Initial commit: demo todo CLI with Claude Code setup

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/cli.js

@@ -0,0 +1,28 @@
+#!/usr/bin/env node
+import { load, save, add, complete, remove, format } from "./todo.js";
+
+const FILE = process.env.TODO_FILE ?? "todos.json";
+const [cmd, ...args] = process.argv.slice(2);
+let todos = load(FILE);
+
+switch (cmd) {
+  case "add":
+    todos = add(todos, args.join(" "));
+    break;
+  case "done":
+    todos = complete(todos, Number(args[0]));
+    break;
+  case "rm":
+    todos = remove(todos, Number(args[0]));
+    break;
+  case "ls":
+  case undefined:
+    console.log(format(todos));
+    process.exit(0);
+  default:
+    console.error(`Unknown command: ${cmd}\nUsage: todo [ls | add <text> | done <id> | rm <id>]`);
+    process.exit(1);
+}
+
+save(FILE, todos);
+console.log(format(todos));

src/todo.js

@@ -0,0 +1,28 @@
+import { readFileSync, writeFileSync, existsSync } from "node:fs";
+
+export function load(path) {
+  if (!existsSync(path)) return [];
+  return JSON.parse(readFileSync(path, "utf8"));
+}
+
+export function save(path, todos) {
+  writeFileSync(path, JSON.stringify(todos, null, 2) + "\n");
+}
+
+export function add(todos, text) {
+  const id = todos.length + 1;
+  return [...todos, { id, text, done: false }];
+}
+
+export function complete(todos, id) {
+  return todos.map((t) => (t.id === id ? { ...t, done: true } : t));
+}
+
+export function remove(todos, id) {
+  return todos.filter((t) => t.id !== id);
+}
+
+export function format(todos) {
+  if (todos.length === 0) return "Nothing to do.";
+  return todos.map((t) => `${t.done ? "[x]" : "[ ]"} ${t.id}. ${t.text}`).join("\n");
+}