[recipes.py] move doc arg parsing to its module

R=dnj@chromium.org, phajdan.jr@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2847623002

recipe_engine/doc.py

@@ -18,6 +18,7 @@
 
 from . import config
 from . import doc_pb2 as doc
+from . import loader
 from . import recipe_api
 from . import types
 from . import util
@@ -456,30 +457,48 @@ def _set_known_objects(base):
       raise ValueError('could not find %r in %r' % (k, relpath))
 
 
-def main(universe_view, recipe, kind):
+def add_subparser(parser):
+  doc_kinds=('binarypb', 'jsonpb', 'textpb', 'markdown(github)',
+             'markdown(gitiles)')
+  doc_p = parser.add_parser(
+      'doc',
+      description='List all known modules reachable from the current package, '
+          'with their documentation')
+  doc_p.add_argument('recipe', nargs='?',
+                     help='Restrict documentation to this recipe')
+  doc_p.add_argument('--kind', default='jsonpb', choices=doc_kinds,
+                     help='Output this kind of documentation')
+
+  doc_p.set_defaults(command='doc', func=main)
+
+
+def main(package_deps, args):
+  universe = loader.RecipeUniverse(package_deps, args.package)
+  universe_view = loader.UniverseView(universe, package_deps.root_package)
+
   logging.basicConfig()
 
   spec = universe_view.package.repo_spec.spec_pb()
   base_dir = universe_view.package.repo_root
   if spec.recipes_path:
     base_dir = join(base_dir, spec.recipes_path)
 
-  if recipe:
-    recipe_fullpath = universe_view.find_recipe(recipe)
+  if args.recipe:
+    recipe_fullpath = universe_view.find_recipe(args.recipe)
     relpath = _to_posix(os.path.relpath(recipe_fullpath, base_dir))
-    node = parse_recipe(universe_view, base_dir, relpath, recipe)
+    node = parse_recipe(universe_view, base_dir, relpath, args.recipe)
   else:
     node = parse_package(universe_view, base_dir, spec)
 
   _set_known_objects(node)
 
-  if kind == 'jsonpb':
+  if args.kind == 'jsonpb':
     sys.stdout.write(jsonpb.MessageToJson(
       node, including_default_value_fields=True,
       preserving_proto_field_name=True))
-  elif kind == 'binarypb':
+  elif args.kind == 'binarypb':
     sys.stdout.write(node.SerializeToString())
-  elif kind == 'textpb':
+  elif args.kind == 'textpb':
     sys.stdout.write(textpb.MessageToString(node))
   else:
-    raise NotImplementedError('--kind=%s' % kind)
+    raise NotImplementedError('--kind=%s' % args.kind)

recipes.py

@@ -241,16 +241,6 @@ def __call__(self, parser, namespace, values, option_string=None):
     v[project_id] = path
 
 
-def doc(config_file, package_deps, args):
-  from recipe_engine import doc
-  from recipe_engine import loader
-
-  universe = loader.RecipeUniverse(package_deps, config_file)
-  universe_view = loader.UniverseView(universe, package_deps.root_package)
-
-  doc.main(universe_view, args.recipe, args.kind)
-
-
 # Map of arguments_pb2.Property "value" oneof conversion functions.
 #
 # The fields here should be kept in sync with the "value" oneof field names in
@@ -375,8 +365,8 @@ def main():
   common_postprocess_func = add_common_args(parser)
 
   from recipe_engine import fetch, lint_test, bundle, depgraph, autoroll
-  from recipe_engine import remote, refs
-  to_add = [fetch, lint_test, bundle, depgraph, autoroll, remote, refs]
+  from recipe_engine import remote, refs, doc
+  to_add = [fetch, lint_test, bundle, depgraph, autoroll, remote, refs, doc]
 
   subp = parser.add_subparsers()
   for module in to_add:
@@ -459,18 +449,6 @@ def properties_type(value):
            'issue=12345. The property value will be decoded as JSON, but if '
            'this decoding fails the value will be interpreted as a string.')
 
-  doc_kinds=('binarypb', 'jsonpb', 'textpb', 'markdown(github)',
-             'markdown(gitiles)')
-  doc_p = subp.add_parser(
-      'doc',
-      description='List all known modules reachable from the current package, '
-          'with their documentation')
-  doc_p.add_argument('recipe', nargs='?',
-                     help='Restrict documentation to this recipe')
-  doc_p.add_argument('--kind', default='jsonpb', choices=doc_kinds,
-                     help='Output this kind of documentation')
-  doc_p.set_defaults(command='doc')
-
   args = parser.parse_args()
   common_postprocess_func(parser, args)
   if hasattr(args, 'postprocess_func'):
@@ -551,8 +529,6 @@ def _real_main(args):
     return test(config_file, package_deps, args)
   elif args.command == 'run':
     return run(config_file, package_deps, args)
-  elif args.command == 'doc':
-    return doc(config_file, package_deps, args)
   else:
     print """Dear sir or madam,
         It has come to my attention that a quite impossible condition has come