Function walk

src/context/tree.ts:140–193

(dir: string, depth: number, prefix: string, ctx: TreeContext)

}

async function walk(dir: string, depth: number, prefix: string, ctx: TreeContext): Promise<void> {
  if (depth > ctx.maxDepth || ctx.entryCount >= ctx.maxEntries || ctx.truncated) return;

  let entries: import('fs').Dirent[];
  try {
    entries = await fs.readdir(dir, { withFileTypes: true });
  } catch {
    return;
  }

  // Filter ignored + hidden (except .github which is informative)
  entries = entries
    .filter(e => {
      if (IGNORED_DIRS.has(e.name) || IGNORED_FILES.has(e.name)) return false;
      if (e.name.startsWith('.') && e.name !== '.github') return false;
      return true;
    })
    .sort((a, b) => {
      if (a.isDirectory() !== b.isDirectory()) return a.isDirectory() ? -1 : 1;
      return a.name.localeCompare(b.name);
    });

  for (let i = 0; i < entries.length; i++) {
    if (ctx.entryCount >= ctx.maxEntries || ctx.truncated) {
      pushLine(prefix + '... (truncated)', ctx);
      return;
    }

    const entry = entries[i]!;
    const isLast = i === entries.length - 1;
    const connector = isLast ? '└── ' : '├── ';
    const childPrefix = prefix + (isLast ? '    ' : '│   ');

    if (entry.isDirectory()) {
      const expand = depth >= ctx.maxDepth ? false : shouldExpandDir(entry.name, ctx);
      if (!expand) {
        // Summarise: name + child count + truncation marker
        const summary = await summariseDir(path.join(dir, entry.name));
        pushLine(prefix + connector + entry.name + '/  ' + summary, ctx);
      } else {
        pushLine(prefix + connector + entry.name + '/', ctx);
        await walk(path.join(dir, entry.name), depth + 1, childPrefix, ctx);
      }
    } else {
      pushLine(prefix + connector + entry.name, ctx);
    }

    if (ctx.byteCount > ctx.maxBytes) {
      pushLine(prefix + '... (size limit reached)', ctx);
      ctx.truncated = true;
      return;
    }
  }
}

/** Cheap one-line summary of a directory: `(N items)`. Best-effort; failure → empty. */
async function summariseDir(dir: string): Promise<string> {