Show all help for a whole Click command tree

cli.py

import copy
import os

import click


@click.group()
def cli():
    """A grouping of commands"""
    pass


@cli.command()
@click.option(
    '-n', '--real-cli-name',
    type=str,
    default=None,
    help="If desired, set this to replace the current filename with the correct wrapper filename",
)
@click.pass_context
def list_tree(ctx, real_cli_name):
    """Lists all (sub)commands and their help for updating a README more easily"""

    def walk_command_tree(obj, parents=None):
        if isinstance(obj, click.Group):
            new_parents = [] if parents is None else copy.copy(parents)
            for name, value in obj.commands.items():
                walk_command_tree(value, parents=[*new_parents, name])

        if isinstance(obj, click.Command):
            help = obj.get_help(ctx)

            if real_cli_name:
                help = help.replace(os.path.basename(__file__), real_cli_name)

            # Since we're using the current context when getting the help, the command line returned is
            # wrong. The following fixes that.
            if parents:
                help = help.replace(' list-tree ', ' '+' '.join(parents)+' ', 1)
            else:
                help = help.replace(' list-tree ', ' ', 1)
            click.echo(help)
            click.echo('')

    walk_command_tree(cli)


if __name__ == '__main__':
    # Add subcommands to the cli here:
    # cli.add_command(my_other_cmd_group)
    
    cli()