show envvar in error hint

[KotlinIsland]

@click.command()
@click.option('--a', required=True, envvar="b", show_envvar=True)
def f(a): ...
f()

Here I would want the error message to show the env var.

[davidism]

Out of curiosity, why does this and the PR start with an emoji in parentheses? That's pretty distracting, it's not clear how it's related to the request, and it's not something any other issues/PRs in the Pallets org use.

[KotlinIsland]

Because I like it. It got me banned from pre-commit (and all asottile projects) though 🤣

[davidism]

Please don't use it unless a project indicates it's how things are done. Otherwise it's just noisy and annoying, exactly what was said in that issue.