move shell to separate thread

src/ServerShell.hh

@@ -6,27 +6,28 @@
 #include <event2/event.h>
 
 #include "ProxyServer.hh"
-#include "Shell.hh"
+#include "ServerState.hh"
 
-#define SHELL_PROMPT "newserv> "
-
-class ServerShell : public Shell {
+class ServerShell : public std::enable_shared_from_this<ServerShell> {
 public:
-  ServerShell(
-      std::shared_ptr<struct event_base> base,
-      std::shared_ptr<ServerState> state);
-  virtual ~ServerShell() = default;
+  class exit_shell : public std::runtime_error {
+  public:
+    exit_shell();
+    ~exit_shell() = default;
+  };
+
+  explicit ServerShell(std::shared_ptr<ServerState> state);
   ServerShell(const ServerShell&) = delete;
   ServerShell(ServerShell&&) = delete;
   ServerShell& operator=(const ServerShell&) = delete;
   ServerShell& operator=(ServerShell&&) = delete;
+  ~ServerShell();
+
+  std::shared_ptr<ProxyServer::LinkedSession> get_proxy_session(const std::string& name);
 
 protected:
   std::shared_ptr<ServerState> state;
+  std::thread th;
 
-  std::shared_ptr<ProxyServer::LinkedSession> get_proxy_session(
-      const std::string& name);
-
-  virtual void print_prompt();
-  virtual void execute_command(const std::string& command);
+  void thread_fn();
 };