79 lines
1.6 KiB
JavaScript
79 lines
1.6 KiB
JavaScript
import * as R from "remeda";
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import fs from "fs-extra";
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import path from "path";
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import { fileURLToPath } from "url";
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export const readFile = (url, file) =>
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fs.readFileSync(path.join(fileURLToPath(new URL(".", url)), file), "utf8");
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export const sample = readFile(import.meta.url, "sample");
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export const puzzleInput = readFile(import.meta.url, "input");
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function parseHeaps(text) {
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const lines = text.split("\n").filter(R.identity);
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lines.reverse();
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let [header, ...crates] = lines;
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const stacks = [];
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while (header.trimEnd()) {
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header = header.replace(/^(\s+)\d/, (...args) => {
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crates = crates.map((c) => c.slice(args[1].length));
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const stack = [];
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crates = crates.map((l) =>
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l.replace(/./, (c) => {
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if (c !== " ") stack.push(c);
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return "";
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})
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);
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stacks.push(stack);
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return "";
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});
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}
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return stacks;
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}
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function parseCommands(text) {
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return text
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.split("\n")
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.filter(R.identity)
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.map((line) => line.match(/\d+/g).map((x) => parseInt(x)));
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}
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function moveStacks([stacks, commands]) {
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for (let [move, from, to] of commands) {
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console.log({ move, from, to });
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while (move-- > 0) {
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stacks[to - 1].push(stacks[from - 1].pop());
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}
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}
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return stacks;
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}
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export const spy = (x) => {
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console.log(x);
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return x;
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};
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export const parseLines = ([heaps, commands]) => [
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parseHeaps(heaps),
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parseCommands(commands),
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];
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export const solutionPart1 = R.createPipe(
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(text) => text.split("\n\n"),
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parseLines,
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moveStacks,
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R.map((x) => x.pop()),
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(x) => x.join("")
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);
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