Add prepare_metadata_for_build_wheel() in build api

poetry/masonry/api.py

@@ -31,6 +31,26 @@ def get_requires_for_build_wheel(config_settings=None):
 get_requires_for_build_sdist = get_requires_for_build_wheel
 
 
+def prepare_metadata_for_build_wheel(metadata_directory, config_settings=None):
+    poetry = Poetry.create(".")
+    builder = WheelBuilder(poetry, SystemEnv(Path(sys.prefix)), NullIO())
+
+    dist_info = Path(metadata_directory, builder.dist_info)
+    dist_info.mkdir()
+
+    if "scripts" in poetry.local_config or "plugins" in poetry.local_config:
+        with (dist_info / "entry_points.txt").open("w") as f:
+            builder._write_entry_points(f)
+
+    with (dist_info / "WHEEL").open("w") as f:
+        builder._write_wheel_file(f)
+
+    with (dist_info / "METADATA").open("w") as f:
+        builder._write_metadata_file(f)
+
+    return dist_info.name
+
+
 def build_wheel(wheel_directory, config_settings=None, metadata_directory=None):
     """Builds a wheel, places it in wheel_directory"""
     poetry = Poetry.create(".")

tests/masonry/test_api.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
 import os
 import tarfile
 import zipfile
 
 from contextlib import contextmanager
 
+from poetry import __version__
 from poetry.masonry import api
+from poetry.utils._compat import Path
+from poetry.utils._compat import decode
 from poetry.utils.helpers import temporary_directory
 
 
@@ -53,3 +59,69 @@ def test_build_sdist():
             namelist = tar.getnames()
 
             assert "my-package-1.2.3/LICENSE" in namelist
+
+
+def test_prepare_metadata_for_build_wheel():
+    entry_points = """\
+[console_scripts]
+extra-script=my_package.extra:main[time]
+my-2nd-script=my_package:main2
+my-script=my_package:main
+
+"""
+    wheel_data = """\
+Wheel-Version: 1.0
+Generator: poetry {}
+Root-Is-Purelib: true
+Tag: py3-none-any
+""".format(
+        __version__
+    )
+    metadata = """\
+Metadata-Version: 2.1
+Name: my-package
+Version: 1.2.3
+Summary: Some description.
+Home-page: https://poetry.eustace.io/
+License: MIT
+Keywords: packaging,dependency,poetry
+Author: Sébastien Eustace
+Author-email: sebastien@eustace.io
+Requires-Python: >=3.6,<4.0
+Classifier: License :: OSI Approved :: MIT License
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Topic :: Software Development :: Build Tools
+Classifier: Topic :: Software Development :: Libraries :: Python Modules
+Provides-Extra: time
+Requires-Dist: cachy[msgpack] (>=0.2.0,<0.3.0)
+Requires-Dist: cleo (>=0.6,<0.7)
+Requires-Dist: pendulum (>=1.4,<2.0); extra == "time"
+Project-URL: Documentation, https://poetry.eustace.io/docs
+Project-URL: Repository, https://github.com/sdispater/poetry
+Description-Content-Type: text/x-rst
+
+My Package
+==========
+
+"""
+    with temporary_directory() as tmp_dir, cwd(os.path.join(fixtures, "complete")):
+        dirname = api.prepare_metadata_for_build_wheel(tmp_dir)
+
+        assert "my_package-1.2.3.dist-info" == dirname
+
+        dist_info = Path(tmp_dir, dirname)
+
+        assert (dist_info / "entry_points.txt").exists()
+        assert (dist_info / "WHEEL").exists()
+        assert (dist_info / "METADATA").exists()
+
+        with (dist_info / "entry_points.txt").open() as f:
+            assert entry_points == decode(f.read())
+
+        with (dist_info / "WHEEL").open() as f:
+            assert wheel_data == decode(f.read())
+
+        with (dist_info / "METADATA").open() as f:
+            assert metadata == decode(f.read())