit_flags = ( cli_implicit_flags if cli_implicit_flags is not None else settings_cls.model_config.get('cli_implicit_flags', False) ) self.cli_ignore_unknown_args = ( cli_ignore_unknown_args if cli_ignore_unknown_args is not None else settings_cls.model_config.get('cli_ignore_unknown_args', False) ) self.cli_kebab_case = ( cli_kebab_case if cli_kebab_case is not None else settings_cls.model_config.get('cli_kebab_case', False) ) case_sensitive = case_sensitive if case_sensitive is not None else True if not case_sensitive and root_parser is not None: raise SettingsError('Case-insensitive matching is only supported on the internal root parser') super().__init__( settings_cls, env_nested_delimiter='.', env_parse_none_str=self.cli_parse_none_str, env_parse_enums=True, env_prefix=self.cli_prefix, case_sensitive=case_sensitive, ) root_parser = ( _CliInternalArgParser( cli_exit_on_error=self.cli_exit_on_error, prog=self.cli_prog_name, description=None if settings_cls.__doc__ is None else dedent(settings_cls.__doc__), formatter_class=formatter_class, prefix_chars=self.cli_flag_prefix_char, allow_abbrev=False, ) if root_parser is None else root_parser ) self._connect_root_parser( root_parser=root_parser, parse_args_method=parse_args_method, add_argument_method=add_argument_method, add_argument_group_method=add_argument_group_method, add_parser_method=add_parser_method, add_subparsers_method=add_subparsers_method, formatter_class=formatter_class, ) if cli_parse_args not in (None, False): if cli_parse_args is True: cli_parse_args = sys.argv[1:] elif not isinstance(cli_parse_args, (list, tuple)): raise SettingsError( f'cli_parse_args must be a list or tuple of strings, received {type(cli_parse_args)}' ) self._load_env_vars(parsed_args=self._parse_args(self.root_parser, cli_parse_args)) @overload def __call__(self) -> dict[str, Any]: ... @overload def __call__(self, *, args: list[str] | tuple[str, ...] | bool) -> CliSettingsSource[T]: """ Parse and load the command line arguments list into the CLI settings source. Args: args: The command line arguments to parse and load. Defaults to `None`, which means do not parse command line arguments. If set to `True`, defaults to sys.argv[1:]. If set to `False`, does not parse command line arguments. Returns: CliSettingsSource: The object instance itself. """ ... @overload def __call__(self, *, parsed_args: Namespace | SimpleNamespace | dict[str, Any]) -> CliSettingsSource[T]: """ Loads parsed command line arguments into the CLI settings source. Note: The parsed args must be in `argparse.Namespace`, `SimpleNamespace`, or vars dictionary (e.g., vars(argparse.Namespace)) format. Args: parsed_args: The parsed args to load. Returns: CliSettingsSource: The object instance itself. """ ... def __call__( self, *, args: list[str] | tuple[str, ...] | bool | None = None, parsed_args: Namespace | SimpleNamespace | dict[str, list[str] | str] | None = None, ) -> dict[str, Any] | CliSettingsSource[T]: if args is not None and parsed_args is not None: raise SettingsError('`args` and `parsed_args` are mutually exclusive') elif args is not None: if args is False: return self._load_env_vars(parsed_args={}) if args is True: args = sys.argv[1:] return self._load_env_vars(parsed_args=self._parse_args(self.root_parser, args)) elif parsed_args is not None: return self._load_env_vars(parsed_args=parsed_args) else: return super().