Fix the build script to be able to build more than one generator.

mojom/tools/build_generators.py

Index: mojom/tools/build_generators.py
diff --git a/mojom/tools/build_generators.py b/mojom/tools/build_generators.py
index 9663e9333ec9eb13b2f5f60c2131fa3e38d3a07a..9e1d8bfcfc095166bf5ee412601c580b43ae3999 100755
--- a/mojom/tools/build_generators.py
+++ b/mojom/tools/build_generators.py
@@ -15,13 +15,18 @@ import builder
 
 
 def main():
-  parser = builder.get_arg_parser("Build the mojom generators.")
+  parser = builder.get_arg_parser('Build the mojom generators.')
+  parser.add_argument('--generators', dest='generators', type=str, default=None,
+      action='store', help='')

[rudominer, 2016/04/25 23:16:05]

I think a help string with an example would be useful.

[azani, 2016/04/26 00:03:27]

Woops, I forgot the help string. Right now, there is only deps, so I don't think
an example is useful here.

   args = parser.parse_args()
 
   generators = [
       'deps',

[rudominer, 2016/04/25 23:16:05]

The default should be to build all of the generators, right?

[azani, 2016/04/26 00:03:27]

It is.

       ]
 
+  if args.generators:
+    generators = args.generators.split(',')
+
   final_result = 0
   for generator in generators:
     generator_builder = builder.get_builder(
@@ -38,7 +43,7 @@ def main():
       if not args.keep_going:
         return result
 
-    return final_result
+  return final_result
 
 
 if __name__ == '__main__':