Advent of Code helper

This crate provides a macro to generate a handful main for your advent of code participation. The intention is to provide something similar to cargo-aoc through a much simple code base.

Currently this will only provide a few benefits:

• a somewhat pretty orchestration of your solutions

• automatic download and loading of your input files

• generation of criterion benchmarks

Usage

The generator and solutions for a given day must be implemented in a module called dayX. Then you can simply invoke the aoc_main::main! macro in your main.rs:

mod day1 {
    pub fn generator(input: &str) -> Vec<u64> {
        input
            .lines()
            .map(|line| line.parse().unwrap())
            .collect()
    }

    pub fn part_1(input: &[u64]) -> u64 {
        input.iter().map(|&mass| mass / 3 - 2).sum()
    }

    pub fn part_2(input: &[u64]) -> u64 {
        fn total_needed_mass(obj: u64) -> u64 {
            if obj < 9 {
                0
            } else {
                let obj_mass = obj / 3 - 2;
                obj_mass + total_needed_mass(obj_mass)
            }
        }

        input.iter().copied().map(total_needed_mass).sum()
    }
}

mod day2;
mod day3;

aoc_main::main! {
    year 2019;
    day1 : generator => part_1, part_2;
    day2 : generator => part_1, part_2, part_2_optimized;
    day3             => part_1, part_2; // no generator, a &str is passed
}

Then you can simply run cargo run!

Note that your solutions must take a borrowed version of the generator's output. Also, the generator can output a structure that contains borrowed data from the original input file.

Benchmarks

You can run Criterion benchmarks by running cargo run --release -- --bench, but first you need to enable the bench feature in your cargo.toml:

[dependencies]
aoc-main = { version = "*", features = ["bench"] }

Fetching your AOC token

When the command line asks you for your session token, you can apply the following procedure (quoted from cargo-aoc):

• Firefox: "Storage" tab, Cookies, and copy the "Value" field of the session cookie.
• Google Chrome / Chromium: "Application" tab, Cookies, and copy the "Value" field of the session cookie.

If you wish to change or forget your connection token, you will have to remove aoc in your config directory (eg. $HOME/.config/aoc for linux users).