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tdlib-fork/tdutils/td/utils/OptionsParser.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/common.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
#include <functional>
#include <string>
#if !TD_WINDOWS
#include <getopt.h>
#endif
namespace td {
class OptionsParser {
class Option {
public:
enum Type { NoArg, Arg, OptionalArg };
Type type;
char short_key;
std::string long_key;
std::string description;
std::function<Status(Slice)> arg_callback;
};
public:
void set_description(std::string description) {
description_ = std::move(description);
}
void add_option(Option::Type type, char short_key, Slice long_key, Slice description,
std::function<Status(Slice)> callback) {
options_.push_back(Option{type, short_key, long_key.str(), description.str(), std::move(callback)});
}
void add_option(char short_key, Slice long_key, Slice description, std::function<Status(Slice)> callback) {
add_option(Option::Type::Arg, short_key, long_key, description, std::move(callback));
}
void add_option(char short_key, Slice long_key, Slice description, std::function<Status(void)> callback) {
// Ouch. There must be some better way
add_option(Option::Type::NoArg, short_key, long_key, description,
std::bind([](std::function<Status(void)> &func, Slice) { return func(); }, std::move(callback),
std::placeholders::_1));
}
Result<int> run(int argc, char *argv[]) TD_WARN_UNUSED_RESULT {
#if TD_WINDOWS
return -1;
#else
char buff[1024];
StringBuilder sb(MutableSlice{buff, sizeof(buff)});
for (auto &opt : options_) {
CHECK(opt.type != Option::OptionalArg);
sb << opt.short_key;
if (opt.type == Option::Arg) {
sb << ":";
}
}
if (sb.is_error()) {
return Status::Error("Can't parse options");
}
CSlice short_options = sb.as_cslice();
vector<option> long_options;
for (auto &opt : options_) {
if (opt.long_key.empty()) {
continue;
}
option o;
o.flag = nullptr;
o.val = opt.short_key;
o.has_arg = opt.type == Option::Arg ? required_argument : no_argument;
o.name = opt.long_key.c_str();
long_options.push_back(o);
}
long_options.push_back({nullptr, 0, nullptr, 0});
while (true) {
int opt_i = getopt_long(argc, argv, short_options.c_str(), &long_options[0], nullptr);
if (opt_i == ':') {
return Status::Error("Missing argument");
}
if (opt_i == '?') {
return Status::Error("Unrecognized option");
}
if (opt_i == -1) {
break;
}
bool found = false;
for (auto &opt : options_) {
if (opt.short_key == opt_i) {
Slice arg;
if (opt.type == Option::Arg) {
arg = Slice(optarg);
}
auto status = opt.arg_callback(arg);
if (status.is_error()) {
return std::move(status);
}
found = true;
break;
}
}
if (!found) {
return Status::Error("Unknown argument");
}
}
return optind;
#endif
}
friend StringBuilder &operator<<(StringBuilder &sb, const OptionsParser &o) {
sb << o.description_ << "\n";
for (auto &opt : o.options_) {
sb << "-" << opt.short_key;
if (!opt.long_key.empty()) {
sb << "|--" << opt.long_key;
}
if (opt.type == Option::OptionalArg) {
sb << "[";
}
if (opt.type != Option::NoArg) {
sb << "<arg>";
}
if (opt.type == Option::OptionalArg) {
sb << "]";
}
sb << "\t" << opt.description;
sb << "\n";
}
return sb;
}
private:
std::vector<Option> options_;
std::string description_;
};
} // namespace td