Command-line utility that transcribes a number to the mayan numeral system. Written in rust.

README.md

maya.rs

Command-line utility that transcribes a number to the mayan numeral system. Other implementations

Usage

Compile the program with: rustc maya.rs. Then run ./maya 2017

Result

╔════╦════╦════╗
║    ║    ║ ●● ║
║    ║    ║————║
║    ║    ║————║
║————║ Θ  ║————║
╚════╩════╩════╝

(and indeed, 2017 = 5 x 20^2 + 0 x 20^1 + (3*5 + 2) x 20^0)

maya.rs

fn main() {
    let arg = std::env::args().nth(1).map(|s| s.parse());
    match arg {
        Some(Ok(n)) => mayan_print(n),
        _ => {
            eprintln!("Usage:\n\tmaya NUMBER");
            std::process::exit(1);
        }
    }
}

const ONES: [&str; 5] = ["", "●", "●●", "●●●", "●●●●"];
const FIVE: &str = "————";
const ZERO: &str = "Θ";

fn print_line<I: Iterator<Item = &'static str>>(
    start: &str,
    separator: &str,
    end: &str,
    components: I,
) {
    print!("{}", start);
    for (i, component) in components.enumerate() {
        if i != 0 {
            print!("{}", separator);
        }
        print!("{:^4}", component);
    }
    println!("{}", end);
}

fn mayan_decomposition(mut num: u64) -> Vec<(u8, u8)> {
    let size = (64 - num.leading_zeros() as usize) / 4;
    let mut parts = Vec::with_capacity(size);
    while num > 0 {
        let units = num % 5;
        num -= units;
        let fives = (num % 20) / 5;
        num -= fives * 5;
        num /= 20;
        parts.push((units as u8, fives as u8));
    }
    parts.reverse();
    parts
}

fn mayan_print(num: u64) {
    let parts = mayan_decomposition(num);

    let horiz_lines = std::iter::repeat("════").take(parts.len());

    print_line("╔", "╦", "╗", horiz_lines.clone());

    for i in (0..4).rev() {
        print_line(
            "║",
            "║",
            "║",
            parts.iter().map(|&(units, fives)| {
                if units == 0 && fives == 0 && i == 0 {
                    ZERO
                } else if i < fives {
                    FIVE
                } else if i == fives {
                    ONES[units as usize]
                } else {
                    ""
                }
            }),
        );
    }

    print_line("╚", "╩", "╝", horiz_lines.clone());
}