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their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +clap = "4.0.29" diff --git a/day2/src/main.rs b/day2/src/main.rs new file mode 100644 index 0000000..c3cca6d --- /dev/null +++ b/day2/src/main.rs @@ -0,0 +1,58 @@ +use std::fs::File; +use std::io::BufRead; +use std::io::BufReader; +use std::io::Lines; + +use clap::Arg; +use clap::Command; + +struct Accumulator { + lines: Lines, + current: u32, +} + +trait Elvish { + fn elf(self) -> Accumulator; +} + +impl Elvish for Lines { + fn elf(self) -> Accumulator { + Accumulator { + 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::()) +}