formatter.hpp

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// ReSharper disable CppMemberFunctionMayBeStatic
// ReSharper disable CppClangTidyCertDcl58Cpp
#pragma once

#include <filesystem>
#include <format>
#include <sstream>

#include "Mountain/utils/concepts.hpp"


// These definitions must be in the std namespace

template <>
struct std::formatter<std::filesystem::path>
{
    template <class ParseContext>
    constexpr typename ParseContext::iterator parse(ParseContext& ctx)
    {
        auto it = ctx.begin();
        if (it == ctx.end())
            return it;
 
        if (*it != '}')
            throw std::format_error("Invalid format args for std::filesystem::path");
 
        return it;
    }

    template <class FormatContext>
    typename FormatContext::iterator format(const std::filesystem::path& path, FormatContext& ctx) const
    {
        std::ostringstream out;

        out << path.generic_string();
        
        return std::ranges::copy(std::move(out).str(), ctx.out()).out;
    }
};

template <Mountain::Concepts::ExceptionT Exception>
struct std::formatter<Exception>
{
    template <class ParseContext>
    constexpr typename ParseContext::iterator parse(ParseContext& ctx)
    {
        auto it = ctx.begin();
        if (it == ctx.end())
            return it;
 
        if (*it != '}')
            throw std::format_error("Invalid format args for std::exception");
 
        return it;
    }

    template <class FormatContext>
    typename FormatContext::iterator format(const Exception& ex, FormatContext& ctx) const
    {
        std::ostringstream out;

        out << ex.what();
        
        return std::ranges::copy(std::move(out).str(), ctx.out()).out;
    }
};