wip(xworkspaces): EWMH desktops

Ref #84

include/modules/xworkspaces.hpp

@@ -0,0 +1,68 @@
+#pragma once
+
+#include <bitset>
+
+#include "components/config.hpp"
+#include "modules/meta/static_module.hpp"
+#include "x11/events.hpp"
+#include "x11/ewmh.hpp"
+#include "x11/icccm.hpp"
+#include "x11/window.hpp"
+
+POLYBAR_NS
+
+class connection;
+
+namespace modules {
+  enum class desktop_state {
+    NONE,
+    ACTIVE,
+    URGENT,
+    EMPTY,
+    OCCUPIED,
+  };
+
+  struct desktop {
+    explicit desktop(string&& name, desktop_state state) : name(name), state(state) {}
+    string name;
+    desktop_state state{desktop_state::NONE};
+    label_t label;
+  };
+
+  /**
+   * Module used to display EWMH desktops
+   */
+  class xworkspaces_module : public static_module<xworkspaces_module>, public xpp::event::sink<evt::property_notify> {
+   public:
+    xworkspaces_module(const bar_settings& bar, const logger& logger, const config& config, string name);
+
+    void setup();
+    void teardown();
+    void handle(const evt::property_notify& evt);
+    void update();
+    string get_output();
+    bool build(builder* builder, const string& tag) const;
+
+   protected:
+    void rebuild_desktops();
+    void set_current_desktop();
+
+   private:
+    static constexpr const char* DEFAULT_ICON{"icon-default"};
+    static constexpr const char* DEFAULT_LABEL{"%icon% %name%"};
+
+    static constexpr const char* TAG_LABEL{"<label>"};
+
+    connection& m_connection;
+    ewmh_connection_t m_ewmh;
+    event_timer m_throttle{0, 0};
+
+    vector<unique_ptr<desktop>> m_desktops;
+    map<desktop_state, label_t> m_labels;
+    iconset_t m_icons;
+
+    size_t m_index{0};
+  };
+}
+
+POLYBAR_NS_END