__call__() @overload def _load_env_vars(self) -> Mapping[str, str | None]: ... @overload def _load_env_vars(self, *, parsed_args: Namespace | SimpleNamespace | dict[str, Any]) -> CliSettingsSource[T]: """ Loads the parsed command line arguments into the CLI environment settings variables. Note: The parsed args must be in `argparse.Namespace`, `SimpleNamespace`, or vars dictionary (e.g., vars(argparse.Namespace)) format. Args: parsed_args: The parsed args to load. Returns: CliSettingsSource: The object instance itself. """ ... def _load_env_vars( self, *, parsed_args: Namespace | SimpleNamespace | dict[str, list[str] | str] | None = None ) -> Mapping[str, str | None] | CliSettingsSource[T]: if parsed_args is None: return {} if isinstance(parsed_args, (Namespace, SimpleNamespace)): parsed_args = vars(parsed_args) selected_subcommands: list[str] = [] for field_name, val in parsed_args.items(): if isinstance(val, list): parsed_args[field_name] = self._merge_parsed_list(val, field_name) elif field_name.endswith(':subcommand') and val is not None: subcommand_name = field_name.split(':')[0] + val subcommand_dest = self._cli_subcommands[field_name][subcommand_name] selected_subcommands.append(subcommand_dest) for subcommands in self._cli_subcommands.values(): for subcommand_dest in subcommands.values(): if subcommand_dest not in selected_subcommands: parsed_args[subcommand_dest] = self.cli_parse_none_str parsed_args = { key: val for key, val in parsed_args.items() if not key.endswith(':subcommand') and val is not PydanticUndefined } if selected_subcommands: last_selected_subcommand = max(selected_subcommands, key=len) if not any(field_name for field_name in parsed_args.keys() if f'{last_selected_subcommand}.' in field_name): parsed_args[last_selected_subcommand] = '{}' parsed_args.update(self._cli_unknown_args) self.env_vars = parse_env_vars( cast(Mapping[str, str], parsed_args), self.case_sensitive, self.env_ignore_empty, self.cli_parse_none_str, ) return self def _get_merge_parsed_list_types( self, parsed_list: list[str], field_name: str ) -> tuple[Optional[type], Optional[type]]: merge_type = self._cli_dict_args.get(field_name, list) if ( merge_type is list or not is_union_origin(get_origin(merge_type)) or not any( type_ for type_ in get_args(merge_type) if type_ is not type(None) and get_origin(type_) not in (dict, Mapping) ) ): inferred_type = merge_type else: inferred_type = list if parsed_list and (len(parsed_list) > 1 or parsed_list[0].startswith('[')) else str return merge_type, inferred_type def _merge_parsed_list(self, parsed_list: list[str], field_name: str) -> str: try: merged_list: list[str] = [] is_last_consumed_a_value = False merge_type, inferred_type = self._get_merge_parsed_list_types(parsed_list, field_name) for val in parsed_list: if not isinstance(val, str): # If val is not a string, it's from an external parser and we can ignore parsing the rest of the # list. break val = val.strip() if val.startswith('[') and val.endswith(']'): val = val[1:-1].strip() while val: val = val.strip() if val.startswith(','): val = self._consume_comma(val, merged_list, is_last_consumed_a_value) is_last_consumed_a_value = False else: if val.startswith('{') or val.startswith('['): val = self._consume_object_or_array(val, merged_list) else: try: val = self._consume_string_or_number(val, merged_list, merge_type) except ValueError as e: if merge_type is inferred_type: raise e merge_type = inferred_type val = self._consume_string_or_number(val, merged_list, merge_type) is_last_consumed_a_value = True if not is_last_consumed_a_value: val = self._consume_comma(val, merged_list, is_last_consumed_a_value) if merge_type is str: return merged_list[0] elif merge_type is list: return f'[{",".join(merged_list)}]' else: merged_dict: dict[str, str] = {} for item in merged_list: merged_dict.update(json.loads(item)) return json.dumps(merged_dict) except Exception as e: raise SettingsError(f'Parsing error encountered for {field_name}: {e}') def _consume_comma(self, item: str, merged_list: list[str], is_last_consumed_a_value: bool) -> str: if not is_last_consumed_a_value: merged_list.append('""') return item[1:] def _consume_object_or_array(self, item: str, merged_list: list[str]) -> str: count = 1 close_delim = '}' if item.startswith('{') else ']' for consumed in range(1, len(item)): if item[consumed] in ('{', '['): count += 1 elif item[consumed] in ('}', ']'): count -= 1 if item[consumed] == close_delim and count == 0: merged_list.append(item[: consumed + 1]) return item[consumed + 1 :] raise SettingsError(f'Missing end delimiter "{close_delim}"') def _consume_string_or_number(self, item: str, merged_list: list[str], merge_type: type[Any] | None) -> str: consumed = 0 if merge_type is not str else len(item) is_find_end_quote = False while consumed < len(item): if item[consumed] == '"' and (consumed == 0 or item[consumed - 1] != '\\'): is_find_end_quote = not is_find_end_quote if not is_find_end_quote and item[consumed] == ',': break consumed += 1 if is_find_end_quote: raise SettingsError('Mismatched quotes') val_string = item[:consumed].strip() if merge_type in (list, str): try: float(val_string) except ValueError: if val_string == self.cli_parse_none_str: val_string = 'null' if val_string not in ('true', 'false', 'null') and not val_string.startswith('"'): val_string = f'"{val_string}"' merged_list.append(val_string) else: key, val = (kv for kv in val_string.split('=', 1)) if key.startswith('"') and not key.endswith('"') and not val.startswith('"') and val.endswith('"'): raise ValueError(f'Dictionary key=val parameter is a quoted string: {val_string}') key, val = key.strip('"'), val.strip('"') merged_list.append(json.dumps({key: val})) return item[consumed:] def _get_sub_models(self, model: type[BaseModel], field_name: str, field_info: FieldInfo) -> list[type[BaseModel]]: field_types: tuple[Any, ...] = ( (field_info.annotation,) if not get_args(field_info.annotation) else get_args(field_info.annotation) ) if self.cli_hide_none_type: field_types = tuple([type_ for type_ in field_types if type_ is not type(None)]) sub_models: list[type[BaseModel]] = [] for type_ in field_types: if _annotation_contains_types(type_, (_CliSubCommand,), is_include_origin=False): raise SettingsError(f'CliSubCommand is not outermost annotation for {model.__name__}.{field_name}') elif _annotation_contains_types(type_, (_CliPositionalArg,), is_include_origin=False): raise SettingsError(f'CliPositionalArg is not outermost annotation for {model.__name__}.{field_name}') if is_model_class(_strip_annotated(type_)) or is_pydantic_dataclass(_strip_annotated(type_)): sub_models.append(_strip_annotated(type_)) return sub_models def _verify_cli_flag_annotations(self, model: type[BaseModel], field_name: str, field_info: FieldInfo) -> None: if _CliImplicitFlag in field_info.metadata: cli_flag_name = 'CliImplicitFlag' elif _CliExplicitFlag in field_info.metadata: cli_flag_name = 'CliExplicitFlag' else: return if field_info.annotation is not bool: raise SettingsError(f'{cli_flag_name} argument {model.__name__}.{field_name} is not of type bool') def _sort_arg_fields(self, model: type[BaseModel]) -> list[tuple[str, FieldInfo]]: positional_variadic_arg = [] positional_args, subcommand_args, optional_args = [], [], [] for field_name, field_info in _get_model_fields(model).items(): if _CliSubCommand in field_info.metadata: if not field_info.is_required(): raise SettingsError(f'subcommand argument {model.__name__}.{field_name} has a default value') else: alias_names, *_ = _get_alias_names(field_name, field_info) if len(alias_names) > 1: raise SettingsError(f'subcommand argument {model.__name__}.{field_name} has multiple aliases') field_types = [type_ for type_ in get_args(field_info.annotation) if type_ is not type(None)] for field_type in field_types: if not (is_model_class(field_type) or is_pydantic_dataclass(field_type)): raise SettingsError( f'subcommand argument {model.__name__}.{field_name} has type not derived from BaseModel' ) subcommand_args.append((field_name, field_info)) elif _CliPositionalArg in field_info.metadata: alias_names, *_ = _get_alias_names(field_name, field_info) if len(alias_names) > 1: raise SettingsError(f'positional argument {model.