Minor tweaks. Tests still pass on OSH but fail on other shells.

core/builtin.py

@@ -482,9 +482,11 @@ def Cd(argv, mem):
  state.SetGlobalString(mem, 'PWD', dest_dir)
  return 0


def PrintDirStack(dir_stack):
  if len(dir_stack) > 0:
    sys.stdout.write(' '.join(dir_stack) + '\n');
  if dir_stack:
    print(' '.join(dir_stack))


def Pushd(argv, dir_stack):
  num_args = len(argv)
@@ -501,9 +503,9 @@ def Pushd(argv, dir_stack):
  except OSError as e:
    util.error("pushd: %r: %s", dest_dir, os.strerror(e.errno))
    return 1

  dir_stack.append(os.getcwd())
  PrintDirStack(dir_stack)

  return 0


@@ -516,11 +518,11 @@ def Popd(argv, dir_stack):

  try:
    os.chdir(dest_dir)
    PrintDirStack(dir_stack)
  except OSError as e:
    util.error("popd: %r: %s", dest_dir, os.strerror(e.errno))
    return 1

  PrintDirStack(dir_stack)
  return 0