How to autocomplete a bash commandline with file paths?

Question

Context

I am creating a shell program which is a command line tool. I want to create my own auto-completion for this tool.

I want to do two different thing

Answer 1

To auto complete file paths

Substitute

complete -F __my_app_autocomplete my_app

with

complete -o filenames -F __my_app_autocomplete my_app

Here you can find all the compgen options explained:

https://www.gnu.org/software/bash/manual/html_node/Programmable-Completion-Builtins.html