import { existsSync } from 'fs';
import { join } from 'path';

// cm:why A git worktree is a whole second copy of the repo. One app kept fifteen under
// `.claude/worktrees/`: 11,340 calls of which 10,485 were copies, so one file answered as sixteen.
// cm:why The rule is not "skip `.claude`" — a subtree carrying its own `.git` is a DIFFERENT
// checkout, whoever put it there and whatever they named the directory.
// cm:edge lockstep -> packages/cli/src/commands/scanFe.ts — both walks apply this.
// cm:why The scan ROOT is never tested: the walk only asks about directories it is about to descend
// into.
export function isNestedCheckout(dir: string): boolean {
  return existsSync(join(dir, '.git'));
}