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import tempfile
import os
import shutil
import sys
import contextlib
import site
from ..compat import StringIO
@contextlib.contextmanager
def tempdir(cd=lambda dir:None, **kwargs):
temp_dir = tempfile.mkdtemp(**kwargs)
orig_dir = os.getcwd()
try:
cd(temp_dir)
yield temp_dir
finally:
cd(orig_dir)
shutil.rmtree(temp_dir)
@contextlib.contextmanager
def environment(**replacements):
"""
In a context, patch the environment with replacements. Pass None values
to clear the values.
"""
saved = dict(
(key, os.environ[key])
for key in replacements
if key in os.environ
)
# remove values that are null
remove = (key for (key, value) in replacements.items() if value is None)
for key in list(remove):
os.environ.pop(key, None)
replacements.pop(key)
os.environ.update(replacements)
try:
yield saved
finally:
for key in replacements:
os.environ.pop(key, None)
os.environ.update(saved)
@contextlib.contextmanager
def quiet():
"""
Redirect stdout/stderr to StringIO objects to prevent console output from
distutils commands.
"""
old_stdout = sys.stdout
old_stderr = sys.stderr
new_stdout = sys.stdout = StringIO()
new_stderr = sys.stderr = StringIO()
try:
yield new_stdout, new_stderr
finally:
new_stdout.seek(0)
new_stderr.seek(0)
sys.stdout = old_stdout
sys.stderr = old_stderr
@contextlib.contextmanager
def save_user_site_setting():
saved = site.ENABLE_USER_SITE
try:
yield saved
finally:
site.ENABLE_USER_SITE = saved
@contextlib.contextmanager
def suppress_exceptions(*excs):
try:
yield
except excs:
pass
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