src/main.rs


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use std::env;
use std::fs::File;
use std::io;
use std::io::BufRead;


fn main() -> io::Result<()> {
    for filename in env::args().skip(1) {
        let mut f = File::open(&filename)?;
        let mut reader = io::BufReader::new(f);
        print_words(&mut reader)?;
    }
    Ok(())
}


fn print_words(reader: &mut io::BufReader<File>) -> io::Result<()> {
    for line in reader.lines() {
        let line = line?;
        print_words_in_line(&line);
    }
    Ok(())
}


fn print_words_in_line(line: &str) {
    let mut word = String::new();
    for c in line.chars() {
        if c.is_alphabetic() {
            word.push(c);
        } else {
            if !word.is_empty() {
                println!("{}", word);
            }
            word.clear();
        }
    }
}