__name__}.{field_name} has multiple aliases') is_append_action = _annotation_contains_types( field_info.annotation, (list, set, dict, Sequence, Mapping), is_strip_annotated=True ) if not is_append_action: positional_args.append((field_name, field_info)) else: positional_variadic_arg.append((field_name, field_info)) else: self._verify_cli_flag_annotations(model, field_name, field_info) optional_args.append((field_name, field_info)) if positional_variadic_arg: if len(positional_variadic_arg) > 1: field_names = ', '.join([name for name, info in positional_variadic_arg]) raise SettingsError(f'{model.__name__} has multiple variadic positional arguments: {field_names}') elif subcommand_args: field_names = ', '.join([name for name, info in positional_variadic_arg + subcommand_args]) raise SettingsError( f'{model.__name__} has variadic positional arguments and subcommand arguments: {field_names}' ) return positional_args + positional_variadic_arg + subcommand_args + optional_args @property def root_parser(self) -> T: """The connected root parser instance.""" return self._root_parser def _connect_parser_method( self, parser_method: Callable[..., Any] | None, method_name: str, *args: Any, **kwargs: Any ) -> Callable[..., Any]: if ( parser_method is not None and self.case_sensitive is False and method_name == 'parse_args_method' and isinstance(self._root_parser, _CliInternalArgParser) ): def parse_args_insensitive_method( root_parser: _CliInternalArgParser, args: list[str] | tuple[str, ...] | None = None, namespace: Namespace | None = None, ) -> Any: insensitive_args = [] for arg in shlex.split(shlex.join(args)) if args else []: flag_prefix = rf'\{self.cli_flag_prefix_char}{{1,2}}' matched = re.match(rf'^({flag_prefix}[^\s=]+)(.*)', arg) if matched: arg = matched.group(1).lower() + matched.group(2) insensitive_args.append(arg) return parser_method(root_parser, insensitive_args, namespace) # type: ignore return parse_args_insensitive_method elif parser_method is None: def none_parser_method(*args: Any, **kwargs: Any) -> Any: raise SettingsError( f'cannot connect CLI settings source root parser: {method_name} is set to `None` but is needed for connecting' ) return none_parser_method else: return parser_method def _connect_group_method(self, add_argument_group_method: Callable[..., Any] | None) -> Callable[..., Any]: add_argument_group = self._connect_parser_method(add_argument_group_method, 'add_argument_group_method') def add_group_method(parser: Any, **kwargs: Any) -> Any: if not kwargs.pop('_is_cli_mutually_exclusive_group'): kwargs.pop('required') return add_argument_group(parser, **kwargs) else: main_group_kwargs = {arg: kwargs.pop(arg) for arg in ['title', 'description'] if arg in kwargs} main_group_kwargs['title'] += ' (mutually exclusive)' group = add_argument_group(parser, **main_group_kwargs) if not hasattr(group, 'add_mutually_exclusive_group'): raise SettingsError( 'cannot connect CLI settings source root parser: ' 'group object is missing add_mutually_exclusive_group but is needed for connecting' ) return group.add_mutually_exclusive_group(**kwargs) return add_group_method def _connect_root_parser( self, root_parser: T, parse_args_method: Callable[..., Any] | None, add_argument_method: Callable[..., Any] | None = ArgumentParser.add_argument, add_argument_group_method: Callable[..., Any] | None = ArgumentParser.add_argument_group, add_parser_method: Callable[..., Any] | None = _SubParsersAction.add_parser, add_subparsers_method: Callable[..., Any] | None = ArgumentParser.add_subparsers, formatter_class: Any = RawDescriptionHelpFormatter, ) -> None: self._cli_unknown_args: dict[str, list[str]] = {} def _parse_known_args(*args: Any, **kwargs: Any) -> Namespace: args, unknown_args = ArgumentParser.parse_known_args(*args, **kwargs) for dest in self._cli_unknown_args: self._cli_unknown_args[dest] = unknown_args return cast(Namespace, args) self._root_parser = root_parser if parse_args_method is None: parse_args_method = _parse_known_args if self.cli_ignore_unknown_args else ArgumentParser.parse_args self._parse_args = self._connect_parser_method(parse_args_method, 'parse_args_method') self._add_argument = self._connect_parser_method(add_argument_method, 'add_argument_method') self._add_group = self._connect_group_method(add_argument_group_method) self._add_parser = self._connect_parser_method(add_parser_method, 'add_parser_method') self._add_subparsers = self._connect_parser_method(add_subparsers_method, 'add_subparsers_method') self._formatter_class = formatter_class self._cli_dict_args: dict[str, type[Any] | None] = {} self._cli_subcommands: defaultdict[str, dict[str, str]] = defaultdict(dict) self._add_parser_args( parser=self.root_parser, model=self.settings_cls, added_args=[], arg_prefix=self.env_prefix, subcommand_prefix=self.env_prefix, group=None, alias_prefixes=[], model_default=PydanticUndefined, ) def _add_parser_args( self, parser: Any, model: type[BaseModel], added_args: list[str], arg_prefix: str, subcommand_prefix: str, group: Any, alias_prefixes: list[str], model_default: Any, is_model_suppressed: bool = False, ) -> ArgumentParser: subparsers: Any = None alias_path_args: dict[str, str] = {} # Ignore model default if the default is a model and not a subclass of the current model. model_default = ( None if ( (is_model_class(type(model_default)) or is_pydantic_dataclass(type(model_default))) and not issubclass(type(model_default), model) ) else model_default ) for field_name, field_info in self._sort_arg_fields(model): sub_models: list[type[BaseModel]] = self._get_sub_models(model, field_name, field_info) alias_names, is_alias_path_only = _get_alias_names( field_name, field_info, alias_path_args=alias_path_args, case_sensitive=self.case_sensitive ) preferred_alias = alias_names[0] if _CliSubCommand in field_info.metadata: for model in sub_models: subcommand_alias = self._check_kebab_name( model.__name__ if len(sub_models) > 1 else preferred_alias ) subcommand_name = f'{arg_prefix}{subcommand_alias}' subcommand_dest = f'{arg_prefix}{preferred_alias}' self._cli_subcommands[f'{arg_prefix}:subcommand'][subcommand_name] = subcommand_dest subcommand_help = None if len(sub_models) > 1 else field_info.description if self.cli_use_class_docs_for_groups: subcommand_help = None if model.__doc__ is None else dedent(model.__doc__) subparsers = ( self._add_subparsers( parser, title='subcommands', dest=f'{arg_prefix}:subcommand', description=field_info.description if len(sub_models) > 1 else None, ) if subparsers is None else subparsers ) if hasattr(subparsers, 'metavar'): subparsers.metavar = ( f'{subparsers.metavar[:-1]},{subcommand_alias}}}' if subparsers.metavar else f'{{{subcommand_alias}}}' ) self._add_parser_args( parser=self._add_parser( subparsers, subcommand_alias, help=subcommand_help, formatter_class=self._formatter_class, description=None if model.__doc__ is None else dedent(model.__doc__), ), model=model, added_args=[], arg_prefix=f'{arg_prefix}{preferred_alias}.', subcommand_prefix=f'{subcommand_prefix}{preferred_alias}.', group=None, alias_prefixes=[], model_default=PydanticUndefined, ) else: flag_prefix: str = self._cli_flag_prefix is_append_action = _annotation_contains_types( field_info.annotation, (list, set, dict, Sequence, Mapping), is_strip_annotated=True ) is_parser_submodel = sub_models and not is_append_action kwargs: dict[str, Any] = {} kwargs['default'] = CLI_SUPPRESS kwargs['help'] = self._help_format(field_name, field_info, model_default, is_model_suppressed) kwargs['metavar'] = self._metavar_format(field_info.annotation) kwargs['required'] = ( self.cli_enforce_required