From dfeb19b0a83b8ce57d28bf94a4f8d129993d1064 Mon Sep 17 00:00:00 2001
From: Joel Klinghed <the_jk@opera.com>
Date: Mon, 12 Jan 2026 23:06:20 +0100
Subject: Initial commit

---
 src/args.cc               | 389 ++++++++++++++++++++++++++++
 src/args.hh               |  64 +++++
 src/dbus_common.cc        |   7 +
 src/dbus_common.hh        |  14 ++
 src/find_desktop.cc       | 152 +++++++++++
 src/find_desktop.hh       |  10 +
 src/main.cc               |  59 +++++
 src/monitor.cc            | 626 ++++++++++++++++++++++++++++++++++++++++++++++
 src/monitor.hh            |  13 +
 src/notify.cc             |  59 +++++
 src/notify.hh             |  12 +
 src/xcb_atoms.cc          |  81 ++++++
 src/xcb_atoms.hh          |  57 +++++
 src/xcb_colors.cc         |  96 +++++++
 src/xcb_colors.hh         |  57 +++++
 src/xcb_connection.cc     |  25 ++
 src/xcb_connection.hh     |  28 +++
 src/xcb_event.hh          |  30 +++
 src/xcb_resource.cc       |  41 +++
 src/xcb_resource.hh       |  99 ++++++++
 src/xcb_resources.hh      |  35 +++
 src/xcb_resources_none.cc |  37 +++
 src/xcb_resources_xrm.cc  |  74 ++++++
 src/xcb_xkb.cc            | 167 +++++++++++++
 src/xcb_xkb.hh            |  30 +++
 25 files changed, 2262 insertions(+)
 create mode 100644 src/args.cc
 create mode 100644 src/args.hh
 create mode 100644 src/dbus_common.cc
 create mode 100644 src/dbus_common.hh
 create mode 100644 src/find_desktop.cc
 create mode 100644 src/find_desktop.hh
 create mode 100644 src/main.cc
 create mode 100644 src/monitor.cc
 create mode 100644 src/monitor.hh
 create mode 100644 src/notify.cc
 create mode 100644 src/notify.hh
 create mode 100644 src/xcb_atoms.cc
 create mode 100644 src/xcb_atoms.hh
 create mode 100644 src/xcb_colors.cc
 create mode 100644 src/xcb_colors.hh
 create mode 100644 src/xcb_connection.cc
 create mode 100644 src/xcb_connection.hh
 create mode 100644 src/xcb_event.hh
 create mode 100644 src/xcb_resource.cc
 create mode 100644 src/xcb_resource.hh
 create mode 100644 src/xcb_resources.hh
 create mode 100644 src/xcb_resources_none.cc
 create mode 100644 src/xcb_resources_xrm.cc
 create mode 100644 src/xcb_xkb.cc
 create mode 100644 src/xcb_xkb.hh

(limited to 'src')

diff --git a/src/args.cc b/src/args.cc
new file mode 100644
index 0000000..1794941
--- /dev/null
+++ b/src/args.cc
@@ -0,0 +1,389 @@
+#include "args.hh"
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <format>
+#include <iostream>
+#include <map>
+#include <memory>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+namespace {
+
+std::string kEmpty;
+
+class OptionImpl : public Args::OptionArgument {
+ public:
+  enum Type : uint8_t {
+    NoArgument,
+    RequiredArgument,
+    OptionalArgument,
+  };
+
+  OptionImpl(Type type, char shortname, std::string longname, std::string arg,
+             std::string help)
+      : type(type),
+        shortname(shortname),
+        longname(std::move(longname)),
+        arg(std::move(arg)),
+        help(std::move(help)) {}
+
+  const Type type;
+  const char shortname;
+  const std::string longname;
+  const std::string arg;
+  const std::string help;
+
+  [[nodiscard]] bool is_set() const override { return is_set_; }
+
+  [[nodiscard]] bool has_argument() const override {
+    return value_.has_value();
+  }
+
+  [[nodiscard]] const std::string& argument() const override {
+    if (value_.has_value())
+      return value_.value();
+    assert(false);
+    return kEmpty;
+  }
+
+  void clear() {
+    is_set_ = false;
+    value_.reset();
+  }
+
+  void set_argument(std::string value) {
+    assert(type == Type::RequiredArgument || type == Type::OptionalArgument);
+    is_set_ = true;
+    value_ = std::move(value);
+  }
+
+  void set_no_argument() {
+    assert(type == Type::NoArgument || type == Type::OptionalArgument);
+    is_set_ = true;
+    value_.reset();
+  }
+
+ private:
+  bool is_set_{false};
+  std::optional<std::string> value_;
+};
+
+class ArgsImpl : public Args {
+ public:
+  explicit ArgsImpl(std::string prgname) : prgname_(std::move(prgname)) {}
+
+  std::shared_ptr<Option> option(char shortname, std::string longname,
+                                 std::string help) override {
+    auto opt = std::make_shared<OptionImpl>(
+        OptionImpl::Type::NoArgument, shortname, std::move(longname),
+        /* arg */ std::string(), std::move(help));
+    add(opt);
+    return opt;
+  }
+
+  std::shared_ptr<OptionArgument> option_argument(char shortname,
+                                                  std::string longname,
+                                                  std::string arg,
+                                                  std::string help,
+                                                  bool required) override {
+    auto opt = std::make_shared<OptionImpl>(
+        required ? OptionImpl::Type::RequiredArgument
+                 : OptionImpl::Type::OptionalArgument,
+        shortname, std::move(longname), std::move(arg), std::move(help));
+    add(opt);
+    return opt;
+  }
+
+  bool run(int argc, char** argv,
+           std::vector<std::string_view>* arguments = nullptr) override {
+    last_error_.clear();
+    for (auto& opt : options_) {
+      opt->clear();
+    }
+
+    std::string_view prgname;
+    if (prgname_.empty()) {
+      if (argc > 0)
+        prgname = argv[0];
+    } else {
+      prgname = prgname_;
+    }
+
+    for (int a = 1; a < argc; ++a) {
+      assert(argv[a]);
+      if (argv[a][0] == '-' && argv[a][1] != '\0') {
+        if (argv[a][1] == '-') {
+          // long option
+          size_t eq = 2;
+          while (argv[a][eq] != '=' && argv[a][eq] != '\0')
+            ++eq;
+          size_t end = eq;
+          while (argv[a][end] != '\0')
+            ++end;
+
+          if (end == 2) {
+            // "--", no more options signal
+            if (arguments) {
+              for (++a; a < argc; ++a)
+                arguments->emplace_back(argv[a]);
+            }
+            break;
+          }
+
+          auto name = std::string_view(argv[a] + 2, eq - 2);
+          auto it = long_.find(name);
+          if (it == long_.end()) {
+            last_error_ =
+                std::format("{}: unrecognized option '--{}'", prgname, name);
+            return false;
+          }
+          auto& opt = options_[it->second];
+
+          if (eq < end) {
+            // long option with argument after equal sign
+            switch (opt->type) {
+              case OptionImpl::Type::NoArgument:
+                last_error_ =
+                    std::format("{}: option '--{}' doesn't allow an argument",
+                                prgname, name);
+                return false;
+              case OptionImpl::Type::RequiredArgument:
+              case OptionImpl::Type::OptionalArgument:
+                opt->set_argument(
+                    std::string(argv[a] + eq + 1, end - (eq + 1)));
+                break;
+            }
+          } else {
+            switch (opt->type) {
+              case OptionImpl::Type::NoArgument:
+              case OptionImpl::Type::OptionalArgument:
+                opt->set_no_argument();
+                break;
+              case OptionImpl::Type::RequiredArgument:
+                if (++a >= argc) {
+                  last_error_ = std::format(
+                      "{}: option '--{}' requires an argument", prgname, name);
+                  return false;
+                }
+                opt->set_argument(argv[a]);
+                break;
+            }
+          }
+        } else {
+          // short options
+          char* current = argv[a] + 1;
+          for (; *current; ++current) {
+            auto it = short_.find(*current);
+            if (it == short_.end()) {
+              last_error_ =
+                  std::format("{}: invalid option -- '{}'", prgname, *current);
+              return false;
+            }
+
+            auto& opt = options_[it->second];
+            switch (opt->type) {
+              case OptionImpl::Type::NoArgument:
+              case OptionImpl::Type::OptionalArgument:
+                opt->set_no_argument();
+                break;
+              case OptionImpl::Type::RequiredArgument:
+                if (++a >= argc) {
+                  last_error_ =
+                      std::format("{}: option requires an argument -- '{}'",
+                                  prgname, *current);
+                  return false;
+                }
+                opt->set_argument(argv[a]);
+                break;
+            }
+          }
+        }
+      } else {
+        if (arguments)
+          arguments->emplace_back(argv[a]);
+      }
+    }
+    return true;
+  }
+
+  void print_error(std::ostream& out) const override {
+    if (last_error_.empty())
+      return;
+
+    out << last_error_ << '\n';
+  }
+
