JezK

Edit File: configargparse.py

import argparse import glob import os import re import sys import types if sys.version_info >= (3, 0): from io import StringIO else: from StringIO import StringIO if sys.version_info < (2, 7): from ordereddict import OrderedDict else: from collections import OrderedDict ACTION_TYPES_THAT_DONT_NEED_A_VALUE = set([argparse._StoreTrueAction, argparse._StoreFalseAction, argparse._CountAction, argparse._StoreConstAction, argparse._AppendConstAction]) # global ArgumentParser instances _parsers = {} def init_argument_parser(name=None, **kwargs): """Creates a global ArgumentParser instance with the given name, passing any args other than "name" to the ArgumentParser constructor. This instance can then be retrieved using get_argument_parser(..) """ if name is None: name = "default" if name in _parsers: raise ValueError(("kwargs besides 'name' can only be passed in the" " first time. '%s' ArgumentParser already exists: %s") % ( name, _parsers[name])) kwargs.setdefault('formatter_class', argparse.ArgumentDefaultsHelpFormatter) kwargs.setdefault('conflict_handler', 'resolve') _parsers[name] = ArgumentParser(**kwargs) def get_argument_parser(name=None, **kwargs): """Returns the global ArgumentParser instance with the given name. The 1st time this function is called, a new ArgumentParser instance will be created for the given name, and any args other than "name" will be passed on to the ArgumentParser constructor. """ if name is None: name = "default" if len(kwargs) > 0 or name not in _parsers: init_argument_parser(name, **kwargs) return _parsers[name] class ArgumentDefaultsRawHelpFormatter( argparse.ArgumentDefaultsHelpFormatter, argparse.RawTextHelpFormatter, argparse.RawDescriptionHelpFormatter): """HelpFormatter that adds default values AND doesn't do line-wrapping""" pass class ConfigFileParser(object): """This abstract class can be extended to add support for new config file formats""" def get_syntax_description(self): """Returns a string describing the config file syntax.""" raise NotImplementedError("get_syntax_description(..) not implemented") def parse(self, stream): """Parses the keys and values from a config file. NOTE: For keys that were specified to configargparse as action="store_true" or "store_false", the config file value must be one of: "yes", "no", "true", "false". Otherwise an error will be raised. Args: stream: A config file input stream (such as an open file object). Returns: OrderedDict of items where the keys have type string and the values have type either string or list (eg. to support config file formats like YAML which allow lists). """ raise NotImplementedError("parse(..) not implemented") def serialize(self, items): """Does the inverse of config parsing by taking parsed values and converting them back to a string representing config file contents. Args: items: an OrderedDict of items to be converted to the config file format. Keys should be strings, and values should be either strings or lists. Returns: Contents of config file as a string """ raise NotImplementedError("serialize(..) not implemented") class ConfigFileParserException(Exception): """Raised when config file parsing failed.""" class DefaultConfigFileParser(ConfigFileParser): """Based on a simplified subset of INI and YAML formats. Here is the supported syntax: # this is a comment ; this is also a comment (.ini style) --- # lines that start with --- are ignored (yaml style) ------------------- [section] # .ini-style section names are treated as comments # how to specify a key-value pair (all of these are equivalent): name value # key is case sensitive: "Name" isn't "name" name = value # (.ini style) (white space is ignored, so name = value same as name=value) name: value # (yaml style) --name value # (argparse style) # how to set a flag arg (eg. arg which has action="store_true") --name name name = True # "True" and "true" are the same # how to specify a list arg (eg. arg which has action="append") fruit = [apple, orange, lemon] indexes = [1, 12, 35 , 40] """ def get_syntax_description(self): msg = ("Config file syntax allows: key=value, flag=true, stuff=[a,b,c] " "(for details, see syntax at https://goo.gl/R74nmi).") return msg def parse(self, stream): """Parses the keys + values from a config file.""" items = OrderedDict() for i, line in enumerate(stream): line = line.strip() if not line or line[0] in ["#", ";", "["] or line.startswith("---"): continue white_space = "\\s*" key = "(?P<key>[^:=;#\s]+?)" value = white_space+"[:=\s]"+white_space+"(?P<value>.