cpp-cli/include/cli/prompt.h

//
//  prompt.h
//  cli
//
//  Created by Sam Jaffe on 10/10/20.
//  Copyright © 2020 Sam Jaffe. All rights reserved.
//

#pragma once

#include <iostream>
#include <memory>
#include <sstream>

#include "message.h"

namespace cli {

class prompt {
private:
  std::shared_ptr<struct message> input_prompt_;
  
public:
  template <typename ...Args>
  prompt(Args &&...args)
      : input_prompt_(make_message(std::forward<Args>(args)...)) {}
  
  template <typename T> T read(std::istream & in = std::cin) const {
    T rval{};
    while (true) {
      input_prompt_->print(std::cout);
      std::string data;
      if (!std::getline(in, data, '\n') || data.empty()) {
        break;
      }
      std::stringstream ss{data};
      if (ss >> rval) {
        break;
      }
    };
    return rval;
  }
};

}