erlang-rebar/rebar-0003-Remove-bundled-getopt.patch

From 42fac65535e6cc260e39cd7594ac7de28129f76b Mon Sep 17 00:00:00 2001
From: Filip Andres <filip@andresovi.net>
Date: Fri, 3 Jul 2015 10:56:26 +0200
Subject: [PATCH] Remove bundled getopt

---
 ebin/rebar.app       |   1 -
 src/rebar.erl        |   4 +-
 src/rebar_getopt.erl | 914 ---------------------------------------------------
 3 files changed, 2 insertions(+), 917 deletions(-)
 delete mode 100644 src/rebar_getopt.erl

diff --git a/ebin/rebar.app b/ebin/rebar.app
index 8a65fc8..2d2a0e7 100644
--- a/ebin/rebar.app
+++ b/ebin/rebar.app
@@ -43,7 +43,6 @@
               rebar_utils,
               rebar_xref,
               rebar_metacmds,
-              rebar_getopt,
               rmemo ]},
   {registered, []},
   {applications,
diff --git a/src/rebar.erl b/src/rebar.erl
index dcfb353..2040e7a 100644
--- a/src/rebar.erl
+++ b/src/rebar.erl
@@ -233,7 +233,7 @@ run_aux(BaseConfig, Commands) ->
 %%
 help() ->
     OptSpecList = option_spec_list(),
-    rebar_getopt:usage(OptSpecList, "rebar",
+    getopt:usage(OptSpecList, "rebar",
                        "[var=value,...] <command,...>",
                        [{"var=value", "rebar global variables (e.g. force=1)"},
                         {"command", "Command to run (e.g. compile)"}]),
@@ -293,7 +293,7 @@ help() ->
 parse_args(RawArgs) ->
     %% Parse getopt options
     OptSpecList = option_spec_list(),
-    case rebar_getopt:parse(OptSpecList, RawArgs) of
+    case getopt:parse(OptSpecList, RawArgs) of
         {ok, Args} ->
             Args;
         {error, {Reason, Data}} ->
diff --git a/src/rebar_getopt.erl b/src/rebar_getopt.erl
deleted file mode 100644
index 79b871d..0000000
--- a/src/rebar_getopt.erl
+++ /dev/null
@@ -1,914 +0,0 @@
-%%%-------------------------------------------------------------------
-%%% @author Juan Jose Comellas <juanjo@comellas.org>
-%%% @copyright (C) 2009 Juan Jose Comellas
-%%% @doc Parses command line options with a format similar to that of GNU getopt.
-%%% @end
-%%%
-%%% This source file is subject to the New BSD License. You should have received
-%%% a copy of the New BSD license with this software. If not, it can be
-%%% retrieved from: http://www.opensource.org/licenses/bsd-license.php
-%%%-------------------------------------------------------------------
--module(rebar_getopt).
--author('juanjo@comellas.org').
-
--export([parse/2, check/2, parse_and_check/2, format_error/2,
-         usage/2, usage/3, usage/4, tokenize/1]).
--export([usage_cmd_line/2]).
-
--define(LINE_LENGTH, 75).
--define(MIN_USAGE_COMMAND_LINE_OPTION_LENGTH, 25).
-
-%% Position of each field in the option specification tuple.
--define(OPT_NAME, 1).
--define(OPT_SHORT, 2).
--define(OPT_LONG, 3).
--define(OPT_ARG, 4).
--define(OPT_HELP, 5).
-
--define(IS_OPT_SPEC(Opt), (tuple_size(Opt) =:= ?OPT_HELP)).
--define(IS_WHITESPACE(Char), ((Char) =:= $\s orelse (Char) =:= $\t orelse
-                              (Char) =:= $\n orelse (Char) =:= $\r)).
-
-%% Atom indicating the data type that an argument can be converted to.
--type arg_type()                                :: 'atom' | 'binary' | 'boolean' | 'float' | 'integer' | 'string'.
-%% Data type that an argument can be converted to.
--type arg_value()                               :: atom() | binary() | boolean() | float() | integer() | string().
-%% Argument specification.
--type arg_spec()                                :: arg_type() | {arg_type(), arg_value()} | undefined.
-%% Option type and optional default argument.
--type simple_option()                           :: atom().
--type compound_option()                         :: {atom(), arg_value()}.
--type option()                                  :: simple_option() | compound_option().
-%% Command line option specification.
--type option_spec() :: {
-                   Name                         :: atom(),
-                   Short                        :: char() | undefined,
-                   Long                         :: string() | undefined,
-                   ArgSpec                      :: arg_spec(),
-                   Help                         :: string() | undefined
-                  }.
-%% Output streams
--type output_stream()                           :: 'standard_io' | 'standard_error'.
-
-%% For internal use
--type usage_line()                              :: {OptionText :: string(), HelpText :: string()}.
--type usage_line_with_length()                  :: {OptionLength :: non_neg_integer(), OptionText :: string(), HelpText :: string()}.
-
-
--export_type([arg_type/0, arg_value/0, arg_spec/0, simple_option/0, compound_option/0, option/0, option_spec/0]).
-
-
-%% @doc Parse the command line options and arguments returning a list of tuples
-%%      and/or atoms using the Erlang convention for sending options to a
-%%      function.  Additionally perform check if all required options (the ones
-%%      without default values) are present.  The function is a combination of
-%%      two calls: parse/2 and check/2.
--spec parse_and_check([option_spec()], string() | [string()]) ->
-                {ok, {[option()], [string()]}} | {error, {Reason :: atom(), Data :: term()}}.
-parse_and_check(OptSpecList, CmdLine) when is_list(OptSpecList), is_list(CmdLine) ->
-    case parse(OptSpecList, CmdLine) of
-        {ok, {Opts, _}} = Result ->
-            case check(OptSpecList, Opts) of
-                ok    -> Result;
-                Error -> Error
-            end;
-        Error ->
-            Error
-    end.
-
-%% @doc Check the parsed command line arguments returning ok if all required
-%%      options (i.e. that don't have defaults) are present, and returning
-%%      error otherwise.
--spec check([option_spec()], [option()]) ->
-                ok | {error, {Reason :: atom(), Option :: atom()}}.
