indicators/include/indicators/setting.hpp

/*
Activity Indicators for Modern C++
https://github.com/p-ranav/indicators

Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2019 Dawid Pilarski <dawid.pilarski@panicsoftware.com>.

Permission is hereby  granted, free of charge, to any  person obtaining a copy
of this software and associated  documentation files (the "Software"), to deal
in the Software  without restriction, including without  limitation the rights
to  use, copy,  modify, merge,  publish, distribute,  sublicense, and/or  sell
copies  of  the Software,  and  to  permit persons  to  whom  the Software  is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF  MERCHANTABILITY,
FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN NO EVENT  SHALL THE
AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY  CLAIM,  DAMAGES OR  OTHER
LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#pragma once

#include <cstddef>
#include <indicators/color.hpp>
#include <indicators/font_style.hpp>
#include <string>
#include <type_traits>
#include <utility>
#include <vector>

namespace indicators {

namespace details {

template <bool condition> struct if_else;

template <> struct if_else<true> { using type = std::true_type; };

template <> struct if_else<false> { using type = std::false_type; };

template <bool condition, typename True, typename False> struct if_else_type;

template <typename True, typename False> struct if_else_type<true, True, False> {
  using type = True;
};

template <typename True, typename False> struct if_else_type<false, True, False> {
  using type = False;
};

template <typename... Ops> struct conjuction;

template <> struct conjuction<> : std::true_type {};

template <typename Op, typename... TailOps>
struct conjuction<Op, TailOps...>
    : if_else_type<!Op::value, std::false_type, conjuction<TailOps...>>::type {};

template <typename... Ops> struct disjunction;

template <> struct disjunction<> : std::false_type {};

template <typename Op, typename... TailOps>
struct disjunction<Op, TailOps...>
    : if_else_type<Op::value, std::true_type, disjunction<TailOps...>>::type {};

enum class ProgressBarOption {
  bar_width = 0,
  prefix_text,
  postfix_text,
  start,
  end,
  fill,
  lead,
  remainder,
  max_postfix_text_len,
  completed,
  show_percentage,
  show_elapsed_time,
  show_remaining_time,
  saved_start_time,
  foreground_color,
  spinner_show,
  spinner_states,
  font_styles,
  hide_bar_when_complete,
  max_progress
};

template <typename T, ProgressBarOption Id> struct Setting {
  template <typename... Args,
            typename = typename std::enable_if<std::is_constructible<T, Args...>::value>::type>
  explicit Setting(Args &&... args) : value(std::forward<Args>(args)...) {}
  Setting(const Setting &) = default;
  Setting(Setting &&) = default;

  static constexpr auto id = Id;
  using type = T;

  T value{};
};

template <typename T> struct is_setting : std::false_type {};

template <ProgressBarOption Id, typename T> struct is_setting<Setting<T, Id>> : std::true_type {};

template <typename... Args>
struct are_settings : if_else<conjuction<is_setting<Args>...>::value>::type {};

template <> struct are_settings<> : std::true_type {};

template <typename Setting, typename Tuple> struct is_setting_from_tuple;

template <typename Setting> struct is_setting_from_tuple<Setting, std::tuple<>> : std::true_type {};

template <typename Setting, typename... TupleTypes>
struct is_setting_from_tuple<Setting, std::tuple<TupleTypes...>>
    : if_else<disjunction<std::is_same<Setting, TupleTypes>...>::value>::type {};

template <typename Tuple, typename... Settings>
struct are_settings_from_tuple
    : if_else<conjuction<is_setting_from_tuple<Settings, Tuple>...>::value>::type {};

template <ProgressBarOption Id> struct always_true { static constexpr auto value = true; };

template <ProgressBarOption Id, typename Default> Default &&get_impl(Default &&def) {
  return std::forward<Default>(def);
}

template <ProgressBarOption Id, typename Default, typename T, typename... Args>
auto get_impl(Default &&/*def*/, T &&first, Args &&... /*tail*/) ->
    typename std::enable_if<(std::decay<T>::type::id == Id),
                            decltype(std::forward<T>(first))>::type {
  return std::forward<T>(first);
}

