Do not pick up by default the LLVM style if passing -format

[v.g.vassilev]

Summary

This adds a new flag -style which is passed to clang-apply-replacements and defaults to file meaning it would pick up the closest .clang-format file in tree.

[v.g.vassilev]

Use string.

[bkramer]

Looks good, but I'm wondering if we should also change the default in clang-apply-replacements itself.

[v.g.vassilev]

Changing the default of clang-apply-replacements makes sense to me.

This one landed in r305125.

clang-tidy/tool/run-clang-tidy.py

except:
     sys.exit(1)
 
 
 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')
+  if args.style:
+    invocation.append('-style=' + args.style)
   invocation.append(tmpdir)
   subprocess.call(invocation)
 
 
 def run_tidy(args, tmpdir, build_path, queue):
   """Takes filenames out of queue and runs clang-tidy on them."""
   while True:
     name = queue.get()
parser.add_argument('-header-filter', default=None,
                       '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('-style', default='file', help='The style of 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=[],