Currently fish shell (2.3.1) shows the completion list after pressing Tab. You can navigate through the list using the arrow keys or Tab.

asciicast

If possible, how can I show the completion list in a pop menu and without pressing Tab, so that as soon as I start typing it starts showing the completion menu?

Here is a demo of what I am looking for:

enter image description here

up vote 2 down vote accepted

Fish currently has no such capability. Feel free to open an enhancement request since that would be a very cool addition. Even better would be to create a pull-request since the core dev team is just a handful of people :-)

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