+  void print_help(std::ostream& out, uint32_t width = 79) const override {
+    if (options_.empty())
+      return;
+
+    uint32_t indent = 0;
+    const uint32_t max_need = width / 2;
+    std::vector<uint32_t> option_need;
+    for (auto const& opt : options_) {
+      uint32_t need;
+      if (opt->longname.empty()) {
+        need = 4;  // -O
+        switch (opt->type) {
+          case OptionImpl::Type::NoArgument:
+          case OptionImpl::Type::OptionalArgument:
+            break;
+          case OptionImpl::Type::RequiredArgument:
+            need += 1 + (opt->arg.empty() ? 3 : opt->arg.size());
+            break;
+        }
+      } else {
+        need = 8 + opt->longname.size();  // -O, --option
+        switch (opt->type) {
+          case OptionImpl::Type::NoArgument:
+            break;
+          case OptionImpl::Type::RequiredArgument:
+            // =ARG
+            need += 1 + (opt->arg.empty() ? 3 : opt->arg.size());
+            break;
+          case OptionImpl::Type::OptionalArgument:
+            // [=ARG]
+            need += 3 + (opt->arg.empty() ? 3 : opt->arg.size());
+            break;
+        }
+      }
+      need += 2;  // margin
+
+      option_need.emplace_back(need);
+      if (need <= max_need) {
+        indent = std::max(indent, need);
+      }
+    }
+
+    print_wrap(out, width, /* indent */ 0,
+               "Mandatory arguments to long options"
+               " are mandatory for short options too.");
+    auto need_it = option_need.begin();
+    for (auto const& opt : options_) {
+      if (opt->longname.empty()) {
+        out << "  -" << opt->shortname;
+        switch (opt->type) {
+          case OptionImpl::Type::NoArgument:
+          case OptionImpl::Type::OptionalArgument:
+            break;
+          case OptionImpl::Type::RequiredArgument:
+            out << " " << (opt->arg.empty() ? "ARG" : opt->arg);
+            break;
+        }
+      } else {
+        if (opt->shortname != '\0') {
+          out << "  -" << opt->shortname << ", --";
+        } else {
+          out << "      --";
+        }
+        out << opt->longname;
+        switch (opt->type) {
+          case OptionImpl::Type::NoArgument:
+            break;
+          case OptionImpl::Type::RequiredArgument:
+            out << "=" << (opt->arg.empty() ? "ARG" : opt->arg);
+            break;
+          case OptionImpl::Type::OptionalArgument:
+            out << "=[" << (opt->arg.empty() ? "ARG" : opt->arg) << ']';
+            break;
+        }
+      }
+
+      auto need = *need_it++;
+      if (need > max_need) {
+        out << '\n';
+        if (!opt->help.empty()) {
+          print_wrap(out, width, 0, opt->help);
+        }
+      } else {
+        if (opt->help.empty()) {
+          out << '\n';
+        } else {
+          out << "  ";  // add margin, already included in need
+          while (need++ < indent)
+            out << ' ';
+          print_wrap(out, width, indent, opt->help);
+        }
+      }
+    }
+  }
+
+ private:
+  void add(std::shared_ptr<OptionImpl> opt) {
+    if (opt->shortname == '\0' && opt->longname.empty()) {
+      assert(false);
+    } else {
+      auto idx = options_.size();
+      if (opt->shortname != '\0')
+        short_.emplace(opt->shortname, idx);
+      if (!opt->longname.empty())
+        long_.emplace(opt->longname, idx);
+    }
+    options_.emplace_back(std::move(opt));
+  }
+
+  static inline bool is_whitespace(char c) { return c == ' ' || c == '\t'; }
+
+  static void print_wrap(std::ostream& out, uint32_t width, uint32_t indent,
+                         const std::string& str) {
+    if (indent + str.size() <= width) {
+      out << str << '\n';
+      return;
+    }
+    if (width <= indent || indent + 10 > width) {
+      out << '\n';
+      out << str << '\n';
+      return;
+    }
+    const std::string indent_str(indent, ' ');
+    const uint32_t avail = width - indent;
+    size_t offset = 0;
+    while (offset + avail < str.size()) {
+      uint32_t i = avail;
+      while (i > 0 && !is_whitespace(str[offset + i]))
+        --i;
+      if (i == 0) {
+        out << str.substr(offset, avail - 1);
+        out << "-\n";
+        offset += avail - 1;
+      } else {
+        out << str.substr(offset, i);
+        out << '\n';
+        offset += i;
+      }
+      out << indent_str;
+    }
+    out << str.substr(offset);
+    out << '\n';
+  }
+
+  const std::string prgname_;
+  std::vector<std::shared_ptr<OptionImpl>> options_;
+  std::map<char, size_t> short_;
+  std::map<std::string_view, size_t> long_;
+  std::string last_error_;
+};
+
+}  // namespace
+
+std::shared_ptr<Args::Option> Args::option(std::string longname,
+                                           std::string help) {
+  return option(/* shortname */ '\0', std::move(longname), std::move(help));
+}
+
+std::shared_ptr<Args::OptionArgument> Args::option_argument(
+    std::string longname, std::string arg, std::string help, bool required) {
+  return option_argument(/* shortname */ '\0', std::move(longname),
+                         std::move(arg), std::move(help), required);
+}
+
+std::unique_ptr<Args> Args::create(std::string prgname) {
+  return std::make_unique<ArgsImpl>(std::move(prgname));
+}
diff --git a/src/args.hh b/src/args.hh
new file mode 100644
index 0000000..14f3716
--- /dev/null
+++ b/src/args.hh
@@ -0,0 +1,64 @@
+#ifndef ARGS_HH
+#define ARGS_HH
+
+#include <cstdint>
+#include <iosfwd>
+#include <memory>
+#include <string>
+#include <string_view>
+#include <vector>
+
+class Args {
+ public:
+  virtual ~Args() = default;
+
+  class Option {
+   public:
+    virtual ~Option() = default;
+
+    [[nodiscard]] virtual bool is_set() const = 0;
+
+   protected:
+    Option() = default;
+    Option(Option const&) = delete;
+    Option& operator=(Option const&) = delete;
+  };
+
+  class OptionArgument : public Option {
+   public:
+    [[nodiscard]] virtual bool has_argument() const = 0;
+    [[nodiscard]] virtual const std::string& argument() const = 0;
+  };
+
+  static std::unique_ptr<Args> create(std::string prgname = std::string());
+
+  virtual std::shared_ptr<Option> option(char shortname,
+                                         std::string longname = std::string(),
+                                         std::string help = std::string()) = 0;
+
+  std::shared_ptr<Option> option(std::string longname,
+                                 std::string help = std::string());
+
+  virtual std::shared_ptr<OptionArgument> option_argument(
+      char shortname, std::string longname = std::string(),
+      std::string arg = std::string(), std::string help = std::string(),
+      bool required = true) = 0;
+
+  std::shared_ptr<OptionArgument> option_argument(
+      std::string longname, std::string arg = std::string(),
+      std::string help = std::string(), bool required = true);
+
+  virtual bool run(int argc, char** argv,
+                   std::vector<std::string_view>* arguments = nullptr) = 0;
+
+  virtual void print_error(std::ostream& out) const = 0;
+
+  virtual void print_help(std::ostream& out, uint32_t width = 79) const = 0;
+
+ protected:
+  Args() = default;
+  Args(Args const&) = delete;
+  Args& operator=(Args const&) = delete;
+};
+
+#endif  // ARGS_HH
diff --git a/src/dbus_common.cc b/src/dbus_common.cc
new file mode 100644
index 0000000..c3f7f2b
--- /dev/null
+++ b/src/dbus_common.cc
@@ -0,0 +1,7 @@
+#include "dbus_common.hh"
+
+#include <sdbus-c++/sdbus-c++.h>
+
+const sdbus::ServiceName dbus::kServiceName{"org.the_jk.claudemon"};
+const sdbus::ObjectPath dbus::kObjectPath{"/org/the_jk/claudemon/notify"};
+const sdbus::InterfaceName dbus::kInterfaceName{"org.the_jk.claudemon.Notify"};
diff --git a/src/dbus_common.hh b/src/dbus_common.hh
new file mode 100644
index 0000000..b4f7501
--- /dev/null
+++ b/src/dbus_common.hh
@@ -0,0 +1,14 @@
+#ifndef DBUS_COMMON_HH
+#define DBUS_COMMON_HH
+
+#include <sdbus-c++/sdbus-c++.h>
+
+namespace dbus {
+
+extern const sdbus::ServiceName kServiceName;
+extern const sdbus::ObjectPath kObjectPath;
+extern const sdbus::InterfaceName kInterfaceName;
+
+}  // namespace dbus
+
+#endif  // DBUS_COMMON_HH
diff --git a/src/find_desktop.cc b/src/find_desktop.cc
new file mode 100644
index 0000000..a3a9330
--- /dev/null
+++ b/src/find_desktop.cc
@@ -0,0 +1,152 @@
+#include "find_desktop.hh"
+
+#include "xcb_atoms.hh"
+#include "xcb_connection.hh"
+#include "xcb_event.hh"
+#include "xcb_resource.hh"
+
+#include <cassert>
+#include <charconv>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <optional>
+#include <string>
+#include <system_error>
+#include <xcb/xproto.h>
+
+namespace {
+
+int get_from_e17_using_window(xcb_connection_t* conn, xcb_window_t wnd,
+                              xcb_atom_t e_window_desk) {
+  if (e_window_desk == XCB_ATOM_NONE) {
+    return -1;
+  }
+
+  for (int i = 0; i < 2; ++i) {
+    auto cookie =
