import { ensureDir, path, readAll, readLines } from "./deps.ts"; export const HOME = Deno.env.get("HOME") || "/tmp"; export const XDG_CACHE_HOME = Deno.env.get("XDG_CACHE_HOME") || path.join(HOME, ".config"); const INPUT_CACHE_DIR = path.join(XDG_CACHE_HOME, "aoc2021"); async function fileExists(filePath: string) { try { await Deno.lstat(filePath); return true; } catch (e) { if (e instanceof Deno.errors.NotFound) { return false; } throw e; } } function inputFilePath(day: string) { return path.join(INPUT_CACHE_DIR, `${day}.input`); } async function ensureInput(day: string) { const filePath = inputFilePath(day); await ensureDir(INPUT_CACHE_DIR); if (await fileExists(filePath)) return; const cookieFile = path.join(HOME, ".advent-of-code-2021-auth-cookie"); let cookie = ""; try { cookie = Deno.env.get("ADVENT_OF_CODE_2021_AUTH_COOKIE") || new TextDecoder().decode( await readAll(await Deno.open(cookieFile)), ); } catch (e) { console.error( `Failed to load adventofcode.com cookie from ADVENT_OF_CODE_2021_AUTH_COOKIE environment variable or from file ${cookieFile}`, ); throw e; } const url = `https://adventofcode.com/2021/day/${day}/input`; const response = await fetch(url, { headers: { cookie } }); await Deno.writeTextFile(filePath, await response.text()); } async function fileLines( filePath: string, ): Promise> { return readLines(await Deno.open(filePath)); } /** Returns an generator that will yield lines of input for the given Advent of * Code 2021 day. */ export async function inputLines( day: string, ): Promise> { await ensureInput(day); return fileLines(inputFilePath(day)); } async function* readStringsAsNumbers( input: AsyncIterableIterator, ): AsyncIterableIterator { for await (const s of input) { yield parseInt(s); } } /** Returns an generator that will yield lines of input parsed as integers for * the given Advent of Code 2021 day. */ export async function inputNumbers( day: string, ): Promise> { return readStringsAsNumbers(await inputLines(day)); } export async function* asyncIterator( array: T[], ): AsyncIterableIterator { for (const v of array) { yield v; } }