initial working (hacked) version

.gitignore

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+_build
+tags
+.ycm_extra_conf.py
+*.swp

.gitmodules

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+[submodule "telegram-bot-api"]
+	path = telegram-bot-api
+	url = git@github.com:mandlm/telegram-bot-api
+	branch = cmake-submodule

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+
+add_subdirectory(telegram-bot-api)
+add_subdirectory(SimpleBot)

SimpleBot/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+
+find_package(Boost 1.60.0 COMPONENTS program_options REQUIRED)
+
+project(SimpleBot LANGUAGES CXX)
+
+add_executable(${PROJECT_NAME} 
+	SimpleBot.cpp
+)
+
+target_link_libraries(${PROJECT_NAME}
+	PRIVATE 
+		tgbot
+		Boost::program_options
+)
+
+target_compile_features(${PROJECT_NAME}
+	PRIVATE
+		cxx_std_17
+)
+

SimpleBot/SimpleBot.cpp

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+#include "tgbot/bot.h"
+
+#include <boost/program_options.hpp>
+
+#include <set>
+#include <string>
+#include <iostream>
+
+static const std::set<std::string> knownUsers = { "mandlm" };
+
+struct ProgramSettings
+{
+	std::string token;
+};
+
+ProgramSettings getProgramSettings(int argc, char **argv)
+{
+	namespace po = boost::program_options;
+	po::options_description optionsDescription("Allowed options");
+	optionsDescription.add_options()
+		("help", "show this help message")
+		("token,t", po::value<std::string>(), "Telegram bot token")
+	;
+
+	po::variables_map configuredOptions;
+	po::store(po::command_line_parser(argc, argv).options(optionsDescription).run(), 
+			configuredOptions);
+	po::notify(configuredOptions);
+
+	if (configuredOptions.find("help") != configuredOptions.cend()
+			|| configuredOptions.find("token") == configuredOptions.cend())
+	{
+		std::cout << optionsDescription << std::endl;
+		throw std::runtime_error("invalid options");
+	}
+
+	return ProgramSettings{ configuredOptions["token"].as<std::string>() };
+}
+
+std::string fullName(const tgbot::types::User &user)
+{
+	std::ostringstream fullName;
+	fullName << user.firstName;
+
+	if (user.lastName != nullptr)
+	{
+		fullName << " " << *user.lastName;
+	}
+
+	return fullName.str();
+}
+
+void replyUserUnknown(const tgbot::types::Message &message, const tgbot::methods::Api &api)
+{
+	api.sendMessage(std::to_string(message.chat.id), "Sorry, I don't know who you are.");
+}
+
+void handleMessage(const tgbot::types::Message message, const tgbot::methods::Api &api)
+{
+	if (message.from == nullptr || knownUsers.find(*message.from->username) == knownUsers.cend())
+	{
+		replyUserUnknown(message, api);
+
+		return;
+	}
+
+	std::cout << fullName(*message.from) 
+		<< " (" << *message.from->username << "): " 
+		<< (message.text != nullptr ? *message.text : "<no text>") << std::endl;
+
+	api.sendMessage(std::to_string(message.chat.id), "You said:");
+	if (message.text != nullptr)
+	{
+		api.sendMessage(std::to_string(message.chat.id), *message.text);
+	}
+	else
+	{
+		api.sendMessage(std::to_string(message.chat.id), "illegible things");
+	}
+}
+
+int main(int argc, char **argv)
+{
+	try
+	{
+		auto settings = getProgramSettings(argc, argv);
+
+		std::cout << "Running bot... " << std::endl;
+		
+		tgbot::LongPollBot bot(settings.token, { tgbot::types::UpdateType::MESSAGE });
+
+		std::cout << "connected as " << bot.getMe().firstName << std::endl;
+
+		bot.callback(handleMessage);
+		bot.start();
+	}
+	catch (std::runtime_error &e)
+	{
+		std::cout << "exiting." << std::endl;
+	
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}
+

telegram-bot-api

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+Subproject commit 286e252e99a882b2a77960132da19a12d2222341