easy_install: add support for installing from wheels

Note: wheels are installed as eggs, so each install is self-contained
and multiple versions of the same package can be installed at the same
time.

Limitations:
- headers are not supported
- resulting egg metadata requirements have their markers stripped

1 files changed, 32 insertions, 0 deletions

diff --git a/setuptools/command/easy_install.py b/setuptools/command/easy_install.py
index 71991efa..12e22310 100755
--- a/setuptools/command/easy_install.py
+++ b/setuptools/command/easy_install.py
@@ -53,6 +53,7 @@ from setuptools.package_index import (
     PackageIndex, parse_requirement_arg, URL_SCHEME,
 )
 from setuptools.command import bdist_egg, egg_info
+from setuptools.wheel import Wheel
 from pkg_resources import (
     yield_lines, normalize_path, resource_string, ensure_directory,
     get_distribution, find_distributions, Environment, Requirement,
@@ -842,6 +843,8 @@ class easy_install(Command):
             return [self.install_egg(dist_filename, tmpdir)]
         elif dist_filename.lower().endswith('.exe'):
             return [self.install_exe(dist_filename, tmpdir)]
+        elif dist_filename.lower().endswith('.whl'):
+            return [self.install_wheel(dist_filename, tmpdir)]
 
         # Anything else, try to extract and build
         setup_base = tmpdir
@@ -1038,6 +1041,35 @@ class easy_install(Command):
                     f.write('\n'.join(locals()[name]) + '\n')
                     f.close()
 
+    def install_wheel(self, wheel_path, tmpdir):
+        wheel = Wheel(wheel_path)
+        assert wheel.is_compatible()
+        destination = os.path.join(self.install_dir, wheel.egg_name())
+        destination = os.path.abspath(destination)
+        if not self.dry_run:
+            ensure_directory(destination)
+        if os.path.isdir(destination) and not os.path.islink(destination):
+            dir_util.remove_tree(destination, dry_run=self.dry_run)
+        elif os.path.exists(destination):
+            self.execute(
+                os.unlink,
+                (destination,),
+                "Removing " + destination,
+            )
+        try:
+            self.execute(
+                wheel.install_as_egg,
+                (destination,),
+                ("Installing %s to %s") % (
+                    os.path.basename(wheel_path),
+                    os.path.dirname(destination)
+                ),
+            )
+        finally:
+            update_dist_caches(destination, fix_zipimporter_caches=False)
+        self.add_output(destination)
+        return self.egg_distribution(destination)
+
     __mv_warning = textwrap.dedent("""
         Because this distribution was installed --multi-version, before you can
         import modules from this package in an application, you will need to