+?)" comment = white_space+"(?P<comment>\\s[;#].*)?" key_only_match = re.match("^" + key + comment + "$", line) if key_only_match: key = key_only_match.group("key") items[key] = "true" continue key_value_match = re.match("^"+key+value+comment+"$", line) if key_value_match: key = key_value_match.group("key") value = key_value_match.group("value") if value.startswith("[") and value.endswith("]"): # handle special case of lists value = [elem.strip() for elem in value[1:-1].split(",")] items[key] = value continue raise ConfigFileParserException("Unexpected line %s in %s: %s" % (i, getattr(stream, 'name', 'stream'), line)) return items def serialize(self, items): """Does the inverse of config parsing by taking parsed values and converting them back to a string representing config file contents. """ r = StringIO() for key, value in items.items(): if type(value) == list: # handle special case of lists value = "["+", ".join(map(str, value))+"]" r.write("%s = %s\n" % (key, value)) return r.getvalue() class YAMLConfigFileParser(ConfigFileParser): """Parses YAML config files. Depends on the PyYAML module. https://pypi.python.org/pypi/PyYAML """ def get_syntax_description(self): msg = ("The config file uses YAML syntax and must represent a YAML " "'mapping' (for details, see http://learn.getgrav.org/advanced/yaml).") return msg def _load_yaml(self): """lazy-import PyYAML so that configargparse doesn't have to dependend on it unless this parser is used.""" try: import yaml except ImportError: raise ConfigFileParserException("Could not import yaml. " "It can be installed by running 'pip install PyYAML'") return yaml def parse(self, stream): """Parses the keys and values from a config file.""" yaml = self._load_yaml() try: parsed_obj = yaml.safe_load(stream) except Exception as e: raise ConfigFileParserException("Couldn't parse config file: %s" % e) if type(parsed_obj) != dict: raise ConfigFileParserException("The config file doesn't appear to " "contain 'key: value' pairs (aka. a YAML mapping). " "yaml.load('%s') returned type '%s' instead of 'dict'." % ( getattr(stream, 'name', 'stream'), type(parsed_obj).__name__)) result = OrderedDict() for key, value in parsed_obj.items(): if type(value) == list: result[key] = value else: result[key] = str(value) return result def serialize(self, items, default_flow_style=False): """Does the inverse of config parsing by taking parsed values and converting them back to a string representing config file contents. Args: default_flow_style: defines serialization format (see PyYAML docs) """ # lazy-import so there's no dependency on yaml unless this class is used yaml = self._load_yaml() # it looks like ordering can't be preserved: http://pyyaml.org/ticket/29 items = dict(items) return yaml.dump(items, default_flow_style=default_flow_style) # used while parsing args to keep track of where they came from _COMMAND_LINE_SOURCE_KEY = "command_line" _ENV_VAR_SOURCE_KEY = "environment_variables" _CONFIG_FILE_SOURCE_KEY = "config_file" _DEFAULTS_SOURCE_KEY = "defaults" class ArgumentParser(argparse.ArgumentParser): """Drop-in replacement for argparse.ArgumentParser that adds support for environment variables and .ini or .yaml-style config files. """ def __init__(self, prog=None, usage=None, description=None, epilog=None, version=None, parents=[], formatter_class=argparse.HelpFormatter, prefix_chars='-', fromfile_prefix_chars=None, argument_default=None, conflict_handler='error', add_help=True, add_config_file_help=True, add_env_var_help=True, auto_env_var_prefix=None, default_config_files=[], ignore_unknown_config_file_keys=False, config_file_parser_class=DefaultConfigFileParser, args_for_setting_config_path=[], config_arg_is_required=False, config_arg_help_message="config file path", args_for_writing_out_config_file=[], write_out_config_file_arg_help_message="takes the current command line " "args and writes them out to a config file at the given path, then " "exits", allow_abbrev=True, # new in python 3.5 ): """Supports all the same args as the argparse.ArgumentParser constructor, as well as the following additional args. Additional Args: add_config_file_help: Whether to add a description of config file syntax to the help message. add_env_var_help: Whether to add something to the help message for args that can be set through environment variables. auto_env_var_prefix: If set to a string instead of None, all config- file-settable options will become also settable