outil

-module(outil@core).
-compile(no_auto_import).

-export([parse_bool/1]).
-export_type([command/1, argument/0, opt/0, opt_value/0, error/0]).

-type command(ESL) :: {command,
        binary(),
        binary(),
        list(argument()),
        list(opt()),
        fun((list(binary())) -> {ok, ESL} | {error, error()})}.

-type argument() :: {bool_argument, binary()} |
    {float_argument, binary()} |
    {int_argument, binary()} |
    {string_argument, binary()}.

-type opt() :: {opt,
        binary(),
        gleam@option:option(binary()),
        binary(),
        opt_value()}.

-type opt_value() :: bool_opt |
    {float_opt, float()} |
    {int_opt, integer()} |
    {string_opt, binary()}.

-type error() :: {malformed_argument, binary(), binary()} |
    {missing_argument, binary()} |
    {not_implemented, binary()} |
    {out_of_place_option, binary()}.

-spec parse_bool(binary()) -> {ok, boolean()} | {error, nil}.
parse_bool(Arg) ->
    case Arg of
        <<"true"/utf8>> ->
            {ok, true};

        <<"false"/utf8>> ->
            {ok, false};

        _ ->
            {error, nil}
    end.