Merge pull request #28 from pre-commit/use_c_loader

Use the CLoader when present to validate yaml

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 720eec7..39d83d3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,6 @@
     - TOXENV=py33
     - TOXENV=py34
     - TOXENV=pypy
-    - TOXENV=pypy3
 install: pip install coveralls tox --use-mirrors
 script: tox
 # Special snowflake.  Our tests depend on making real commits.

pre_commit_hooks/check_yaml.py

diff --git a/pre_commit_hooks/check_yaml.py b/pre_commit_hooks/check_yaml.py
index 0085807..293352f 100644
--- a/pre_commit_hooks/check_yaml.py
+++ b/pre_commit_hooks/check_yaml.py
@@ -6,6 +6,12 @@
 import yaml
 
 
+try:
+    from yaml.cyaml import CLoader as Loader
+except ImportError:  # pragma: no cover (no libyaml-dev / pypy)
+    Loader = yaml.Loader
+
+
 def check_yaml(argv=None):
     parser = argparse.ArgumentParser()
     parser.add_argument('filenames', nargs='*', help='Yaml filenames to check.')
@@ -14,7 +20,7 @@
     retval = 0
     for filename in args.filenames:
         try:
-            yaml.load(open(filename))
+            yaml.load(open(filename), Loader=Loader)
         except yaml.YAMLError as exc:
             print(exc)
             retval = 1

tox.ini

diff --git a/tox.ini b/tox.ini
index b37a773..4b043ba 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 project = pre_commit_hooks
 # These should match the travis env list
-envlist = py26,py27,py33,py34,pypy,pypy3
+envlist = py26,py27,py33,py34,pypy
 
 [testenv]
 install_command = pip install --use-wheel {opts} {packages}