via environment variables whose names are this prefix followed by the config file key, all in upper case. (eg. setting this to "foo_" will allow an arg like "--my-arg" to also be set via the FOO_MY_ARG environment variable) default_config_files: When specified, this list of config files will be parsed in order, with the values from each config file taking precedence over pervious ones. This allows an application to look for config files in multiple standard locations such as the install directory, home directory, and current directory. Also, shell * syntax can be used to specify all conf files in a directory. For exmaple: ["/etc/conf/app_config.ini", "/etc/conf/conf-enabled/*.ini", "~/.my_app_config.ini", "./app_config.txt"] ignore_unknown_config_file_keys: If true, settings that are found in a config file but don't correspond to any defined configargparse args will be ignored. If false, they will be processed and appended to the commandline like other args, and can be retrieved using parse_known_args() instead of parse_args() config_file_parser_class: configargparse.ConfigFileParser subclass which determines the config file format. configargparse comes with DefaultConfigFileParser and YAMLConfigFileParser. args_for_setting_config_path: A list of one or more command line args to be used for specifying the config file path (eg. ["-c", "--config-file"]). Default: [] config_arg_is_required: When args_for_setting_config_path is set, set this to True to always require users to provide a config path. config_arg_help_message: the help message to use for the args listed in args_for_setting_config_path. args_for_writing_out_config_file: A list of one or more command line args to use for specifying a config file output path. If provided, these args cause configargparse to write out a config file with settings based on the other provided commandline args, environment variants and defaults, and then to exit. (eg. ["-w", "--write-out-config-file"]). Default: [] write_out_config_file_arg_help_message: The help message to use for the args in args_for_writing_out_config_file. allow_abbrev: Allows long options to be abbreviated if the abbreviation is unambiguous. Default: True """ self._add_config_file_help = add_config_file_help self._add_env_var_help = add_env_var_help self._auto_env_var_prefix = auto_env_var_prefix # extract kwargs that can be passed to the super constructor kwargs_for_super = dict((k, v) for k, v in locals().items() if k in [ "prog", "usage", "description", "epilog", "version", "parents", "formatter_class", "prefix_chars", "fromfile_prefix_chars", "argument_default", "conflict_handler", "add_help"]) if sys.version_info >= (3, 3) and "version" in kwargs_for_super: del kwargs_for_super["version"] # version arg deprecated in v3.3 if sys.version_info >= (3, 5): kwargs_for_super["allow_abbrev"] = allow_abbrev # new option in v3.5 argparse.ArgumentParser.__init__(self, **kwargs_for_super) # parse the additionial args if config_file_parser_class is None: self._config_file_parser = DefaultConfigFileParser() else: self._config_file_parser = config_file_parser_class() self._default_config_files = default_config_files self._ignore_unknown_config_file_keys = ignore_unknown_config_file_keys if args_for_setting_config_path: self.add_argument(*args_for_setting_config_path, dest="config_file", required=config_arg_is_required, help=config_arg_help_message, is_config_file_arg=True) if args_for_writing_out_config_file: self.add_argument(*args_for_writing_out_config_file, dest="write_out_config_file_to_this_path", metavar="CONFIG_OUTPUT_PATH", help=write_out_config_file_arg_help_message, is_write_out_config_file_arg=True) def parse_args(self, args = None, namespace = None, config_file_contents = None, env_vars = os.environ): """Supports all the same args as the ArgumentParser.parse_args(..), as well as the following additional args. Additional Args: args: a list of args as in argparse, or a string (eg. "-x -y bla") config_file_contents: String. Used for testing. env_vars: Dictionary. Used for testing. """ args, argv = self.parse_known_args(args = args, namespace = namespace, config_file_contents = config_file_contents, env_vars = env_vars) if argv: self.error('unrecognized arguments: %s' % ' '.join(argv)) return args def parse_known_args(self, args = None, namespace = None, config_file_contents = None, env_vars = os.environ): """Supports all the same args as the ArgumentParser.parse_args(..), as well as the following additional args. Additional