List files without stopping to type in zsh

This zsh widget allows you to list files in the current directory without interrupting the command you are typing. Usage

Hit <tab> in the middle of any command. It will list all files below the command line.
Hit <space><tab> on an empty command line. It will list directories.
Hit <space><space><tab> on an empty command line. It will list executables.

Regular completion is unaffected.

See more details at

https://ownyourbits.com/2017/01/30/list-files-without-stopping-to-type-in-zsh/