fix pypa#840 - return to setuptools

CHANGELOG.rst

@@ -8,7 +8,6 @@ breaking
 * turn Configuration into a dataclass
 * require configuration to always pass into helpers
 * hide file-finders implementation in private module
-* migrate to hatchling
 * renamed setuptools_scm.hacks to setuptools_scm.fallbacks and drop support for pip-egg-info
 * remove trace function and use logging instead
 * unify distance=None and distance=0 they should mean the same

_own_version_helper.py

@@ -1,12 +1,17 @@
 """
 this module is a hack only in place to allow for setuptools
 to use the attribute for the versions
+
+it works only if the backend-path of the build-system section
+from pyproject.toml is respected
 """
 from __future__ import annotations
 
 import logging
 from typing import Callable
 
+from setuptools.build_meta import *  # noqa
+
 from setuptools_scm import _types as _t
 from setuptools_scm import Configuration
 from setuptools_scm import get_version
@@ -48,3 +53,14 @@ def scm_version() -> str:
         version_scheme=guess_next_dev_version,
         local_scheme=get_local_node_and_date,
     )
+
+
+version: str
+
+
+def __getattr__(name: str) -> str:
+    if name == "version":
+        global version
+        version = scm_version()
+        return version
+    raise AttributeError(name)

pyproject.toml

@@ -1,15 +1,19 @@
 
 
 [build-system]
-build-backend = "hatchling.build"
+build-backend = "_own_version_helper"
 requires = [
-  "hatchling>=1.10",
   'importlib-metadata>=4.6; python_version < "3.10"',
   "packaging>=20",
-  "setuptools>=55",
+  "rich",
+  "setuptools>=61",
   'tomli; python_version < "3.11"',
   'typing_extensions; python_version < "3.8"',
 ]
+backend-path = [
+  ".",
+  "src",
+]
 
 [project]
 name = "setuptools-scm"
@@ -94,8 +98,9 @@ PKG-INFO = "setuptools_scm.fallbacks:parse_pkginfo"
 "python-simplified-semver" = "setuptools_scm.version:simplified_semver_version"
 "release-branch-semver" = "setuptools_scm.version:release_branch_semver_version"
 
-[tool.hatch.version]
-source = "code"
-path = "_own_version_helper.py"
-search-paths = ["src"]
-expression = "scm_version()"
+[tool.setuptools.packages.find]
+where = ["src"]
+namespaces = false
+
+[tool.setuptools.dynamic]
+version = { attr = "_own_version_helper.version"}