create_env.sh

#!/bin/bash
mkdir click_cmd_as_fn
cd click_cmd_as_fn
pipenv install click
touch my_click_cmd.py module_calling_the_click_cmd.py
chmod 755 my_click_cmd.py module_calling_the_click_cmd.py

module_calling_the_click_cmd.py

#!/usr/bin/env python3
import click
from my_click_cmd import do_the_thing

@click.command()
@click.option("--alpha", default="Alfred")
@click.option("--bravo", default="Bob")
@click.pass_context
def call_do_the_thing(ctx, alpha, bravo):
    ctx.forward(do_the_thing)
    click.echo("-------------------")
    ctx.invoke(do_the_thing, alpha="Aubergine", bravo="Baby")

if __name__ == '__main__':
    call_do_the_thing()

my_click_cmd.py

#!/usr/bin/env python3
import click

@click.command()
@click.option("--alpha", default="apple")
@click.option("--bravo", default="banana")
def do_the_thing(alpha, bravo):
    click.echo(f"alpha was: {alpha}")
    click.echo(f"bravo was: {bravo}")

if __name__ == '__main__':
    do_the_thing()

run_the_calling_module.sh

pipenv run ./module_calling_the_click_cmd.py