Command-line argument processing about stella2

[yvt]

https://www.reddit.com/r/rust/comments/exbbes/argh_is_googles_opinionated_derivebased_argument/

[yvt]

Base version: 3aebf68

#[derive(argh::FromArgs)]
/// A lightweight instant messaging client.
struct Args {
    /// the path to a custom profile directory
    #[argh(option)]
    profile: Option<String>,
}

let measure_start = unsafe { std::arch::x86_64::_rdtsc() };
let _: Args = argh::from_env();
let measure_end = unsafe { std::arch::x86_64::_rdtsc() };
dbg!(measure_end - measure_start);

Library	CPU cycles¹	.text size
None	0	462848
argh	20569	475136 (+12KiB)
gumdrop	23549	475136 (+12KiB)
clap (minimum)	283296	860160 (+388KiB)
pico-args²	26356	475136 (+12KiB)

¹ The minimum value of circa 10 samples. To simulate the common usage, no command-line arguments were provided.

² pico-args does not support help generation. The application handles -h manually and prints a pre-formatted help message.

[yvt]

Implemented a custom command-line parsing solution in ed5e0d8.

Library	CPU cycles¹	.text size
None	0	462848
Custom Solution	20977	471040 (+8KiB)