[Maint] use setuptools_scm for versioning (#159)

* use setuptools_scm for versioning

* ensure checkout depth is correctly set

* remove problematic [tool.setuptools.dynamic]

.github/workflows/build_napari.yml

@@ -17,6 +17,9 @@ jobs:
     steps:
       - name: Clone napari-sphinx-theme
         uses: actions/checkout@v4
+        with:
+          # ensure version metadata is proper
+          fetch-depth: 0
 
       - name: Clone napari docs repo
         uses: actions/checkout@v4

.github/workflows/deploy.yml

@@ -25,6 +25,8 @@ jobs:
         python-version: [3.9]
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5

napari_sphinx_theme/__init__.py

@@ -3,8 +3,10 @@
 
 from .napari_code_theme import *
 
-__version__ = "0.3.3.dev0"
-
+try:
+    from ._version import version as __version__
+except ImportError:
+    __version__ = 'not-installed'
 
 def update_templates(app, pagename, templatename, context, doctree):
     """Update template names for page build."""

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=61.0"]
+requires = ["setuptools>=64", "setuptools_scm>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -49,8 +49,8 @@ repository = "https://github.com/napari/napari-sphinx-theme"
 packages = ["napari_sphinx_theme"]
 zip-safe = false
 
-[tool.setuptools.dynamic]
-version = {attr = "napari_sphinx_theme.__version__"}
+[tool.setuptools_scm]
+version_file = "napari_sphinx_theme/_version.py"
 
 [tool.setuptools.package-data]
 napari_sphinx_theme = [