diff -r 0e947b487b18 -r 4f7c2c944637 sources/interface.cpp
--- a/sources/interface.cpp	Mon May 04 18:16:05 2015 +0300
+++ b/sources/interface.cpp	Fri May 15 18:36:22 2015 +0300
@@ -803,6 +803,20 @@
 		}
 		break;
 
+	case '\t':
+		{
+			int space = current_input().find (" ");
+
+			if (CurrentInputState == INPUTSTATE_NORMAL
+				and InputCursor > 0
+				and (space == -1 or space >= InputCursor))
+			{
+				String start = current_input().mid (0, InputCursor);
+				RCONSession::get_session()->request_tab_complete (start);
+			}
+		}
+		break;
+
 	case '\n':
 	case KEY_ENTER:
 		switch (CurrentInputState)
@@ -892,6 +906,8 @@
 		}
 		break;
 	}
+
+	render();
 }
 
 // -------------------------------------------------------------------------------------------------
@@ -978,3 +994,21 @@
 	PlayerNames = names;
 	NeedNicklistRender = true;
 }
+
+// -------------------------------------------------------------------------------------------------
+//
+FUNCTION
+Interface::tab_complete (const String& part, String complete) -> void
+{
+	String& input = mutable_current_input();
+
+	if (input.starts_with (part))
+	{
+		if (input[part.length()] != ' ')
+			complete += ' ';
+
+		input.replace (0, part.length(), complete);
+		InputCursor = complete.length();
+		NeedInputRender = true;
+	}
+}