docs/rstjinja.py: add jinja processing for building latex (pdf) docs

docs/rstjinja.py

@@ -6,18 +6,28 @@ def rstjinja(app, docname, source):
     Render our pages as a jinja template for fancy templating goodness.
     """
     # Make sure we're outputting HTML
-    if app.builder.format != 'html':
+    if app.builder.format not in ("html", "latex"):
         return
 
     # we only want our one jinja template to run through this func
     if "shared-bindings/support_matrix" not in docname:
         return
 
-    src = source[0]
+    src = rendered = source[0]
     print(docname)
-    rendered = app.builder.templates.render_string(
-        src, app.config.html_context
-    )
+
+    if app.builder.format == "html":
+        rendered = app.builder.templates.render_string(
+            src, app.config.html_context
+        )
+    else:
+        from sphinx.util.template import BaseRenderer
+        renderer = BaseRenderer()
+        rendered = renderer.render_string(
+            src,
+            app.config.html_context
+        )
+
     source[0] = rendered
 
 def setup(app):