No longer use Poetry as a build backend but poetry-core instead

docs/docs/pyproject.md

@@ -274,16 +274,22 @@ If you publish you package on PyPI, they will appear in the `Project Links` sect
 [PEP-517](https://www.python.org/dev/peps/pep-0517/) introduces a standard way
 to define alternative build systems to build a Python project.
 
-Poetry is compliant with PEP-517 so if you use Poetry to manage your Python
-project you should reference it in the `build-system` section of the `pyproject.toml`
-file like so:
+Poetry is compliant with PEP-517, by providing a lightweight core library,
+so if you use Poetry to manage your Python project you should reference
+it in the `build-system` section of the `pyproject.toml` file like so:
 
 ```toml
 [build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
+requires = ["poetry_core>=1.0.0"]
+build-backend = "poetry_core.masonry.api"
 ```
 
 !!!note
 
     When using the `new` or `init` command this section will be automatically added.
+
+
+!!!note
+
+    If your `pyproject.toml` file still references `poetry` directly as a build backend,
+    you should update it to reference `poetry_core` instead.

poetry/layouts/layout.py

@@ -38,7 +38,7 @@ def test_version():
 [tool.poetry.dev-dependencies]
 """
 
-BUILD_SYSTEM_MIN_VERSION = "0.12"
+BUILD_SYSTEM_MIN_VERSION = "1.0.0"
 BUILD_SYSTEM_MAX_VERSION = None
 
 
@@ -109,7 +109,7 @@ def generate_poetry_content(self):
         if BUILD_SYSTEM_MAX_VERSION is not None:
             build_system_version += ",<" + BUILD_SYSTEM_MAX_VERSION
 
-        build_system.add("requires", ["poetry" + build_system_version])
+        build_system.add("requires", ["poetry_core" + build_system_version])
         build_system.add("build-backend", "poetry.masonry.api")
 
         content.add("build-system", build_system)

pyproject.toml

@@ -75,11 +75,8 @@ poetry = "poetry.console:main"
 
 
 [build-system]
-requires = ["intreehooks"]
-build-backend = "intreehooks:loader"
-
-[tool.intreehooks]
-build-backend = "poetry.masonry.api"
+requires = ["poetry_core>=1.0.0a3"]
+build-backend = "poetry_core.masonry.api"
 
 
 [tool.isort]