[recipes.py] Move fetch, lint and bundle parsers to separate modules.

recipe_engine/lint_test.py

 #!/usr/bin/env python
 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Tests that recipes are on their best behavior.
 
 Checks that recipes only import modules from a whitelist.  Imports are
 generally not safe in recipes if they depend on the platform, since
 e.g. you can run a recipe simulation for a Windows recipe on Linux.
@@ skipping 43 matching lines @@
       module_name = val.__name__
       for pattern in whitelist:
         if pattern.match(val.__name__):
           break
       else:
         yield ('In %s:\n'
                '  Non-whitelisted import of %s' %
                (recipe_path, module_name))
 
 
-def main(universe_view, whitelist=[]):
+def add_subparser(parser):
+  lint_p = parser.add_parser(
+      'lint',
+      description='Check recipes for stylistic and hygenic issues')
+  lint_p.add_argument(
+      '--whitelist', '-w', action='append', default=[],
+      help='A regexp matching module names to add to the default whitelist. '
+           'Use multiple times to add multiple patterns,')
+
+  lint_p.set_defaults(command='lint', func=main)
+
+
+def main(package_deps, args):
   from . import loader
-  from . import package
 
-  whitelist = map(re.compile, MODULES_WHITELIST + whitelist)
+  universe = loader.RecipeUniverse(package_deps, args.package)
+  universe_view = loader.UniverseView(universe, package_deps.root_package)
+
+  whitelist = map(re.compile, MODULES_WHITELIST + args.whitelist)
 
   errors = []
   for recipe_path, recipe_name in universe_view.loop_over_recipes():
     errors.extend(
         ImportsTest(recipe_path, recipe_name, whitelist, universe_view))
 
   if errors:
     raise TestFailure('\n'.join(map(str, errors)))
-