feat(ipc): New ipc module

Add a new module that allow users to configure hooks
on received ipc messages. The hook will execute the defined
shell script and the output of the script will be used
as the module content.

Ref #84

include/modules/ipc.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include "modules/meta.hpp"
+#include "utils/command.hpp"
+
+LEMONBUDDY_NS
+
+struct ipc_hook;  // fwd
+
+namespace modules {
+  /**
+   * Hook structure that will be fired
+   * when receiving a message with specified id
+   */
+  struct hook {
+    string payload;
+    string command;
+  };
+
+  /**
+   * Module that allow users to configure hooks on
+   * received ipc messages. The hook will execute the defined
+   * shell script and the resulting output will be used
+   * as the module content.
+   */
+  class ipc_module : public static_module<ipc_module> {
+   public:
+    using static_module::static_module;
+
+    void setup();
+    string get_output();
+    bool build(builder* builder, string tag) const;
+    void on_message(const ipc_hook& msg);
+
+   private:
+    static constexpr auto TAG_OUTPUT = "<output>";
+    vector<unique_ptr<hook>> m_hooks;
+    string m_output;
+
+    map<mousebtn, string> m_actions;
+  };
+}
+
+LEMONBUDDY_NS_END