-check(OptSpecList, ParsedOpts) when is_list(OptSpecList), is_list(ParsedOpts) ->
-    try
-        RequiredOpts = [Name || {Name, _, _, Arg, _} <- OptSpecList,
-                                not is_tuple(Arg) andalso Arg =/= undefined],
-        lists:foreach(fun (Option) ->
-            case proplists:is_defined(Option, ParsedOpts) of
-                true ->
-                    ok;
-                false ->
-                    throw({error, {missing_required_option, Option}})
-            end
-        end, RequiredOpts)
-    catch
-        _:Error ->
-            Error
-    end.
-
-
-%% @doc Parse the command line options and arguments returning a list of tuples
-%%      and/or atoms using the Erlang convention for sending options to a
-%%      function.
--spec parse([option_spec()], string() | [string()]) ->
-                   {ok, {[option()], [string()]}} | {error, {Reason :: atom(), Data :: term()}}.
-parse(OptSpecList, CmdLine) when is_list(CmdLine) ->
-    try
-        Args = if
-                   is_integer(hd(CmdLine)) -> tokenize(CmdLine);
-                   true                    -> CmdLine
-               end,
-        parse(OptSpecList, [], [], 0, Args)
-    catch
-        throw: {error, {_Reason, _Data}} = Error ->
-            Error
-    end.
-
-
--spec parse([option_spec()], [option()], [string()], integer(), [string()]) ->
-                   {ok, {[option()], [string()]}}.
-%% Process the option terminator.
-parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, ["--" | Tail]) ->
-    %% Any argument present after the terminator is not considered an option.
-    {ok, {lists:reverse(append_default_options(OptSpecList, OptAcc)), lists:reverse(ArgAcc, Tail)}};
-%% Process long options.
-parse(OptSpecList, OptAcc, ArgAcc, ArgPos, ["--" ++ OptArg = OptStr | Tail]) ->
-    parse_long_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg);
-%% Process short options.
-parse(OptSpecList, OptAcc, ArgAcc, ArgPos, ["-" ++ ([_Char | _] = OptArg) = OptStr | Tail]) ->
-    parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Tail, OptStr, OptArg);
-%% Process non-option arguments.
-parse(OptSpecList, OptAcc, ArgAcc, ArgPos, [Arg | Tail]) ->
-    case find_non_option_arg(OptSpecList, ArgPos) of
-        {value, OptSpec} when ?IS_OPT_SPEC(OptSpec) ->
-            parse(OptSpecList, add_option_with_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos + 1, Tail);
-        false ->
-            parse(OptSpecList, OptAcc, [Arg | ArgAcc], ArgPos, Tail)
-    end;
-parse(OptSpecList, OptAcc, ArgAcc, _ArgPos, []) ->
-    %% Once we have completed gathering the options we add the ones that were
-    %% not present but had default arguments in the specification.
-    {ok, {lists:reverse(append_default_options(OptSpecList, OptAcc)), lists:reverse(ArgAcc)}}.
-
-
-%% @doc Format the error code returned by prior call to parse/2 or check/2.
--spec format_error([option_spec()], {error, {Reason :: atom(), Data :: term()}} |
-                   {Reason :: term(), Data :: term()}) -> string().
-format_error(OptSpecList, {error, Reason}) ->
-    format_error(OptSpecList, Reason);
-format_error(OptSpecList, {missing_required_option, Name}) ->
-    {_Name, Short, Long, _Type, _Help} = lists:keyfind(Name, 1, OptSpecList),
-    lists:flatten(["missing required option: -", [Short], " (", to_string(Long), ")"]);
-format_error(_OptSpecList, {invalid_option, OptStr}) ->
-    lists:flatten(["invalid option: ", to_string(OptStr)]);
-format_error(_OptSpecList, {invalid_option_arg, {Name, Arg}}) ->
-    lists:flatten(["option \'", to_string(Name) ++ "\' has invalid argument: ", to_string(Arg)]);
-format_error(_OptSpecList, {invalid_option_arg, OptStr}) ->
-    lists:flatten(["invalid option argument: ", to_string(OptStr)]);
-format_error(_OptSpecList, {Reason, Data}) ->
-    lists:flatten([to_string(Reason), " ", to_string(Data)]).
-
-
-%% @doc Parse a long option, add it to the option accumulator and continue
-%%      parsing the rest of the arguments recursively.
-%%      A long option can have the following syntax:
-%%        --foo      Single option 'foo', no argument
-%%        --foo=bar  Single option 'foo', argument "bar"
-%%        --foo bar  Single option 'foo', argument "bar"
--spec parse_long_option([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
-                               {ok, {[option()], [string()]}}.
-parse_long_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
-    case split_assigned_arg(OptArg) of
-        {Long, Arg} ->
-            %% Get option that has its argument within the same string
-            %% separated by an equal ('=') character (e.g. "--port=1000").
-            parse_long_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Long, Arg);
-
-        Long ->
-            case lists:keyfind(Long, ?OPT_LONG, OptSpecList) of
-                {Name, _Short, Long, undefined, _Help} ->
-                    parse(OptSpecList, [Name | OptAcc], ArgAcc, ArgPos, Args);
-
-                {_Name, _Short, Long, _ArgSpec, _Help} = OptSpec ->
-                    %% The option argument string is empty, but the option requires
-                    %% an argument, so we look into the next string in the list.
-                    %% e.g ["--port", "1000"]
-                    parse_long_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptSpec);
-                false ->
-                    throw({error, {invalid_option, OptStr}})
-            end
-    end.
-
-
-%% @doc Parse an option where the argument is 'assigned' in the same string using
-%%      the '=' character, add it to the option accumulator and continue parsing the
-%%      rest of the arguments recursively. This syntax is only valid for long options.
--spec parse_long_option_assigned_arg([option_spec()], [option()], [string()], integer(),
-                                     [string()], string(), string(), string()) ->
-                                            {ok, {[option()], [string()]}}.
-parse_long_option_assigned_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, Long, Arg) ->
-    case lists:keyfind(Long, ?OPT_LONG, OptSpecList) of
-        {_Name, _Short, Long, ArgSpec, _Help} = OptSpec ->
-            case ArgSpec of
-                undefined ->
-                    throw({error, {invalid_option_arg, OptStr}});
-                _ ->
-                    parse(OptSpecList, add_option_with_assigned_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos, Args)
-            end;
-        false ->
-            throw({error, {invalid_option, OptStr}})
-    end.
