Command and prompt style can be modified

examples/simple.php

@@ -43,6 +43,8 @@ class MyShell extends Shell
             $lt = $t + 5;
             echo date("Y-m-d h:i:s")."\n";
         }
+        $fg = ($this->seq % 7) + 1;
+        $this->setPromptStyle("3{$fg}");
     }
     
     protected function onCommand($buffer)