Args: args: a list of args as in argparse, or a string (eg. "-x -y bla") config_file_contents: String. Used for testing. env_vars: Dictionary. Used for testing. """ if args is None: args = sys.argv[1:] elif type(args) == str: args = args.split() else: args = list(args) # normalize args by converting args like --key=value to --key value normalized_args = list() for arg in args: if arg and arg[0] in self.prefix_chars and '=' in arg: key, value = arg.split('=', 1) normalized_args.append(key) normalized_args.append(value) else: normalized_args.append(arg) args = normalized_args for a in self._actions: a.is_positional_arg = not a.option_strings # maps a string describing the source (eg. env var) to a settings dict # to keep track of where values came from (used by print_values()). # The settings dicts for env vars and config files will then map # the config key to an (argparse Action obj, string value) 2-tuple. self._source_to_settings = OrderedDict() if args: a_v_pair = (None, list(args)) # copy args list to isolate changes self._source_to_settings[_COMMAND_LINE_SOURCE_KEY] = {'': a_v_pair} # handle auto_env_var_prefix __init__ arg by setting a.env_var as needed if self._auto_env_var_prefix is not None: for a in self._actions: config_file_keys = self.get_possible_config_keys(a) if config_file_keys and not (a.env_var or a.is_positional_arg or a.is_config_file_arg or a.is_write_out_config_file_arg or type(a) == argparse._HelpAction): stripped_config_file_key = config_file_keys[0].strip( self.prefix_chars) a.env_var = (self._auto_env_var_prefix + stripped_config_file_key).replace('-', '_').upper() # add env var settings to the commandline that aren't there already env_var_args = [] actions_with_env_var_values = [a for a in self._actions if not a.is_positional_arg and a.env_var and a.env_var in env_vars and not already_on_command_line(args, a.option_strings)] for action in actions_with_env_var_values: key = action.env_var value = env_vars[key] # TODO parse env var values here to allow lists? env_var_args += self.convert_item_to_command_line_arg( action, key, value) args = env_var_args + args if env_var_args: self._source_to_settings[_ENV_VAR_SOURCE_KEY] = OrderedDict( [(a.env_var, (a, env_vars[a.env_var])) for a in actions_with_env_var_values]) # before parsing any config files, check if -h was specified. supports_help_arg = any( a for a in self._actions if type(a) == argparse._HelpAction) skip_config_file_parsing = supports_help_arg and ( "-h" in args or "--help" in args) # prepare for reading config file(s) known_config_keys = dict((config_key, action) for action in self._actions for config_key in self.get_possible_config_keys(action)) # open the config file(s) config_streams = [] if config_file_contents: stream = StringIO(config_file_contents) stream.name = "method arg" config_streams = [stream] elif not skip_config_file_parsing: config_streams = self._open_config_files(args) # parse each config file for stream in reversed(config_streams): try: config_items = self._config_file_parser.parse(stream) except ConfigFileParserException as e: self.error(e) finally: if hasattr(stream, "close"): stream.close() # add each config item to the commandline unless it's there already config_args = [] for key, value in config_items.items(): if key in known_config_keys: action = known_config_keys[key] discard_this_key = already_on_command_line( args, action.option_strings) else: action = None discard_this_key = self._ignore_unknown_config_file_keys or \ already_on_command_line( args, self.get_command_line_key_for_unknown_config_file_setting(key)) if not discard_this_key: config_args += self.convert_item_to_command_line_arg( action, key, value) source_key = "%s|%s" %(_CONFIG_FILE_SOURCE_KEY, stream.name) if source_key not in self._source_to_settings: self._source_to_settings[source_key] = OrderedDict() self._source_to_settings[source_key][key] = (action, value) args = config_args + args # save default settings for use by print_values() default_settings = OrderedDict() for action in self._actions: cares_about_default_value = (not action.is_positional_arg or action.nargs in [OPTIONAL, ZERO_OR_MORE]) if (already_on_command_line(args, action.option_strings) or not cares_about_default_value or action.default is None or action.default == SUPPRESS or type(action) in ACTION_TYPES_THAT_DONT_NEED_A_VALUE): continue else: if action.option_strings: key = action.option_strings[-1] else: key = action.dest default_settings[key] = (action, str(action.default)) if