-
-
-%% @doc Split an option string that may contain an option with its argument
-%%      separated by an equal ('=') character (e.g. "port=1000").
--spec split_assigned_arg(string()) -> {Name :: string(), Arg :: string()} | string().
-split_assigned_arg(OptStr) ->
-    split_assigned_arg(OptStr, OptStr, []).
-
-split_assigned_arg(_OptStr, "=" ++ Tail, Acc) ->
-    {lists:reverse(Acc), Tail};
-split_assigned_arg(OptStr, [Char | Tail], Acc) ->
-    split_assigned_arg(OptStr, Tail, [Char | Acc]);
-split_assigned_arg(OptStr, [], _Acc) ->
-    OptStr.
-
-
-%% @doc Retrieve the argument for an option from the next string in the list of
-%%      command-line parameters or set the value of the argument from the argument
-%%      specification (for boolean and integer arguments), if possible.
-parse_long_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, {Name, _Short, _Long, ArgSpec, _Help} = OptSpec) ->
-    ArgSpecType = arg_spec_type(ArgSpec),
-    case Args =:= [] orelse is_implicit_arg(ArgSpecType, hd(Args)) of
-        true ->
-            parse(OptSpecList, add_option_with_implicit_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args);
-        false ->
-            [Arg | Tail] = Args,
-            try
-                parse(OptSpecList, [{Name, to_type(ArgSpecType, Arg)} | OptAcc], ArgAcc, ArgPos, Tail)
-            catch
-                error:_ ->
-                    throw({error, {invalid_option_arg, {Name, Arg}}})
-            end
-    end.
-
-
-%% @doc Parse a short option, add it to the option accumulator and continue
-%%      parsing the rest of the arguments recursively.
-%%      A short option can have the following syntax:
-%%        -a       Single option 'a', no argument or implicit boolean argument
-%%        -a foo   Single option 'a', argument "foo"
-%%        -afoo    Single option 'a', argument "foo"
-%%        -abc     Multiple options: 'a'; 'b'; 'c'
-%%        -bcafoo  Multiple options: 'b'; 'c'; 'a' with argument "foo"
-%%        -aaa     Multiple repetitions of option 'a' (only valid for options with integer arguments)
--spec parse_short_option([option_spec()], [option()], [string()], integer(), [string()], string(), string()) ->
-                                {ok, {[option()], [string()]}}.
-parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptArg) ->
-    parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, first, OptArg).
-
-parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptStr, OptPos, [Short | Arg]) ->
-    case lists:keyfind(Short, ?OPT_SHORT, OptSpecList) of
-        {Name, Short, _Long, undefined, _Help} ->
-            parse_short_option(OptSpecList, [Name | OptAcc], ArgAcc, ArgPos, Args, OptStr, first, Arg);
-
-        {_Name, Short, _Long, ArgSpec, _Help} = OptSpec ->
-            %% The option has a specification, so it requires an argument.
-            case Arg of
-                [] ->
-                    %% The option argument string is empty, but the option requires
-                    %% an argument, so we look into the next string in the list.
-                    parse_short_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, OptSpec, OptPos);
-
-                _ ->
-                    case is_valid_arg(ArgSpec, Arg) of
-                        true ->
-                            parse(OptSpecList, add_option_with_arg(OptSpec, Arg, OptAcc), ArgAcc, ArgPos, Args);
-                        _ ->
-                            NewOptAcc = case OptPos of
-                                            first -> add_option_with_implicit_arg(OptSpec, OptAcc);
-                                            _     -> add_option_with_implicit_incrementable_arg(OptSpec, OptAcc)
-                                        end,
-                            parse_short_option(OptSpecList, NewOptAcc, ArgAcc, ArgPos, Args, OptStr, next, Arg)
-                    end
-            end;
-
-        false ->
-            throw({error, {invalid_option, OptStr}})
-    end;
-parse_short_option(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, _OptStr, _OptPos, []) ->
-    parse(OptSpecList, OptAcc, ArgAcc, ArgPos, Args).
-
-
-%% @doc Retrieve the argument for an option from the next string in the list of
-%%      command-line parameters or set the value of the argument from the argument
-%%      specification (for boolean and integer arguments), if possible.
-parse_short_option_next_arg(OptSpecList, OptAcc, ArgAcc, ArgPos, Args, {Name, _Short, _Long, ArgSpec, _Help} = OptSpec, OptPos) ->
-    case Args =:= [] orelse is_implicit_arg(ArgSpec, hd(Args)) of
-        true when OptPos =:= first ->
-            parse(OptSpecList, add_option_with_implicit_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args);
-        true ->
-            parse(OptSpecList, add_option_with_implicit_incrementable_arg(OptSpec, OptAcc), ArgAcc, ArgPos, Args);
-        false ->
-            [Arg | Tail] = Args,
-            try
-                parse(OptSpecList, [{Name, to_type(ArgSpec, Arg)} | OptAcc], ArgAcc, ArgPos, Tail)
-            catch
-                error:_ ->
-                    throw({error, {invalid_option_arg, {Name, Arg}}})
-            end
-    end.
-
-
-%% @doc Find the option for the discrete argument in position specified in the
-%%      Pos argument.
--spec find_non_option_arg([option_spec()], integer()) -> {value, option_spec()} | false.
-find_non_option_arg([{_Name, undefined, undefined, _ArgSpec, _Help} = OptSpec | _Tail], 0) ->
-    {value, OptSpec};
-find_non_option_arg([{_Name, undefined, undefined, _ArgSpec, _Help} | Tail], Pos) ->
-    find_non_option_arg(Tail, Pos - 1);
-find_non_option_arg([_Head | Tail], Pos) ->
-    find_non_option_arg(Tail, Pos);
-find_non_option_arg([], _Pos) ->
-    false.
-
-
-%% @doc Append options that were not present in the command line arguments with
-%%      their default arguments.
--spec append_default_options([option_spec()], [option()]) -> [option()].
