Configure setuptools-scm for version management

- Add setuptools-scm>=8 to build-system requires
- Add [tool.setuptools_scm] with version_file
- Replace hardcoded __version__ with import from generated _version.py
- Remove version from [tool.setuptools.dynamic] (scm provides it)
- Remove MANIFEST.in (setuptools-scm auto-includes git-tracked files)
- Add unittest2pytest/_version.py to .gitignore

Author: graingert

.gitignore

@@ -62,3 +62,4 @@ Icon?
 Thumbs.db
 *.pid
 ._.**~
+unittest2pytest/_version.py

MANIFEST.in

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=77"]
+requires = ["setuptools>=77", "setuptools-scm>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -43,10 +43,11 @@ include-package-data = false
 
 [tool.setuptools.dynamic]
 readme = {file = ["README.rst", "NEWLINE.rst", "CHANGELOG.rst"], content-type = "text/x-rst"}
-version = {attr = "unittest2pytest.__version__"}
+
+[tool.setuptools_scm]
+version_file = "unittest2pytest/_version.py"
 
 [tool.zest-releaser]
-python-file-with-version = "unittest2pytest/__init__.py"
 push-changes = false
 tag-format = "v{version}"
 tag-message = "unittest2pytest {version}"

pyproject.toml

@@ -23,4 +23,8 @@
 
 
 __title__ = 'unittest2pytest'
-__version__ = '0.6.dev0'
+
+try:
+    from ._version import version as __version__
+except ImportError:
+    __version__ = "0.0.0.dev0+unknown"