and field_info.is_required() and model_default is PydanticUndefined ) kwargs['dest'] = ( # Strip prefix if validation alias is set and value is not complex. # Related https://github.com/pydantic/pydantic-settings/pull/25 f'{arg_prefix}{preferred_alias}'[self.env_prefix_len :] if arg_prefix and field_info.validation_alias is not None and not is_parser_submodel else f'{arg_prefix}{preferred_alias}' ) arg_names = self._get_arg_names(arg_prefix, subcommand_prefix, alias_prefixes, alias_names, added_args) if not arg_names or (kwargs['dest'] in added_args): continue self._convert_append_action(kwargs, field_info, is_append_action) if _CliPositionalArg in field_info.metadata: arg_names, flag_prefix = self._convert_positional_arg( kwargs, field_info, preferred_alias, model_default ) self._convert_bool_flag(kwargs, field_info, model_default) if is_parser_submodel: self._add_parser_submodels( parser, model, sub_models, added_args, arg_prefix, subcommand_prefix, flag_prefix, arg_names, kwargs, field_name, field_info, alias_names, model_default=model_default, is_model_suppressed=is_model_suppressed, ) elif _CliUnknownArgs in field_info.metadata: self._cli_unknown_args[kwargs['dest']] = [] elif not is_alias_path_only: if group is not None: if isinstance(group, dict): group = self._add_group(parser, **group) added_args += list(arg_names) self._add_argument( group, *(f'{flag_prefix[: len(name)]}{name}' for name in arg_names), **kwargs ) else: added_args += list(arg_names) self._add_argument( parser, *(f'{flag_prefix[: len(name)]}{name}' for name in arg_names), **kwargs ) self._add_parser_alias_paths(parser, alias_path_args, added_args, arg_prefix, subcommand_prefix, group) return parser def _check_kebab_name(self, name: str) -> str: if self.cli_kebab_case: return name.replace('_', '-') return name def _convert_append_action(self, kwargs: dict[str, Any], field_info: FieldInfo, is_append_action: bool) -> None: if is_append_action: kwargs['action'] = 'append' if _annotation_contains_types(field_info.annotation, (dict, Mapping), is_strip_annotated=True): self._cli_dict_args[kwargs['dest']] = field_info.annotation def _convert_bool_flag(self, kwargs: dict[str, Any], field_info: FieldInfo, model_default: Any) -> None: if kwargs['metavar'] == 'bool': if (self.cli_implicit_flags or _CliImplicitFlag in field_info.metadata) and ( _CliExplicitFlag not in field_info.metadata ): del kwargs['metavar'] kwargs['action'] = BooleanOptionalAction def _convert_positional_arg( self, kwargs: dict[str, Any], field_info: FieldInfo, preferred_alias: str, model_default: Any ) -> tuple[list[str], str]: flag_prefix = '' arg_names = [kwargs['dest']] kwargs['default'] = PydanticUndefined kwargs['metavar'] = self._check_kebab_name(preferred_alias.upper()) # Note: CLI positional args are always strictly required at the CLI. Therefore, use field_info.is_required in # conjunction with model_default instead of the derived kwargs['required']. is_required = field_info.is_required() and model_default is PydanticUndefined if kwargs.get('action') == 'append': del kwargs['action'] kwargs['nargs'] = '+' if is_required else '*' elif not is_required: kwargs['nargs'] = '?' del kwargs['dest'] del kwargs['required'] return arg_names, flag_prefix def _get_arg_names( self, arg_prefix: str, subcommand_prefix: str, alias_prefixes: list[str], alias_names: tuple[str, ...], added_args: list[str], ) -> list[str]: arg_names: list[str] = [] for prefix in [arg_prefix] + alias_prefixes: for name in alias_names: arg_name = self._check_kebab_name( f'{prefix}{name}' if subcommand_prefix == self.env_prefix else f'{prefix.replace(subcommand_prefix, "", 1)}{name}' ) if arg_name not in added_args: arg_names.append(arg_name) return arg_names def _add_parser_submodels( self, parser: Any, model: