| # Copyright (C) 2010 Google Inc. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Utility functions for setup.py file(s).""" |
| |
| |
| __author__ = 'tom.h.miller@gmail.com (Tom Miller)' |
| |
| import sys |
| |
| |
| def is_missing(packages): |
| """Return True if a package can't be imported.""" |
| |
| retval = True |
| sys_path_original = sys.path[:] |
| # Remove the current directory from the list of paths to check when |
| # importing modules. |
| try: |
| # Sometimes it's represented by an empty string? |
| sys.path.remove('') |
| except ValueError: |
| import os.path |
| try: |
| sys.path.remove(os.path.abspath(os.path.curdir)) |
| except ValueError: |
| pass |
| if not isinstance(packages, type([])): |
| packages = [packages] |
| for name in packages: |
| try: |
| __import__(name) |
| retval = False |
| except ImportError: |
| retval = True |
| if retval == False: |
| break |
| |
| sys.path = sys_path_original |
| |
| return retval |