How to map Ctrl+A and Ctrl+Shift+A differently?

Question

In a terminal, one cannot distinguish Ctrl+A and Ctrl+Shift+A as they both emit the same key code, so I can see why Vi

Answer 1

As you've noted, you get the same keycode. So the only way to distinguish them is to check the state of the Shift key in your event handling function. Of course, if you have more than 0.5 second delay between keypress and processing, you'll miss some hits.