Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/setuptools/tests/contexts.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 import tempfile
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2 import os
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3 import shutil
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4 import sys
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5 import contextlib
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6 import site
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7
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8 from ..compat import StringIO
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9
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10
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11 @contextlib.contextmanager
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12 def tempdir(cd=lambda dir:None, **kwargs):
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13 temp_dir = tempfile.mkdtemp(**kwargs)
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14 orig_dir = os.getcwd()
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15 try:
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16 cd(temp_dir)
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17 yield temp_dir
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18 finally:
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19 cd(orig_dir)
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20 shutil.rmtree(temp_dir)
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21
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22
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23 @contextlib.contextmanager
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24 def environment(**replacements):
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25 """
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26 In a context, patch the environment with replacements. Pass None values
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27 to clear the values.
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28 """
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29 saved = dict(
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30 (key, os.environ[key])
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31 for key in replacements
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32 if key in os.environ
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33 )
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34
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35 # remove values that are null
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36 remove = (key for (key, value) in replacements.items() if value is None)
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37 for key in list(remove):
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38 os.environ.pop(key, None)
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39 replacements.pop(key)
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40
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41 os.environ.update(replacements)
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42
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43 try:
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44 yield saved
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45 finally:
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46 for key in replacements:
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47 os.environ.pop(key, None)
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48 os.environ.update(saved)
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49
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50
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51 @contextlib.contextmanager
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52 def quiet():
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53 """
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54 Redirect stdout/stderr to StringIO objects to prevent console output from
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55 distutils commands.
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56 """
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57
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58 old_stdout = sys.stdout
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59 old_stderr = sys.stderr
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60 new_stdout = sys.stdout = StringIO()
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61 new_stderr = sys.stderr = StringIO()
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62 try:
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63 yield new_stdout, new_stderr
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64 finally:
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65 new_stdout.seek(0)
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66 new_stderr.seek(0)
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67 sys.stdout = old_stdout
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68 sys.stderr = old_stderr
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69
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70
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71 @contextlib.contextmanager
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72 def save_user_site_setting():
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73 saved = site.ENABLE_USER_SITE
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74 try:
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75 yield saved
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76 finally:
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77 site.ENABLE_USER_SITE = saved
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78
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79
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80 @contextlib.contextmanager
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81 def suppress_exceptions(*excs):
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82 try:
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83 yield
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84 except excs:
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85 pass