150 lines
4.0 KiB
C++
150 lines
4.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#include "td/utils/logging.h"
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#include "td/utils/Slice.h"
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#include "td/utils/Status.h"
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#include "td/utils/StringBuilder.h"
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#include <functional>
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#include <string>
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#if !TD_WINDOWS
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#include <getopt.h>
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#endif
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namespace td {
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class OptionsParser {
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class Option {
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public:
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enum Type { NoArg, Arg, OptionalArg };
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Type type;
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char short_key;
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std::string long_key;
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std::string description;
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std::function<Status(Slice)> arg_callback;
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};
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public:
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void set_description(std::string description) {
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description_ = std::move(description);
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}
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void add_option(Option::Type type, char short_key, Slice long_key, Slice description,
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std::function<Status(Slice)> callback) {
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options_.push_back(Option{type, short_key, long_key.str(), description.str(), std::move(callback)});
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}
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void add_option(char short_key, Slice long_key, Slice description, std::function<Status(Slice)> callback) {
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add_option(Option::Type::Arg, short_key, long_key, description, std::move(callback));
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}
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void add_option(char short_key, Slice long_key, Slice description, std::function<Status(void)> callback) {
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// Ouch. There must be some better way
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add_option(Option::Type::NoArg, short_key, long_key, description,
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std::bind([](std::function<Status(void)> &func, Slice) { return func(); }, std::move(callback),
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std::placeholders::_1));
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}
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Result<int> run(int argc, char *argv[]) TD_WARN_UNUSED_RESULT {
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#if TD_WINDOWS
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return -1;
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#else
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char buff[1024];
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StringBuilder sb(MutableSlice{buff, sizeof(buff)});
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for (auto &opt : options_) {
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CHECK(opt.type != Option::OptionalArg);
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sb << opt.short_key;
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if (opt.type == Option::Arg) {
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sb << ":";
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}
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}
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if (sb.is_error()) {
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return Status::Error("Can't parse options");
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}
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CSlice short_options = sb.as_cslice();
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vector<option> long_options;
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for (auto &opt : options_) {
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if (opt.long_key.empty()) {
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continue;
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}
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option o;
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o.flag = nullptr;
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o.val = opt.short_key;
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o.has_arg = opt.type == Option::Arg ? required_argument : no_argument;
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o.name = opt.long_key.c_str();
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long_options.push_back(o);
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}
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long_options.push_back({nullptr, 0, nullptr, 0});
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while (true) {
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int opt_i = getopt_long(argc, argv, short_options.c_str(), &long_options[0], nullptr);
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if (opt_i == ':') {
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return Status::Error("Missing argument");
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}
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if (opt_i == '?') {
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return Status::Error("Unrecognized option");
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}
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if (opt_i == -1) {
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break;
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}
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bool found = false;
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for (auto &opt : options_) {
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if (opt.short_key == opt_i) {
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Slice arg;
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if (opt.type == Option::Arg) {
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arg = Slice(optarg);
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}
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auto status = opt.arg_callback(arg);
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if (status.is_error()) {
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return std::move(status);
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}
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found = true;
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break;
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}
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}
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if (!found) {
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return Status::Error("Unknown argument");
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}
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}
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return optind;
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#endif
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}
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friend StringBuilder &operator<<(StringBuilder &sb, const OptionsParser &o) {
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sb << o.description_ << "\n";
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for (auto &opt : o.options_) {
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sb << "-" << opt.short_key;
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if (!opt.long_key.empty()) {
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sb << "|--" << opt.long_key;
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}
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if (opt.type == Option::OptionalArg) {
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sb << "[";
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}
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if (opt.type != Option::NoArg) {
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sb << "<arg>";
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}
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if (opt.type == Option::OptionalArg) {
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sb << "]";
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}
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sb << "\t" << opt.description;
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sb << "\n";
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}
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return sb;
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}
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private:
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std::vector<Option> options_;
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std::string description_;
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};
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} // namespace td
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