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

native_client_sdk/src/doc/doxygen/doxy_cleanup.py

Index: native_client_sdk/src/doc/doxygen/doxy_cleanup.py
diff --git a/native_client_sdk/src/doc/doxygen/doxy_cleanup.py b/native_client_sdk/src/doc/doxygen/doxy_cleanup.py
index d90f214f8e4f78a56be1a78a345091e354cbb0f3..05c02c29de0c01902a4ff9637dc72fd762e73e4b 100755
--- a/native_client_sdk/src/doc/doxygen/doxy_cleanup.py
+++ b/native_client_sdk/src/doc/doxygen/doxy_cleanup.py
@@ -7,12 +7,13 @@
 that they are suitable for publication on a Google documentation site.
 '''
 
+import argparse
 import glob
-import optparse
 import os
 import re
 import shutil
 import sys
+
 try:
   from BeautifulSoup import BeautifulSoup, Tag
 except (ImportError, NotImplementedError):
@@ -147,24 +148,23 @@ class HTMLFixer(object):
     return html
 
 
-def main(argv):
+def main(args):
   """Main entry for the doxy_cleanup utility
 
   doxy_cleanup cleans up the html files generated by doxygen.
   """
 
-  parser = optparse.OptionParser(usage='Usage: %prog [options] directory')
-  parser.add_option('-v', '--verbose', help='verbose output.',
-                    action='store_true')
-  options, files = parser.parse_args(argv)
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('-v', '--verbose', help='verbose output.',
+                      action='store_true')
+  parser.add_argument('directory')
 
-  if len(files) != 1:
-    parser.error('Expected one directory')
+  options = parser.parse_args(args)
 
   if options.verbose:
     Trace.verbose = True
 
-  root_dir = files[0]
+  root_dir = options.directory
   html_dir = os.path.join(root_dir, 'html')
 
   # Doxygen puts all files in an 'html' directory.