Enable Downloading Wheels by Default

* Switches the default in pip.index.PackageFinder to True
* Supresses --use-wheel
* Adds --no-use-wheel which prevents the use of Wheel

pip/cmdoptions.py

@@ -267,7 +267,17 @@ use_wheel = OptionMaker(
     '--use-wheel',
     dest='use_wheel',
     action='store_true',
-    help='Find and prefer wheel archives when searching indexes and find-links locations. Default to accepting source archives.')
+    help=SUPPRESS_HELP,
+)
+
+no_use_wheel = OptionMaker(
+    '--no-use-wheel',
+    dest='use_wheel',
+    action='store_false',
+    default=True,
+    help=('Do not Find and prefer wheel archives when searching indexes and '
+          'find-links locations.'),
+)
 
 download_cache = OptionMaker(
     '--download-cache',

pip/commands/install.py

@@ -137,6 +137,7 @@ class InstallCommand(Command):
             help="Install everything relative to this alternate root directory.")
 
         cmd_opts.add_option(cmdoptions.use_wheel.make())
+        cmd_opts.add_option(cmdoptions.no_use_wheel.make())
 
         cmd_opts.add_option(
             '--pre',

pip/commands/wheel.py

@@ -49,6 +49,7 @@ class WheelCommand(Command):
             default=DEFAULT_WHEEL_DIR,
             help="Build wheels into <dir>, where the default is '<cwd>/wheelhouse'.")
         cmd_opts.add_option(cmdoptions.use_wheel.make())
+        cmd_opts.add_option(cmdoptions.no_use_wheel.make())
         cmd_opts.add_option(
             '--build-option',
             dest='build_options',

pip/index.py

@@ -37,7 +37,7 @@ class PackageFinder(object):
     """
 
     def __init__(self, find_links, index_urls,
-            use_wheel=False, allow_external=[], allow_unverified=[],
+            use_wheel=True, allow_external=[], allow_unverified=[],
             allow_all_external=False, allow_all_prereleases=False,
             process_dependency_links=False, session=None):
         self.find_links = find_links