add clear screen command

src/simplewallet/simplewallet.cpp

@@ -3162,7 +3162,7 @@ bool simple_wallet::help(const std::vector<std::string> &args/* = std::vector<st
     message_writer() << tr("\"status\" - Check current status of wallet.");
     message_writer() << tr("\"version\" - Check software version.");
     message_writer() << tr("\"exit\" - Exit wallet.");
-    message_writer() << "";
+    message_writer() << tr("\"clear\" - Clear screen.");
     message_writer() << tr("\"donate <amount>\" - Donate WOW to the development team.");
     message_writer() << "";
   }
@@ -3283,6 +3283,9 @@ simple_wallet::simple_wallet()
   m_cmd_binder.set_handler("refresh",
                            boost::bind(&simple_wallet::on_command, this, &simple_wallet::refresh, _1),
                            tr("Synchronize the transactions and balance."));
+  m_cmd_binder.set_handler("clear",
+                           boost::bind(&simple_wallet::on_command, this, &simple_wallet::clear, _1),
+                           tr("Clear screen."));
   m_cmd_binder.set_handler("balance",
                            boost::bind(&simple_wallet::on_command, this, &simple_wallet::show_balance, _1),
                            tr(USAGE_SHOW_BALANCE),
@@ -6001,6 +6004,16 @@ bool simple_wallet::refresh(const std::vector<std::string>& args)
   return refresh_main(start_height, ResetNone);
 }
 //----------------------------------------------------------------------------------------------------
+bool simple_wallet::clear(const std::vector<std::string>& args)
+{
+#ifdef HAVE_READLINE
+  PAUSE_READLINE();
+    rdln::clear_screen();
+#endif
+  tools::clear_screen();
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
 bool simple_wallet::show_balance_unlocked(bool detailed)
 {
   std::string extra;

src/simplewallet/simplewallet.h

@@ -166,6 +166,7 @@ namespace cryptonote
     bool set_daemon(const std::vector<std::string> &args);
     bool save_bc(const std::vector<std::string> &args);
     bool refresh(const std::vector<std::string> &args);
+    bool clear(const std::vector<std::string> &args);
     bool show_balance_unlocked(bool detailed = false);
     bool show_balance(const std::vector<std::string> &args = std::vector<std::string>());
     bool show_incoming_transfers(const std::vector<std::string> &args);