run.js

const moment = require("moment");
const { readFileSync, readdirSync, lstatSync } = require("fs");
const { join } = require("path");

function run(year, day, part) {
  let log = process.env.NODE_ENV !== "test";
  part = part.toString().slice(-1);
  day = day.toString().length === 1 ? "0".concat(day) : day;
  year = year.toString().length === 2 ? "20".concat(year) : year;

  let input = readFileSync(`./${year}/${day}/input.txt`, "utf-8")
    .trimRight()
    .split("\n");
  let startTime = moment();

  if (log) console.log(`${year}.${day}.${part} running...`);

  let answer = require(`./${year}/${day}/part${part}`)(
    input.length === 1 ? input[0] : input
  );

  if (log) console.log(`${year}.${day}.${part} answer: `, answer);

  let endTime = moment();

  if (log)
    console.log(
      `${year}.${day}.${part} time: `,
      moment(endTime.diff(startTime)).format("mm:ss:SSSS")
    );

  return answer;
}

const getDirectories = (s) =>
  readdirSync(s)
    .map((n) => join(s, n))
    .filter((p) => lstatSync(p).isDirectory());

module.exports = (year, day, part) => {
  if (year === "latest") {
    year = Math.max.apply(
      null,
      getDirectories("./")
        .map((d) => parseInt(d, 10))
        .filter(isFinite)
    );
    day = Math.max.apply(
      null,
      getDirectories(`./${year}/`)
        .map((d) => parseInt(d.slice(-2), 10))
        .filter(isFinite)
    );
  }

  if (!part) {
    run(year, day, 1);
    console.log();
    run(year, day, 2);
  } else {
    return run(year, day, part);
  }
};