Saves files from an FTP server with a .txt extension

ftp_txt_save.rs

extern crate ftp;

use std::fs::File;
use std::str;
use std::io::{Result, Write};
use ftp::FtpStream;

fn main() {
    get_txt_ftp("127.0.0.1", "<username>", "<password>").unwrap_or_else(|err|
        panic!("{}", err)
    );
}

fn get_txt_ftp(addr: &str, user: &str, pass: &str) -> Result<()> {
    let mut ftp_stream = try!(FtpStream::connect((addr, 21)));
    try!(ftp_stream.login(user, pass));

    println!("Current dir: {}", try!(ftp_stream.pwd()));

    let file_list = try!(ftp_stream.nlst(None));

    let files: Vec<String> = file_list.into_iter()
        .filter(|name| name.ends_with(".txt")) // This could be replaced by regex if needed
        .collect();

    for file in files {
        println!("Saving: {}", file);
        try!(ftp_stream.retr(file.as_str(), |stream| {
            let mut file = File::create(file.clone()).unwrap();
            let mut buf = [0; 2048];

            loop {
              match stream.read(&mut buf) {
                Ok(0) => break,
                Ok(n) => file.write_all(&buf[0..n]).unwrap(),
                Err(err) => return Err(err)
              };
            }

            Ok(())
        }));
    }

    ftp_stream.quit()
}