feat(scripts): add fuzzy picker and tester CLI utilities for LeetCode problems

scripts/pick.ts

@@ -0,0 +1,96 @@
+#!/usr/bin/env bun
+/**
+ * Fuzzy-pick a LeetCode problem and scaffold it via leetcode-cli.
+ * Problem index is fetched from leetcode.com and cached for 24h in .cache/.
+ */
+import { autocomplete, cancel, isCancel, spinner } from "@clack/prompts";
+import { mkdir } from "node:fs/promises";
+import { join } from "node:path";
+
+const ROOT = join(import.meta.dir, "..");
+const CACHE_FILE = join(ROOT, ".cache", "leetcode-problems.json");
+const CACHE_TTL_MS = 24 * 60 * 60 * 1000;
+
+interface Problem {
+  id: number;
+  title: string;
+  slug: string;
+  difficulty: "Easy" | "Medium" | "Hard";
+  paidOnly: boolean;
+}
+
+const DIFFICULTY = ["", "Easy", "Medium", "Hard"] as const;
+
+async function loadProblems(): Promise<Problem[]> {
+  const file = Bun.file(CACHE_FILE);
+  if (await file.exists()) {
+    const stale = Date.now() - file.lastModified > CACHE_TTL_MS;
+    if (!stale) return file.json();
+  }
+
+  const s = spinner();
+  s.start("Fetching problem index from leetcode.com");
+  const res = await fetch("https://leetcode.com/api/problems/all/", {
+    headers: { "user-agent": "Mozilla/5.0" },
+  });
+  if (!res.ok) {
+    s.error(`Fetch failed: ${res.status} ${res.statusText}`);
+    process.exit(1);
+  }
+  const data = (await res.json()) as {
+    stat_status_pairs: Array<{
+      stat: {
+        frontend_question_id: number;
+        question__title: string;
+        question__title_slug: string;
+      };
+      difficulty: { level: 1 | 2 | 3 };
+      paid_only: boolean;
+    }>;
+  };
+  const problems: Problem[] = data.stat_status_pairs
+    .map((p) => ({
+      id: p.stat.frontend_question_id,
+      title: p.stat.question__title,
+      slug: p.stat.question__title_slug,
+      difficulty: DIFFICULTY[p.difficulty.level] as Problem["difficulty"],
+      paidOnly: p.paid_only,
+    }))
+    .sort((a, b) => a.id - b.id);
+  s.stop(`Loaded ${problems.length} problems`);
+
+  await mkdir(join(ROOT, ".cache"), { recursive: true });
+  await Bun.write(CACHE_FILE, JSON.stringify(problems));
+  return problems;
+}
+
+const problems = await loadProblems();
+
+const picked = await autocomplete<Problem>({
+  message: "Pick a problem",
+  placeholder: "Type to search by number or title...",
+  maxItems: 12,
+  options: problems.map((p) => ({
+    value: p,
+    label: `${p.id}. ${p.title}`,
+    hint: p.paidOnly ? `${p.difficulty} 🔒 premium` : p.difficulty,
+  })),
+  filter: (search, option) => {
+    const haystack = option.label!.toLowerCase();
+    return search
+      .toLowerCase()
+      .split(/\s+/)
+      .every((token) => haystack.includes(token));
+  },
+});
+
+if (isCancel(picked)) {
+  cancel("Nothing picked.");
+  process.exit(0);
+}
+
+const proc = Bun.spawn(
+  [join(ROOT, "node_modules", ".bin", "leetcode"), "pick", picked.slug],
+  { cwd: ROOT, stdio: ["inherit", "inherit", "inherit"] },
+);
+process.exit(await proc.exited);

scripts/test.ts

@@ -0,0 +1,54 @@
+#!/usr/bin/env bun
+/**
+ * Fuzzy-select a solution file from work/ and run leetcode-cli tests on it.
+ */
+import { autocomplete, cancel, isCancel, log } from "@clack/prompts";
+import { join, relative } from "node:path";
+
+const ROOT = join(import.meta.dir, "..");
+const WORK_DIR = join(ROOT, "work");
+
+const files = [...new Bun.Glob("**/*.{js,ts,py,java,c,cpp,go,rs,rb,swift,kt,cs}").scanSync({ cwd: WORK_DIR })]
+  .sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));
+
+if (files.length === 0) {
+  log.error(`No solution files found in ${relative(process.cwd(), WORK_DIR)}/`);
+  process.exit(1);
+}
+
+const picked = await autocomplete<string>({
+  message: "Test which solution?",
+  placeholder: "Type to search...",
+  maxItems: 12,
+  options: files.map((f) => {
+    // work layout: Difficulty/Category/<id>.<slug>.<ext>
+    const [difficulty, category, name] = f.split("/");
+    return {
+      value: f,
+      label: name ?? f,
+      hint: category ? `${difficulty} · ${category}` : difficulty,
+    };
+  }),
+  filter: (search, option) => {
+    const haystack = option.value.toLowerCase();
+    return search
+      .toLowerCase()
+      .split(/\s+/)
+      .every((token) => haystack.includes(token));
+  },
+});
+
+if (isCancel(picked)) {
+  cancel("Nothing selected.");
+  process.exit(0);
+}
+
+const proc = Bun.spawn(
+  [
+    join(ROOT, "node_modules", ".bin", "leetcode"),
+    "test",
+    join(WORK_DIR, picked),
+  ],
+  { cwd: ROOT, stdio: ["inherit", "inherit", "inherit"] },
+);
+process.exit(await proc.exited);