Mix FTXUI logger and spdlog lib

[Chasikanaft]

Anyone did something like this? I saw an example FTXUI with Windowslogger, but I would like to format the messages as needed right away. Is it possible to override the "logger class" spdlog for output in FTXUI?

[Root3287]

Currently researching into this. What I think you could do is to add an std::ostream sink to your spdlog object. Then from there, parse out the output where it has \n and create a ftxui::text() per line. Then add all of those to a ftxui::vbox(). The issue is splitting at \n. So what you can do is make your own std::ostream sink. So far that is my theory, but I will come back and update this thread when I have working code.

[Root3287]

Well I got it done faster than I though...

ftxui_sink.hpp

#pragma once

#include <mutex>
#include <ostream>

#include <ftxui/dom/elements.hpp>

#include <spdlog/sinks/base_sink.h>

template<typename Mutex>
class ftxui_sink : public spdlog::sinks::base_sink<Mutex>{
public:
	inline std::vector<ftxui::Element> getLog() { return _log; };
protected:
	void sink_it_(const spdlog::details::log_msg& msg) override{
		spdlog::memory_buf_t formatted;
		spdlog::sinks::base_sink<Mutex>::formatter_->format(msg, formatted);

		std::stringstream ss;
		ss.write(formatted.data(), static_cast<std::streamsize>(formatted.size()));
		auto text = ftxui::text(ss.str());
		_log.push_back(text);
	};
	void flush_() override {};

	std::vector<ftxui::Element> _log;
};

using ftxui_sink_mt = ftxui_sink<std::mutex>;
using ftxui_sink_st = ftxui_sink<spdlog::details::null_mutex>;

main.cpp

_LOGGER = std::make_shared<ftxui_sink_mt>();
// Setup your logger how you want
// ...
// FTXUI code

auto log = ftxui::vbox(_LOGGER->getLog());
ftxui::Render(screen, log);