default_settings: self._source_to_settings[_DEFAULTS_SOURCE_KEY] = default_settings # parse all args (including commandline, config file, and env var) namespace, unknown_args = argparse.ArgumentParser.parse_known_args( self, args=args, namespace=namespace) # handle any args that have is_write_out_config_file_arg set to true user_write_out_config_file_arg_actions = [a for a in self._actions if getattr(a, "is_write_out_config_file_arg", False)] if user_write_out_config_file_arg_actions: output_file_paths = [] for action in user_write_out_config_file_arg_actions: # check if the user specified this arg on the commandline output_file_path = getattr(namespace, action.dest, None) if output_file_path: # validate the output file path try: with open(output_file_path, "w") as output_file: output_file_paths.append(output_file_path) except IOError as e: raise ValueError("Couldn't open %s for writing: %s" % ( output_file_path, e)) if output_file_paths: # generate the config file contents config_items = self.get_items_for_config_file_output( self._source_to_settings, namespace) file_contents = self._config_file_parser.serialize(config_items) for output_file_path in output_file_paths: with open(output_file_path, "w") as output_file: output_file.write(file_contents) if len(output_file_paths) == 1: output_file_paths = output_file_paths[0] self.exit(0, "Wrote config file to " + str(output_file_paths)) return namespace, unknown_args def get_command_line_key_for_unknown_config_file_setting(self, key): """Compute a commandline arg key to be used for a config file setting that doesn't correspond to any defined configargparse arg (and so doesn't have a user-specified commandline arg key). Args: key: The config file key that was being set. """ key_without_prefix_chars = key.strip(self.prefix_chars) command_line_key = self.prefix_chars[0]*2 + key_without_prefix_chars return command_line_key def get_items_for_config_file_output(self, source_to_settings, parsed_namespace): """Converts the given settings back to a dictionary that can be passed to ConfigFormatParser.serialize(..). Args: source_to_settings: the dictionary described in parse_known_args() parsed_namespace: namespace object created within parse_known_args() Returns: an OrderedDict where keys are strings and values are either strings or lists """ config_file_items = OrderedDict() for source, settings in source_to_settings.items(): if source == _COMMAND_LINE_SOURCE_KEY: _, existing_command_line_args = settings[''] for action in self._actions: config_file_keys = self.get_possible_config_keys(action) if config_file_keys and not action.is_positional_arg and \ already_on_command_line(existing_command_line_args, action.option_strings): value = getattr(parsed_namespace, action.dest, None) if value is not None: if type(value) is bool: value = str(value).lower() config_file_items[config_file_keys[0]] = value elif source == _ENV_VAR_SOURCE_KEY: for key, (action, value) in settings.items(): config_file_keys = self.get_possible_config_keys(action) if config_file_keys: value = getattr(parsed_namespace, action.dest, None) if value is not None: config_file_items[config_file_keys[0]] = value elif source.startswith(_CONFIG_FILE_SOURCE_KEY): for key, (action, value) in settings.items(): config_file_items[key] = value elif source == _DEFAULTS_SOURCE_KEY: for key, (action, value) in settings.items(): config_file_keys = self.get_possible_config_keys(action) if config_file_keys: value = getattr(parsed_namespace, action.dest, None) if value is not None: config_file_items[config_file_keys[0]] = value return config_file_items 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 type(action) in ACTION_TYPES_THAT_DONT_NEED_A_VALUE: if value.lower() in ("true", "false", "yes", "no"): args.append( command_line_key ) else: self.error("Unexpected value for %s: '%s'. Expecting 'true', " "'false', 'yes', or 'no'" % (key, value)) elif type(value) == list: if action is None or type(action) == argparse._AppendAction: for list_elem in value: args.append( command_line_key ) args.append( str(list_elem) ) elif (type(action) == argparse._StoreAction and action.nargs in ('+', '*')) or ( type(action.nargs) is 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 type(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 def get_possible_config_keys(self, action): """This method decides which actions can be set in a config file and what their keys will be. It returns a list of 0 or more config keys that can be used to set the