-append_default_options([{Name, _Short, _Long, {_Type, DefaultArg}, _Help} | Tail], OptAcc) ->
-    append_default_options(Tail,
-                           case lists:keymember(Name, 1, OptAcc) of
-                               false ->
-                                   [{Name, DefaultArg} | OptAcc];
-                               _ ->
-                                   OptAcc
-                           end);
-%% For options with no default argument.
-append_default_options([_Head | Tail], OptAcc) ->
-    append_default_options(Tail, OptAcc);
-append_default_options([], OptAcc) ->
-    OptAcc.
-
-
-%% @doc Add an option with argument converting it to the data type indicated by the
-%%      argument specification.
--spec add_option_with_arg(option_spec(), string(), [option()]) -> [option()].
-add_option_with_arg({Name, _Short, _Long, ArgSpec, _Help} = OptSpec, Arg, OptAcc) ->
-    case is_valid_arg(ArgSpec, Arg) of
-        true ->
-            try
-                [{Name, to_type(ArgSpec, Arg)} | OptAcc]
-            catch
-                error:_ ->
-                    throw({error, {invalid_option_arg, {Name, Arg}}})
-            end;
-        false ->
-            add_option_with_implicit_arg(OptSpec, OptAcc)
-    end.
-
-
-%% @doc Add an option with argument that was part of an assignment expression
-%%      (e.g. "--verbose=3") converting it to the data type indicated by the
-%%      argument specification.
--spec add_option_with_assigned_arg(option_spec(), string(), [option()]) -> [option()].
-add_option_with_assigned_arg({Name, _Short, _Long, ArgSpec, _Help}, Arg, OptAcc) ->
-    try
-        [{Name, to_type(ArgSpec, Arg)} | OptAcc]
-    catch
-        error:_ ->
-            throw({error, {invalid_option_arg, {Name, Arg}}})
-    end.
-
-
-%% @doc Add an option that required an argument but did not have one. Some data
-%%      types (boolean, integer) allow implicit or assumed arguments.
--spec add_option_with_implicit_arg(option_spec(), [option()]) -> [option()].
-add_option_with_implicit_arg({Name, _Short, _Long, ArgSpec, _Help}, OptAcc) ->
-    case arg_spec_type(ArgSpec) of
-        boolean ->
-            %% Special case for boolean arguments: if there is no argument we
-            %% set the value to 'true'.
-            [{Name, true} | OptAcc];
-        integer ->
-            %% Special case for integer arguments: if the option had not been set
-            %% before we set the value to 1. This is needed to support options like
-            %% "-v" to return something like {verbose, 1}.
-            [{Name, 1} | OptAcc];
-        _ ->
-            throw({error, {missing_option_arg, Name}})
-    end.
-
-
-%% @doc Add an option with an implicit or assumed argument.
--spec add_option_with_implicit_incrementable_arg(option_spec() | arg_spec(), [option()]) -> [option()].
-add_option_with_implicit_incrementable_arg({Name, _Short, _Long, ArgSpec, _Help}, OptAcc) ->
-    case arg_spec_type(ArgSpec) of
-        boolean ->
-            %% Special case for boolean arguments: if there is no argument we
-            %% set the value to 'true'.
-            [{Name, true} | OptAcc];
-        integer ->
-            %% Special case for integer arguments: if the option had not been set
-            %% before we set the value to 1; if not we increment the previous value
-            %% the option had. This is needed to support options like "-vvv" to
-            %% return something like {verbose, 3}.
-            case OptAcc of
-                [{Name, Count} | Tail] ->
-                    [{Name, Count + 1} | Tail];
-                _ ->
-                    [{Name, 1} | OptAcc]
-            end;
-        _ ->
-            throw({error, {missing_option_arg, Name}})
-    end.
-
-
-%% @doc Retrieve the data type form an argument specification.
--spec arg_spec_type(arg_spec()) -> arg_type() | undefined.
-arg_spec_type({Type, _DefaultArg}) ->
-    Type;
-arg_spec_type(Type) when is_atom(Type) ->
-    Type.
-
-
-%% @doc Convert an argument string to its corresponding data type.
--spec to_type(arg_spec() | arg_type(), string()) -> arg_value().
-to_type({Type, _DefaultArg}, Arg) ->
-    to_type(Type, Arg);
-to_type(binary, Arg) ->
-    list_to_binary(Arg);
-to_type(atom, Arg) ->
-    list_to_atom(Arg);
-to_type(integer, Arg) ->
-    list_to_integer(Arg);
-to_type(float, Arg) ->
-    list_to_float(Arg);
-to_type(boolean, Arg) ->
-    LowerArg = string:to_lower(Arg),
-    case is_arg_true(LowerArg) of
-        true ->
-            true;
-        _ ->
-            case is_arg_false(LowerArg) of
-                true ->
-                    false;
-                false ->
-                    erlang:error(badarg)
-            end
-    end;
-to_type(_Type, Arg) ->
-    Arg.
-
-
--spec is_arg_true(string()) -> boolean().
-is_arg_true(Arg) ->
-    (Arg =:= "true") orelse (Arg =:= "t") orelse
-    (Arg =:= "yes") orelse (Arg =:= "y") orelse
-    (Arg =:= "on") orelse (Arg =:= "enabled") orelse
-    (Arg =:= "1").
-
-
--spec is_arg_false(string()) -> boolean().
-is_arg_false(Arg) ->
-    (Arg =:= "false") orelse (Arg =:= "f") orelse
-    (Arg =:= "no") orelse (Arg =:= "n") orelse
-    (Arg =:= "off") orelse (Arg =:= "disabled") orelse
-    (Arg =:= "0").
-
-
--spec is_valid_arg(arg_spec(), nonempty_string()) -> boolean().
-is_valid_arg({Type, _DefaultArg}, Arg) ->
-    is_valid_arg(Type, Arg);
-is_valid_arg(boolean, Arg) ->
-    is_boolean_arg(Arg);
-is_valid_arg(integer, Arg) ->
-    is_non_neg_integer_arg(Arg);
-is_valid_arg(float, Arg) ->
-    is_non_neg_float_arg(Arg);
-is_valid_arg(_Type, _Arg) ->
-    true.
-
-
--spec is_implicit_arg(arg_spec(), nonempty_string()) -> boolean().
