Make the editable builder execute build scripts if no setup.py generation (#2718)

poetry/masonry/builders/editable.py

@@ -43,16 +43,24 @@ class EditableBuilder(Builder):
         )
 
         if self._package.build_script:
+            if self._package.build_should_generate_setup():
                 self._debug(
                     "  - <warning>Falling back on using a <b>setup.py</b></warning>"
                 )
+
                 return self._setup_build()
 
+            self._run_build_script(self._package.build_script)
+
         added_files = []
         added_files += self._add_pth()
         added_files += self._add_scripts()
         self._add_dist_info(added_files)
 
+    def _run_build_script(self, build_script):
+        self._debug("  - Executing build script: <b>{}</b>".format(build_script))
+        self._env.run("python", str(self._path.joinpath(build_script)), call=True)
+
     def _setup_build(self):
         builder = SdistBuilder(self._poetry)
         setup = self._path / "setup.py"

tests/fixtures/extended_project_without_setup/README.rst

+My Package
+==========

tests/fixtures/extended_project_without_setup/pyproject.toml

+[tool.poetry]
+name = "extended-project"
+version = "1.2.3"
+description = "Some description."
+authors = [
+    "Sébastien Eustace <sebastien@eustace.io>"
+]
+license = "MIT"
+
+readme = "README.rst"
+
+homepage = "https://python-poetry.org"
+repository = "https://github.com/python-poetry/poetry"
+documentation = "https://python-poetry.org/docs"
+
+keywords = ["packaging", "dependency", "poetry"]
+
+classifiers = [
+    "Topic :: Software Development :: Build Tools",
+    "Topic :: Software Development :: Libraries :: Python Modules"
+]
+
+[tool.poetry.build]
+script = "build.py"
+generate-setup-file = false
+
+# Requirements
+[tool.poetry.dependencies]
+python = "~2.7 || ^3.4"
+
+[tool.poetry.scripts]
+foo = "foo:bar"

tests/masonry/builders/test_editable_builder.py

@@ -43,6 +43,17 @@ def extended_poetry():
 
 
 @pytest.fixture()
+def extended_without_setup_poetry():
+    poetry = Factory().create_poetry(
+        Path(__file__).parent.parent.parent
+        / "fixtures"
+        / "extended_project_without_setup"
+    )
+
+    return poetry
+
+
+@pytest.fixture()
 def env_manager(simple_poetry):
     return EnvManager(simple_poetry)
 
@@ -194,3 +205,14 @@ def test_builder_installs_proper_files_when_packages_configured(
 
     assert paths.issubset(expected)
     assert len(paths) == len(expected)
+
+
+def test_builder_should_execute_build_scripts(extended_without_setup_poetry):
+    env = MockEnv(path=Path("/foo"))
+    builder = EditableBuilder(extended_without_setup_poetry, env, NullIO())
+
+    builder.build()
+
+    assert [
+        ["python", str(extended_without_setup_poetry.file.parent / "build.py")]
+    ] == env.executed