diff --git a/scripts/run_clang_tidy.py.bak b/scripts/run_clang_tidy.py.bak
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+++ b/scripts/run_clang_tidy.py.bak
@@ -0,0 +1,217 @@
+#!/usr/bin/env python
+#
+#===- run-clang-tidy.py - Parallel clang-tidy runner ---------*- python -*--===#
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+#===------------------------------------------------------------------------===#
+# FIXME: Integrate with clang-tidy-diff.py
+
+"""
+Parallel clang-tidy runner
+==========================
+
+Runs clang-tidy over all files in a compilation database. Requires clang-tidy
+and clang-apply-replacements in $PATH.
+
+Example invocations.
+- Run clang-tidy on all files in the current working directory with a default
+  set of checks and show warnings in the cpp files and all project headers.
+    run-clang-tidy.py $PWD
+
+- Fix all header guards.
+    run-clang-tidy.py -fix -checks=-*,llvm-header-guard
+
+- Fix all header guards included from clang-tidy and header guards
+  for clang-tidy headers.
+    run-clang-tidy.py -fix -checks=-*,llvm-header-guard extra/clang-tidy \
+                      -header-filter=extra/clang-tidy
+
+Compilation database setup:
+http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
+"""
+
+import argparse
+import json
+import multiprocessing
+import os
+import Queue
+import re
+import shutil
+import subprocess
+import sys
+import tempfile
+import threading
+
+
+def find_compilation_database(path):
+  """Adjusts the directory until a compilation database is found."""
+  result = './'
+  while not os.path.isfile(os.path.join(result, path)):
+    if os.path.realpath(result) == '/':
+      print 'Error: could not find compilation database.'
+      sys.exit(1)
+    result += '../'
+  return os.path.realpath(result)
+
+
+def get_tidy_invocation(f, clang_tidy_binary, checks, tmpdir, build_path,
+                        header_filter, extra_arg, extra_arg_before, quiet):
+  """Gets a command line for clang-tidy."""
+  start = [clang_tidy_binary]
+  if header_filter is not None:
+    start.append('-header-filter=' + header_filter)
+  else:
+    # Show warnings in all in-project headers by default.
+    start.append('-header-filter=^' + build_path + '/.*')
+  if checks:
+    start.append('-checks=' + checks)
+  if tmpdir is not None:
+    start.append('-export-fixes')
+    # Get a temporary file. We immediately close the handle so clang-tidy can
+    # overwrite it.
+    (handle, name) = tempfile.mkstemp(suffix='.yaml', dir=tmpdir)
+    os.close(handle)
+    start.append(name)
+  for arg in extra_arg:
+      start.append('-extra-arg=%s' % arg)
+  for arg in extra_arg_before:
+      start.append('-extra-arg-before=%s' % arg)
+  start.append('-p=' + build_path)
+  if quiet:
+      start.append('-quiet')
+  start.append(f)
+  return start
+
+
+def apply_fixes(args, tmpdir):
+  """Calls clang-apply-fixes on a given directory. Deletes the dir when done."""
+  invocation = [args.clang_apply_replacements_binary]
+  if args.format:
+    invocation.append('-format')
+  invocation.append(tmpdir)
+  subprocess.call(invocation)
+  shutil.rmtree(tmpdir)
+
+
+def run_tidy(args, tmpdir, build_path, queue):
+  """Takes filenames out of queue and runs clang-tidy on them."""
+  while True:
+    name = queue.get()
+    invocation = get_tidy_invocation(name, args.clang_tidy_binary, args.checks,
+                                     tmpdir, build_path, args.header_filter,
+                                     args.extra_arg, args.extra_arg_before,
+                                     args.quiet)
+    sys.stdout.write(' '.join(invocation) + '\n')
+    subprocess.call(invocation)
+    queue.task_done()
+
+
+def main():
+  parser = argparse.ArgumentParser(description='Runs clang-tidy over all files '
+                                   'in a compilation database. Requires '
+                                   'clang-tidy and clang-apply-replacements in '
+                                   '$PATH.')
+  parser.add_argument('-clang-tidy-binary', metavar='PATH',
+                      default='clang-tidy',
+                      help='path to clang-tidy binary')
+  parser.add_argument('-clang-apply-replacements-binary', metavar='PATH',
+                      default='clang-apply-replacements',
+                      help='path to clang-apply-replacements binary')
+  parser.add_argument('-checks', default=None,
+                      help='checks filter, when not specified, use clang-tidy '
+                      'default')
+  parser.add_argument('-header-filter', default=None,
+                      help='regular expression matching the names of the '
+                      'headers to output diagnostics from. Diagnostics from '
+                      'the main file of each translation unit are always '
+                      'displayed.')
+  parser.add_argument('-j', type=int, default=0,
+                      help='number of tidy instances to be run in parallel.')
+  parser.add_argument('files', nargs='*', default=['.*'],
+                      help='files to be processed (regex on path)')
+  parser.add_argument('-fix', action='store_true', help='apply fix-its')
+  parser.add_argument('-format', action='store_true', help='Reformat code '
+                      'after applying fixes')
+  parser.add_argument('-p', dest='build_path',
+                      help='Path used to read a compile command database.')
+  parser.add_argument('-extra-arg', dest='extra_arg',
+                      action='append', default=[],
+                      help='Additional argument to append to the compiler '
+                      'command line.')
+  parser.add_argument('-extra-arg-before', dest='extra_arg_before',
+                      action='append', default=[],
+                      help='Additional argument to prepend to the compiler '
+                      'command line.')
+  parser.add_argument('-quiet', action='store_true',
+                      help='Run clang-tidy in quiet mode')
+  args = parser.parse_args()
+
+  db_path = 'compile_commands.json'
+
+  if args.build_path is not None:
+    build_path = args.build_path
+  else:
+    # Find our database
+    build_path = find_compilation_database(db_path)
+
+  try:
+    invocation = [args.clang_tidy_binary, '-list-checks']
+    invocation.append('-p=' + build_path)
+    if args.checks:
+      invocation.append('-checks=' + args.checks)
+    invocation.append('-')
+    print subprocess.check_output(invocation)
+  except:
+    print >>sys.stderr, "Unable to run clang-tidy."
+    sys.exit(1)
+
+  # Load the database and extract all files.
+  database = json.load(open(os.path.join(build_path, db_path)))
+  files = [entry['file'] for entry in database]
+
+  max_task = args.j
+  if max_task == 0:
+    max_task = multiprocessing.cpu_count()
+
+  tmpdir = None
+  if args.fix:
+    tmpdir = tempfile.mkdtemp()
+
+  # Build up a big regexy filter from all command line arguments.
+  file_name_re = re.compile('|'.join(args.files))
+
+  try:
+    # Spin up a bunch of tidy-launching threads.
+    queue = Queue.Queue(max_task)
+    for _ in range(max_task):
+      t = threading.Thread(target=run_tidy,
+                           args=(args, tmpdir, build_path, queue))
+      t.daemon = True
+      t.start()
+
+    # Fill the queue with files.
+    for name in files:
+      if file_name_re.search(name):
+        queue.put(name)
+
+    # Wait for all threads to be done.
+    queue.join()
+
+  except KeyboardInterrupt:
+    # This is a sad hack. Unfortunately subprocess goes
+    # bonkers with ctrl-c and we start forking merrily.
+    print '\nCtrl-C detected, goodbye.'
+    if args.fix:
+      shutil.rmtree(tmpdir)
+    os.kill(0, 9)
+
+  if args.fix:
+    print 'Applying fixes ...'
+    apply_fixes(args, tmpdir)
+
+if __name__ == '__main__':
+  main()
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