Run click commands from a given string

cli.py

import click
import shlex
from click.testing import CliRunner

help_text = ""


@click.group(invoke_without_command=True)
@click.pass_context
def cli(context):
    """Useful for showing help, since this is the default command"""
    global help_text  # Store it in a global variable for the "help" command
    help_text = context.get_help()
    if context.invoked_subcommand is None:
        print(help_text)


@cli.command()
def help():
    print(help_text)


@cli.command()
@click.argument("name", default="User")
def hello(name):
    print(f"Hello, {name}!")


@cli.command()
@click.argument("name", default="User")
@click.argument("count", default=1)
def thanks(name, count):
    for _ in range(count):
        print(f"You're very welcome, {name}!")


def run_line(line):
    """Do all the magic to run commands from text and print output."""
    runner = CliRunner()
    print(f"INPUT: {line}\nOUTPUT:")
    # Split with shlex to allow "quoted values"
    args = shlex.split(line) if line != "" else [""]
    # Get the function from globals, default to no subcommand
    command = globals().get(args.pop(0), cli)
    result = runner.invoke(command, args)
    if result.exit_code == 0:
        # This is ugly but w/e
        print("> " + result.output.strip().replace("\n", "\n> "), end="")
    print("\n")


@cli.command()
@click.argument("filename", type=click.File("r"))
def test(filename):
    for line in filename.readlines():
        run_line(line.strip())


if __name__ == "__main__":
    cli()

input.txt

hello
hello George
thanks
thanks George
thanks "Dr George PhD" 3

The output for python3 cli.py test input.txt:

INPUT: 
OUTPUT:
> Usage: cli [OPTIONS] COMMAND [ARGS]...
> 
>   Useful for showing help, since this is the default command
> 
> Options:
>   --help  Show this message and exit.
> 
> Commands:
>   hello
>   help
>   test    Run a bunch of commands stored in a text file
>   thanks

INPUT: hello
OUTPUT:
> Hello, User!

INPUT: hello George
OUTPUT:
> Hello, George!

INPUT: thanks
OUTPUT:
> You're very welcome, User!

INPUT: thanks George
OUTPUT:
> You're very welcome, George!

INPUT: thanks "Dr George PhD" 3
OUTPUT:
> You're very welcome, Dr George PhD!
> You're very welcome, Dr George PhD!
> You're very welcome, Dr George PhD!