command_line.h

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// Copyright (c) 2014-2018, The Monero Project
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#pragma once

#include <functional>
#include <iostream>
#include <sstream>
#include <array>
#include <type_traits>

#include <boost/program_options/parsers.hpp>
#include <boost/program_options/options_description.hpp>
#include <boost/program_options/variables_map.hpp>
#include "include_base_utils.h"

namespace command_line
{

  bool is_yes(const std::string& str);
  bool is_no(const std::string& str);

  template<typename T, bool required = false, bool dependent = false, int NUM_DEPS = 1>
  struct arg_descriptor;

  template<typename T>
  struct arg_descriptor<T, false>
  {
    typedef T value_type;

    const char* name;
    const char* description;
    T default_value;
    bool not_use_default;
  };

  template<typename T>
  struct arg_descriptor<std::vector<T>, false>
  {
    typedef std::vector<T> value_type;

    const char* name;
    const char* description;
  };

  template<typename T>
  struct arg_descriptor<T, true>
  {
    static_assert(!std::is_same<T, bool>::value, "Boolean switch can't be required");

    typedef T value_type;

    const char* name;
    const char* description;
  };

  template<typename T>
  struct arg_descriptor<T, false, true>
  {
    typedef T value_type;

    const char* name;
    const char* description;

    T default_value;

    const arg_descriptor<bool, false>& ref;
    std::function<T(bool, bool, T)> depf;

    bool not_use_default;
  };

  template<typename T, int NUM_DEPS>
  struct arg_descriptor<T, false, true, NUM_DEPS>
  {
    typedef T value_type;

    const char* name;
    const char* description;

    T default_value;

    std::array<const arg_descriptor<bool, false> *, NUM_DEPS> ref;
    std::function<T(std::array<bool, NUM_DEPS>, bool, T)> depf;

    bool not_use_default;
  };

  template<typename T>
  boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, true>& /*arg*/)
  {
    return boost::program_options::value<T>()->required();
  }

  template<typename T>
  boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, false>& arg)
  {
    auto semantic = boost::program_options::value<T>();
    if (!arg.not_use_default)
      semantic->default_value(arg.default_value);
    return semantic;
  }

  template<typename T>
  boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, false, true>& arg)
  {
    auto semantic = boost::program_options::value<T>();
    if (!arg.not_use_default) {
      std::ostringstream format;
      format << arg.depf(false, true, arg.default_value) << ", "
             << arg.depf(true, true, arg.default_value) << " if '"
             << arg.ref.name << "'";
      semantic->default_value(arg.depf(arg.ref.default_value, true, arg.default_value), format.str());
    }
    return semantic;
  }

  template<typename T, int NUM_DEPS>
  boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, false, true, NUM_DEPS>& arg)
  {
    auto semantic = boost::program_options::value<T>();
    if (!arg.not_use_default) {
      std::array<bool, NUM_DEPS> depval;
      depval.fill(false);
      std::ostringstream format;
      format << arg.depf(depval, true, arg.default_value);
      for (size_t i = 0; i < depval.size(); ++i)
      {
        depval.fill(false);
        depval[i] = true;
        format << ", " << arg.depf(depval, true, arg.default_value) << " if '" << arg.ref[i]->name << "'";
      }
      for (size_t i = 0; i < depval.size(); ++i)
        depval[i] = arg.ref[i]->default_value;
      semantic->default_value(arg.depf(depval, true, arg.default_value), format.str());
    }
    return semantic;
  }

  template<typename T>
  boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, false>& arg, const T& def)
  {
    auto semantic = boost::program_options::value<T>();
    if (!arg.not_use_default)
      semantic->default_value(def);
    return semantic;
  }

  template<typename T>
  boost::program_options::typed_value<std::vector<T>, char>* make_semantic(const arg_descriptor<std::vector<T>, false>& /*arg*/)
  {
    auto semantic = boost::program_options::value< std::vector<T> >();
    semantic->default_value(std::vector<T>(), "");
    return semantic;
  }

