davla / advent-of-code-2020

https://adventofcode.com/2020

advent-of-code-2020

This repository contains code for the Advent of Code 2020 (https://adventofcode.com/2020)

Structure

The project is written in Kotlin and built with Gradle (no standalone Kotlin compiler on Debian yet, 😭), so the structure follows the Kotlin application plugin conventions.

All the code is under app/src/main/kotlin, where you can find the directory structure matching the package advent.of.code, Java-style. Each day's puzzles are solved in a namesake singleton object (e.g. advent.of.code.Day1), contained in its own file (e.g. advent/of/code/Day1.kt). These object expose two public methods, called puzzle1 and puzzle2, that take in the list of lines read from the input file and any additional arguments. The signature looks as follows:

fun puzzle1(inputLines: Sequence<String>, args: Iterable<String>)

Running

The code can be run by means of the Gradle task run, exposed by the Java application plugins. The task arguments are, in order:

• dayX - where X is a number, to select the day. Mandatory.
• puzzleX - where X is a number, to select the puzzle. Mandatory.
• The path to the input file. Optional, defaults to the first argument with a .txt extension appended. Can be one of:
  • An absolute path
  • A path relative to the repository root directory
  • A path relative to inputs in the repository root directory.

Some examples, ran from the repository root directory:

./gradlew run --args 'day3 puzzle2'

./gradlew run --args 'day2 puzzle1 data.txt'

./gradlew run --args 'day10 puzzle2 inputs/values.txt'

./gradlew run --args "day7 puzzle1 $HOME/lines.txt"