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9c14fa58d8
* feat: allow optional arguments in `tr_getopt()` * test: new tests for optional arg * code review: `using Arg = tr_option::Arg` * refactor: static assert option array size * test: add new tests for missing arguments in the middle * test: static auto constexpr
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
// This file Copyright © Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#include <cstdint>
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/**
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* @addtogroup utils Utilities
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* @{
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*/
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/** @brief Similar to optind, this is the current index into argv */
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extern int tr_optind;
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struct tr_option
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{
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enum class Arg : uint8_t
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{
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None,
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Optional,
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Required
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};
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[[nodiscard]] constexpr bool has_arg() const noexcept
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{
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return arg >= Arg::Optional;
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}
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int val; /* the value to return from tr_getopt() */
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char const* longName; /* --long-form */
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char const* description; /* option's description for tr_getopt_usage() */
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char const* shortName; /* short form */
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Arg arg; /* See enum class Arg */
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char const* argName; /* argument's description for tr_getopt_usage() */
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};
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enum : int8_t
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{
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/* all options have been processed */
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TR_OPT_DONE = 0,
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/* a syntax error was detected, such as a missing
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* argument for an option that requires one */
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TR_OPT_ERR = -1,
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/* an unknown option was reached */
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TR_OPT_UNK = -2
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};
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/**
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* @brief similar to `getopt()`
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* @return `TR_GETOPT_DONE`, `TR_GETOPT_ERR`, `TR_GETOPT_UNK`, or the matching `tr_option`'s `val` field
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*/
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int tr_getopt(char const* usage, int argc, char const* const* argv, tr_option const* opts, char const** setme_optarg);
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/** @brief prints the `Usage` help section to stdout */
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void tr_getopt_usage(char const* app_name, char const* description, tr_option const* opts);
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/** @} */
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