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//
// lager - library for functional interactive c++ programs
// Copyright (C) 2017 Juan Pedro Bolivar Puente
//
// This file is part of lager.
//
// lager is free software: you can redistribute it and/or modify
// it under the terms of the MIT License, as detailed in the LICENSE
// file located at the root of this source code distribution,
// or here: <https://github.com/arximboldi/lager/blob/master/LICENSE>
//
#include "model.hpp"
#include <lager/util.hpp>
#include <lager/extra/cereal/immer_flex_vector.hpp>
#include <lager/extra/cereal/inline.hpp>
#include <lager/extra/cereal/struct.hpp>
#include <cereal/archives/json.hpp>
#include <cereal/cereal.hpp>
#include <fstream>
namespace todo {
model update(model s, model_action a)
{
return lager::match(std::move(a))(
[&](add_todo_action&& a) {
if (!a.text.empty())
s.todos = std::move(s.todos).push_front({false, a.text});
return std::move(s);
},
[&](std::pair<std::size_t, item_action>&& a) {
if (a.first >= s.todos.size()) {
std::cerr << "Invalid todo::item_action index!" << std::endl;
} else {
s.todos =
std::holds_alternative<remove_item_action>(a.second)
? std::move(s.todos).erase(a.first)
: std::move(s.todos).update(a.first, [&](auto&& t) {
return update(t, a.second);
});
}
return std::move(s);
});
}
void save(const std::string& fname, model todos)
{
auto s = std::ofstream{fname};
s.exceptions(std::fstream::badbit | std::fstream::failbit);
{
auto a = cereal::JSONOutputArchive{s};
save_inline(a, todos);
}
}
model load(const std::string& fname)
{
auto s = std::ifstream{fname};
s.exceptions(std::fstream::badbit);
auto r = model{};
{
auto a = cereal::JSONInputArchive{s};
load_inline(a, r);
}
return r;
}
} // namespace todo
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