Try to fix ReadTheDocs Sphinx build that is having problems getting t…

…he version from setuptools-scm (#1342)

.readthedocs.yaml

@@ -28,4 +28,7 @@ formats: all
 # See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
 python:
   install:
-    - requirements: docs/requirements.txt
+    - method: pip
+      path: .
+      extra_requirements:
+        - docs

docs/conf.py

@@ -19,6 +19,7 @@
 """
 
 import sys
+from importlib.metadata import version as get_version
 from os.path import abspath, dirname
 
 # Make sure we get the version of this copy of cmd2
@@ -27,8 +28,6 @@
 # Import for custom theme from Read the Docs
 import sphinx_rtd_theme
 
-import cmd2
-
 # -- General configuration -----------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
@@ -66,10 +65,10 @@
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# version will look like x.y.z
-version = cmd2.__version__
-# release will look like x.y
-release = '.'.join(version.split('.')[:2])
+# release will look like x.y.z
+release: str = get_version("cmd2")
+# for example take major/minor
+version: str = ".".join(release.split('.')[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

docs/requirements.txt

@@ -1,7 +1,7 @@
 
 pyperclip
 setuptools
-setuptools-scm<8
+setuptools-scm
 Sphinx
 sphinx-autobuild
 sphinx-rtd-theme

setup.py

@@ -77,6 +77,13 @@
         'ruff',
         'twine',
     ],
+    'docs': [
+        'setuptools',
+        'setuptools_scm',
+        'sphinx',
+        'sphinx-rtd-theme',
+        'sphinx-autobuild',
+    ],
     'validate': [
         'mypy',
         'ruff',