+        xcb_get_property(conn, 0, wnd, e_window_desk, XCB_ATOM_CARDINAL, 0, 2);
+    xcb::reply<xcb_get_property_reply_t> reply(
+        xcb_get_property_reply(conn, cookie, nullptr));
+
+    if (reply && reply->format == 32 &&
+        xcb_get_property_value_length(reply.get()) >= 8) {
+      auto* data = static_cast<uint32_t*>(xcb_get_property_value(reply.get()));
+      auto x = data[0];
+      auto y = data[1];
+      return static_cast<int>((x * 256) + y);
+    }
+
+    xcb_flush(conn);
+    struct timespec ts = {.tv_sec = 0, .tv_nsec = 250000000};  // 250ms
+    nanosleep(&ts, nullptr);
+  }
+  return -1;
+}
+
+std::string create_desktop(std::string const& prefix, int desktop,
+                           bool use_prefix) {
+  std::string ret;
+  if (use_prefix) {
+    ret.append(prefix);
+    ret.push_back('_');
+  }
+  auto const offset = ret.size();
+  ret.resize(offset + 10);
+  auto [ptr, ec] =
+      std::to_chars(ret.data() + offset, ret.data() + ret.size(), desktop);
+  if (ec == std::errc()) {
+    ret.resize(ptr - ret.data());
+  } else {
+    assert(false);
+    ret.resize(offset);
+  }
+  return ret;
+}
+
+}  // namespace
+
+std::optional<std::string> find_desktop(std::optional<std::string> display,
+                                        bool use_prefix) {
+  int screen_num = 0;
+  auto conn = xcb::make_shared_conn(xcb_connect(
+      display.has_value() ? display.value().c_str() : nullptr, &screen_num));
+  if (!conn || xcb_connection_has_error(conn.get())) {
+    return std::nullopt;
+  }
+
+  auto atoms = xcb::Atoms::create(conn);
+  if (!atoms) {
+    return std::nullopt;
+  }
+
+  auto* screen = xcb::get_screen(conn.get(), screen_num);
+  if (!screen) {
+    return std::nullopt;
+  }
+
+  xcb_window_t root = screen->root;
+
+  auto net_current_desktop_atom = atoms->get("_NET_CURRENT_DESKTOP");
+  auto e_window_desk_atom = atoms->get("__E_WINDOW_DESK");
+
+  if (!atoms->sync()) {
+    return std::nullopt;
+  }
+
+  auto* desktop_env = getenv("DESKTOP");
+  if (!desktop_env || strncmp(desktop_env, "Enlightenment-0.17", 18) != 0) {
+    /* Skip _NET_CURRENT_DESKTOP if we're in e17 */
+    /* Try to read the _NET_CURRENT_DESKTOP property */
+    auto net_current_desktop = net_current_desktop_atom.get();
+    if (net_current_desktop != XCB_ATOM_NONE) {
+      auto cookie = xcb_get_property(conn.get(), 0, root, net_current_desktop,
+                                     XCB_ATOM_CARDINAL, 0, 1);
+      xcb::reply<xcb_get_property_reply_t> reply(
+          xcb_get_property_reply(conn.get(), cookie, nullptr));
+
+      if (reply && reply->format == 32 &&
+          xcb_get_property_value_length(reply.get()) >= 4) {
+        auto* data =
+            static_cast<uint32_t*>(xcb_get_property_value(reply.get()));
+        return create_desktop("ewmh", static_cast<int>(data[0]), use_prefix);
+      }
+    }
+  }
+
+  /* Failing that, let's see if our owner knows */
+  auto* windowid_env = getenv("WINDOWID");
+  if (windowid_env) {
+    auto* const end = windowid_env + strlen(windowid_env);
+    unsigned long windowid;
+    auto [ptr, ec] = std::from_chars(windowid_env, end, windowid);
+    if (ptr == end && ec == std::errc{}) {
+      auto ret = get_from_e17_using_window(conn.get(),
+                                           static_cast<xcb_window_t>(windowid),
+                                           e_window_desk_atom.get());
+      if (ret != -1) {
+        return create_desktop("enlightenment", ret, use_prefix);
+      }
+    }
+  }
+
+  /* Try creating a bogus window then */
+  {
+    auto wnd = xcb::make_unique_wnd(conn);
+    xcb_create_window(conn.get(), XCB_COPY_FROM_PARENT, wnd->id(), root, 0, 0,
+                      1, 1, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
+                      XCB_COPY_FROM_PARENT, 0, nullptr);
+    xcb_map_window(conn.get(), wnd->id());
+    xcb_flush(conn.get());
+
+    auto ret = get_from_e17_using_window(conn.get(), wnd->id(),
+                                         e_window_desk_atom.get());
+    if (ret != -1) {
+      return create_desktop("enlightenment", ret, use_prefix);
+    }
+  }
+
+  /* Don't know what else to do */
+  return std::nullopt;
+}
diff --git a/src/find_desktop.hh b/src/find_desktop.hh
new file mode 100644
index 0000000..f066d68
--- /dev/null
+++ b/src/find_desktop.hh
@@ -0,0 +1,10 @@
+#ifndef FIND_DESKTOP_HH
+#define FIND_DESKTOP_HH
+
+#include <optional>
+#include <string>
+
+std::optional<std::string> find_desktop(std::optional<std::string> display,
+                                        bool use_prefix);
+
+#endif  // FIND_DESKTOP_HH
diff --git a/src/main.cc b/src/main.cc
new file mode 100644
index 0000000..c37ee6a
--- /dev/null
+++ b/src/main.cc
@@ -0,0 +1,59 @@
+#include "args.hh"
+#include "monitor.hh"
+#include "notify.hh"
+
+#include <iostream>
+#include <optional>
+#include <string_view>
+#include <vector>
+
+#ifndef VERSION
+# define VERSION ""
+#endif
+
+int main(int argc, char** argv) {
+  auto args = Args::create();
+  auto help = args->option('h', "help", "display this text and exit.");
+  auto version = args->option('V', "version", "display version and exit.");
+  auto opt_font_name = args->option_argument(
+      'F', "font", "use font named FONT instead of default or Xresources.",
+      "FONT");
+  auto opt_display = args->option_argument(
+      'D', "display", "connect to DISPLAY instead of default.", "DISPLAY");
+  auto notify = args->option('N', "notification", "claude notification .");
+  std::vector<std::string_view> arguments;
+  if (!args->run(argc, argv, &arguments)) {
+    args->print_error(std::cerr);
+    std::cerr << "Try `claudemon --help` for usage.\n";
+    return EXIT_FAILURE;
+  }
+  if (help->is_set()) {
+    std::cout << "Usage: `claudemon [OPTIONS]`\n"
+              << "Monitors claude.\n"
+              << "\n";
+    args->print_help(std::cout);
+    return EXIT_SUCCESS;
+  }
+  if (version->is_set()) {
+    std::cout << "Timer " VERSION " written by "
+              << "Joel Klinghed <the_jk@spawned.biz>\n";
+    return EXIT_SUCCESS;
+  }
+  if (!arguments.empty()) {
+    std::cerr << "Unexpected arguments after options.\n"
+              << "Try `claudemon --help` for usage.\n";
+    return EXIT_FAILURE;
+  }
+
+  if (notify->is_set()) {
+    return Notify::run(opt_display->has_argument()
+                           ? opt_display->argument()
+                           : std::optional<std::string>());
+  }
+
+  return Monitor::run(
+      opt_display->has_argument() ? opt_display->argument()
+                                  : std::optional<std::string>(),
+      opt_font_name->has_argument() ? opt_font_name->argument()
+                                    : std::optional<std::string>());
+}
diff --git a/src/monitor.cc b/src/monitor.cc
new file mode 100644
index 0000000..d19db4c
--- /dev/null
+++ b/src/monitor.cc
@@ -0,0 +1,626 @@
+#include "monitor.hh"
+
+#include "dbus_common.hh"
+#include "xcb_atoms.hh"
+#include "xcb_colors.hh"
+#include "xcb_connection.hh"
+#include "xcb_event.hh"
+#include "xcb_resource.hh"
+#include "xcb_resources.hh"
+#include "xcb_xkb.hh"
+
+#include <algorithm>
+#include <cassert>
+#include <condition_variable>
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <iostream>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <sdbus-c++/sdbus-c++.h>
+#include <string>
+#include <thread>
+#include <utility>
+#include <vector>
+#include <xcb/xcb_event.h>
+#include <xcb/xcb_icccm.h>
+#include <xcb/xproto.h>
+
+namespace {
+
+constexpr char const kTitle[] = "Claude Code Monitor";
+constexpr char const kClass[] = "org.the_jk.claudemon";
+
+class Server {
+ public:
+  class Delegate {
+   public:
+    virtual ~Delegate() = default;
+
+    virtual void notify(std::string const& session_id,
+                        std::string const& event_name,
+                        std::optional<std::string> const& cwd,
+                        std::optional<std::string> const& notification_type,
+                        std::optional<std::string> const& desktop) = 0;
+
+   protected:
+    Delegate() = default;
+  };
+
+  explicit Server(Delegate* delegate) : delegate_(delegate) {}
+
+  virtual ~Server() {
+    if (conn_)
+      conn_->leaveEventLoop();
+    thread_.join();
+  }
+
+  bool init() {
+    try {
+      conn_ = sdbus::createBusConnection(dbus::kServiceName);
+      object_ = sdbus::createObject(*conn_, dbus::kObjectPath);
+
+      object_
+          ->addVTable(sdbus::registerMethod("notify").implementedAs(
+              [this](std::string const& session_id,
+                     std::string const& event_name, std::string const& cwd,
+                     std::string const& notification_type,
+                     std::string const& desktop) {
+                delegate_->notify(
+                    session_id, event_name,
+                    cwd.empty() ? std::optional<std::string>() : cwd,