-is_implicit_arg({Type, _DefaultArg}, Arg) ->
-    is_implicit_arg(Type, Arg);
-is_implicit_arg(boolean, Arg) ->
-    not is_boolean_arg(Arg);
-is_implicit_arg(integer, Arg) ->
-    not is_integer_arg(Arg);
-is_implicit_arg(_Type, _Arg) ->
-    false.
-
-
--spec is_boolean_arg(string()) -> boolean().
-is_boolean_arg(Arg) ->
-    LowerArg = string:to_lower(Arg),
-    is_arg_true(LowerArg) orelse is_arg_false(LowerArg).
-
-
--spec is_integer_arg(string()) -> boolean().
-is_integer_arg("-" ++ Tail) ->
-    is_non_neg_integer_arg(Tail);
-is_integer_arg(Arg) ->
-    is_non_neg_integer_arg(Arg).
-
-
--spec is_non_neg_integer_arg(string()) -> boolean().
-is_non_neg_integer_arg([Head | Tail]) when Head >= $0, Head =< $9 ->
-    is_non_neg_integer_arg(Tail);
-is_non_neg_integer_arg([_Head | _Tail]) ->
-    false;
-is_non_neg_integer_arg([]) ->
-    true.
-
-
--spec is_non_neg_float_arg(string()) -> boolean().
-is_non_neg_float_arg([Head | Tail]) when (Head >= $0 andalso Head =< $9) orelse Head =:= $. ->
-    is_non_neg_float_arg(Tail);
-is_non_neg_float_arg([_Head | _Tail]) ->
-    false;
-is_non_neg_float_arg([]) ->
-    true.
-
-
-%% @doc  Show a message on standard_error indicating the command line options and
-%%       arguments that are supported by the program.
--spec usage([option_spec()], string()) -> ok.
-usage(OptSpecList, ProgramName) ->
-    usage(OptSpecList, ProgramName, standard_error).
-
-
-%% @doc  Show a message on standard_error or standard_io indicating the command line options and
-%%       arguments that are supported by the program.
--spec usage([option_spec()], string(), output_stream() | string()) -> ok.
-usage(OptSpecList, ProgramName, OutputStream) when is_atom(OutputStream) ->
-    io:format(OutputStream, "~s~n~n~s~n",
-              [usage_cmd_line(ProgramName, OptSpecList), usage_options(OptSpecList)]);
-%% @doc  Show a message on standard_error indicating the command line options and
-%%       arguments that are supported by the program. The CmdLineTail argument
-%%       is a string that is added to the end of the usage command line.
-usage(OptSpecList, ProgramName, CmdLineTail) ->
-    usage(OptSpecList, ProgramName, CmdLineTail, standard_error).
-
-
-%% @doc  Show a message on standard_error or standard_io indicating the command line options and
-%%       arguments that are supported by the program. The CmdLineTail argument
-%%       is a string that is added to the end of the usage command line.
--spec usage([option_spec()], ProgramName :: string(), CmdLineTail :: string(), output_stream() | [{string(), string()}]) -> ok.
-usage(OptSpecList, ProgramName, CmdLineTail, OutputStream) when is_atom(OutputStream) ->
-    io:format(OutputStream, "~s~n~n~s~n",
-              [usage_cmd_line(ProgramName, OptSpecList, CmdLineTail), usage_options(OptSpecList)]);
-%% @doc  Show a message on standard_error indicating the command line options and
-%%       arguments that are supported by the program. The CmdLineTail and OptionsTail
-%%       arguments are a string that is added to the end of the usage command line
-%%       and a list of tuples that are added to the end of the options' help lines.
-usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail) ->
-    usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail, standard_error).
-
-
-%% @doc  Show a message on standard_error or standard_io indicating the command line options and
-%%       arguments that are supported by the program. The CmdLineTail and OptionsTail
-%%       arguments are a string that is added to the end of the usage command line
-%%       and a list of tuples that are added to the end of the options' help lines.
--spec usage([option_spec()], ProgramName :: string(), CmdLineTail :: string(),
-            [{OptionName :: string(), Help :: string()}], output_stream()) -> ok.
-usage(OptSpecList, ProgramName, CmdLineTail, OptionsTail, OutputStream) ->
-    io:format(OutputStream, "~s~n~n~s~n",
-              [usage_cmd_line(ProgramName, OptSpecList, CmdLineTail), usage_options(OptSpecList, OptionsTail)]).
-
-
--spec usage_cmd_line(ProgramName :: string(), [option_spec()]) -> iolist().
-usage_cmd_line(ProgramName, OptSpecList) ->
-    usage_cmd_line(ProgramName, OptSpecList, "").
-
--spec usage_cmd_line(ProgramName :: string(), [option_spec()], CmdLineTail :: string()) -> iolist().
-usage_cmd_line(ProgramName, OptSpecList, CmdLineTail) ->
-    Prefix = "Usage: " ++ ProgramName,
-    PrefixLength = length(Prefix),
-    LineLength = line_length(),
-    %% Only align the command line options after the program name when there is
-    %% enough room to do so (i.e. at least 25 characters). If not, show the
-    %% command line options below the program name with a 2-character indentation.
-    if
-        (LineLength - PrefixLength) > ?MIN_USAGE_COMMAND_LINE_OPTION_LENGTH ->
-            Indentation = lists:duplicate(PrefixLength, $\s),
-            [FirstOptLine | OptLines] = usage_cmd_line_options(LineLength - PrefixLength, OptSpecList, CmdLineTail),
-            IndentedOptLines = [[Indentation | OptLine] || OptLine <- OptLines],
-            [Prefix, FirstOptLine | IndentedOptLines];
-        true ->
-            IndentedOptLines = [[" " | OptLine] || OptLine <- usage_cmd_line_options(LineLength, OptSpecList, CmdLineTail)],
-            [Prefix, $\n, IndentedOptLines]
-    end.
-
-
-%% @doc Return a list of the lines corresponding to the usage command line
-%%      already wrapped according to the maximum MaxLineLength.
--spec usage_cmd_line_options(MaxLineLength :: non_neg_integer(), [option_spec()], CmdLineTail :: string()) -> iolist().
