chewy 3.0.1

A command-line RPN calculator.
Documentation 
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use std::env;
use std::io;
use std::io::prelude::*;

use chewy::execute;

fn main() -> Result<(), std::io::Error> {
    let mut stack: Vec<i128> = Vec::new();

    let args: Vec<_> = env::args().collect();
    if let Some(flag) = args.get(1) {
        if flag == "--version" {
            execute(&mut stack, "V q");
        } else {
            println!("Usage, interactive: chewy");
            println!("   non-interactive: echo \"1 2 3 + *\" | chewy");
            println!("");
            execute(&mut stack, "h q");
        }
    }

    let stdin = io::stdin();

    for line in stdin.lock().lines() {
        execute(&mut stack, &line?);
    }

    Ok(())
}