+                    notification_type.empty() ? std::optional<std::string>()
+                                              : notification_type,
+                    desktop.empty() ? std::optional<std::string>() : desktop);
+              }))
+          .forInterface(dbus::kInterfaceName);
+
+      thread_ = std::thread(&Server::run, this);
+
+      return true;
+    } catch (sdbus::Error const& err) {
+      std::cerr << "Failed to init server: " << err.what() << '\n';
+      return false;
+    }
+  }
+
+ private:
+  void run() { conn_->enterEventLoop(); }
+
+  Delegate* const delegate_;
+  std::shared_ptr<sdbus::IConnection> conn_;
+  std::unique_ptr<sdbus::IObject> object_;
+  std::thread thread_;
+};
+
+class Ui : public Server::Delegate {
+  enum class State : uint8_t {
+    IDLE,
+    PROMPT,
+    BUSY,
+  };
+
+  struct Session {
+    State state{State::IDLE};
+    std::string cwd{"/"};
+    std::string desktop{"0"};
+    std::string name;
+  };
+
+ public:
+  Ui() : server_(std::make_unique<Server>(this)) {}
+
+  bool init() { return server_->init(); }
+
+  int run(std::optional<std::string> display,
+          std::optional<std::string> font_name) {
+    int screen_index = 0;
+    conn_ = xcb::make_shared_conn(
+        xcb_connect(display.has_value() ? display.value().c_str() : nullptr,
+                    &screen_index));
+
+    {
+      auto err = xcb_connection_has_error(conn_.get());
+      if (err) {
+        std::cerr << "Unable to connect to X display: " << err << '\n';
+        return EXIT_FAILURE;
+      }
+    }
+
+    auto atoms = xcb::Atoms::create(conn_);
+    string_atom_ = atoms->get("STRING");
+    wm_protocols_ = atoms->get("WM_PROTOCOLS");
+    wm_delete_window_ = atoms->get("WM_DELETE_WINDOW");
+
+    auto* screen = xcb::get_screen(conn_.get(), screen_index);
+    assert(screen);
+
+    auto colors = xcb::Colors::create(conn_, screen->default_colormap);
+    background_ =
+        colors->get_with_fallback(0x00, 0x00, 0x00, screen->black_pixel);
+    foreground_busy_ =
+        colors->get_with_fallback(0x96, 0x96, 0x96, screen->white_pixel);
+    foreground_prompt_ =
+        colors->get_with_fallback(0x96, 0x00, 0x00, screen->white_pixel);
+    foreground_idle_ =
+        colors->get_with_fallback(0x00, 0x96, 0x00, screen->white_pixel);
+
+    keyboard_ = xcb::Keyboard::create(conn_.get());
+    if (!keyboard_) {
+      std::cerr << "Failed to initialize XKB.\n";
+      return EXIT_FAILURE;
+    }
+
+    wnd_ = xcb::make_unique_wnd(conn_);
+    gc_ = xcb::make_unique_gc(conn_);
+    font_ = xcb::make_unique_font(conn_);
+
+    if (!font_name.has_value()) {
+      auto resources = xcb::Resources::create(conn_);
+      font_name = resources->get_string("claudemon.font", "");
+      if (!font_name.has_value()) {
+        font_name = "fixed";
+      }
+    }
+
+    auto font_cookie = xcb_open_font_checked(
+        conn_.get(), font_->id(), font_name->size(), font_name->data());
+
+    if (!atoms->sync()) {
+      std::cerr << "Failed to get X atoms.\n";
+      return EXIT_FAILURE;
+    }
+    if (!colors->sync()) {
+      std::cerr << "Failed to get X colors.\n";
+      return EXIT_FAILURE;
+    }
+
+    uint32_t value_list[3];
+    uint32_t value_mask = 0;
+    value_mask |= XCB_CW_BACK_PIXEL;
+    value_list[0] = screen->black_pixel;
+    value_mask |= XCB_CW_EVENT_MASK;
+    value_list[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
+                    XCB_EVENT_MASK_BUTTON_PRESS |
+                    XCB_EVENT_MASK_STRUCTURE_NOTIFY;
+    xcb_create_window(conn_.get(), XCB_COPY_FROM_PARENT, wnd_->id(),
+                      screen->root, 0, 0, wnd_width_, wnd_height_, 0,
+                      XCB_WINDOW_CLASS_INPUT_OUTPUT, screen->root_visual,
+                      value_mask, value_list);
+
+    xcb_icccm_set_wm_name(conn_.get(), wnd_->id(), string_atom_->get(), 8,
+                          sizeof(kTitle) - 1, kTitle);
+    xcb_icccm_set_wm_class(conn_.get(), wnd_->id(), sizeof(kClass) - 1, kClass);
+    xcb_atom_t atom_list[1];
+    atom_list[0] = wm_delete_window_->get();
+    xcb_icccm_set_wm_protocols(conn_.get(), wnd_->id(), wm_protocols_->get(), 1,
+                               atom_list);
+
+    value_mask = XCB_GC_FONT;
+    value_list[0] = font_->id();
+    xcb_create_gc(conn_.get(), gc_->id(), wnd_->id(), value_mask, value_list);
+
+    {
+      xcb::generic_error error(xcb_request_check(conn_.get(), font_cookie));
+      if (error) {
+        std::cerr << "Failed to load font " << *font_name << ": "
+                  << static_cast<int>(error->error_code) << '\n';
+        return EXIT_FAILURE;
+      }
+    }
+
+    update_lines();
+
+    xcb_map_window(conn_.get(), wnd_->id());
+    xcb_flush(conn_.get());
+
+    std::thread xcb_thread(&Ui::run_xcb, this);
+
+    bool quit = false;
+    while (!quit) {
+      ActionData action;
+      {
+        std::unique_lock<std::mutex> lock(action_lock_);
+        while (action_.empty()) {
+          action_cond_.wait(lock);
+        }
+        action = action_.front();
+        action_.pop_front();
+      }
+
+      switch (action.action) {
+        case Action::QUIT:
+          quit = true;
+          break;
+        case Action::DRAW:
+          if (action.last) {
+            draw();
+          }
+          break;
+        case Action::RESIZE:
+          wnd_width_ = action.rect.width;
+          wnd_height_ = action.rect.height;
+          break;
+        case Action::NOTIFY: {
+          if (action.event_name == "SessionEnd") {
+            sessions_.erase(action.session_id);
+          } else {
+            auto& session = sessions_[action.session_id];
+            auto cwd = action.cwd.value_or("/");
+            if (session.cwd != cwd) {
+              session.cwd = std::move(cwd);
+              session.name.clear();
+            }
+            auto desktop = action.desktop.value_or("0");
+            if (session.desktop != desktop) {
+              session.desktop = std::move(desktop);
+              session.name.clear();
+            }
+            if (action.event_name == "Notification" &&
+                action.notification_type.has_value()) {
+              if (action.notification_type.value() == "permission_prompt" ||
+                  action.notification_type.value() == "elicitation_dialog") {
+                session.state = State::PROMPT;
+              } else if (action.notification_type.value() == "idle_prompt") {
+                session.state = State::IDLE;
+              }
+            } else if (action.event_name == "UserPromptSubmit") {
+              session.state = State::BUSY;
+            }
+          }
+          update_lines();
+          draw();
+          break;
+        }
+        case Action::RESET:
+          sessions_.clear();
+          update_lines();
+          draw();
+          break;
+      }
+    }
+
+    xcb_thread.join();
+    return true;
+  }
+
+  void notify(std::string const& session_id, std::string const& event_name,
+              std::optional<std::string> const& cwd,
+              std::optional<std::string> const& notification_type,
+              std::optional<std::string> const& desktop) override {
+    post(Action::NOTIFY, session_id, event_name, cwd, notification_type,
+         desktop);
+  }
+
+ private:
+  enum class Action : uint8_t {
+    QUIT,
+    DRAW,
+    RESIZE,
+    NOTIFY,
+    RESET,
+  };
+
+  struct Line {
+    std::vector<xcb_char2b_t> text;
+    xcb_query_text_extents_cookie_t text_extents_cookie;
+    uint16_t text_extents_width{0};
+    uint16_t text_extents_height{0};
+    uint16_t text_extents_offset{0};
+    uint32_t color{0};
+  };
+
+  struct ActionData {
+    Action action;
+    xcb_rectangle_t rect;
+    bool last;
+    std::string session_id;
+    std::string event_name;
+    std::optional<std::string> cwd;
+    std::optional<std::string> notification_type;
+    std::optional<std::string> desktop;
+
+    ActionData() = default;
+
+    explicit ActionData(Action action) : action(action) {
+      assert(action == Action::QUIT || action == Action::RESET);
+    }
+
+    ActionData(Action action, xcb_rectangle_t rect, bool last)
+        : action(action), rect(rect), last(last) {
+      assert(action == Action::DRAW);
+    }
+
+    ActionData(Action action, uint16_t width, uint16_t height)
+        : action(action),
+          rect({.x = 0, .y = 0, .width = width, .height = height}) {
+      assert(action == Action::RESIZE);
+    }
+
+    ActionData(Action action, std::string session_id, std::string event_name,
+               std::optional<std::string> cwd,
+               std::optional<std::string> notification_type,
+               std::optional<std::string> desktop)
+        : action(action),
+          session_id(std::move(session_id)),
+          event_name(std::move(event_name)),