-usage_cmd_line_options(MaxLineLength, OptSpecList, CmdLineTail) ->
-    usage_cmd_line_options(MaxLineLength, OptSpecList ++ string:tokens(CmdLineTail, " "), [], 0, []).
-
-usage_cmd_line_options(MaxLineLength, [OptSpec | Tail], LineAcc, LineAccLength, Acc) ->
-    Option = [$\s | lists:flatten(usage_cmd_line_option(OptSpec))],
-    OptionLength = length(Option),
-    %% We accumulate the options in LineAcc until its length is over the
-    %% maximum allowed line length. When that happens, we append the line in
-    %% LineAcc to the list with all the lines in the command line (Acc).
-    NewLineAccLength = LineAccLength + OptionLength,
-    if
-        NewLineAccLength < MaxLineLength ->
-            usage_cmd_line_options(MaxLineLength, Tail, [Option | LineAcc], NewLineAccLength, Acc);
-        true ->
-            usage_cmd_line_options(MaxLineLength, Tail, [Option], OptionLength + 1,
-                                   [lists:reverse([$\n | LineAcc]) | Acc])
-    end;
-usage_cmd_line_options(MaxLineLength, [], [_ | _] = LineAcc, _LineAccLength, Acc) ->
-    %% If there was a non-empty line in LineAcc when there are no more options
-    %% to process, we add it to the list of lines to return.
-    usage_cmd_line_options(MaxLineLength, [], [], 0, [lists:reverse(LineAcc) | Acc]);
-usage_cmd_line_options(_MaxLineLength, [], [], _LineAccLength, Acc) ->
-    lists:reverse(Acc).
-
-
--spec usage_cmd_line_option(option_spec()) -> string().
-usage_cmd_line_option({_Name, Short, _Long, undefined, _Help}) when Short =/= undefined ->
-    %% For options with short form and no argument.
-    [$[, $-, Short, $]];
-usage_cmd_line_option({_Name, _Short, Long, undefined, _Help}) when Long =/= undefined ->
-    %% For options with only long form and no argument.
-    [$[, $-, $-, Long, $]];
-usage_cmd_line_option({_Name, _Short, _Long, undefined, _Help}) ->
-    [];
-usage_cmd_line_option({Name, Short, Long, ArgSpec, _Help}) when is_atom(ArgSpec) ->
-    %% For options with no default argument.
-    if
-        %% For options with short form and argument.
-        Short =/= undefined -> [$[, $-, Short, $\s, $<, atom_to_list(Name), $>, $]];
-        %% For options with only long form and argument.
-        Long =/= undefined  -> [$[, $-, $-, Long, $\s, $<, atom_to_list(Name), $>, $]];
-        %% For options with neither short nor long form and argument.
-        true                -> [$[, $<, atom_to_list(Name), $>, $]]
-    end;
-usage_cmd_line_option({Name, Short, Long, ArgSpec, _Help}) when is_tuple(ArgSpec) ->
-    %% For options with default argument.
-    if
-        %% For options with short form and default argument.
-        Short =/= undefined -> [$[, $-, Short, $\s, $[, $<, atom_to_list(Name), $>, $], $]];
-        %% For options with only long form and default argument.
-        Long =/= undefined  -> [$[, $-, $-, Long, $\s, $[, $<, atom_to_list(Name), $>, $], $]];
-        %% For options with neither short nor long form and default argument.
-        true                -> [$[, $<, atom_to_list(Name), $>, $]]
-    end;
-usage_cmd_line_option(Option) when is_list(Option) ->
-    %% For custom options that are added to the command line.
-    Option.
-
-
-%% @doc Return a list of help messages to print for each of the options and arguments.
--spec usage_options([option_spec()]) -> [string()].
-usage_options(OptSpecList) ->
-    usage_options(OptSpecList, []).
-
-
-%% @doc Return a list of usage lines to print for each of the options and arguments.
--spec usage_options([option_spec()], [{OptionName :: string(), Help :: string()}]) -> [string()].
-usage_options(OptSpecList, CustomHelp) ->
-    %% Add the usage lines corresponding to the option specifications.
-    {MaxOptionLength0, UsageLines0} = add_option_spec_help_lines(OptSpecList, 0, []),
-    %% Add the custom usage lines.
-    {MaxOptionLength, UsageLines} = add_custom_help_lines(CustomHelp, MaxOptionLength0, UsageLines0),
-    MaxLineLength = line_length(),
-    lists:reverse([format_usage_line(MaxOptionLength + 1, MaxLineLength, UsageLine) || UsageLine <- UsageLines]).
-
-
--spec add_option_spec_help_lines([option_spec()], PrevMaxOptionLength :: non_neg_integer(), [usage_line_with_length()]) ->
-                                        {MaxOptionLength :: non_neg_integer(), [usage_line_with_length()]}.
-add_option_spec_help_lines([OptSpec | Tail], PrevMaxOptionLength, Acc) ->
-    OptionText = usage_option_text(OptSpec),
-    HelpText = usage_help_text(OptSpec),
-    {MaxOptionLength, ColsWithLength} = get_max_option_length({OptionText, HelpText}, PrevMaxOptionLength),
-    add_option_spec_help_lines(Tail, MaxOptionLength, [ColsWithLength | Acc]);
-add_option_spec_help_lines([], MaxOptionLength, Acc) ->
-    {MaxOptionLength, Acc}.
-
-
--spec add_custom_help_lines([usage_line()], PrevMaxOptionLength :: non_neg_integer(), [usage_line_with_length()]) ->
-                                   {MaxOptionLength :: non_neg_integer(), [usage_line_with_length()]}.
-add_custom_help_lines([CustomCols | Tail], PrevMaxOptionLength, Acc) ->
-    {MaxOptionLength, ColsWithLength} = get_max_option_length(CustomCols, PrevMaxOptionLength),
-    add_custom_help_lines(Tail, MaxOptionLength, [ColsWithLength | Acc]);
-add_custom_help_lines([], MaxOptionLength, Acc) ->
-    {MaxOptionLength, Acc}.
-
-
--spec usage_option_text(option_spec()) -> string().
-usage_option_text({Name, undefined, undefined, _ArgSpec, _Help}) ->
-    %% Neither short nor long form (non-option argument).
