How to read user input in Rust?

Question

Editor\'s note: This question refers to parts of Rust that predate Rust 1.0, but the general concept is still valid in Rust 1.0.

I intend to

Answer 1

This is what I have come up with (with some help from the friendly people in the #rust IRC channel on irc.mozilla.org):

use core::io::ReaderUtil;

fn read_lines() -> ~[~str] {
    let mut all_lines = ~[];

    for io::stdin().each_line |line| {
        // each_line provides us with borrowed pointers, but we want to put
        // them in our vector, so we need to *own* the lines
        all_lines.push(line.to_owned());
    }

    all_lines
}

fn main() {
    let all_lines = read_lines();

    for all_lines.eachi |i, &line| {
        io::println(fmt!("Line #%u: %s", i + 1, line));
    }
}

And proof that it works :)

$ rustc readlines.rs
$ echo -en 'this\nis\na\ntest' | ./readlines
Line #1: this
Line #2: is
Line #3: a
Line #4: test