spdlog_sink.hpp

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#ifndef GUIK_SPDLOG_SINK_HPP
#define GUIK_SPDLOG_SINK_HPP
 
#include <deque>
#include <imgui.h>
#include <spdlog/spdlog.h>
 
#if SPDLOG_VERSION >= 10600
#include <spdlog/pattern_formatter.h>
#else
#include <spdlog/details/pattern_formatter.h>
#endif
 
namespace guik {
 
template <typename RingBufferSink>
std::function<void()> create_logger_ui(const std::shared_ptr<RingBufferSink>& sink, double bg_alpha = 1.0) {
  auto enabled = std::make_shared<bool>(true);
  return [=] {
    if (!(*enabled)) {
      return;
    }
 
    const auto log_messages = sink->last_raw();
 
    ImGui::SetNextWindowSize(ImVec2(660, 400), ImGuiCond_FirstUseEver);
    ImGui::PushStyleColor(ImGuiCol_WindowBg, ImVec4(0.0f, 0.0f, 0.0f, bg_alpha));
    ImGui::Begin("logging", enabled.get());
    ImGui::PopStyleColor();
 
    if (ImGui::BeginChild("scrolling", ImVec2(0, 0), false, ImGuiWindowFlags_HorizontalScrollbar)) {
      std::array<ImVec4, 6> colors;
      colors[static_cast<int>(spdlog::level::trace)] = ImVec4(0.7f, 0.7f, 0.7f, 0.5f);
      colors[static_cast<int>(spdlog::level::debug)] = ImVec4(0.6f, 0.9f, 1.0f, 0.7f);
      colors[static_cast<int>(spdlog::level::info)] = ImVec4(0.9f, 1.0f, 0.9f, 1.0f);
      colors[static_cast<int>(spdlog::level::warn)] = ImVec4(1.0f, 1.0f, 0.0f, 1.0f);
      colors[static_cast<int>(spdlog::level::err)] = ImVec4(1.0f, 0.5f, 0.0f, 1.0f);
      colors[static_cast<int>(spdlog::level::critical)] = ImVec4(1.0f, 0.0f, 0.0f, 1.0f);
 
      spdlog::pattern_formatter formatter;
 
      for (const auto& log : log_messages) {
        const auto& level = log.level;
 
        spdlog::memory_buf_t formatted;
        formatter.format(log, formatted);
        std::string text = fmt::to_string(formatted);
 
        const auto& color = colors[static_cast<int>(level)];
        ImGui::TextColored(color, "%s", text.c_str());
      }
 
      if (ImGui::GetScrollY() >= ImGui::GetScrollMaxY()) {
        ImGui::SetScrollHereY(1.0f);
      }
    }
 
    ImGui::EndChild();
    ImGui::End();
  };
}
 
}  // namespace guik
 
#endif