import click


def confirm_operation(prompt, prefix=None, assume_yes=False, err=False):
    """Prompt the user for confirmation for dangerous actions."""
    if assume_yes:
        return True

    prefix = prefix or click.style(
        "Are you %s certain you want to" % (click.style("absolutely", bold=True))
    )

    prompt = "%(prefix)s %(prompt)s?" % {"prefix": prefix, "prompt": prompt}

    if click.confirm(prompt, err=err):
        return True

    click.echo(err=err)
    click.secho("OK, phew! Close call. :-)", fg="green", err=err)
    return False