abi3 wheel idea

since you seem to be the guinea pig of abi3 and I know how much you love `setup.py` :)



here's an idea that lets you delete your PEP517/pip hack :D



https://github.com/asottile/onigurumacffi/pull/3



let me know if you'd like me to send a PR (obvs I'd run the pre-commit hooks 😉):



```diff

$ git diff | cat

diff --git a/setup.py b/setup.py

index e0fd787..44396b4 100644

--- a/setup.py

+++ b/setup.py

@@ -204,7 +204,10 @@ def keywords_with_side_effects(argv):

             "setup_requires": SETUP_REQUIRES,

             "cffi_modules": CFFI_MODULES,

             "libraries": LIBRARIES,

-            "cmdclass": {"build_clib": BuildCLibWithCompilerFlags},

+            "cmdclass": {

+                "bdist_wheel": BDistWheel,

+                "build_clib": BuildCLibWithCompilerFlags,

+            },

         }

 

 

@@ -331,6 +334,24 @@ class BuildCLibWithCompilerFlags(build_clib):

             )

 

 

+if (

+        sys.platform != 'win32' and

+        sys.version_info > (3,) and

+        platform.python_implementation() == 'CPython'

+):

+    try:

+        import wheel.bdist_wheel

+    except ImportError:

+        BDistWheel = None

+    else:

+        class BDistWheel(wheel.bdist_wheel.bdist_wheel):

+            def finalize_options(self) -> None:

+                self.py_limited_api = 'cp3{}'.format(sys.version_info[1])

+                wheel.bdist_wheel.bdist_wheel.finalize_options(self)

+else:

+    BDistWheel = None

+

+

 if __name__ == "__main__":

     setup(

         name=NAME,

```



```console

$ pip --version

pip 20.0.2 from /tmp/argon2-cffi/venv/lib/python3.6/site-packages/pip (python 3.6)

$ pip wheel . --no-deps

Processing /tmp/argon2-cffi

  Installing build dependencies ... done

  Getting requirements to build wheel ... done

    Preparing wheel metadata ... done

Building wheels for collected packages: argon2-cffi

  Building wheel for argon2-cffi (PEP 517) ... done

  Created wheel for argon2-cffi: filename=argon2_cffi-19.3.0.dev0-cp36-abi3-linux_x86_64.whl size=86910 sha256=987b258636a492e3d0eb4da9fb26882bf9af5ff9cddda55e8c7989ce99f08e62

  Stored in directory: /home/asottile/.cache/pip/wheels/ac/f2/65/3db4b7f5e358d48745b9910295753dd37080e71619eb97312d

Successfully built argon2-cffi

$ ls *.whl

argon2_cffi-19.3.0.dev0-cp36-abi3-linux_x86_64.whl

```

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