#pragma once

#include "cmd/cmd_base.hpp"
#include <fstream>
#include <ios>
#include <stdexcept>
#include <string>

namespace fsh {

    class CmdTruncate : public Command {

      protected:
        virtual void register_flags() override {
            ArgFactory& factory = get_factory();
            factory.add_rule<std::string>(1);
        }

        virtual void run(std::istream& in, std::ostream& out, ArgManager& args) override {

            std::string filename = args.get<std::string>(0).value();

            if(!std::ifstream(filename, std::ios_base::in)) {
                throw util::FileExistsError();
            }

            if(!std::ofstream(filename, std::ios_base::out)) {
                throw util::CmdError("Failed to truncate");
            }

        }
    };

}