Function reason

atomic-cli/src/agent_error.rs:536–561

(err: &clap::Error)

}

fn reason(err: &clap::Error) -> Option<String> {
    if let Some(source) = err.source() {
        return Some(source.to_string());
    }

    match err.kind() {
        ErrorKind::InvalidValue
            if ctx_str(err, ContextKind::InvalidValue).as_deref() == Some("") =>
        {
            Some("a value is required".to_string())
        }
        ErrorKind::NoEquals => Some("an equal sign is required".to_string()),
        ErrorKind::InvalidUtf8 => Some("argument is not valid UTF-8".to_string()),
        ErrorKind::TooFewValues => {
            let minimum = ctx_number(err, ContextKind::MinValues)?;
            let actual = ctx_number(err, ContextKind::ActualNumValues)?;
            Some(format!("expected at least {minimum} values, got {actual}"))
        }
        ErrorKind::WrongNumberOfValues => {
            let expected = ctx_number(err, ContextKind::ExpectedNumValues)?;
            let actual = ctx_number(err, ContextKind::ActualNumValues)?;
            Some(format!("expected {expected} values, got {actual}"))
        }
        _ => None,
    }
}

/// Visible subcommand names of a node, in declaration order.
///