Add check-xml hook.

pre_commit_hooks/check_xml.py

@@ -0,0 +1,28 @@
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import argparse
+import io
+import sys
+import xml.sax
+
+
+def check_xml(argv=None):
+    parser = argparse.ArgumentParser()
+    parser.add_argument('filenames', nargs='*', help='XML filenames to check.')
+    args = parser.parse_args(argv)
+
+    retval = 0
+    for filename in args.filenames:
+        try:
+            with io.open(filename, 'rb') as xml_file:
+                xml.sax.parse(xml_file, xml.sax.ContentHandler())
+        except xml.sax.SAXException as exc:
+            print('{0}: Failed to xml parse ({1})'.format(filename, exc))
+            retval = 1
+    return retval
+
+
+if __name__ == '__main__':
+    sys.exit(check_xml())