Prompting for Data

When creating a submission, you'll almost always want to ask the student for some information. Usually their name and ID, but maybe some other information as well.

The prompt! macro does this easily.

fn main() {
    // Asks for something, enforces the correct type
    let name = prompt!("Name: ", String);
    // Will crash if they enter anything but a number
    let age = prompt!("Age: ", usize);
    // Will crash if they don't enter a valid IPv4 address
    let ip = prompt!("IP Addr: ", std::net::IPv4Addr);
}

You can combine this with the data! macro to easily collect information from the user and encapsulate it in a submission.

fn main() {
    let data = data! {
        "name" => prompt!("Name: ", String),
        "id"   => prompt!("ID: ", String)
    }
}

Note: because TestData must contain string values, you lose out on the type enforcement that prompt! provides. This is an unfortunate side effect of the TestData type; all values must be strings.

There is also a prompt function under helpers::cli::prompt which will loop until it gets a valid value, but it does not have the same type enforcement feature that prompt! has; it only returns strings.