type[BaseModel], sub_models: list[type[BaseModel]], added_args: list[str], arg_prefix: str, subcommand_prefix: str, flag_prefix: str, arg_names: list[str], kwargs: dict[str, Any], field_name: str, field_info: FieldInfo, alias_names: tuple[str, ...], model_default: Any, is_model_suppressed: bool, ) -> None: if issubclass(model, CliMutuallyExclusiveGroup): # Argparse has deprecated "calling add_argument_group() or add_mutually_exclusive_group() on a # mutually exclusive group" (https://docs.python.org/3/library/argparse.html#mutual-exclusion). # Since nested models result in a group add, raise an exception for nested models in a mutually # exclusive group. raise SettingsError('cannot have nested models in a CliMutuallyExclusiveGroup') model_group: Any = None model_group_kwargs: dict[str, Any] = {} model_group_kwargs['title'] = f'{arg_names[0]} options' model_group_kwargs['description'] = field_info.description model_group_kwargs['required'] = kwargs['required'] model_group_kwargs['_is_cli_mutually_exclusive_group'] = any( issubclass(model, CliMutuallyExclusiveGroup) for model in sub_models ) if model_group_kwargs['_is_cli_mutually_exclusive_group'] and len(sub_models) > 1: raise SettingsError('cannot use union with CliMutuallyExclusiveGroup') if self.cli_use_class_docs_for_groups and len(sub_models) == 1: model_group_kwargs['description'] = None if sub_models[0].__doc__ is None else dedent(sub_models[0].__doc__) if model_default is not PydanticUndefined: if is_model_class(type(model_default)) or is_pydantic_dataclass(type(model_default)): model_default = getattr(model_default, field_name) else: if field_info.default is not PydanticUndefined: model_default = field_info.default elif field_info.default_factory is not None: model_default = field_info.default_factory if model_default is None: desc_header = f'default: {self.cli_parse_none_str} (undefined)' if model_group_kwargs['description'] is not None: model_group_kwargs['description'] = dedent(f'{desc_header}\n{model_group_kwargs["description"]}') else: model_group_kwargs['description'] = desc_header preferred_alias = alias_names[0] is_model_suppressed = self._is_field_suppressed(field_info) or is_model_suppressed if not self.cli_avoid_json: added_args.append(arg_names[0]) kwargs['nargs'] = '?' kwargs['const'] = '{}' kwargs['help'] = kwargs['help'] = ( CLI_SUPPRESS if is_model_suppressed else f'set {arg_names[0]} from JSON string (default: {{}})' ) model_group = self._add_group(parser, **model_group_kwargs) self._add_argument(model_group, *(f'{flag_prefix}{name}' for name in arg_names), **kwargs) for model in sub_models: self._add_parser_args( parser=parser, model=model, added_args=added_args, arg_prefix=f'{arg_prefix}{preferred_alias}.', subcommand_prefix=subcommand_prefix, group=model_group if model_group else model_group_kwargs, alias_prefixes=[f'{arg_prefix}{name}.' for name in alias_names[1:]], model_default=model_default, is_model_suppressed=is_model_suppressed, ) def _add_parser_alias_paths( self, parser: Any, alias_path_args: dict[str, str], added_args: list[str], arg_prefix: str, subcommand_prefix: str, group: Any, ) -> None: if alias_path_args: context = parser if group is not None: context = self._add_group(parser, **group) if isinstance(group, dict) else group is_nested_alias_path = arg_prefix.endswith('.') arg_prefix = arg_prefix[:-1] if is_nested_alias_path else arg_prefix for name, metavar in alias_path_args.items(): name = '' if is_nested_alias_path else name arg_name = ( f'{arg_prefix}{name}' if subcommand_prefix == self.env_prefix else f'{arg_prefix.replace(subcommand_prefix, "", 1)}{name}' ) kwargs: dict[str, Any] = {} kwargs['default'] = CLI_SUPPRESS kwargs['help'] = 'pydantic alias path' kwargs['dest'] = f'{arg_prefix}{name}' if metavar == 'dict' or is_nested_alias_path: kwargs['metavar'] = 'dict' else: