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use std::env;
use std::fs::File;
use std::io;
use std::io::BufRead;
use std::result::Result;
struct Count {
lines: usize,
words: usize,
chars: usize,
}
fn main() -> Result<(), io::Error> {
for filename in env::args().skip(1) {
let mut f = File::open(&filename)?;
let mut reader = io::BufReader::new(f);
let c = wc(&mut reader)?;
println!("{:>5} {:>5} {:>5} {}", c.lines, c.words, c.chars, filename);
}
Ok(())
}
fn wc(reader: &mut io::BufReader<File>) -> Result<Count, io::Error> {
let mut count = Count {lines: 0, words: 0, chars: 0};
for line in reader.lines() {
let line = line?;
count_line(&line, &mut count);
}
Ok(count)
}
fn count_line(line: &str, count: &mut Count) {
// we have a line!
count.lines += 1;
// add +1 for newline, which we ASSUME is there
count.chars += line.chars().count() + 1;
// count words
let mut in_word: bool = false;
for c in line.chars() {
if c.is_alphabetic() {
if !in_word {
in_word = true;
count.words += 1;
}
} else {
in_word = false;
}
}
}
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