Conditionalize pbori documentation

src/doc/en/reference/polynomial_rings/index.rst

@@ -65,9 +65,11 @@ Infinite Polynomial Rings
 Boolean Polynomials
 -------------------
 
-.. toctree::
-   :maxdepth: 1
+..only:: feature_sage_rings_polynomial_pbori
+
+   .. toctree::
+      :maxdepth: 1
 
-   sage/rings/polynomial/pbori/pbori
+      sage/rings/polynomial/pbori/pbori
 
-.. include:: ../footer.txt
+   .. include:: ../footer.txt

src/sage_docbuild/conf.py

@@ -33,6 +33,7 @@
 from sage.env import SAGE_DOC_SRC, SAGE_DOC, THEBE_DIR, PPLPY_DOCS, MATHJAX_DIR
 from sage.misc.latex_macros import sage_mathjax_macros
 from sage.features import PythonModule
+from sage.features.all import all_features
 
 # General configuration
 # ---------------------
@@ -940,3 +941,10 @@ def setup(app):
         app.connect('missing-reference', find_sage_dangling_links)
         app.connect('builder-inited', nitpick_patch_config)
         app.connect('html-page-context', add_page_context)
+
+
+# Conditional content
+# https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#tags
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#conf-tags
+for feature in all_features():
+    tags.add('feature_' + feature.name.replace('.', '_'))