path_location.hpp

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// Copyright Take Vos 2022.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "../generator.hpp"
#include "../utility/module.hpp"
#include <filesystem>
#include <ranges>
 
namespace hi { inline namespace v1 {
 
enum class path_location {
    resource_dirs,
 
    executable_file,
 
    executable_dir,
 
    library_file,
 
    library_dir,
 
    data_dir,
 
    log_dir,
 
    preferences_file,
 
    system_font_dirs,
 
    font_dirs,
 
    theme_dirs,
};
 
[[nodiscard]] generator<std::filesystem::path> get_paths(path_location location);
 
[[nodiscard]] inline std::optional<std::filesystem::path> find_path(path_location location, std::filesystem::path const &ref) noexcept
{
    if (ref.is_absolute()) {
        if (std::filesystem::exists(ref)) {
            return ref;
        } else {
            return {};
        }
    } else {
        for (hilet &base: get_paths(location)) {
            auto path = base / ref;
            if (std::filesystem::exists(path)) {
                return path;
            }
        }
        return {};
    }
}
 
[[nodiscard]] inline std::filesystem::path get_path(path_location location)
{
    auto range = get_paths(location);
    auto it = std::ranges::begin(range);
    hilet last = std::ranges::end(range);
 
    if (it == last) {
        throw url_error("No path found.");
    }
 
    auto path = *it++;
 
    if (it != last) {
        throw url_error("More than one path found.");
    }
 
    return path;
}
 
 
}} // namespace hi::v1