+          cwd(std::move(cwd)),
+          notification_type(std::move(notification_type)),
+          desktop(std::move(desktop)) {
+      assert(action == Action::NOTIFY);
+    }
+  };
+
+  void run_xcb() {
+    while (true) {
+      xcb::generic_event event(xcb_wait_for_event(conn_.get()));
+      if (!event) {
+        auto err = xcb_connection_has_error(conn_.get());
+        if (err) {
+          std::cerr << "X connection had fatal error: " << err << '\n';
+        } else {
+          std::cerr << "X connection had fatal I/O error.\n";
+        }
+        break;
+      }
+      auto response_type = XCB_EVENT_RESPONSE_TYPE(event.get());
+      if (response_type == XCB_EXPOSE) {
+        auto* e = reinterpret_cast<xcb_expose_event_t*>(event.get());
+        if (e->window == wnd_->id()) {
+          xcb_rectangle_t rect;
+          rect.x = static_cast<int16_t>(e->x);
+          rect.y = static_cast<int16_t>(e->y);
+          rect.width = e->width;
+          rect.height = e->height;
+          post(Action::DRAW, rect, e->count == 0);
+        }
+        continue;
+      }
+      if (response_type == XCB_KEY_PRESS) {
+        auto* e = reinterpret_cast<xcb_key_press_event_t*>(event.get());
+        if (e->event == wnd_->id()) {
+          auto str = keyboard_->get_utf8(e);
+          if (str == "q" || str == "\x1b" /* Escape */) {
+            break;
+          }
+          if ((e->state & XCB_MOD_MASK_CONTROL) &&
+              str == "\x12" /* Ctrl + R */) {
+            post(Action::RESET);
+          }
+        }
+        continue;
+      }
+      if (response_type == XCB_CONFIGURE_NOTIFY) {
+        auto* e = reinterpret_cast<xcb_configure_notify_event_t*>(event.get());
+        if (e->window == wnd_->id()) {
+          post(Action::RESIZE, e->width, e->height);
+        }
+        continue;
+      }
+      if (response_type == XCB_REPARENT_NOTIFY) {
+        // Ignored, part of XCB_EVENT_MASK_STRUCTURE_NOTIFY
+        continue;
+      }
+      if (response_type == XCB_MAP_NOTIFY) {
+        // Ignored, part of XCB_EVENT_MASK_STRUCTURE_NOTIFY
+        continue;
+      }
+      if (keyboard_->handle_event(conn_.get(), event.get())) {
+        continue;
+      }
+      if (response_type == XCB_CLIENT_MESSAGE) {
+        auto* e = reinterpret_cast<xcb_client_message_event_t*>(event.get());
+        if (e->window == wnd_->id() && e->type == wm_protocols_->get() &&
+            e->format == 32) {
+          if (e->data.data32[0] == wm_delete_window_->get()) {
+            break;
+          }
+        }
+        continue;
+      }
+
+#ifndef NDEBUG
+      if (response_type == 0) {
+        auto* e = reinterpret_cast<xcb_generic_error_t*>(event.get());
+        std::cout << "Unhandled error: "
+                  << xcb_event_get_error_label(e->error_code) << '\n';
+      } else {
+        std::cout << "Unhandled event: " << xcb_event_get_label(response_type)
+                  << '\n';
+      }
+#endif
+    }
+
+    post(Action::QUIT);
+  }
+
+  template <class... Args>
+  void post(Args&&... args) {
+    bool notify;
+    {
+      std::scoped_lock lock(action_lock_);
+      notify = action_.empty();
+      action_.emplace_back(std::forward<Args>(args)...);
+    }
+    if (notify)
+      action_cond_.notify_one();
+  }
+
+  void update_names() {
+    if (sessions_.empty())
+      return;
+
+    if (std::ranges::all_of(sessions_,
+                            [](auto& it) { return !it.second.name.empty(); })) {
+      return;
+    }
+
+    auto it = sessions_.begin();
+    std::string common_path{it->second.cwd};
+    for (++it; it != sessions_.end(); ++it) {
+      auto& cwd = it->second.cwd;
+      size_t len = std::min(common_path.size(), cwd.size());
+      size_t i = 0;
+      for (; i < len; ++i) {
+        if (common_path[i] != cwd[i])
+          break;
+      }
+      common_path.resize(i);
+    }
+
+    if (!common_path.empty() && common_path.back() != '/') {
+      auto last = common_path.rfind('/');
+      if (last != std::string::npos) {
+        common_path = common_path.substr(0, last + 1);
+      } else {
+        common_path = "/";
+      }
+    }
+
+    for (auto& pair : sessions_) {
+      pair.second.name.clear();
+      pair.second.name.append(pair.second.desktop);
+      pair.second.name.append(": ");
+      auto suffix = pair.second.cwd.substr(common_path.size());
+      auto end = suffix.find('/');
+      if (end != std::string::npos)
+        suffix = suffix.substr(0, end);
+      pair.second.name.append(suffix);
+    }
+  }
+
+  void update_lines() {
+    update_names();
+
+    std::vector<std::map<std::string, Session>::const_iterator> sort;
+    for (auto it = sessions_.begin(); it != sessions_.end(); ++it) {
+      sort.emplace_back(it);
+    }
+    std::ranges::sort(
+        sort, [](auto& a, auto& b) { return a->second.name < b->second.name; });
+
+    lines_.resize(sessions_.size());
+    for (size_t i = 0; i < sort.size(); ++i) {
+      std::string line;
+      line.append(sort[i]->second.name);
+      line.append(": ");
+      switch (sort[i]->second.state) {
+        case State::BUSY:
+          line.append("busy");
+          lines_[i].color = foreground_busy_->get();
+          break;
+        case State::IDLE:
+          line.append("idle");
+          lines_[i].color = foreground_idle_->get();
+          break;
+        case State::PROMPT:
+          line.append("prompt");
+          lines_[i].color = foreground_prompt_->get();
+          break;
+      }
+
+      lines_[i].text.resize(line.size());
+      for (size_t j = 0; j < line.size(); ++j) {
+        lines_[i].text[j].byte1 = 0;
+        lines_[i].text[j].byte2 = line[j];
+      }
+
+      lines_[i].text_extents_cookie =
+          xcb_query_text_extents(conn_.get(), font_->id(),
+                                 lines_[i].text.size(), lines_[i].text.data());
+      lines_[i].text_extents_width = 0;
+    }
+  }
+
+  void draw() {
+    xcb_rectangle_t r{0, 0, wnd_width_, wnd_height_};
+
+    uint32_t values[2];
+    values[0] = background_->get();
+    xcb_change_gc(conn_.get(), gc_->id(), XCB_GC_FOREGROUND, values);
+    xcb_poly_fill_rectangle(conn_.get(), wnd_->id(), gc_->id(), 1, &r);
+
+    uint16_t tot_height = 0;
+    uint16_t max_width = 0;
+    uint16_t margin = 2;
+
+    for (auto& line : lines_) {
+      if (line.text_extents_width == 0) {
+        xcb::reply<xcb_query_text_extents_reply_t> reply(
+            xcb_query_text_extents_reply(conn_.get(), line.text_extents_cookie,
+                                         nullptr));
+        if (reply) {
+          line.text_extents_width = reply->overall_width;
+          line.text_extents_height = reply->font_ascent + reply->font_descent;
+          line.text_extents_offset = reply->font_ascent;
+        } else {
+          line.text_extents_width = 1;
+          line.text_extents_height = 0;
+          line.text_extents_offset = 0;
+        }
+      }
+      if (tot_height != 0)
+        tot_height += margin;
+      tot_height += line.text_extents_height;
+      max_width = std::max(line.text_extents_width, max_width);
+    }
+
+    auto x = static_cast<int16_t>(
+        max_width < wnd_width_ ? (wnd_width_ - max_width) / 2 : 0);
+    auto y = static_cast<int16_t>(
+        tot_height < wnd_height_ ? (wnd_height_ - tot_height) / 2 : 0);
+
+    for (auto& line : lines_) {
+      values[0] = line.color;
+      values[1] = background_->get();
+      xcb_change_gc(conn_.get(), gc_->id(),
+                    XCB_GC_FOREGROUND | XCB_GC_BACKGROUND, values);
+
+      xcb_image_text_16(conn_.get(), line.text.size(), wnd_->id(), gc_->id(), x,
+                        static_cast<int16_t>(y + line.text_extents_offset),
+                        line.text.data());
+
+      y = static_cast<int16_t>(y + line.text_extents_height + margin);
+    }
+
+    xcb_flush(conn_.get());
+  }
+
+  xcb::shared_conn conn_;
+  std::optional<xcb::Atoms::Reference> string_atom_;
+  std::optional<xcb::Atoms::Reference> wm_protocols_;
+  std::optional<xcb::Atoms::Reference> wm_delete_window_;
+  std::optional<xcb::Colors::Color> background_;
+  std::optional<xcb::Colors::Color> foreground_idle_;
+  std::optional<xcb::Colors::Color> foreground_busy_;
+  std::optional<xcb::Colors::Color> foreground_prompt_;
+  std::unique_ptr<xcb::Keyboard> keyboard_;
+  xcb::unique_wnd wnd_;
+  xcb::unique_gc gc_;
+  xcb::unique_font font_;
+  uint16_t wnd_width_{100};
+  uint16_t wnd_height_{150};
+
+  std::map<std::string, Session> sessions_;
+
+  std::vector<Line> lines_;
+
+  std::mutex action_lock_;
+  std::condition_variable action_cond_;
+  std::deque<ActionData> action_;
+
+  std::unique_ptr<Server> server_;
+};
+
+}  // namespace
+
+int Monitor::run(std::optional<std::string> display,
+                 std::optional<std::string> font_name) {
+  Ui ui;
+  if (!ui.init())
+    return EXIT_FAILURE;
