commandLineParser.hpp

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// Copyright (c) 2020-2025 Cody R. Drisko. All rights reserved.
// Licensed under the MIT License. See the LICENSE file in the project root for more information.
//
// Name: commandLineParser.hpp
// Author: crdrisko
// Date: 11/19/2020-14:13:01
// Description:
 
#ifndef COMMANDLINEPARSER_HPP
#define COMMANDLINEPARSER_HPP
 
#include <filesystem>
#include <tuple>
#include <utility>
 
#include <common-utils/meta.hpp>
 
#include "cmdLineOptions.hpp"
 
namespace GetOpts
{
    namespace fs = std::filesystem;
 
    template<typename... TArgs>
    class CommandLineParser
    {
    private:
        fs::path programName;
 
        std::tuple<TArgs...> options;
 
        std::string generateUsage() const
        {
            std::string usageMessage;
 
            usageMessage += "\nUSAGE: " + programName.stem().string() + " [-hv";
 
            DryChem::apply_n<3>([&](auto... elem) { ((usageMessage += elem.generateUsage()), ...); }, options);
 
            usageMessage += "] ";
 
            DryChem::apply_n<1>(
                [&](auto... elem) { ((usageMessage += elem.generateUsage() + " "), ...); }, DryChem::reverse(options));
 
            return usageMessage;
        }
 
    public:
        CommandLineParser(const TArgs&... Options) : options {Options...} {}
 
        void setCommandLineOptions(int, const char** argv) { programName = std::string {argv[0]}; }
 
        void printHelpMessage(const std::string& exampleUsage) const
        {
            std::cout << generateUsage() << "\n\n";
            std::cout << "  -h  Prints help information about the " << programName.stem() << " program.\n";
            std::cout << "  -v  Verbose mode. Defaults to false/off.\n";
 
            DryChem::apply_n<3>([&](auto... elem) { ((std::cout << elem.getHelpMessage() << std::endl), ...); }, options);
 
            std::cout << '\n';
 
            DryChem::apply_n<1>(
                [&](auto... elem) { ((std::cout << elem.getHelpMessage() << std::endl), ...); }, DryChem::reverse(options));
 
            std::cout << "\nEXAMPLE: " << exampleUsage << "\n\n";
        }
    };
}   // namespace GetOpts
 
#endif