subcommand_metavar is not reflected in the help message

[VoVAllen]

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I searched the Typer documentation, with the integrated search.
• I already searched in Google "How to X in Typer" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to Typer but to Click.

Commit to Help

• I commit to help with one of those options 👆

Example Code

import typer
config_app = typer.Typer(subcommand_metavar="PIPELINE_NAME")

@config_app.command()
def test():
    pass


@config_app.command()
def train():
    pass

config_app()

Description

The first line used metavar specified in the code, but the lower part still use Commands as the section name.

Usage: tmp.py [OPTIONS] PIPELINE_NAME

Options:
  --install-completion  Install completion for the current shell.
  --show-completion     Show completion for the current shell, to copy it or
                        customize the installation.

  --help                Show this message and exit.

Commands:
  test
  train

Operating System

Linux

Operating System Details

No response

Typer Version

0.4.0

Python Version

3.8.8

Additional Context

No response

[YuriiMotov]

The same with pure Click app:

See in the details

import click

@click.group(subcommand_metavar="ACTION")
def cli():
    pass

@cli.command()
def start():
    click.echo("Starting...")

@cli.command()
def stop():
    click.echo("Stopping...")

if __name__ == "__main__":
    cli()

$ python main.py --help
Usage: main.py [OPTIONS] ACTION

Options:
  --help  Show this message and exit.

Commands:
  start
  stop

And, I'm not sure it would be correct to use the same value for the title of "Commands" section as is. By default it's plural form.

I think there should be separate parameter to specify this.
I would start from asking how it's supposed to be done with Click.