+  return ui.run(std::move(display), std::move(font_name));
+}
diff --git a/src/monitor.hh b/src/monitor.hh
new file mode 100644
index 0000000..8861473
--- /dev/null
+++ b/src/monitor.hh
@@ -0,0 +1,13 @@
+#ifndef MONITOR_HH
+#define MONITOR_HH
+
+#include <optional>
+#include <string>
+
+class Monitor {
+ public:
+  static int run(std::optional<std::string> display,
+                 std::optional<std::string> font_name);
+};
+
+#endif  // MONITOR_HH
diff --git a/src/notify.cc b/src/notify.cc
new file mode 100644
index 0000000..2403dc6
--- /dev/null
+++ b/src/notify.cc
@@ -0,0 +1,59 @@
+#include "notify.hh"
+
+#include "dbus_common.hh"
+#include "find_desktop.hh"
+
+#include <iostream>
+#include <optional>
+#include <rapidjson/document.h>
+#include <rapidjson/error/en.h>
+#include <rapidjson/istreamwrapper.h>
+#include <sdbus-c++/sdbus-c++.h>
+#include <string>
+#include <utility>
+
+int Notify::run(std::optional<std::string> display) {
+  rapidjson::Document d;
+  rapidjson::IStreamWrapper stream(std::cin);
+  d.ParseStream(stream);
+  if (d.HasParseError()) {
+    std::cerr << "Error parsing input: " << d.GetErrorOffset() << ": "
+              << rapidjson::GetParseError_En(d.GetParseError()) << '\n';
+    return 2;
+  }
+
+  if (d.IsObject() && d.HasMember("session_id") && d["session_id"].IsString() &&
+      d.HasMember("hook_event_name") && d["hook_event_name"].IsString()) {
+    std::string session_id = d["session_id"].GetString();
+    std::string event_name = d["hook_event_name"].GetString();
+    std::optional<std::string> cwd;
+    if (d.HasMember("cwd") && d["cwd"].IsString()) {
+      cwd = d["cwd"].GetString();
+    }
+    std::optional<std::string> notification_type;
+    if (d.HasMember("notification_type") && d["notification_type"].IsString()) {
+      notification_type = d["notification_type"].GetString();
+    }
+
+    std::optional<std::string> desktop =
+        find_desktop(std::move(display), /* use_prefix */ false);
+
+    auto proxy = sdbus::createProxy(dbus::kServiceName, dbus::kObjectPath);
+
+    try {
+      proxy->callMethod("notify")
+          .onInterface(dbus::kInterfaceName)
+          .withArguments(session_id, event_name, cwd.value_or(""),
+                         notification_type.value_or(""), desktop.value_or(""))
+          .dontExpectReply();
+    } catch (sdbus::Error const& err) {
+      std::cerr << "Failed to notify: " << err.what() << '\n';
+      return 2;
+    }
+
+    return 0;
+  }
+
+  std::cerr << "Unexpected input." << '\n';
+  return 2;
+}
diff --git a/src/notify.hh b/src/notify.hh
new file mode 100644
index 0000000..11c16d7
--- /dev/null
+++ b/src/notify.hh
@@ -0,0 +1,12 @@
+#ifndef NOTIFY_HH
+#define NOTIFY_HH
+
+#include <optional>
+#include <string>
+
+class Notify {
+ public:
+  static int run(std::optional<std::string> display);
+};
+
+#endif  // NOTIFY_HH
diff --git a/src/xcb_atoms.cc b/src/xcb_atoms.cc
new file mode 100644
index 0000000..29c131f
--- /dev/null
+++ b/src/xcb_atoms.cc
@@ -0,0 +1,81 @@
+#include "xcb_atoms.hh"
+
+#include "xcb_connection.hh"
+#include "xcb_event.hh"
+
+#include <cassert>
+#include <cstddef>
+#include <map>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+#include <xcb/xproto.h>
+
+namespace xcb {
+
+namespace {
+
+class AtomsImpl : public Atoms {
+ public:
+  explicit AtomsImpl(shared_conn conn)
+      : conn_(std::move(conn)), storage_(std::make_shared<StorageImpl>()) {}
+
+  Reference get(std::string atom) override {
+    auto it = index_.find(atom);
+    size_t index;
+    if (it == index_.end()) {
+      index = cookie_.size();
+      cookie_.push_back(
+          xcb_intern_atom(conn_.get(), 0, atom.size(), atom.c_str()));
+      index_.emplace(std::move(atom), index);
+    } else {
+      index = it->second;
+    }
+    return {storage_, index};
+  }
+
+  bool sync() override {
+    std::vector<xcb_atom_t> atoms;
+    atoms.reserve(cookie_.size());
+    for (auto const& cookie : cookie_) {
+      xcb::reply<xcb_intern_atom_reply_t> reply(
+          xcb_intern_atom_reply(conn_.get(), cookie, nullptr));
+      if (!reply)
+        return false;
+      atoms.push_back(reply->atom);
+    }
+    storage_->set(std::move(atoms));
+    return true;
+  }
+
+ private:
+  class StorageImpl : public Storage {
+   public:
+    [[nodiscard]]
+    xcb_atom_t get(size_t id) const override {
+      assert(id < resolved_.size());
+      return resolved_[id];
+    }
+
+    void set(std::vector<xcb_atom_t> resolved) {
+      resolved_ = std::move(resolved);
+    }
+
+   private:
+    std::vector<xcb_atom_t> resolved_;
+  };
+
+  shared_conn conn_;
+  std::map<std::string, size_t> index_;
+  std::vector<xcb_intern_atom_cookie_t> cookie_;
+  std::shared_ptr<StorageImpl> storage_;
+};
+
+}  // namespace
+
+std::unique_ptr<Atoms> Atoms::create(shared_conn conn) {
+  return std::make_unique<AtomsImpl>(std::move(conn));
+}
+
+}  // namespace xcb
diff --git a/src/xcb_atoms.hh b/src/xcb_atoms.hh
new file mode 100644
index 0000000..f7a375e
--- /dev/null
+++ b/src/xcb_atoms.hh
@@ -0,0 +1,57 @@
+#ifndef XCB_ATOMS_HH
+#define XCB_ATOMS_HH
+
+#include "xcb_connection.hh"
+
+#include <memory>
+#include <string>
+#include <xcb/xproto.h>
+
+namespace xcb {
+
+class Atoms {
+ protected:
+  class Storage;
+
+ public:
+  virtual ~Atoms() = default;
+
+  class Reference {
+   public:
+    xcb_atom_t get() { return atoms_->get(id_); }
+
+    Reference(std::shared_ptr<Storage> atoms, size_t id)
+        : atoms_(atoms), id_(id) {}
+
+   private:
+    std::shared_ptr<Storage> atoms_;
+    size_t id_;
+  };
+
+  [[nodiscard]]
+  virtual Reference get(std::string atom) = 0;
+
+  virtual bool sync() = 0;
+
+  [[nodiscard]]
+  static std::unique_ptr<Atoms> create(shared_conn conn);
+
+ protected:
+  Atoms() = default;
+  Atoms(Atoms const&) = delete;
+  Atoms& operator=(Atoms const&) = delete;
+
+  class Storage {
+   public:
+    virtual ~Storage() = default;
+
+    virtual xcb_atom_t get(size_t id) const = 0;
+
+   protected:
+    Storage() = default;
+  };
+};
+
+}  // namespace xcb
+
+#endif  // XCB_ATOMS_HH
diff --git a/src/xcb_colors.cc b/src/xcb_colors.cc
new file mode 100644
index 0000000..b7ffff3
--- /dev/null
+++ b/src/xcb_colors.cc
@@ -0,0 +1,96 @@
+#include "xcb_colors.hh"
+
+#include "xcb_connection.hh"
+#include "xcb_event.hh"
+
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <map>
+#include <memory>
+#include <utility>
+#include <vector>
+#include <xcb/xproto.h>
+
+namespace xcb {
+
+namespace {
+
+class ColorsImpl : public Colors {
+ public:
+  ColorsImpl(shared_conn conn, xcb_colormap_t colormap)
+      : conn_(std::move(conn)),
+        colormap_(colormap),
+        storage_(std::make_shared<StorageImpl>()) {}
+
+  Color get_with_fallback(uint8_t r, uint8_t g, uint8_t b,
+                          uint32_t fallback) override {
+    auto key = make_key(r, g, b);
+    auto it = index_.find(key);
+    size_t index;
+    if (it == index_.end()) {
+      index = cookie_.size();
+      cookie_.push_back(xcb_alloc_color(
+          conn_.get(), colormap_, static_cast<uint16_t>(r) << 8,
+          static_cast<uint16_t>(g) << 8, static_cast<uint16_t>(b) << 8));
+      fallback_.push_back(fallback);
+      index_.emplace(key, index);
+    } else {
+      index = it->second;
+    }
+    return {storage_, index};
+  }
+
+  bool sync() override {
+    std::vector<uint32_t> colors;
+    colors.reserve(cookie_.size());
+    for (size_t i = 0; i < cookie_.size(); ++i) {
+      xcb::reply<xcb_alloc_color_reply_t> reply(
+          xcb_alloc_color_reply(conn_.get(), cookie_[i], nullptr));
+      if (reply) {
+        colors.push_back(reply->pixel);
+      } else {
+        colors.push_back(fallback_[i]);
+      }
+    }
+    storage_->set(std::move(colors));
+    return true;
+  }
+
+ private:
+  class StorageImpl : public Storage {
+   public:
+    [[nodiscard]]
+    uint32_t get(size_t id) const override {
+      assert(id < resolved_.size());
+      return resolved_[id];
+    }
+
+    void set(std::vector<uint32_t> resolved) {
+      resolved_ = std::move(resolved);
+    }
+
+   private:
+    std::vector<uint32_t> resolved_;
+  };
+
+  static uint32_t make_key(uint8_t r, uint8_t g, uint8_t b) {
+    return static_cast<uint32_t>(r) << 16 | static_cast<uint32_t>(g) << 8 | b;
+  }
+
+  shared_conn conn_;
+  xcb_colormap_t colormap_;
+  std::map<uint32_t, size_t> index_;
+  std::vector<xcb_alloc_color_cookie_t> cookie_;
+  std::vector<uint32_t> fallback_;
+  std::shared_ptr<StorageImpl> storage_;
+};
+
+}  // namespace
+
+std::unique_ptr<Colors> Colors::create(shared_conn conn,
+                                       xcb_colormap_t colormap) {
+  return std::make_unique<ColorsImpl>(std::move(conn), colormap);
+}
+
+}  // namespace xcb
diff --git a/src/xcb_colors.hh b/src/xcb_colors.hh
new file mode 100644
index 0000000..a1bc610
--- /dev/null
+++ b/src/xcb_colors.hh
