adventofcode/2022/07/part1.js

import * as R from "remeda";
import { readFile } from "../05/part1.js";
import path from "path";

const readInput = (...args) =>
  readFile(...args)
    .split("\n")
    .filter((x) => x);

export const puzzleInput = readInput(import.meta.url, "input");
export const sample = readInput(import.meta.url, "sample");

export function parseInput(lines) {
  lines = [...lines];

  let currentDir = "/";

  const data = {};

  while (lines.length > 0) {
    const line = lines.shift();

    let match = line.match(/\$ cd (.*)/);
    if (match) {
      currentDir = match[1].startsWith("/")
        ? match[1]
        : path.join(currentDir, match[1]);
      if (!data[currentDir]) data[currentDir] = 0;
      continue;
    }

    if (/^\d+/.test(line)) {
      const [size] = line.match(/\d+/);
      data[currentDir] += parseInt(size);
    }
  }

  return data;
}

export function cumulative(individual) {
  const isIn = (k, targetKey) => {
    const result =
      k === targetKey ||
      k.startsWith(targetKey.endsWith("/") ? targetKey : targetKey + "/");
    return result;
  };

  return R.pipe(
    individual,
    R.mapValues((v, targetKey) => {
      const sum = R.sumBy(
        Object.values(R.pickBy(individual, (v, k) => isIn(k, targetKey))),
        R.identity
      );
      return sum;
    })
  );
}

export default R.createPipe(
  parseInput,
  cumulative,
  R.pickBy((v) => v <= 100000),
  R.values,
  R.sumBy(R.identity)
);