cppargs/include/cppargs/options/option.h

#pragma once

#include <string>
#include <cppargs/misc/context.h>

namespace cppargs
{

    /**
     * @brief Class to store all meta data for a option.
     */
    struct option_meta
    {
        char        short_name      { '\0'  };  //!< short option of the option (without the prependding -)
        std::string long_name       { ""    };  //!< long name of the option (without the prepending --)
        std::string description     { ""    };  //!< description for this option
        std::string arguments       { ""    };  //!< arguments to pass to this option
        std::string default_value   { ""    };  //!< default value for this option
        bool        mandatory       { false };  //!< TRUE if this option is optional, FALSE otherwise

        inline option_meta& set_short_name     (char value);
        inline option_meta& set_long_name      (const std::string& value);
        inline option_meta& set_description    (const std::string& value);
        inline option_meta& set_arguments      (const std::string& value);
        inline option_meta& set_default_value  (const std::string& value);
        inline option_meta& set_mandatory      (bool value = true);

        template<typename T_value>
        static option_meta prepare_arguments(const option_meta& meta);
    };

    /**
     * @brief Option to parse from command line arguments
     */
    struct option
    {
    public:
        const option_meta meta; //!< meta data of the option

    protected:
        /**
         * @brief Constructor.
         *
         * @param[in] p_long_name   Long name of the option.
         * @param[in] p_short_name  Short name of the option.
         */
        inline option(const option_meta& meta);

    public:
        /**
         * @brief Destructor.
         */
        virtual ~option() = default;

        /**
         * @brief Parse the option using the current context.
         *
         * @param[in|out] c     Context to use for parsing.
         */
        virtual void parse(context& c) const = 0;
    };

}