given action's value in a config file. """ keys = [] for arg in action.option_strings: if any([arg.startswith(2*c) for c in self.prefix_chars]): keys += [arg[2:], arg] # eg. for '--bla' return ['bla', '--bla'] return keys def _open_config_files(self, command_line_args): """Tries to parse config file path(s) from within command_line_args. Returns a list of opened config files, including files specified on the commandline as well as any default_config_files specified in the constructor that are present on disk. Args: command_line_args: List of all args (already split on spaces) """ # open any default config files config_files = [open(f) for files in map(glob.glob, map(os.path.expanduser, self._default_config_files)) for f in files] # list actions with is_config_file_arg=True. Its possible there is more # than one such arg. user_config_file_arg_actions = [ a for a in self._actions if getattr(a, "is_config_file_arg", False)] if not user_config_file_arg_actions: return config_files for action in user_config_file_arg_actions: # try to parse out the config file path by using a clean new # ArgumentParser that only knows this one arg/action. arg_parser = argparse.ArgumentParser( prefix_chars=self.prefix_chars, add_help=False) arg_parser._add_action(action) # make parser not exit on error by replacing its error method. # Otherwise it sys.exits(..) if, for example, config file # is_required=True and user doesn't provide it. def error_method(self, message): pass arg_parser.error = types.MethodType(error_method, arg_parser) # check whether the user provided a value parsed_arg = arg_parser.parse_known_args(args=command_line_args) if not parsed_arg: continue namespace, _ = parsed_arg user_config_file = getattr(namespace, action.dest, None) if not user_config_file: continue # validate the user-provided config file path user_config_file = os.path.expanduser(user_config_file) if not os.path.isfile(user_config_file): self.error('File not found: %s' % user_config_file) config_files += [open(user_config_file)] return config_files def format_values(self): """Returns a string with all args and settings and where they came from (eg. commandline, config file, enviroment variable or default) """ source_key_to_display_value_map = { _COMMAND_LINE_SOURCE_KEY: "Command Line Args: ", _ENV_VAR_SOURCE_KEY: "Environment Variables:\n", _CONFIG_FILE_SOURCE_KEY: "Config File (%s):\n", _DEFAULTS_SOURCE_KEY: "Defaults:\n" } r = StringIO() for source, settings in self._source_to_settings.items(): source = source.split("|") source = source_key_to_display_value_map[source[0]] % tuple(source[1:]) r.write(source) for key, (action, value) in settings.items(): if key: r.write(" %-19s%s\n" % (key+":", value)) else: if type(value) is str: r.write(" %s\n" % value) elif type(value) is list: r.write(" %s\n" % ' '.join(value)) return r.getvalue() def print_values(self, file = sys.stdout): """Prints the format_values() string (to sys.stdout or another file).""" file.write(self.format_values()) def format_help(self): msg = "" added_config_file_help = False added_env_var_help = False if self._add_config_file_help: default_config_files = self._default_config_files cc = 2*self.prefix_chars[0] # eg. -- config_settable_args = [(arg, a) for a in self._actions for arg in a.option_strings if self.get_possible_config_keys(a) and not (a.dest == "help" or a.is_config_file_arg or a.is_write_out_config_file_arg)] config_path_actions = [a for a in self._actions if getattr(a, "is_config_file_arg", False)] if config_settable_args and (default_config_files or config_path_actions): self._add_config_file_help = False # prevent duplication added_config_file_help = True msg += ("Args that start with '%s' (eg. %s) can also be set in " "a config file") % (cc, config_settable_args[0][0]) config_arg_string = " or ".join(a.option_strings[0] for a in config_path_actions if a.option_strings) if config_arg_string: config_arg_string = "specified via " + config_arg_string if default_config_files or config_arg_string: msg += " (%s)." % " or ".join(default_config_files + list(filter(None, [config_arg_string]))) msg += " " + self._config_file_parser.get_syntax_description() if self._add_env_var_help: env_var_actions = [(a.env_var, a) for a in self._actions if getattr(a, "env_var", None)] for env_var, a in env_var_actions: env_var_help_string = " [env var: %s]" % env_var if not a.help: a.help = "" if env_var_help_string not in a.help: a.help += env_var_help_string added_env_var_help = True self._add_env_var_help = False # prevent duplication if added_env_var_help or added_config_file_help: value_sources = ["defaults"] if added_config_file_help: value_sources = ["config file values"] + value_sources if added_env_var_help: value_sources = ["environment variables"] + value_sources msg += (" If an arg is specified in more than one place, then " "commandline values override %s.") % ( " which override ".join(value_sources)) if msg: self.description = (self.description or "") + " " + msg return argparse.ArgumentParser.format_help(self) def add_argument(self, *args, **kwargs): """ This method supports the same args as ArgumentParser.add_argument(..) as well as the additional args below. Additional Args: env_var: If set, the value of this environment variable will override any config file or default values for this arg (but can itself be overriden on the commandline). Also, if auto_env_var_prefix is set in the constructor, this env var name will be used instead of the automatic name. is_config_file_arg: If True, this arg is treated as a config file path This provides an alternative way to specify config files in place of the ArgumentParser(fromfile_prefix_chars=..) mechanism. Default: False is_write_out_config_file_arg: If True, this arg will be treated as a config file path, and, when it is specified, will cause configargparse to write all current commandline args to this file as config options and then exit. Default: False """ env_var = kwargs.pop("env_var", None) is_config_file_arg = kwargs.pop( "is_config_file_arg", None) or kwargs.pop( "is_config_file", None) # for backward compat. is_write_out_config_file_arg = kwargs.pop( "is_write_out_config_file_arg", None) action = self.original_add_argument_method(*args, **kwargs) action.is_positional_arg = not action.option_strings action.env_var = env_var action.is_config_file_arg = is_config_file_arg action.is_write_out_config_file_arg = is_write_out_config_file_arg if action.is_positional_arg and env_var: raise ValueError("env_var can't be set for a positional arg.") if action.is_config_file_arg and type(action) != argparse._StoreAction: raise ValueError("arg with is_config_file_arg=True must have " "action='store'") if action.is_write_out_config_file_arg: error_prefix = "arg with is_write_out_config_file_arg=True " if type(action) != argparse._StoreAction: raise ValueError(error_prefix + "must have action='store'") if is_config_file_arg: raise ValueError(error_prefix + "can't also have " "is_config_file_arg=True") return action def already_on_command_line(existing_args_list, potential_command_line_args): """Utility method for checking if any of the potential_command_line_args is already present in existing_args. """ return any(potential_arg in existing_args_list for potential_arg in potential_command_line_args) # wrap ArgumentParser's add_argument(..) method with the one above argparse._ActionsContainer.original_add_argument_method = argparse._ActionsContainer.add_argument argparse._ActionsContainer.add_argument = add_argument # add all public classes and constants from argparse module's namespace to this # module's namespace so that the 2 modules are truly interchangeable HelpFormatter = argparse.HelpFormatter RawDescriptionHelpFormatter = argparse.RawDescriptionHelpFormatter RawTextHelpFormatter = argparse.RawTextHelpFormatter ArgumentDefaultsHelpFormatter = argparse.ArgumentDefaultsHelpFormatter ArgumentError = argparse.ArgumentError ArgumentTypeError = argparse.ArgumentTypeError Action = argparse.Action FileType = argparse.FileType Namespace = argparse.Namespace ONE_OR_MORE = argparse.ONE_OR_MORE OPTIONAL = argparse.OPTIONAL REMAINDER = argparse.REMAINDER SUPPRESS = argparse.SUPPRESS ZERO_OR_MORE = argparse.ZERO_OR_MORE # deprecated PEP-8 incompatible API names. initArgumentParser = init_argument_parser getArgumentParser = get_argument_parser getArgParser = get_argument_parser getParser = get_argument_parser # create shorter aliases for the key methods and class names get_arg_parser = get_argument_parser get_parser = get_argument_parser ArgParser = ArgumentParser Parser = ArgumentParser argparse._ActionsContainer.add_arg = argparse._ActionsContainer.add_argument argparse._ActionsContainer.add = argparse._ActionsContainer.add_argument ArgumentParser.parse = ArgumentParser.parse_args ArgumentParser.parse_known = ArgumentParser.parse_known_args RawFormatter = RawDescriptionHelpFormatter DefaultsFormatter = ArgumentDefaultsHelpFormatter DefaultsRawFormatter = ArgumentDefaultsRawHelpFormatter