Remove remnants of setuptools

We also move stuff around pyproject.toml to keep related things together
and allow users to use the package without installing it or having
setuptools_scm installed..

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

.github/workflows/test.yml

@@ -32,8 +32,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
-          python -m pip install --upgrade setuptools wheel setuptools_scm
+          python -m pip install --upgrade pip wheel
           python -m pip install sphinx
           python -m pip install ".[test,twisted,dev]"
 

pyproject.toml

@@ -1,18 +1,5 @@
-[tool.mypy]
-warn_redundant_casts = true
-warn_unused_configs = true
-check_untyped_defs = true
-
-[[tool.mypy.overrides]]
-module = [
-    "fixtures.*",
-    "testresources.*",
-    "testscenarios.*",
-]
-ignore_missing_imports = true
-
 [build-system]
-requires = ["setuptools>=61", "hatchling", "hatch_vcs"]
+requires = ["hatchling", "hatch_vcs"]
 build-backend = "hatchling.build"
 
 [project]
@@ -38,22 +25,16 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: Software Development :: Testing",
 ]
-dependencies = ["setuptools; python_version>='3.12'"]
 dynamic = ["version"]
 requires-python = ">=3.9"
 
 [project.urls]
 Homepage = "https://github.com/testing-cabal/testtools"
 
-[tool.setuptools]
-include-package-data = false
-
-[tool.setuptools.packages.find]
-include = ["testtools*"]
-exclude = ["man*"]
-
-[tool.files]
-packages = "testtools"
+[project.optional-dependencies]
+test = ["testscenarios", "testresources"]
+twisted = ["Twisted", "fixtures"]
+dev = ["ruff==0.11.2"]
 
 [tool.hatch.version]
 source = "vcs"
@@ -67,7 +48,15 @@ version = {version!r}
 __version__ = {version_tuple!r}
 """
 
-[project.optional-dependencies]
-test = ["testscenarios", "testresources"]
-twisted = ["Twisted", "fixtures"]
-dev = ["ruff==0.11.2"]
+[tool.mypy]
+warn_redundant_casts = true
+warn_unused_configs = true
+check_untyped_defs = true
+
+[[tool.mypy.overrides]]
+module = [
+    "fixtures.*",
+    "testresources.*",
+    "testscenarios.*",
+]
+ignore_missing_imports = true

setup.py

@@ -96,6 +96,32 @@
     iterate_tests,
 )
 
+
+def __get_git_version():
+    import os
+    import subprocess
+
+    cwd = os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir)
+
+    try:
+        out = subprocess.check_output(
+            ["git", "describe"], stderr=subprocess.STDOUT, cwd=cwd
+        )
+    except (OSError, subprocess.CalledProcessError):
+        return None
+
+    try:
+        version = out.strip().decode("utf-8")
+    except UnicodeDecodeError:
+        return None
+
+    if "-" in version:  # after tag
+        # convert version-N-githash to version.postN+githash
+        return version.replace("-", ".post", 1).replace("-g", "+git", 1)
+    else:
+        return version
+
+
 # same format as sys.version_info: "A tuple containing the five components of
 # the version number: major, minor, micro, releaselevel, and serial. All
 # values except releaselevel are integers; the release level is 'alpha',
@@ -109,21 +135,13 @@
 # Otherwise it is major.minor.micro~$(revno).
 
 try:
-    # If setuptools_scm is installed (e.g. in a development environment with
-    # an editable install), then use it to determine the version dynamically.
-    from setuptools_scm import get_version
-
-    # This will fail with LookupError if the package is not installed in
-    # editable mode or if Git is not installed.
-    version = get_version(root="..", relative_to=__file__)
-    __version__ = tuple([int(v) if v.isdigit() else v for v in version.split(".")])
-except (ImportError, LookupError):
-    # As a fallback, use the version that is hard-coded in the file.
-    try:
-        from ._version import __version__, version
-    except ModuleNotFoundError:
-        # The user is probably trying to run this without having installed
-        # the package, so complain.
-        raise RuntimeError(
-            "Testtools is not correctly installed. Please install it with pip."
-        )
+    from ._version import __version__, version
+except ModuleNotFoundError:
+    # package is not installed
+    if version := __get_git_version():
+        # we're in a git repo
+        __version__ = tuple([int(v) if v.isdigit() else v for v in version.split(".")])
+    else:
+        # we're working with a tarball or similar
+        version = "0.0.0"
+        __version__ = (0, 0, 0)