@@ -0,0 +1,57 @@
+#ifndef XCB_COLORS_HH
+#define XCB_COLORS_HH
+
+#include "xcb_connection.hh"
+
+#include <memory>
+
+namespace xcb {
+
+class Colors {
+ protected:
+  class Storage;
+
+ public:
+  virtual ~Colors() = default;
+
+  class Color {
+   public:
+    uint32_t get() { return colors_->get(id_); }
+
+    Color(std::shared_ptr<Storage> colors, size_t id)
+        : colors_(colors), id_(id) {}
+
+   private:
+    std::shared_ptr<Storage> colors_;
+    size_t id_;
+  };
+
+  [[nodiscard]]
+  virtual Color get_with_fallback(uint8_t r, uint8_t g, uint8_t b,
+                                  uint32_t fallback) = 0;
+
+  virtual bool sync() = 0;
+
+  [[nodiscard]]
+  static std::unique_ptr<Colors> create(shared_conn conn,
+                                        xcb_colormap_t colormap);
+
+ protected:
+  Colors() = default;
+  Colors(Colors const&) = delete;
+  Colors& operator=(Colors const&) = delete;
+
+  class Storage {
+   public:
+    virtual ~Storage() = default;
+
+    virtual uint32_t get(size_t id) const = 0;
+
+   protected:
+    Storage() = default;
+  };
+};
+
+}  // namespace xcb
+
+#endif  // XCB_COLORS_HH
diff --git a/src/xcb_connection.cc b/src/xcb_connection.cc
new file mode 100644
index 0000000..89b4a63
--- /dev/null
+++ b/src/xcb_connection.cc
@@ -0,0 +1,25 @@
+#include "xcb_connection.hh"
+
+#include <xcb/xproto.h>
+
+namespace xcb {
+
+shared_conn make_shared_conn(xcb_connection_t* conn) {
+  return {conn, internal::xcb_connection_deleter()};
+}
+
+unique_conn make_unique_conn(xcb_connection_t* conn) {
+  return unique_conn(conn);
+}
+
+xcb_screen_t* get_screen(xcb_connection_t* conn, int screen_index) {
+  auto iter = xcb_setup_roots_iterator(xcb_get_setup(conn));
+  for (; iter.rem; --screen_index, xcb_screen_next(&iter)) {
+    if (screen_index == 0) {
+      return iter.data;
+    }
+  }
+  return nullptr;
+}
+
+}  // namespace xcb
diff --git a/src/xcb_connection.hh b/src/xcb_connection.hh
new file mode 100644
index 0000000..23801b8
--- /dev/null
+++ b/src/xcb_connection.hh
@@ -0,0 +1,28 @@
+#ifndef XCB_CONNECTION_HH
+#define XCB_CONNECTION_HH
+
+#include <memory>
+#include <xcb/xcb.h>  // IWYU pragma: export
+
+namespace xcb {
+
+namespace internal {
+
+struct xcb_connection_deleter {
+  void operator()(xcb_connection_t* ptr) { xcb_disconnect(ptr); }
+};
+
+}  // namespace internal
+
+typedef std::shared_ptr<xcb_connection_t> shared_conn;
+typedef std::unique_ptr<xcb_connection_t, internal::xcb_connection_deleter>
+    unique_conn;
+
+shared_conn make_shared_conn(xcb_connection_t* conn);
+unique_conn make_unique_conn(xcb_connection_t* conn);
+
+xcb_screen_t* get_screen(xcb_connection_t* conn, int screen_index);
+
+}  // namespace xcb
+
+#endif  // XCB_CONNECTION_HH
diff --git a/src/xcb_event.hh b/src/xcb_event.hh
new file mode 100644
index 0000000..0e0e10b
--- /dev/null
+++ b/src/xcb_event.hh
@@ -0,0 +1,30 @@
+#ifndef XCB_EVENT_HH
+#define XCB_EVENT_HH
+
+#include <memory>
+#include <stdlib.h>
+#include <xcb/xcb.h>
+#include <xcb/xcb_event.h>
+
+namespace xcb {
+
+namespace internal {
+
+struct FreeDeleter {
+  void operator()(void* ptr) { free(ptr); }
+};
+
+}  // namespace internal
+
+typedef std::unique_ptr<xcb_generic_event_t, internal::FreeDeleter>
+    generic_event;
+
+typedef std::unique_ptr<xcb_generic_error_t, internal::FreeDeleter>
+    generic_error;
+
+template <typename T>
+using reply = std::unique_ptr<T, internal::FreeDeleter>;
+
+}  // namespace xcb
+
+#endif  // XCB_EVENT_HH
diff --git a/src/xcb_resource.cc b/src/xcb_resource.cc
new file mode 100644
index 0000000..8005c6f
--- /dev/null
+++ b/src/xcb_resource.cc
@@ -0,0 +1,41 @@
+#include "xcb_resource.hh"
+
+#include "xcb_connection.hh"
+
+#include <memory>
+#include <utility>
+#include <xcb/xproto.h>
+
+namespace xcb {
+
+unique_wnd make_unique_wnd(shared_conn conn) {
+  return std::make_unique<xcb_resource<xcb_window_t, internal::WndDeleter>>(
+      std::move(conn));
+}
+
+shared_wnd make_shared_wnd(shared_conn conn) {
+  return std::make_shared<xcb_resource<xcb_window_t, internal::WndDeleter>>(
+      std::move(conn));
+}
+
+unique_gc make_unique_gc(shared_conn conn) {
+  return std::make_unique<xcb_resource<xcb_gcontext_t, internal::GCDeleter>>(
+      std::move(conn));
+}
+
+shared_gc make_shared_gc(shared_conn conn) {
+  return std::make_shared<xcb_resource<xcb_gcontext_t, internal::GCDeleter>>(
+      std::move(conn));
+}
+
+unique_font make_unique_font(shared_conn conn) {
+  return std::make_unique<xcb_resource<xcb_font_t, internal::FontDeleter>>(
+      std::move(conn));
+}
+
+shared_font make_shared_font(shared_conn conn) {
+  return std::make_shared<xcb_resource<xcb_font_t, internal::FontDeleter>>(
+      std::move(conn));
+}
+
+}  // namespace xcb
diff --git a/src/xcb_resource.hh b/src/xcb_resource.hh
new file mode 100644
index 0000000..b499f2c
--- /dev/null
+++ b/src/xcb_resource.hh
@@ -0,0 +1,99 @@
+#ifndef XCB_RESOURCE_HH
+#define XCB_RESOURCE_HH
+
+#include "xcb_connection.hh"
+
+#include <memory>
+#include <xcb/xproto.h>
+
+namespace xcb {
+
+namespace internal {
+
+struct WndDeleter {
+  void operator()(xcb_connection_t* conn, xcb_window_t wnd) const {
+    xcb_destroy_window(conn, wnd);
+  }
+};
+
+struct GCDeleter {
+  void operator()(xcb_connection_t* conn, xcb_gcontext_t gc) const {
+    xcb_free_gc(conn, gc);
+  }
+};
+
+struct FontDeleter {
+  void operator()(xcb_connection_t* conn, xcb_font_t font) const {
+    xcb_close_font(conn, font);
+  }
+};
+
+}  // namespace internal
+
+template <typename T, typename Deleter>
+class xcb_resource {
+ public:
+  explicit xcb_resource(shared_conn conn)
+      : conn_(conn), id_(xcb_generate_id(conn_.get())) {}
+  constexpr xcb_resource() : id_(XCB_NONE) {}
+  xcb_resource(xcb_resource const& res) = delete;
+  xcb_resource(xcb_resource&& res) : conn_(res.conn_), id_(res.release()) {}
+  ~xcb_resource() { reset(); }
+
+  xcb_resource& operator=(xcb_resource const& res) = delete;
+  xcb_resource& operator=(xcb_resource&& res) {
+    reset();
+    conn_ = res.conn_;
+    id_ = res.release();
+    return *this;
+  }
+
+  T id() const { return id_; }
+
+  void reset() {
+    if (id_ == XCB_NONE)
+      return;
+    deleter_(conn_.get(), id_);
+    id_ = XCB_NONE;
+  }
+
+  T release() {
+    auto ret = id_;
+    id_ = XCB_NONE;
+    conn_.reset();
+    return ret;
+  }
+
+ private:
+  shared_conn conn_;
+  T id_;
+  Deleter const deleter_{};
+};
+
+typedef std::unique_ptr<xcb_resource<xcb_window_t, internal::WndDeleter>>
+    unique_wnd;
+typedef std::shared_ptr<xcb_resource<xcb_window_t, internal::WndDeleter>>
+    shared_wnd;
+
+unique_wnd make_unique_wnd(shared_conn conn);
+shared_wnd make_shared_wnd(shared_conn conn);
+
+typedef std::unique_ptr<xcb_resource<xcb_gcontext_t, internal::GCDeleter>>
+    unique_gc;
+typedef std::shared_ptr<xcb_resource<xcb_gcontext_t, internal::GCDeleter>>
+    shared_gc;
+
+unique_gc make_unique_gc(shared_conn conn);
+shared_gc make_shared_gc(shared_conn conn);
+
+typedef std::unique_ptr<xcb_resource<xcb_font_t, internal::FontDeleter>>
+    unique_font;
+typedef std::shared_ptr<xcb_resource<xcb_font_t, internal::FontDeleter>>
+    shared_font;
+
+unique_font make_unique_font(shared_conn conn);
+shared_font make_shared_font(shared_conn conn);
+
+}  // namespace xcb
+
+#endif  // XCB_RESOURCE_HH
diff --git a/src/xcb_resources.hh b/src/xcb_resources.hh
new file mode 100644
index 0000000..f0482c3
--- /dev/null
+++ b/src/xcb_resources.hh
@@ -0,0 +1,35 @@
+#ifndef XCB_RESOURCES_HH
+#define XCB_RESOURCES_HH
+
+#include "xcb_connection.hh"
+
+#include <memory>
+#include <optional>
+#include <string>
+
+namespace xcb {
+
+class Resources {
+ public:
+  virtual ~Resources() = default;
+
+  virtual std::optional<std::string> get_string(std::string const& name,
+                                                std::string const& clazz) = 0;
+
+  virtual std::optional<long> get_long(std::string const& name,
+                                       std::string const& clazz) = 0;
+
+  virtual std::optional<bool> get_bool(std::string const& name,
+                                       std::string const& clazz) = 0;
+
+  static std::unique_ptr<Resources> create(shared_conn conn);
+
+ protected:
+  Resources() = default;
+  Resources(Resources const&) = delete;
+  Resources& operator=(Resources const&) = delete;
+};
+
+}  // namespace xcb
+
+#endif  // XCB_RESOURCES_HH
diff --git a/src/xcb_resources_none.cc b/src/xcb_resources_none.cc
new file mode 100644
index 0000000..d9fa783
--- /dev/null
+++ b/src/xcb_resources_none.cc
@@ -0,0 +1,37 @@
+#include "xcb_resources.hh"
+
+#include <memory>
+#include <optional>
+#include <string>
+
+namespace xcb {
+
+namespace {
+
+class ResourcesNone : public Resources {
+ public:
+  ResourcesNone() = default;
+
+  std::optional<std::string> get_string(std::string const&,
