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use std::env;
use std::fs::File;
use std::io;
use std::io::BufRead;
use std::ops;
use std::result::Result;
#[derive(Debug, Clone, Copy)]
struct Count {
lines: usize,
words: usize,
chars: usize,
}
impl Count {
fn new() -> Self {
Count {
lines: 0,
words: 0,
chars: 0,
}
}
fn count(&mut self, line: &str) {
self.count_line();
self.count_words_in_line(line);
self.count_chars_in_line(line);
}
fn count_line(&mut self) {
self.lines += 1;
}
fn count_words_in_line(&mut self, line: &str) {
let mut in_word = false;
for c in line.chars() {
if c.is_alphabetic() {
if !in_word {
in_word = true;
self.words += 1;
}
} else {
in_word = false;
}
}
}
fn count_chars_in_line(&mut self, line: &str) {
// add +1 for newline, which we ASSUME is there
self.chars += line.chars().count() + 1;
}
}
impl ops::AddAssign for Count {
fn add_assign(&mut self, other: Count) {
self.lines += other.lines;
self.words += other.words;
self.chars += other.chars;
}
}
fn main() -> Result<(), io::Error> {
let mut total = Count::new();
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)?;
total += c;
println!("{:>5} {:>5} {:>5} {}", c.lines, c.words, c.chars, filename);
}
if env::args().skip(1).count() > 1 {
println!("{:>5} {:>5} {:>5} {}", total.lines, total.words, total.chars, "total");
}
Ok(())
}
fn wc(reader: &mut io::BufReader<File>) -> Result<Count, io::Error> {
let mut count = Count::new();
for line in reader.lines() {
let line = line?;
count.count(&line);
}
Ok(count)
}
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