How to Get Matches From a Parser Derived Struct?

Question

The documentation has got me confused. I'm kind of stuck on how to get matches from a parser derived struct. How would I go about doing this? Here's what my argument struct looks like.

#[derive(Parser)]
#[clap(author, version, about, long_about = None)]
pub struct Args {
    /// Host address
    #[clap(short, long)]
    pub host: String,
    /// Database username
    #[clap(short, long)]
    pub username: String,
    /// Database password
    #[clap(short='P', long)]
    pub password: String,
    /// Database name
    #[clap(short='d', long)]
    pub database: String,
    /// Database port number
    #[clap(short, long, default_value_t = 3306)]
    pub port: u32,
}

Answer 1

The clap::Parser trait has a method parse that you can use, that will read the arguments into a structure of the type, or exit the process on error.

use clap::Parser;

#[derive(Parser)]
#[clap(author, version, about, long_about = None)]
pub struct Args {
    /// Host address
    #[clap(short, long)]
    pub host: String,
    ...
}

fn main() {
  let args = Args::parse();
  println!("got host: {}", args.host);
}