Function parse_verbosity 

pub fn parse_verbosity(in_s: &str) -> Result<usize, String>

Parse verbosity like “error”, “warn”, …

For use with clap. E.g.:

use rustradio::parse_verbosity;
#[derive(clap::Parser)]
struct Opt {
    #[arg(long, value_parser=parse_verbosity)]
    verbose: usize,
}

Errors

If the log level is not one of the known strings.