Add support for setup.py as an export format

docs/docs/cli.md

@@ -433,7 +433,7 @@ poetry export -f requirements.txt > requirements.txt
 
 !!!note
 
-    Only the `requirements.txt` format is currently supported.
+    Only the `requirements.txt` and `setup.py` format is currently supported.
 
 ### Options
 

poetry/console/commands/export.py

@@ -13,16 +13,22 @@ class ExportCommand(Command):
     options = [
         option("format", "f", "Format to export to.", flag=False),
         option("output", "o", "The name of the output file.", flag=False),
-        option("without-hashes", None, "Exclude hashes from the exported file."),
-        option("dev", None, "Include development dependencies."),
+        option(
+            "without-hashes", None, "Exclude hashes from the exported file if used."
+        ),
+        option("dev", None, "Include development dependencies if configurable."),
         option(
             "extras",
             "E",
-            "Extra sets of dependencies to include.",
+            "Extra sets of dependencies to include if configurable.",
             flag=False,
             multiple=True,
         ),
-        option("with-credentials", None, "Include credentials for extra indices."),
+        option(
+            "with-credentials",
+            None,
+            "Include credentials for extra indices if format supports indices.",
+        ),
     ]
 
     def handle(self):

poetry/utils/exporter.py

@@ -1,22 +1,26 @@
+from typing import Any
 from typing import Union
 
 from clikit.api.io import IO
 
+from poetry.io.null_io import NullIO
+from poetry.masonry.builders import SdistBuilder
 from poetry.packages.directory_dependency import DirectoryDependency
 from poetry.packages.file_dependency import FileDependency
 from poetry.packages.url_dependency import URLDependency
 from poetry.packages.vcs_dependency import VCSDependency
 from poetry.poetry import Poetry
 from poetry.utils._compat import Path
 from poetry.utils._compat import decode
+from poetry.utils.env import NullEnv
 
 
 class Exporter(object):
     """
     Exporter class to export a lock file to alternative formats.
     """
 
-    ACCEPTED_FORMATS = ("requirements.txt",)
+    ACCEPTED_FORMATS = ("requirements.txt", "setup.py")
     ALLOWED_HASH_ALGORITHMS = ("sha256", "sha384", "sha512")
 
     def __init__(self, poetry):  # type: (Poetry) -> None
@@ -163,6 +167,13 @@ def _export_requirements_txt(
 
         self._output(content, cwd, output)
 
+    def _export_setup_py(
+        self, cwd, output, *_, **__
+    ):  # type: (Path, Union[IO, str], Any, Any) -> None
+        builder = SdistBuilder(self._poetry, NullEnv(), NullIO())
+        content = decode(builder.build_setup())
+        self._output(content, cwd, output)
+
     def _output(
         self, content, cwd, output
     ):  # type: (str, Path, Union[IO, str]) -> None

tests/utils/test_exporter.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 import sys
 
 import pytest
@@ -6,7 +7,7 @@
 from poetry.poetry import Poetry
 from poetry.repositories.auth import Auth
 from poetry.repositories.legacy_repository import LegacyRepository
-from poetry.utils._compat import Path
+from poetry.utils._compat import Path, encode, decode
 from poetry.utils.exporter import Exporter
 
 
@@ -40,7 +41,7 @@ def locker():
 
 @pytest.fixture
 def poetry(fixture_dir, locker):
-    p = Poetry.create(fixture_dir("sample_project"))
+    p = Poetry.create(fixture_dir("simple_project"))
     p._locker = locker
 
     return p
@@ -799,3 +800,45 @@ def test_exporter_exports_requirements_txt_to_standard_output(tmp_dir, poetry, c
 """
 
     assert out == expected
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 4), reason="python2.7 fails due to unicode issues"
+)
+def test_exporter_can_export_setup_py_with_standard_packages(tmp_dir, poetry):
+    exporter = Exporter(poetry)
+
+    exporter.export("setup.py", Path(tmp_dir), "setup.py")
+
+    with (Path(tmp_dir) / "setup.py").open(encoding="utf-8") as f:
+        content = f.read()
+
+    expected = """# -*- coding: utf-8 -*-
+from distutils.core import setup
+
+packages = \\
+['simple_project']
+
+package_data = \\
+{'': ['*']}
+
+setup_kwargs = {
+    'name': 'simple-project',
+    'version': '1.2.3',
+    'description': 'Some description.',
+    'long_description': 'My Package\\n==========\\n',
+    'author': 'Sébastien Eustace',
+    'author_email': 'sebastien@eustace.io',
+    'maintainer': None,
+    'maintainer_email': None,
+    'url': 'https://poetry.eustace.io',
+    'packages': packages,
+    'package_data': package_data,
+    'python_requires': '>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
+}
+
+
+setup(**setup_kwargs)
+"""
+
+    assert expected == content