@rule(JVMImports, [Select(Snapshot)])
def extract_imports(snapshot):
  # TODO
  cmd = tuple(['/Users/stuhood/src/pants/extractimports'] + [f.path for f in snapshot.files])
  result = yield Get(ExecuteProcessResult,
                     ExecuteProcessRequest(cmd, [], snapshot.fingerprint, snapshot.digest_length))
  if result.exit_code:
    raise Exception('Import extraction `{}` failed ({}):\n{}'.format(
      ' '.join(cmd), result.exit_code, result.stderr))

  def packages():
    matched = set()
    for p in result.stdout.splitlines():
      match = _PACKAGE_RE.match(p.strip())
      if match:
        yield JVMPackageName(match.group(1))

  yield JVMImports(set(packages()))