-    "<" ++ atom_to_list(Name) ++ ">";
-usage_option_text({_Name, Short, undefined, _ArgSpec, _Help}) ->
-    %% Only short form.
-    [$-, Short];
-usage_option_text({_Name, undefined, Long, _ArgSpec, _Help}) ->
-    %% Only long form.
-    [$-, $- | Long];
-usage_option_text({_Name, Short, Long, _ArgSpec, _Help}) ->
-    %% Both short and long form.
-    [$-, Short, $,, $\s, $-, $- | Long].
-
-
--spec usage_help_text(option_spec()) -> string().
-usage_help_text({_Name, _Short, _Long, {_ArgType, ArgValue}, [_ | _] = Help}) ->
-    Help ++ " [default: " ++ default_arg_value_to_string(ArgValue) ++ "]";
-usage_help_text({_Name, _Short, _Long, _ArgSpec, Help}) ->
-    Help.
-
-
-%% @doc Calculate the maximum width of the column that shows the option's short
-%%      and long form.
--spec get_max_option_length(usage_line(), PrevMaxOptionLength :: non_neg_integer()) ->
-                                   {MaxOptionLength :: non_neg_integer(), usage_line_with_length()}.
-get_max_option_length({OptionText, HelpText}, PrevMaxOptionLength) ->
-    OptionLength = length(OptionText),
-    {erlang:max(OptionLength, PrevMaxOptionLength), {OptionLength, OptionText, HelpText}}.
-
-
-%% @doc Format the usage line that is shown for the options' usage. Each usage
-%%      line has 2 columns. The first column shows the options in their short
-%%      and long form. The second column shows the wrapped (if necessary) help
-%%      text lines associated with each option. e.g.:
-%%
-%%        -h, --host  Database server host name or IP address; this is the
-%%                    hostname of the server where the database is running
-%%                    [default: localhost]
-%%        -p, --port  Database server port [default: 1000]
-%%
--spec format_usage_line(MaxOptionLength :: non_neg_integer(), MaxLineLength :: non_neg_integer(),
-                        usage_line_with_length()) -> iolist().
-format_usage_line(MaxOptionLength, MaxLineLength, {OptionLength, OptionText, [_ | _] = HelpText})
-  when MaxOptionLength < (MaxLineLength div 2) ->
-    %% If the width of the column where the options are shown is smaller than
-    %% half the width of a console line then we show the help text line aligned
-    %% next to its corresponding option, with a separation of at least 2
-    %% characters.
-    [Head | Tail] = wrap_text_line(MaxLineLength - MaxOptionLength - 3, HelpText),
-    FirstLineIndentation = lists:duplicate(MaxOptionLength - OptionLength + 1, $\s),
-    Indentation = [$\n | lists:duplicate(MaxOptionLength + 3, $\s)],
-    ["  ", OptionText, FirstLineIndentation, Head,
-     [[Indentation, Line] || Line <- Tail], $\n];
-format_usage_line(_MaxOptionLength, MaxLineLength, {_OptionLength, OptionText, [_ | _] = HelpText}) ->
-    %% If the width of the first column is bigger than the width of a console
-    %% line, we show the help text on the next line with an indentation of 6
-    %% characters.
-    HelpLines = wrap_text_line(MaxLineLength - 6, HelpText),
-    ["  ", OptionText, [["\n      ", Line] || Line <- HelpLines], $\n];
-format_usage_line(_MaxOptionLength, _MaxLineLength, {_OptionLength, OptionText, _HelpText}) ->
-    ["  ", OptionText, $\n].
-
-
-%% @doc Wrap a text line converting it into several text lines so that the
-%%      length of each one of them is never over Length characters.
--spec wrap_text_line(Length :: non_neg_integer(), Text :: string()) -> [string()].
-wrap_text_line(Length, Text) ->
-    wrap_text_line(Length, Text, [], 0, []).
-
-wrap_text_line(Length, [Char | Tail], Acc, Count, CurrentLineAcc) when Count < Length ->
-    wrap_text_line(Length, Tail, Acc, Count + 1, [Char | CurrentLineAcc]);
-wrap_text_line(Length, [_ | _] = Help, Acc, Count, CurrentLineAcc) ->
-    %% Look for the first whitespace character in the current (reversed) line
-    %% buffer to get a wrapped line. If there is no whitespace just cut the
-    %% line at the position corresponding to the maximum length.
-    {NextLineAcc, WrappedLine} = case string:cspan(CurrentLineAcc, " \t") of
-                                     WhitespacePos when WhitespacePos < Count ->
-                                         lists:split(WhitespacePos, CurrentLineAcc);
-                                     _ ->
-                                         {[], CurrentLineAcc}
-                                 end,
-    wrap_text_line(Length, Help, [lists:reverse(WrappedLine) | Acc], length(NextLineAcc), NextLineAcc);
-wrap_text_line(_Length, [], Acc, _Count, [_ | _] = CurrentLineAcc) ->
-    %% If there was a non-empty line when we reached the buffer, add it to the accumulator
-    lists:reverse([lists:reverse(CurrentLineAcc) | Acc]);
-wrap_text_line(_Length, [], Acc, _Count, _CurrentLineAcc) ->
-    lists:reverse(Acc).
-
-
-default_arg_value_to_string(Value) when is_atom(Value) ->
-    atom_to_list(Value);
-default_arg_value_to_string(Value) when is_binary(Value) ->
-    binary_to_list(Value);
-default_arg_value_to_string(Value) when is_integer(Value) ->
-    integer_to_list(Value);
-default_arg_value_to_string(Value) when is_float(Value) ->
-    lists:flatten(io_lib:format("~w", [Value]));
-default_arg_value_to_string(Value) ->
-    Value.
-
-
-%% @doc Tokenize a command line string with support for single and double
-%%      quoted arguments (needed for arguments that have embedded whitespace).
-%%      The function also supports the expansion of environment variables in
-%%      both the Unix (${VAR}; $VAR) and Windows (%VAR%) formats. It does NOT
-%%      support wildcard expansion of paths.
--spec tokenize(CmdLine :: string()) -> [nonempty_string()].
-tokenize(CmdLine) ->
-    tokenize(CmdLine, [], []).
-
--spec tokenize(CmdLine :: string(), Acc :: [string()], ArgAcc :: string()) -> [string()].
