Port common input fetcher helpers, cleanup, and add tests

2021/nim/.gitignore

@@ -0,0 +1,3 @@
+*
+!.gitignore
+!*.nim

2022/deno/common.ts

@@ -0,0 +1,55 @@
+import { copy } from "https://deno.land/std@0.167.0/streams/copy.ts";
+import * as path from "https://deno.land/std@0.167.0/path/mod.ts";
+import { readLines } from "https://deno.land/std@0.167.0/io/buffer.ts";
+import { readerFromStreamReader } from "https://deno.land/std@0.167.0/streams/reader_from_stream_reader.ts";
+
+const YEAR: number = parseInt(Deno.env.get("AOC_YEAR") || "2022");
+const HOME = Deno.env.get("HOME");
+if (!HOME) throw new Error("HOME not set");
+const COOKIE_PATH = path.resolve(`${HOME}/.advent-of-code-session-cookie`);
+const CACHE_DIR = path.resolve(`${HOME}/.cache/aoc${YEAR}`);
+
+async function loadSessionCookie() {
+  const td = new TextDecoder();
+  const bytes = await Deno.readFile(COOKIE_PATH);
+  return td.decode(bytes);
+}
+
+function inputFilePath(day: number): string {
+  return path.resolve(path.join(CACHE_DIR, `${day}.input`));
+}
+
+async function fetchAndCacheInput(day: number): Promise<void> {
+  const req = new Request(`https://adventofcode.com/${YEAR}/day/${day}/input`);
+  req.headers.set("Cookie", await loadSessionCookie());
+  const resp = await fetch(req);
+  const f = await Deno.open(inputFilePath(day), { write: true });
+  if (!resp.body) {
+    throw new Error("Response had empty body");
+  }
+  await copy(readerFromStreamReader(resp.body.getReader()), f);
+}
+
+export async function inputLines(
+  day: number,
+  fetched = false,
+): Promise<AsyncIterableIterator<string>> {
+  try {
+    return readLines(await Deno.open(inputFilePath(day), { read: true }));
+  } catch (e) {
+    if (!fetched) {
+      await fetchAndCacheInput(day);
+      return await inputLines(day, true);
+    } else {
+      throw e;
+    }
+  }
+}
+
+export async function inputLinesArray(day: number) {
+  const lines = [];
+  for await (const l of await inputLines(day)) {
+    lines.push(l);
+  }
+  return lines;
+}

2022/deno/day1.ts

@@ -1,19 +1,47 @@
-const tDec = new TextDecoder();
-const input = tDec.decode(Deno.readFileSync("../inputs/day1.input"));
+import { inputLinesArray } from "./common.ts";
 
-console.log(
-  "final",
-  input.split("\n\n").map((p) => {
-    const ns = p.split("\n").map((s) => {
-      const n = parseInt(s, 10);
-      console.log("inner", s, n);
-      return n;
-    }).filter((n) => !isNaN(n));
-    if (ns.length < 1) return NaN;
-    const n = ns.reduce((prev, cur) => prev + cur, 0);
-    console.log("oter", p, n, ns);
-    return n;
-  }).filter((n) => !isNaN(n)).sort().reverse(),
-);
+function orderedCalories(lines: string[]) {
+  const calories: number[] = [0];
 
-console.log(71924 + 69893 + 68589);
+  lines.forEach((line) => {
+    if (line.trim() == "") {
+      calories.splice(0, 0, 0);
+    } else {
+      calories[0] += parseInt(line);
+    }
+  });
+  calories.sort((a, b) => b - a);
+  return calories;
+}
+
+const calories = orderedCalories(await inputLinesArray(1));
+console.log("Part 1:", calories[0]);
+console.log("Part 2:", calories.slice(0, 3).reduce((a, b) => a + b));
+
+const TEST_INPUT = `1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000`.split("\n");
+
+Deno.test("orderedCalories", async (t) => {
+  const { assertEquals } = await import(
+    "https://deno.land/std@0.167.0/testing/asserts.ts"
+  );
+
+  const calories = orderedCalories(TEST_INPUT);
+  await t.step("part 1", () => assertEquals(calories[0], 24000));
+  await t.step(
+    "part 2",
+    () => assertEquals(calories.slice(0, 3).reduce((a, b) => a + b), 45000),
+  );
+});