Tom Miller | 7c95d81 | 2010-10-11 11:50:52 -0700 | [diff] [blame^] | 1 | # Copyright (C) 2010 Google Inc. |
| 2 | # |
| 3 | # Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | # you may not use this file except in compliance with the License. |
| 5 | # You may obtain a copy of the License at |
| 6 | # |
| 7 | # http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | # |
| 9 | # Unless required by applicable law or agreed to in writing, software |
| 10 | # distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | # See the License for the specific language governing permissions and |
| 13 | # limitations under the License. |
| 14 | |
| 15 | """Utility functions for setup.py file(s).""" |
| 16 | |
| 17 | |
| 18 | __author__ = 'tom.h.miller@gmail.com (Tom Miller)' |
| 19 | |
| 20 | |
| 21 | def get_missing_requirements(): |
| 22 | """Return a list of missing third party packages.""" |
| 23 | import sys |
| 24 | |
| 25 | sys_path_original = sys.path[:] |
| 26 | # Remove the current directory from the list of paths to check when |
| 27 | # importing modules. |
| 28 | try: |
| 29 | # Sometimes it's represented by an empty string? |
| 30 | sys.path.remove('') |
| 31 | except ValueError: |
| 32 | import os.path |
| 33 | sys.path.remove(os.path.abspath(os.path.curdir)) |
| 34 | missing_pkgs = [] |
| 35 | third_party_reqs = ['oauth2', 'httplib2'] |
| 36 | for pkg in third_party_reqs: |
| 37 | try: |
| 38 | __import__(pkg) |
| 39 | except ImportError: |
| 40 | missing_pkgs.append(pkg) |
| 41 | # JSON support gets its own special logic |
| 42 | try: |
| 43 | import_json(sys.path) |
| 44 | except ImportError: |
| 45 | missing_pkgs.append('simplejson') |
| 46 | |
| 47 | sys.path = sys_path_original |
| 48 | return missing_pkgs |
| 49 | |
| 50 | |
| 51 | def import_json(import_path=None): |
| 52 | """Return a package that will provide JSON support. |
| 53 | |
| 54 | Args: |
| 55 | import_path: list Value to assing to sys.path before checking for packages. |
| 56 | Default None for default sys.path. |
| 57 | Return: |
| 58 | A package, one of 'json' (if running python 2.6), |
| 59 | 'django.utils.simplejson' (if django is installed) |
| 60 | 'simplejson' (if third party library simplejson is found) |
| 61 | Raises: |
| 62 | ImportError if none of those packages are found. |
| 63 | """ |
| 64 | import sys |
| 65 | sys_path_orig = sys.path[:] |
| 66 | if import_path is not None: |
| 67 | sys.path = import_path |
| 68 | |
| 69 | try: |
| 70 | # Should work for Python 2.6. |
| 71 | pkg = __import__('json') |
| 72 | except ImportError: |
| 73 | try: |
| 74 | pkg = __import__('django.utils').simplejson |
| 75 | except ImportError: |
| 76 | try: |
| 77 | pkg = __import__('simplejson') |
| 78 | except ImportError: |
| 79 | pkg = None |
| 80 | |
| 81 | if import_path is not None: |
| 82 | sys.path = sys_path_orig |
| 83 | if pkg: |
| 84 | return pkg |
| 85 | else: |
| 86 | raise ImportError('Cannot find json support') |