Attempt to improve performance by eliminating a sleep call

pre_commit/languages/python.py

@@ -1,18 +1,9 @@
 
-import contextlib
 from plumbum import local
-from plumbum.machines.session import ShellSession
 
 PY_ENV = 'py_env'
 
 
-@contextlib.contextmanager
-def in_env():
-    with ShellSession(local['bash'].popen()) as env:
-        env.run('source {0}/bin/activate'.format(PY_ENV))
-        yield env
-
-
 def install_environment():
     assert local.path('setup.py').exists()
     # Return immediately if we already have a virtualenv
@@ -21,16 +12,14 @@ def install_environment():
 
     # Install a virtualenv
     local['virtualenv'][PY_ENV]()
-
-    with in_env() as env:
-        # Run their setup.py
-        env.run('pip install .')
+    local['bash']['-c', 'source {0}/bin/activate && pip install .'.format(PY_ENV)]()
 
 
 def run_hook(hook, file_args):
-    with in_env() as env:
-        # TODO: batch filenames
-        return env.run(
-            ' '.join([hook['entry']] + hook.get('args', []) + list(file_args)),
-            retcode=None,
-        )
+    # TODO: batch filenames
+    return local['bash'][
+        '-c', ' '.join(
+            ['source {0}/bin/activate &&'.format(PY_ENV)] +
+            [hook['entry']] + hook.get('args', []) + list(file_args)
+        )
+    ].run()