Function initCommand

src/cli/init.ts:35–122

()

 * Generates a 12-word recovery phrase and derives everything from it.
 */
export async function initCommand(): Promise<void> {
  if (existsSync(DB_PATH)) {
    console.log("SharedContext is already initialized at ~/.sharedcontext/");
    console.log("To reinitialize, delete ~/.sharedcontext/ first.");
    return;
  }

  console.log(BANNER);
  console.log("Initializing SharedContext...\n");

  mkdirSync(SHAREDCONTEXT_DIR, { recursive: true });

  // Generate 12-word recovery phrase
  const words = generatePhrase();

  // Show phrase on alternate screen (like vim/less — vanishes when done)
  const half = PHRASE_WORD_COUNT / 2;
  const idx1 = Math.floor(Math.random() * half); // word 1..6
  const idx2 = half + Math.floor(Math.random() * half); // word 7..12

  // Enter alternate screen buffer
  process.stderr.write("\x1b[?1049h");
  // Move cursor to top and clear
  process.stderr.write("\x1b[H\x1b[2J");

  process.stderr.write("\n  RECOVERY PHRASE — write this down, then confirm below.\n");
  process.stderr.write("  This screen will disappear after confirmation.\n\n");
  process.stderr.write(`  ${words.map((w, i) => `${i + 1}.${w}`).join("  ")}\n\n`);

  const answer = await prompt(
    `  Type word ${idx1 + 1} and ${idx2 + 1} to confirm: `
  );

  // Leave alternate screen — phrase is gone from terminal
  process.stderr.write("\x1b[?1049l");

  const parts = answer.split(/\s+/);
  if (
    parts.length < 2 ||
    parts[0].toLowerCase() !== words[idx1].toLowerCase() ||
    parts[1].toLowerCase() !== words[idx2].toLowerCase()
  ) {
    console.error("Confirmation failed. Please run `sharedcontext init` again.");
    process.exit(1);
  }

  const phrase = phraseToString(words);

  // Derive deterministic identity from phrase
  console.log("\nDeriving identity from recovery phrase...");
  const keypair = deriveKeypairFromPhrase(phrase);

  // Generate random salt for AES key derivation (stored locally + on Arweave)
  const salt = generateSalt();
  writeFileSync(SALT_PATH, Buffer.from(salt), { mode: 0o600 });

  console.log("Deriving encryption key (this takes a few seconds)...");
  const key = deriveKey(phrase, salt);