-tokenize([Sep | Tail], Acc, ArgAcc) when ?IS_WHITESPACE(Sep) ->
-    NewAcc = case ArgAcc of
-                 [_ | _] ->
-                     %% Found separator: add to the list of arguments.
-                     [lists:reverse(ArgAcc) | Acc];
-                 [] ->
-                     %% Found separator with no accumulated argument; discard it.
-                     Acc
-             end,
-    tokenize(Tail, NewAcc, []);
-tokenize([QuotationMark | Tail], Acc, ArgAcc) when QuotationMark =:= $"; QuotationMark =:= $' ->
-    %% Quoted argument (might contain spaces, tabs, etc.)
-    tokenize_quoted_arg(QuotationMark, Tail, Acc, ArgAcc);
-tokenize([Char | _Tail] = CmdLine, Acc, ArgAcc) when Char =:= $$; Char =:= $% ->
-    %% Unix and Windows environment variable expansion: ${VAR}; $VAR; %VAR%
-    {NewCmdLine, Var} = expand_env_var(CmdLine),
-    tokenize(NewCmdLine, Acc, lists:reverse(Var, ArgAcc));
-tokenize([$\\, Char | Tail], Acc, ArgAcc) ->
-    %% Escaped char.
-    tokenize(Tail, Acc, [Char | ArgAcc]);
-tokenize([Char | Tail], Acc, ArgAcc) ->
-    tokenize(Tail, Acc, [Char | ArgAcc]);
-tokenize([], Acc, []) ->
-    lists:reverse(Acc);
-tokenize([], Acc, ArgAcc) ->
-    lists:reverse([lists:reverse(ArgAcc) | Acc]).
-
--spec tokenize_quoted_arg(QuotationMark :: char(), CmdLine :: string(), Acc :: [string()], ArgAcc :: string()) -> [string()].
-tokenize_quoted_arg(QuotationMark, [QuotationMark | Tail], Acc, ArgAcc) ->
-    %% End of quoted argument
-    tokenize(Tail, Acc, ArgAcc);
-tokenize_quoted_arg(QuotationMark, [$\\, Char | Tail], Acc, ArgAcc) ->
-    %% Escaped char.
-    tokenize_quoted_arg(QuotationMark, Tail, Acc, [Char | ArgAcc]);
-tokenize_quoted_arg($" = QuotationMark, [Char | _Tail] = CmdLine, Acc, ArgAcc) when Char =:= $$; Char =:= $% ->
-    %% Unix and Windows environment variable expansion (only for double-quoted arguments): ${VAR}; $VAR; %VAR%
-    {NewCmdLine, Var} = expand_env_var(CmdLine),
-    tokenize_quoted_arg(QuotationMark, NewCmdLine, Acc, lists:reverse(Var, ArgAcc));
-tokenize_quoted_arg(QuotationMark, [Char | Tail], Acc, ArgAcc) ->
-    tokenize_quoted_arg(QuotationMark, Tail, Acc, [Char | ArgAcc]);
-tokenize_quoted_arg(_QuotationMark, CmdLine, Acc, ArgAcc) ->
-    tokenize(CmdLine, Acc, ArgAcc).
-
-
--spec expand_env_var(CmdLine :: nonempty_string()) -> {string(), string()}.
-expand_env_var(CmdLine) ->
-    case CmdLine of
-        "${" ++ Tail ->
-            expand_env_var("${", $}, Tail, []);
-        "$" ++ Tail ->
-            expand_env_var("$", Tail, []);
-        "%" ++ Tail ->
-            expand_env_var("%", $%, Tail, [])
-    end.
-
--spec expand_env_var(Prefix :: string(), EndMark :: char(), CmdLine :: string(), Acc :: string()) -> {string(), string()}.
-expand_env_var(Prefix, EndMark, [Char | Tail], Acc)
-  when (Char >= $A andalso Char =< $Z) orelse (Char >= $a andalso Char =< $z) orelse
-       (Char >= $0 andalso Char =< $9) orelse (Char =:= $_) ->
-    expand_env_var(Prefix, EndMark, Tail, [Char | Acc]);
-expand_env_var(Prefix, EndMark, [EndMark | Tail], Acc) ->
-    {Tail, get_env_var(Prefix, [EndMark], Acc)};
-expand_env_var(Prefix, _EndMark, CmdLine, Acc) ->
-    {CmdLine, Prefix ++ lists:reverse(Acc)}.
-
-
--spec expand_env_var(Prefix :: string(), CmdLine :: string(), Acc :: string()) -> {string(), string()}.
-expand_env_var(Prefix, [Char | Tail], Acc)
-  when (Char >= $A andalso Char =< $Z) orelse (Char >= $a andalso Char =< $z) orelse
-       (Char >= $0 andalso Char =< $9) orelse (Char =:= $_) ->
-    expand_env_var(Prefix, Tail, [Char | Acc]);
-expand_env_var(Prefix, CmdLine, Acc) ->
-    {CmdLine, get_env_var(Prefix, "", Acc)}.
-
-
--spec get_env_var(Prefix :: string(), Suffix :: string(), Acc :: string()) -> string().
-get_env_var(Prefix, Suffix, [_ | _] = Acc) ->
-    Name = lists:reverse(Acc),
-    %% Only expand valid/existing variables.
-    case os:getenv(Name) of
-        false -> Prefix ++ Name ++ Suffix;
-        Value -> Value
-    end;
-get_env_var(Prefix, Suffix, []) ->
-    Prefix ++ Suffix.
-
-
--spec line_length() -> 0..?LINE_LENGTH.
-line_length() ->
-    case io:columns() of
-        {ok, Columns} when Columns < ?LINE_LENGTH ->
-            Columns - 1;
-        _ ->
-            ?LINE_LENGTH
-    end.
-
-
--spec to_string(term()) -> string().
-to_string(List) when is_list(List) ->
-    case io_lib:printable_list(List) of
-        true  -> List;
-        false -> io_lib:format("~p", [List])
-    end;
-to_string(Atom) when is_atom(Atom) ->
-    atom_to_list(Atom);
-to_string(Value) ->
-    io_lib:format("~p", [Value]).
-- 
2.1.0