[NaCl SDK] Convert python scripts from optparse to argparse.

native_client_sdk/src/build_tools/verify_ppapi.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Helper script for PPAPI's PRESUBMIT.py to detect if additions or removals of
 PPAPI interfaces have been propagated to the Native Client libraries (.dsc
 files).
 
 For example, if a user adds "ppapi/c/foo.h", we check that the interface has
 been added to "native_client_sdk/src/libraries/ppapi/library.dsc".
 """
 
-import optparse
+import argparse
 import os
 import sys
 
 from build_paths import PPAPI_DIR, SRC_DIR, SDK_LIBRARY_DIR
 import parse_dsc
 
 
 # Add a file to this list if it should not be added to a .dsc file; i.e. if it
 # should not be included in the Native Client SDK. This will silence the
 # presubmit warning.
@@ skipping 135 matching lines @@
           'Should they be added to the Native Client SDK? <<<\n')
       if not e.unexpected:
         should_fail = False
     sys.stderr.write(str(e) + '\n')
     if should_fail:
       return False
   return True
 
 
 def main(args):
-  usage = '%prog <file>...'
-  description = __doc__
-  parser = optparse.OptionParser(usage=usage, description=description)
-  args = parser.parse_args(args)[1]
-  if not args:
-    parser.error('Expected a PPAPI header or source file.')
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('sources', nargs='+')
+  options = parser.parse_args(args)
 
   retval = 0
-  lib_files = PartitionFiles(args)
+  lib_files = PartitionFiles(options.sources)
   directory_list = GetDirectoryList(PPAPI_DIR, relative_to=SRC_DIR)
   for lib_name, filenames in lib_files.iteritems():
     if not filenames:
       continue
 
     changed_filenames, removed_filenames = \
         GetChangedAndRemovedFilenames(filenames, directory_list)
 
     dsc_filename = GetDscFilenameFromLibraryName(lib_name)
     dsc = parse_dsc.LoadProject(dsc_filename)
     dsc_sources_and_headers = GetDscSourcesAndHeaders(dsc)
 
     # Use the relative path to the .dsc to make the error messages shorter.
     rel_dsc_filename = os.path.relpath(dsc_filename, SRC_DIR)
     is_private = lib_name == 'ppapi_cpp_private'
     if not VerifyOrPrintError(rel_dsc_filename, dsc_sources_and_headers,
                               changed_filenames, removed_filenames,
                               is_private=is_private):
       retval = 1
   return retval
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))