implemented command-line and config-file options

BeezleBot/BeezleBot.cpp

@@ -1,7 +1,28 @@
+#include "settings.h"
+
 #include <iostream>
 
-int main(int, char **)
+int main(int argc, char **argv)
 {
-	std::cout << "BeezleBot running" << std::endl;
+	try
+	{
+		Settings settings(argc, argv);
+
+		std::cout << "token: " << settings.token << std::endl;
+		std::cout << "users: " << std::flush;
+		for (const auto &user : settings.users)
+		{
+			std::cout << user << " ";
+		}
+		std::cout << std::endl;
+	}
+	catch (std::runtime_error &e)
+	{
+		return EXIT_FAILURE;
+	}
+
+	std::cout << "BeezleBot running" << std::endl;
+
+	return EXIT_SUCCESS;
 }
 

BeezleBot/CMakeLists.txt

@@ -2,8 +2,16 @@ cmake_minimum_required(VERSION 3.5)
 
 project(BeezleBot LANGUAGES CXX)
 
+find_package(Boost 1.60.0 COMPONENTS program_options REQUIRED)
+
 add_executable(${PROJECT_NAME} 
 	BeezleBot.cpp
+	settings.cpp
+)
+
+target_link_libraries(${PROJECT_NAME}
+	PRIVATE 
+		Boost::program_options
 )
 
 target_compile_features(${PROJECT_NAME}

BeezleBot/settings.cpp

@@ -0,0 +1,62 @@
+#include "settings.h"
+
+#include <boost/program_options.hpp>
+
+#include <iostream>
+#include <fstream>
+#include <stdexcept>
+
+Settings::Settings(int argc, char **argv)
+{
+	namespace po = boost::program_options;
+
+	po::options_description commandlineOptions("Allowed options");
+	commandlineOptions.add_options()
+		("help,h", "show this help message")
+		("config-file,f", po::value<std::string>(), "read options from config file")
+		("token,t", po::value<std::string>(&token)->required(), "Telegram bot token")
+		("users,u", po::value<std::vector<std::string>>(&users)->multitoken()->required(), "allowed Telegram users")
+	;
+
+	po::variables_map configuredOptions;
+	po::store(po::command_line_parser(argc, argv).options(commandlineOptions).run(), 
+			configuredOptions);
+
+	if (configuredOptions.find("help") != configuredOptions.cend())
+	{
+		std::cout << commandlineOptions << std::endl;
+		throw std::runtime_error("invalid options");
+	}
+
+	if (configuredOptions.find("config-file") != configuredOptions.cend())
+	{
+		std::ifstream configFile(configuredOptions["config-file"].as<std::string>());
+
+		po::options_description fileOptions;
+		fileOptions.add_options()
+			("token", po::value<std::string>(&token))
+			("users", po::value<std::vector<std::string>>(&users)->multitoken())
+		;
+
+		try
+		{
+			po::store(po::parse_config_file(configFile, fileOptions), configuredOptions);
+		}
+		catch (po::unknown_option &e)
+		{
+			std::cout << "Error: " << e.what() << std::endl;
+			throw std::runtime_error("invalid options");
+		}
+	}
+
+	try
+	{
+		po::notify(configuredOptions);
+	}
+	catch (po::required_option &e)
+	{
+		std::cout << "Error: " << e.what() << std::endl;
+		std::cout << commandlineOptions << std::endl;
+		throw std::runtime_error("invalid options");
+	}
+}

BeezleBot/settings.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+struct Settings
+{
+	std::string token;
+	std::vector<std::string> users;
+
+	Settings(int argc, char **argv);	
+};
+