docs: allow building without polyversion

Author: vpratz

docsrc/pre-build.py

@@ -2,7 +2,13 @@
 import shutil
 import sys
 from pathlib import Path
-from sphinx_polyversion.git import Git
+
+try:
+    from sphinx_polyversion.git import Git
+
+    USE_POLYVERSION = True
+except ImportError:
+    USE_POLYVERSION = False
 
 
 def copy_files(sourcedir):
@@ -34,8 +40,13 @@ def copy_files(sourcedir):
 
 
 def patch_conf(sourcedir):
-    root = Git.root(Path(__file__).parent)
+    if USE_POLYVERSION:
+        root = Git.root(Path(__file__).parent)
+    else:
+        root = str(Path(sourcedir).parent.parent)
     cursrc = os.path.join(root, "docsrc", "source")
+    if os.path.abspath(cursrc) == os.path.abspath(sourcedir):
+        return
     # copy the configuration file: shared for all versions
     conf_src = os.path.join(cursrc, "conf.py")
     conf_dst = os.path.join(sourcedir, "conf.py")

docsrc/source/conf.py

@@ -11,8 +11,16 @@
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 import os
 import sys
-from sphinx_polyversion import load
-from sphinx_polyversion.git import GitRef
+
+try:
+    from sphinx_polyversion import load
+    from sphinx_polyversion.git import GitRef
+    from sphinx_polyversion.api import LoadError
+
+    USE_POLYVERSION = True
+except ImportError:
+    USE_POLYVERSION = False
+    print("sphinx_polyversion not installed, building single version")
 
 sys.path.insert(0, os.path.abspath("../.."))
 
@@ -134,5 +142,9 @@
 autosummmary_generate = True
 
 # versioning data for template
-data = load(globals())
-current: GitRef = data["current"]
+if USE_POLYVERSION:
+    try:
+        data = load(globals())
+        current: GitRef = data["current"]
+    except LoadError:
+        print("sphinx_polyversion could not load. Building single version")