use parameters only as flags

[jhesqqq]

How can I use parameters just as flags without having to parse the values behind them?

These are my code snippets.
arg only flag

Arg::new("status-code")
            // .short('s')
            .long("sc")
            .help("probe status code")
            .num_args(0..=1),
        Arg::new("content-length")
            // .short('c')
            .long("cl")
            .help("probe content length")
            .num_args(0..=1),
        Arg::new("ip")
            // .short('i')
            .long("ip")
            .help("probe ip address")
            .num_args(0..=1)

Used to determine whether the flag is used

fn format_response(arg:&ArgMatches,response:&reqwest::Response)->String{
    let mut result=format!("{} ",response.url().to_string().cyan());
    if arg.contains_id("status-code"){
        result.push_str(&format!("[{}] ",response.status().to_string().green()));
    }
    if arg.contains_id("content-length"){
        println!("content-length");
        result.push_str(&format!("[{}] ",response.content_length().expect("get content-length fail").to_string().bright_blue()));
    }
    if arg.contains_id("ip") {
        result.push_str(&format!("[{}] ", response.remote_addr().expect("get ip fail").to_string().magenta()));
    }
    if result.len()==0 {
        result.push_str(&format!("[{}] ",response.status().to_string().green()));
    }
    result
}

Here's how the diagram can be improved to work.

Besides, I'd like to know. <status-code> A surname <> How to remove it in builder

[epage]

I feel I am missing something with this request. It sounds like you are asking for how to implement flags but the code you are showing is using more advanced techniques, like having an option that can take either no value or exactly one value (num_args(0..=1)). So I worry there is something I'm missing in what you are trying to accomplish.

[jhesqqq]

Thank you very much!
I've understood.
Earlier I changed to num_args(0) and got an error, now I changed back, and check the documentation to add multiple(true) to the argGroup.
The desired function is successfully implemented.

[jhesqqq]

When I use num_args(0), <status-code> is simply removed.
For consistency, I should have removed the <match-status-code> from the image using the above method.