DOC: Update conf.py

Trying out some code to put the correct version information in the RTD PDFs

docs/source/conf.py

@@ -74,19 +74,33 @@
 
 # General information about the project.
 project = 'ANTsPy'
-copyright = '2017, ANTs Contributors'
+copyright = '2017-2024, ANTs Contributors'
 author = 'ANTs Contributors'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# The short X.Y version.
-# TODO: change to [:2] at v1.0
-version = 'master (0.1.3)'
-# The full version, including alpha/beta/rc tags.
-# TODO: verify this works as expected
-release = 'master'
+# Default values for local builds
+version = 'local'
+release = 'local'
+
+# Determine if we are on Read the Docs
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+
+if on_rtd:
+    rtd_version = os.environ.get('READTHEDOCS_VERSION', 'local')
+    rtd_version_type = os.environ.get('READTHEDOCS_VERSION_TYPE', 'branch')
+
+    if rtd_version_type == 'tag':
+        version = rtd_version.lstrip('v')
+        release = f'release {version}'
+    elif rtd_version_type == 'branch' and rtd_version == 'latest':
+        version = 'dev'
+        release = f'dev ({rtd_version})'
+    else:
+        version = rtd_version
+        release = rtd_version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.