Waybar/src/modules/hyprland/language.cpp

#include "modules/hyprland/language.hpp"

#include <spdlog/spdlog.h>
#include <xkbcommon/xkbcommon.h>
#include <xkbcommon/xkbregistry.h>

#include <util/sanitize_str.hpp>

#include "modules/hyprland/backend.hpp"

namespace waybar::modules::hyprland {

Language::Language(const std::string& id, const Bar& bar, const Json::Value& config)
    : ALabel(config, "language", id, "{}", 0, true), bar_(bar) {
  modulesReady = true;

  if (!gIPC.get()) {
    gIPC = std::make_unique<IPC>();
  }

  // get the active layout when open
  initLanguage();

  label_.hide();
  ALabel::update();

  // register for hyprland ipc
  gIPC->registerForIPC("activelayout", this);
}

Language::~Language() {
  gIPC->unregisterForIPC(this);
  // wait for possible event handler to finish
  std::lock_guard<std::mutex> lg(mutex_);
}

auto Language::update() -> void {
  std::lock_guard<std::mutex> lg(mutex_);

  if (!format_.empty()) {
    label_.show();
    label_.set_markup(layoutName_);
  } else {
    label_.hide();
  }

  ALabel::update();
}

void Language::onEvent(const std::string& ev) {
  std::lock_guard<std::mutex> lg(mutex_);
  auto layoutName = ev.substr(ev.find_last_of(',') + 1);
  auto kbName = ev.substr(0, ev.find_last_of(','));
  kbName = kbName.substr(kbName.find_first_of('>') + 2);

  if (config_.isMember("keyboard-name") && kbName != config_["keyboard-name"].asString())
    return;  // ignore

  const auto briefName = getShortFrom(layoutName);

  if (config_.isMember("format-" + briefName)) {
    const auto propName = "format-" + briefName;
    layoutName = fmt::format(format_, config_[propName].asString());
  } else {
    layoutName = fmt::format(format_, layoutName);
  }

  layoutName = waybar::util::sanitize_string(layoutName);

  if (layoutName == layoutName_) return;

  layoutName_ = layoutName;

  spdlog::debug("hyprland language onevent with {}", layoutName);

  dp.emit();
}

void Language::initLanguage() {
  const auto inputDevices = gIPC->getSocket1Reply("devices");

  const auto kbName = config_["keyboard-name"].asString();

  try {
    auto searcher = kbName.empty()
                        ? inputDevices
                        : inputDevices.substr(inputDevices.find(kbName) + kbName.length());
    searcher = searcher.substr(searcher.find("keymap:") + 8);
    searcher = searcher.substr(0, searcher.find_first_of("\n\t"));

    auto layoutName = std::string{};
    const auto briefName = getShortFrom(searcher);

    if (config_.isMember("format-" + briefName)) {
      const auto propName = "format-" + briefName;
      layoutName = fmt::format(format_, config_[propName].asString());
    } else {
      layoutName = fmt::format(format_, searcher);
    }

    layoutName = waybar::util::sanitize_string(layoutName);

    layoutName_ = layoutName;

    spdlog::debug("hyprland language initLanguage found {}", layoutName_);

    dp.emit();

  } catch (std::exception& e) {
    spdlog::error("hyprland language initLanguage failed with {}", e.what());
  }
}

std::string Language::getShortFrom(const std::string& fullName) {
  const auto CONTEXT = rxkb_context_new(RXKB_CONTEXT_LOAD_EXOTIC_RULES);
  rxkb_context_parse_default_ruleset(CONTEXT);

  std::string foundName = "";
  rxkb_layout* layout = rxkb_layout_first(CONTEXT);
  while (layout) {
    std::string nameOfLayout = rxkb_layout_get_description(layout);

    if (nameOfLayout != fullName) {
      layout = rxkb_layout_next(layout);
      continue;
    }

    std::string briefName = rxkb_layout_get_brief(layout);

    rxkb_context_unref(CONTEXT);

    return briefName;
  }

  rxkb_context_unref(CONTEXT);

  return "";
}

}  // namespace waybar::modules::hyprland