+                                        std::string const&) override {
+    return std::nullopt;
+  }
+
+  std::optional<long> get_long(std::string const&,
+                               std::string const&) override {
+    return std::nullopt;
+  }
+
+  std::optional<bool> get_bool(std::string const&,
+                               std::string const&) override {
+    return std::nullopt;
+  }
+};
+
+}  // namespace
+
+std::unique_ptr<Resources> Resources::create(shared_conn) {
+  return std::make_unique<ResourcesNone>();
+}
+
+}  // namespace xcb
diff --git a/src/xcb_resources_xrm.cc b/src/xcb_resources_xrm.cc
new file mode 100644
index 0000000..1574fdc
--- /dev/null
+++ b/src/xcb_resources_xrm.cc
@@ -0,0 +1,74 @@
+#include "xcb_connection.hh"
+#include "xcb_resources.hh"
+
+#include <cstdlib>
+#include <memory>
+#include <optional>
+#include <string>
+#include <utility>
+#include <xcb/xcb_xrm.h>
+
+namespace xcb {
+
+namespace {
+
+struct DatabaseDeleter {
+  void operator()(xcb_xrm_database_t* db) { xcb_xrm_database_free(db); }
+};
+
+class ResourcesXrm : public Resources {
+ public:
+  explicit ResourcesXrm(shared_conn conn)
+      : conn_(std::move(conn)),
+        db_(xcb_xrm_database_from_default(conn_.get())) {}
+
+  std::optional<std::string> get_string(std::string const& name,
+                                        std::string const& clazz) override {
+    if (db_) {
+      char* tmp;
+      if (xcb_xrm_resource_get_string(db_.get(), std::string(name).c_str(),
+                                      std::string(clazz).c_str(), &tmp) >= 0) {
+        std::string ret(tmp);
+        free(tmp);
+        return ret;
+      }
+    }
+    return std::nullopt;
+  }
+
+  std::optional<long> get_long(std::string const& name,
+                               std::string const& clazz) override {
+    if (db_) {
+      long tmp;
+      if (xcb_xrm_resource_get_long(db_.get(), std::string(name).c_str(),
+                                    std::string(clazz).c_str(), &tmp) >= 0) {
+        return tmp;
+      }
+    }
+    return std::nullopt;
+  }
+
+  std::optional<bool> get_bool(std::string const& name,
+                               std::string const& clazz) override {
+    if (db_) {
+      bool tmp;
+      if (xcb_xrm_resource_get_bool(db_.get(), std::string(name).c_str(),
+                                    std::string(clazz).c_str(), &tmp) >= 0) {
+        return tmp;
+      }
+    }
+    return std::nullopt;
+  }
+
+ private:
+  shared_conn conn_;
+  std::unique_ptr<xcb_xrm_database_t, DatabaseDeleter> db_;
+};
+
+}  // namespace
+
+std::unique_ptr<Resources> Resources::create(shared_conn conn) {
+  return std::make_unique<ResourcesXrm>(std::move(conn));
+}
+
+}  // namespace xcb
diff --git a/src/xcb_xkb.cc b/src/xcb_xkb.cc
new file mode 100644
index 0000000..3d00537
--- /dev/null
+++ b/src/xcb_xkb.cc
@@ -0,0 +1,167 @@
+#include "xcb_xkb.hh"
+
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <xcb/xcb.h>
+#include <xcb/xcb_event.h>
+#define explicit dont_use_cxx_explicit
+#include <xcb/xkb.h>
+#undef explicit
+#include <utility>
+#include <xcb/xproto.h>
+#include <xkbcommon/xkbcommon-x11.h>
+#include <xkbcommon/xkbcommon.h>
+
+namespace xcb {
+
+namespace {
+
+struct KeymapDeleter {
+  void operator()(xkb_keymap* keymap) const {
+    if (keymap)
+      xkb_keymap_unref(keymap);
+  }
+};
+
+struct StateDeleter {
+  void operator()(xkb_state* state) const {
+    if (state)
+      xkb_state_unref(state);
+  }
+};
+
+struct ContextDeleter {
+  void operator()(xkb_context* context) const {
+    if (context)
+      xkb_context_unref(context);
+  }
+};
+
+class KeyboardImpl : public Keyboard {
+ public:
+  KeyboardImpl() = default;
+
+  bool init(xcb_connection_t* conn) {
+    if (!xkb_x11_setup_xkb_extension(
+            conn, XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION,
+            XKB_X11_SETUP_XKB_EXTENSION_NO_FLAGS, nullptr, nullptr,
+            &first_xkb_event_, nullptr))
+      return false;
+
+    ctx_.reset(xkb_context_new(XKB_CONTEXT_NO_FLAGS));
+    if (!ctx_)
+      return false;
+    device_id_ = xkb_x11_get_core_keyboard_device_id(conn);
+    if (device_id_ == -1)
+      return false;
+    if (!update_keymap(conn))
+      return false;
+    select_events(conn);
+    return true;
+  }
+
+  bool handle_event(xcb_connection_t* conn,
+                    xcb_generic_event_t* event) override {
+    if (XCB_EVENT_RESPONSE_TYPE(event) == first_xkb_event_) {
+      auto* xkb_event = reinterpret_cast<xkb_generic_event_t*>(event);
+      if (std::cmp_equal(xkb_event->deviceID, device_id_)) {
+        switch (xkb_event->xkbType) {
+          case XCB_XKB_NEW_KEYBOARD_NOTIFY: {
+            auto* e =
+                reinterpret_cast<xcb_xkb_new_keyboard_notify_event_t*>(event);
+            if (e->changed & XCB_XKB_NKN_DETAIL_KEYCODES)
+              update_keymap(conn);
+            break;
+          }
+          case XCB_XKB_MAP_NOTIFY:
+            update_keymap(conn);
+            break;
+          case XCB_XKB_STATE_NOTIFY: {
+            auto* e = reinterpret_cast<xcb_xkb_state_notify_event_t*>(event);
+            xkb_state_update_mask(state_.get(), e->baseMods, e->latchedMods,
+                                  e->lockedMods, e->baseGroup, e->latchedGroup,
+                                  e->lockedGroup);
+            break;
+          }
+          default:
+            break;
+        }
+      }
+      return true;
+    }
+    return false;
+  }
+
+  std::string get_utf8(xcb_key_press_event_t* event) override {
+    char tmp[16];
+    xkb_state_key_get_utf8(state_.get(), event->detail, tmp, sizeof(tmp));
+    return {tmp};
+  }
+
+ private:
+  struct xkb_generic_event_t {
+    uint8_t response_type;
+    uint8_t xkbType;
+    uint16_t sequence;
+    xcb_timestamp_t time;
+    uint8_t deviceID;
+  };
+
+  bool update_keymap(xcb_connection_t* conn) {
+    auto* keymap = xkb_x11_keymap_new_from_device(ctx_.get(), conn, device_id_,
+                                                  XKB_KEYMAP_COMPILE_NO_FLAGS);
+    if (!keymap)
+      return false;
+    auto* state = xkb_x11_state_new_from_device(keymap, conn, device_id_);
+    if (!state) {
+      xkb_keymap_unref(keymap);
+      return false;
+    }
+    keymap_.reset(keymap);
+    state_.reset(state);
+    return true;
+  }
+
+  void select_events(xcb_connection_t* conn) const {
+    static const uint16_t new_keyboard_details = XCB_XKB_NKN_DETAIL_KEYCODES;
+    static const uint16_t map_parts =
+        XCB_XKB_MAP_PART_KEY_TYPES | XCB_XKB_MAP_PART_KEY_SYMS |
+        XCB_XKB_MAP_PART_MODIFIER_MAP | XCB_XKB_MAP_PART_EXPLICIT_COMPONENTS |
+        XCB_XKB_MAP_PART_KEY_ACTIONS | XCB_XKB_MAP_PART_VIRTUAL_MODS |
+        XCB_XKB_MAP_PART_VIRTUAL_MOD_MAP;
+    static const uint16_t state_details =
+        XCB_XKB_STATE_PART_MODIFIER_BASE | XCB_XKB_STATE_PART_MODIFIER_LATCH |
+        XCB_XKB_STATE_PART_MODIFIER_LOCK | XCB_XKB_STATE_PART_GROUP_BASE |
+        XCB_XKB_STATE_PART_GROUP_LATCH | XCB_XKB_STATE_PART_GROUP_LOCK;
+
+    xcb_xkb_select_events_details_t details = {};
+    details.affectNewKeyboard = new_keyboard_details;
+    details.newKeyboardDetails = new_keyboard_details;
+    details.affectState = state_details;
+    details.stateDetails = state_details;
+
+    xcb_xkb_select_events_aux(conn, device_id_,
+                              XCB_XKB_EVENT_TYPE_NEW_KEYBOARD_NOTIFY |
+                                  XCB_XKB_EVENT_TYPE_MAP_NOTIFY |
+                                  XCB_XKB_EVENT_TYPE_STATE_NOTIFY,
+                              0, 0, map_parts, map_parts, &details);
+  }
+
+  std::unique_ptr<xkb_context, ContextDeleter> ctx_;
+  std::unique_ptr<xkb_keymap, KeymapDeleter> keymap_;
+  std::unique_ptr<xkb_state, StateDeleter> state_;
+  uint8_t first_xkb_event_;
+  int32_t device_id_;
+};
+
+}  // namespace
+
+std::unique_ptr<Keyboard> Keyboard::create(xcb_connection_t* conn) {
+  auto ret = std::make_unique<KeyboardImpl>();
+  if (ret->init(conn))
+    return ret;
+  return nullptr;
+}
+
+}  // namespace xcb
diff --git a/src/xcb_xkb.hh b/src/xcb_xkb.hh
new file mode 100644
index 0000000..b05ce3b
--- /dev/null
+++ b/src/xcb_xkb.hh
@@ -0,0 +1,30 @@
+#ifndef XCB_XKB_HH
+#define XCB_XKB_HH
+
+#include <memory>
+#include <string>
+#include <xcb/xcb.h>
+#include <xcb/xproto.h>
+
+namespace xcb {
+
+class Keyboard {
+ public:
+  virtual ~Keyboard() = default;
+
+  virtual bool handle_event(xcb_connection_t* conn,
+                            xcb_generic_event_t* event) = 0;
+
+  virtual std::string get_utf8(xcb_key_press_event_t* event) = 0;
+
+  static std::unique_ptr<Keyboard> create(xcb_connection_t* conn);
+
+ protected:
+  Keyboard() = default;
+  Keyboard(Keyboard const&) = delete;
+  Keyboard& operator=(Keyboard const&) = delete;
+};
+
+}  // namespace xcb
+
+#endif  // XCB_XKB_HH
-- 
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