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

native_client_sdk/src/tools/nacl_config.py

 #!/usr/bin/env python
 # Copyright 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.
 
 """A helper script to print paths of NaCl binaries, includes, libs, etc.
 
 It is similar in behavior to pkg-config or sdl-config.
 """
 
-import optparse
+import argparse
 import os
 import posixpath
 import sys
 
 import getos
 
 
 if sys.version_info < (2, 6, 0):
   sys.stderr.write("python 2.6 or later is required run this script\n")
   sys.exit(1)
@@ skipping 193 matching lines @@
 def GetIncludeDirs(toolchain):
   ExpectToolchain(toolchain, VALID_TOOLCHAINS)
   return ' '.join(GetSDKIncludeDirs(toolchain))
 
 
 def GetLDFlags():
   return '-L%s' % GetSDKLibDir()
 
 
 def main(args):
-  usage = 'Usage: %prog [options] <command>'
-  parser = optparse.OptionParser(usage=usage, description=__doc__)
-  parser.add_option('-t', '--toolchain', help='toolchain name. This can also '
-                    'be specified with the NACL_TOOLCHAIN environment '
-                    'variable.')
-  parser.add_option('-a', '--arch', help='architecture name. This can also be '
-                    'specified with the NACL_ARCH environment variable.')
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('-t', '--toolchain', help='toolchain name. This can also '
+                      'be specified with the NACL_TOOLCHAIN environment '
+                      'variable.')
+  parser.add_argument('-a', '--arch', help='architecture name. This can also '
+                      'be specified with the NACL_ARCH environment variable.')
 
-  group = optparse.OptionGroup(parser, 'Commands')
-  group.add_option('--tool', help='get tool path')
-  group.add_option('--cflags',
-                    help='output all preprocessor and compiler flags',
-                    action='store_true')
-  group.add_option('--libs', '--ldflags', help='output all linker flags',
-                    action='store_true')
-  group.add_option('--include-dirs',
-                   help='output include dirs, separated by spaces',
-                   action='store_true')
-  parser.add_option_group(group)
+  group = parser.add_argument_group('Commands')
+  group.add_argument('--tool', help='get tool path')
+  group.add_argument('--cflags',
+                     help='output all preprocessor and compiler flags',
+                     action='store_true')
+  group.add_argument('--libs', '--ldflags', help='output all linker flags',
+                     action='store_true')
+  group.add_argument('--include-dirs',
+                     help='output include dirs, separated by spaces',
+                     action='store_true')
 
-  options, _ = parser.parse_args(args)
+  options = parser.parse_args(args)
 
   # Get toolchain/arch from environment, if not specified on commandline
   options.toolchain = options.toolchain or os.getenv('NACL_TOOLCHAIN')
   options.arch = options.arch or os.getenv('NACL_ARCH')
 
   options.toolchain = CanonicalizeToolchain(options.toolchain)
   CheckValidToolchainArch(options.toolchain, options.arch)
 
   if options.cflags:
     print GetCFlags(options.toolchain)
   elif options.include_dirs:
     print GetIncludeDirs(options.toolchain)
   elif options.libs:
     print GetLDFlags()
   elif options.tool:
     print GetToolPath(options.toolchain, options.arch, options.tool)
   else:
     parser.error('Expected a command. Run with --help for more information.')
 
   return 0
 
 
 if __name__ == '__main__':
   try:
     sys.exit(main(sys.argv[1:]))
   except Error as e:
     sys.stderr.write(str(e) + '\n')
     sys.exit(1)