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lines: self, + current: 0, + } + } +} + +impl Iterator for Accumulator { + type Item = u32; + + fn next(&mut self) -> Option { + while let Some(Ok(line)) = self.lines.next() { + let line = line.trim(); + if line.is_empty() { + let result = self.current; + self.current = 0; + return Some(result); + } else { + self.current += line.parse::().unwrap(); + } + } + None + } +} + +fn main() { + let matches = Command::new("Day1").arg(Arg::new("filename")).get_matches(); + let filename = matches + .get_one::("filename") + .expect("Need a filename"); + println!("Processing {}...", filename); + + let file = File::open(filename).expect("Can't read file"); + let reader = BufReader::new(file); + + let mut calories = reader.lines().elf().collect::>(); + calories.sort_by(|a, b| b.cmp(a)); + println!("Sum: {:?}", calories.iter().take(3).sum::()) +}