kwargs['action'] = 'append' kwargs['metavar'] = 'list' if arg_name not in added_args: added_args.append(arg_name) self._add_argument(context, f'{self._cli_flag_prefix}{arg_name}', **kwargs) def _get_modified_args(self, obj: Any) -> tuple[str, ...]: if not self.cli_hide_none_type: return get_args(obj) else: return tuple([type_ for type_ in get_args(obj) if type_ is not type(None)]) def _metavar_format_choices(self, args: list[str], obj_qualname: str | None = None) -> str: if 'JSON' in args: args = args[: args.index('JSON') + 1] + [arg for arg in args[args.index('JSON') + 1 :] if arg != 'JSON'] metavar = ','.join(args) if obj_qualname: return f'{obj_qualname}[{metavar}]' else: return metavar if len(args) == 1 else f'{{{metavar}}}' def _metavar_format_recurse(self, obj: Any) -> str: """Pretty metavar representation of a type. Adapts logic from `pydantic._repr.display_as_type`.""" obj = _strip_annotated(obj) if _is_function(obj): # If function is locally defined use __name__ instead of __qualname__ return obj.__name__ if '' in obj.__qualname__ else obj.__qualname__ elif obj is ...: return '...' elif isinstance(obj, Representation): return repr(obj) elif typing_objects.is_typealiastype(obj): return str(obj) origin = get_origin(obj) if origin is None and not isinstance(obj, (type, typing.ForwardRef, typing_extensions.ForwardRef)): obj = obj.__class__ if is_union_origin(origin): return self._metavar_format_choices(list(map(self._metavar_format_recurse, self._get_modified_args(obj)))) elif typing_objects.is_literal(origin): return self._metavar_format_choices(list(map(str, self._get_modified_args(obj)))) elif _lenient_issubclass(obj, Enum): return self._metavar_format_choices([val.name for val in obj]) elif isinstance(obj, _WithArgsTypes): return self._metavar_format_choices( list(map(self._metavar_format_recurse, self._get_modified_args(obj))), obj_qualname=obj.__qualname__ if hasattr(obj, '__qualname__') else str(obj), ) elif obj is type(None): return self.cli_parse_none_str elif is_model_class(obj): return 'JSON' elif isinstance(obj, type): return obj.__qualname__ else: return repr(obj).replace('typing.', '').replace('typing_extensions.', '') def _metavar_format(self, obj: Any) -> str: return self._metavar_format_recurse(obj).replace(', ', ',') def _help_format( self, field_name: str, field_info: FieldInfo, model_default: Any, is_model_suppressed: bool ) -> str: _help = field_info.description if field_info.description else '' if is_model_suppressed or self._is_field_suppressed(field_info): return CLI_SUPPRESS if field_info.is_required() and model_default in (PydanticUndefined, None): if _CliPositionalArg not in field_info.metadata: ifdef = 'ifdef: ' if model_default is None else '' _help += f' ({ifdef}required)' if _help else f'({ifdef}required)' else: default = f'(default: {self.cli_parse_none_str})' if is_model_class(type(model_default)) or is_pydantic_dataclass(type(model_default)): default = f'(default: {getattr(model_default, field_name)})' elif model_default not in (PydanticUndefined, None) and _is_function(model_default): default = f'(default factory: {self._metavar_format(model_default)})' elif field_info.default not in (PydanticUndefined, None): enum_name = _annotation_enum_val_to_name(field_info.annotation, field_info.default) default = f'(default: {field_info.default if enum_name is None else enum_name})' elif field_info.default_factory is not None: default = f'(default factory: {self._metavar_format(field_info.default_factory)})' _help += f' {default}' if _help else default return _help.replace('%', '%%') if issubclass(type(self._root_parser), ArgumentParser) else _help def _is_field_suppressed(self, field_info: FieldInfo) -> bool: _help = field_info.description if field_info.description else '' return _help == CLI_SUPPRESS or CLI_SUPPRESS in field_info.metadata