Merge pull request #2573 from CromFr/cabi_plugins

C ABI plugin system

include/AModule.hpp

@@ -17,6 +17,7 @@ class AModule : public IModule {
   operator Gtk::Widget &() override;
   auto doAction(const std::string &name) -> void override;
 
+  /// Emitting on this dispatcher triggers a update() call
   Glib::Dispatcher dp;
 
  protected:

include/factory.hpp

@@ -94,6 +94,7 @@
 #include "modules/cava.hpp"
 #endif
 #include "bar.hpp"
+#include "modules/cffi.hpp"
 #include "modules/custom.hpp"
 #include "modules/image.hpp"
 #include "modules/temperature.hpp"

include/modules/cffi.hpp

@@ -0,0 +1,60 @@
+#pragma once
+
+#include <string>
+
+#include "AModule.hpp"
+#include "util/command.hpp"
+#include "util/json.hpp"
+#include "util/sleeper_thread.hpp"
+
+namespace waybar::modules {
+
+namespace ffi {
+extern "C" {
+typedef struct wbcffi_module wbcffi_module;
+
+typedef struct {
+  wbcffi_module* obj;
+  const char* waybar_version;
+  GtkContainer* (*get_root_widget)(wbcffi_module*);
+  void (*queue_update)(wbcffi_module*);
+} wbcffi_init_info;
+
+struct wbcffi_config_entry {
+  const char* key;
+  const char* value;
+};
+}
+}  // namespace ffi
+
+class CFFI : public AModule {
+ public:
+  CFFI(const std::string&, const std::string&, const Json::Value&);
+  virtual ~CFFI();
+
+  virtual auto refresh(int signal) -> void override;
+  virtual auto doAction(const std::string& name) -> void override;
+  virtual auto update() -> void override;
+
+ private:
+  ///
+  void* cffi_instance_ = nullptr;
+
+  typedef void*(InitFn)(const ffi::wbcffi_init_info* init_info,
+                        const ffi::wbcffi_config_entry* config_entries, size_t config_entries_len);
+  typedef void(DenitFn)(void* instance);
+  typedef void(RefreshFn)(void* instance, int signal);
+  typedef void(DoActionFn)(void* instance, const char* name);
+  typedef void(UpdateFn)(void* instance);
+
+  // FFI hooks
+  struct {
+    std::function<InitFn> init = nullptr;
+    std::function<DenitFn> deinit = nullptr;
+    std::function<RefreshFn> refresh = [](void*, int) {};
+    std::function<DoActionFn> doAction = [](void*, const char*) {};
+    std::function<UpdateFn> update = [](void*) {};
+  } hooks_;
+};
+
+}  // namespace waybar::modules