template <ProgressBarOption Id, typename Default, typename T, typename... Args>
auto get_impl(Default &&def, T &&/*first*/, Args &&... tail) ->
    typename std::enable_if<(std::decay<T>::type::id != Id),
                            decltype(get_impl<Id>(std::forward<Default>(def),
                                                  std::forward<Args>(tail)...))>::type {
  return get_impl<Id>(std::forward<Default>(def), std::forward<Args>(tail)...);
}

template <ProgressBarOption Id, typename Default, typename... Args,
          typename = typename std::enable_if<are_settings<Args...>::value, void>::type>
auto get(Default &&def, Args &&... args)
    -> decltype(details::get_impl<Id>(std::forward<Default>(def), std::forward<Args>(args)...)) {
  return details::get_impl<Id>(std::forward<Default>(def), std::forward<Args>(args)...);
}

template <ProgressBarOption Id> using StringSetting = Setting<std::string, Id>;

template <ProgressBarOption Id> using IntegerSetting = Setting<std::size_t, Id>;

template <ProgressBarOption Id> using BooleanSetting = Setting<bool, Id>;

template <ProgressBarOption Id, typename Tuple, std::size_t counter = 0> struct option_idx;

template <ProgressBarOption Id, typename T, typename... Settings, std::size_t counter>
struct option_idx<Id, std::tuple<T, Settings...>, counter>
    : if_else_type<(Id == T::id), std::integral_constant<std::size_t, counter>,
                   option_idx<Id, std::tuple<Settings...>, counter + 1>>::type {};

template <ProgressBarOption Id, std::size_t counter> struct option_idx<Id, std::tuple<>, counter> {
  static_assert(always_true<(ProgressBarOption)Id>::value, "No such option was found");
};

template <ProgressBarOption Id, typename Settings>
auto get_value(Settings &&settings)
    -> decltype((std::get<option_idx<Id, typename std::decay<Settings>::type>::value>(
        std::declval<Settings &&>()))) {
  return std::get<option_idx<Id, typename std::decay<Settings>::type>::value>(
      std::forward<Settings>(settings));
}

} // namespace details

namespace option {
using BarWidth = details::IntegerSetting<details::ProgressBarOption::bar_width>;
using PrefixText = details::StringSetting<details::ProgressBarOption::prefix_text>;
using PostfixText = details::StringSetting<details::ProgressBarOption::postfix_text>;
using Start = details::StringSetting<details::ProgressBarOption::start>;
using End = details::StringSetting<details::ProgressBarOption::end>;
using Fill = details::StringSetting<details::ProgressBarOption::fill>;
using Lead = details::StringSetting<details::ProgressBarOption::lead>;
using Remainder = details::StringSetting<details::ProgressBarOption::remainder>;
using MaxPostfixTextLen = details::IntegerSetting<details::ProgressBarOption::max_postfix_text_len>;
using Completed = details::BooleanSetting<details::ProgressBarOption::completed>;
using ShowPercentage = details::BooleanSetting<details::ProgressBarOption::show_percentage>;
using ShowElapsedTime = details::BooleanSetting<details::ProgressBarOption::show_elapsed_time>;
using ShowRemainingTime = details::BooleanSetting<details::ProgressBarOption::show_remaining_time>;
using SavedStartTime = details::BooleanSetting<details::ProgressBarOption::saved_start_time>;
using ForegroundColor = details::Setting<Color, details::ProgressBarOption::foreground_color>;
using ShowSpinner = details::BooleanSetting<details::ProgressBarOption::spinner_show>;
using SpinnerStates =
    details::Setting<std::vector<std::string>, details::ProgressBarOption::spinner_states>;
using HideBarWhenComplete =
    details::BooleanSetting<details::ProgressBarOption::hide_bar_when_complete>;
using FontStyles =
    details::Setting<std::vector<FontStyle>, details::ProgressBarOption::font_styles>;
using MaxProgress = details::IntegerSetting<details::ProgressBarOption::max_progress>;
} // namespace option
} // namespace indicators