First day

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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Cargo.toml

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+[package]
+name = "advent_of_code_2019"
+version = "0.1.0"
+authors = ["Gaël Berthaud-Müller <blacksponge@tuta.io>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = "2.33"

input/day1

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src/day1.rs

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+use std::io::BufRead;
+
+pub fn part1<F: BufRead> (input: F) {
+    let res: i32 = input.lines()
+        .filter_map(|line| line.unwrap().parse::<i32>().ok())
+        .map(|mass| mass / 3 - 2)
+        .sum();
+    println!("{}", res);
+}
+
+fn recursive_fuel_mass(mass: i32) -> i32 {
+    let fuel_mass = mass / 3 - 2;
+
+    if fuel_mass <= 0 {
+        0
+    } else {
+        fuel_mass + recursive_fuel_mass(fuel_mass)
+    }
+}
+
+pub fn part2<F: BufRead> (input: F) {
+    let res: i32 = input.lines()
+        .filter_map(|line| line.unwrap().parse::<i32>().ok())
+        .map(recursive_fuel_mass)
+        .sum();
+
+    println!("{}", res);
+}

src/main.rs

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+#[macro_use]
+extern crate clap;
+use clap::{Arg, App};
+use std::fs::File;
+use std::io::BufReader;
+
+mod day1;
+
+fn main() {
+    let matches = App::new("Advent of Code 2019")
+        .version("0.1")
+        .arg(Arg::with_name("challenge")
+            .short("c")
+            .long("challenge")
+            .value_name("CHALLENGE")
+            .required(true)
+            .takes_value(true)
+            .min_values(1)
+            .max_values(50))
+        .arg(Arg::with_name("input")
+            .short("i")
+            .long("input")
+            .value_name("INPUT")
+            .required(true)
+            .takes_value(true))
+        .get_matches();
+
+    let input = matches.value_of("input").unwrap();
+    let challenge = value_t!(matches, "challenge", usize).unwrap() - 1;
+
+    let input_file = File::open(input).expect("Unable to open input file");
+    let reader = BufReader::new(input_file);
+
+    let challenges = [
+        day1::part1, day1::part2
+    ];
+
+    if let Some(f) = challenges.get(challenge) {
+        f(reader);
+    } else {
+        println!("Challenge {}, part {} not unimplemented", challenge / 2 + 1, challenge % 2 +1)
+    }
+}