  template<typename T, bool required, bool dependent, int NUM_DEPS>
  void add_arg(boost::program_options::options_description& description, const arg_descriptor<T, required, dependent, NUM_DEPS>& arg, bool unique = true)
  {
    if (0 != description.find_nothrow(arg.name, false))
    {
      CHECK_AND_ASSERT_MES(!unique, void(), "Argument already exists: " << arg.name);
      return;
    }

    description.add_options()(arg.name, make_semantic(arg), arg.description);
  }

  template<typename T>
  void add_arg(boost::program_options::options_description& description, const arg_descriptor<T, false>& arg, const T& def, bool unique = true)
  {
    if (0 != description.find_nothrow(arg.name, false))
    {
      CHECK_AND_ASSERT_MES(!unique, void(), "Argument already exists: " << arg.name);
      return;
    }

    description.add_options()(arg.name, make_semantic(arg, def), arg.description);
  }

  template<>
  inline void add_arg(boost::program_options::options_description& description, const arg_descriptor<bool, false>& arg, bool unique)
  {
    if (0 != description.find_nothrow(arg.name, false))
    {
      CHECK_AND_ASSERT_MES(!unique, void(), "Argument already exists: " << arg.name);
      return;
    }

    description.add_options()(arg.name, boost::program_options::bool_switch(), arg.description);
  }

  template<typename charT>
  boost::program_options::basic_parsed_options<charT> parse_command_line(int argc, const charT* const argv[],
    const boost::program_options::options_description& desc, bool allow_unregistered = false)
  {
    auto parser = boost::program_options::command_line_parser(argc, argv);
    parser.options(desc);
    if (allow_unregistered)
    {
      parser.allow_unregistered();
    }
    return parser.run();
  }

  template<typename F>
  bool handle_error_helper(const boost::program_options::options_description& desc, F parser)
  {
    try
    {
      return parser();
    }
    catch (const std::exception& e)
    {
      std::cerr << "Failed to parse arguments: " << e.what() << std::endl;
      std::cerr << desc << std::endl;
      return false;
    }
    catch (...)
    {
      std::cerr << "Failed to parse arguments: unknown exception" << std::endl;
      std::cerr << desc << std::endl;
      return false;
    }
  }

  template<typename T, bool required, bool dependent, int NUM_DEPS>
  typename std::enable_if<!std::is_same<T, bool>::value, bool>::type has_arg(const boost::program_options::variables_map& vm, const arg_descriptor<T, required, dependent, NUM_DEPS>& arg)
  {
    auto value = vm[arg.name];
    return !value.empty();
  }

  template<typename T, bool required, bool dependent, int NUM_DEPS>
  bool is_arg_defaulted(const boost::program_options::variables_map& vm, const arg_descriptor<T, required, dependent, NUM_DEPS>& arg)
  {
    return vm[arg.name].defaulted();
  }

  template<typename T>
  T get_arg(const boost::program_options::variables_map& vm, const arg_descriptor<T, false, true>& arg)
  {
    return arg.depf(get_arg(vm, arg.ref), is_arg_defaulted(vm, arg), vm[arg.name].template as<T>());
  }

  template<typename T, int NUM_DEPS>
  T get_arg(const boost::program_options::variables_map& vm, const arg_descriptor<T, false, true, NUM_DEPS>& arg)
  {
    std::array<bool, NUM_DEPS> depval;
    for (size_t i = 0; i < depval.size(); ++i)
      depval[i] = get_arg(vm, *arg.ref[i]);
    return arg.depf(depval, is_arg_defaulted(vm, arg), vm[arg.name].template as<T>());
  }

  template<typename T, bool required>
  T get_arg(const boost::program_options::variables_map& vm, const arg_descriptor<T, required>& arg)
  {
    return vm[arg.name].template as<T>();
  }
 
  template<bool dependent, int NUM_DEPS>
  inline bool has_arg(const boost::program_options::variables_map& vm, const arg_descriptor<bool, false, dependent, NUM_DEPS>& arg)
  {
    return get_arg(vm, arg);
  }


  extern const arg_descriptor<bool> arg_help;
  extern const arg_descriptor<bool> arg_version;
}