implement a few commands

myirc/include/myirc/bot.hpp

@@ -18,6 +18,15 @@ struct Bot : std::enable_shared_from_this<Bot>
         std::string_view account;
         std::string_view command;
         std::string_view arguments;
+
+        auto nick() const -> std::string_view {
+            auto bang = source.find('!');
+            if (bang == std::string::npos) {
+                return "";
+            } else {
+                return source.substr(0, bang);
+            }
+        }
     };
 
     std::shared_ptr<Client> self_;