Fixups + make the tests work

pre_commit/languages/node.py

@@ -50,8 +50,7 @@ def install_environment(
                 node_env.run(
                     "cd '{prefix}' && npm install -g " +
                     ' '.join(
-                        [shell_escape(dep) for dep in
-                         additional_dependencies]
+                        shell_escape(dep) for dep in additional_dependencies
                     )
                 )
 

pre_commit/languages/ruby.py

@@ -93,15 +93,14 @@ def install_environment(
             if version != 'default':
                 _install_ruby(ruby_env, version)
             ruby_env.run(
-                'cd {prefix} && gem build *.gemspec'
-                ' && gem install --no-ri --no-rdoc *.gem',
+                'cd {prefix} && gem build *.gemspec && '
+                'gem install --no-ri --no-rdoc *.gem',
             )
             if additional_dependencies:
                 ruby_env.run(
-                    'cd {prefix} && gem install --no-document ' +
+                    'cd {prefix} && gem install --no-ri --no-rdoc ' +
                     ' '.join(
-                        shell_escape(dep) for dep in
-                        additional_dependencies
+                        shell_escape(dep) for dep in additional_dependencies
                     )
                 )
 

pre_commit/languages/script.py

@@ -18,7 +18,6 @@ def install_environment(
 def run_hook(repo_cmd_runner, hook, file_args):
     return repo_cmd_runner.run(
         ['xargs', '-0', '{{prefix}}{0}'.format(hook['entry'])] + hook['args'],
-        # TODO: this is duplicated in pre_commit/languages/helpers.py
         stdin=file_args_to_stdin(file_args),
         retcode=None,
         encoding=None,