/* -*- mode::rust;indent-tabs-mode::nil -*- 
 * Implementation of 99 Bottles of Beer
 * http://99-bottles-of-beer.net/
 */
use std;
import std::int;
import std::str;

fn b1() -> str { ret "# of beer on the wall, # of beer."; }

fn b2() -> str {
    ret "Take one down and pass it around, # of beer on the wall.";
}

fn b7() -> str {
    ret "No more bottles of beer on the wall, no more bottles of beer.";
}

fn b8() -> str {
    ret "Go to the store and buy some more, # of beer on the wall.";
}

fn sub(str t, int n) -> str {
    let str b = "";
    let uint i = 0u;
    let str ns;
    alt (n) {
        case (0) { ns = "no more bottles"; }
        case (1) { ns = "1 bottle"; }
        case (_) { ns = int::to_str(n, 10u) + " bottles"; }
    }
    while (i < str::byte_len(t)) {
        if (t.(i) == '#' as u8) {
            b += ns;
        } else { str::push_byte(b, t.(i)); }
        i += 1u;
    }
    ret b;
}


/* Straightforward counter */
fn main() {
    let int n = 99;
    while (n > 0) { log sub(b1(), n); log sub(b2(), n - 1); log ""; n -= 1; }
    log b7();
    log sub(b8(), 99);
}