Factor out bash and activate files

pre_commit/languages/script.py

@@ -1,6 +1,6 @@
 from __future__ import unicode_literals
 
-from pre_commit.languages.helpers import file_args_to_stdin
+from pre_commit.languages import helpers
 
 
 ENVIRONMENT_DIR = None
@@ -9,16 +9,14 @@ ENVIRONMENT_DIR = None
 def install_environment(
         repo_cmd_runner,
         version='default',
-        additional_dependencies=None,
+        additional_dependencies=(),
 ):
     """Installation for script type is a noop."""
     raise AssertionError('Cannot install script repo.')
 
 
 def run_hook(repo_cmd_runner, hook, file_args):
-    return repo_cmd_runner.run(
-        ['xargs', '-0', '{{prefix}}{0}'.format(hook['entry'])] + hook['args'],
-        stdin=file_args_to_stdin(file_args),
-        retcode=None,
-        encoding=None,
+    return helpers.run_hook(
+        (repo_cmd_runner.prefix_dir + hook['entry'],) + tuple(hook['args']),
+        file_args,
     )