Hi,
Click's documentation provides a clear example of how to get default values
from an environment variable, but I am not sure how this works with
configuration files.
Can someone show a sample that would be the semantic equivalent of this?
```
@click.command()
@click.config_override(PATH_TO_CONFIG)
@click.option('--first', default=click.config_override)
@click.option('--second', default=click.config_override)
def main(first, second):
pass
```
The idea is that if I run my program and give it a path to a config file,
then values for `first` and `second` will be taken from the file (if they
are defined there).
Help will be greatly appreciated,
thanks!
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