[clang-tidy] Update run-clang-tidy.py with vfsoverlay arg

[jdemeule]

Summary

Updating the run-clang-tidy.py script to allow specification of the
vfsoverlay argument to the clang-tidy invocation.

[jdemeule]

kindly ping reviewers.

[jdemeule]

Kindly ping reviewers.

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

 
 def make_absolute(f, directory):
   if os.path.isabs(f):
     return f
   return os.path.normpath(os.path.join(directory, f))
 
 
 def get_tidy_invocation(f, clang_tidy_binary, checks, tmpdir, build_path,
-                        header_filter, extra_arg, extra_arg_before, quiet,
-                        config):
+                        vfsoverlay, header_filter, extra_arg, extra_arg_before,
+                        quiet, config):
   """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 vfsoverlay is not None:
+    start.append('-vfsoverlay=' + vfsoverlay)
   if quiet:
       start.append('-quiet')
   if config:
       start.append('-config=' + config)
   start.append(f)
   return start
 
 
def apply_fixes(args, tmpdir):
   subprocess.call(invocation)
 
 
 def run_tidy(args, tmpdir, build_path, queue, failed_files):
   """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, args.config)
+                                     tmpdir, build_path, args.vfsoverlay,
+                                     args.header_filter, args.extra_arg,
+                                     args.extra_arg_before, args.quiet,
+                                     args.config)
     sys.stdout.write(' '.join(invocation) + '\n')
     return_code = subprocess.call(invocation)
     if return_code != 0:
       failed_files.append(name)
     queue.task_done()
 
 
 def main():
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('-vfsoverlay', dest='vfsoverlay',
+                      help='Overlay the virtual filesystem described by file '
+                      'over the real file system.')
   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.')