Utilities/Sphinx: Add index entries for cross-references

Add a document transform to insert index and target nodes just before
any CMake domain cross-reference node.  This will make references to
CMake domain objects appear in the index.  Also add a comment explaining
why it cannot be done in a result_nodes method of the CMakeXRefRole.

1 files changed, 1 insertions, 1 deletions

diff --git a/Utilities/Sphinx/create_identifiers.py b/Utilities/Sphinx/create_identifiers.py
index 7715e534ae..3fe3fcbe52 100755
--- a/Utilities/Sphinx/create_identifiers.py
+++ b/Utilities/Sphinx/create_identifiers.py
@@ -34,7 +34,7 @@ for line in lines:
 
   for domain_object_string, domain_object_type in mapping:
     if "<keyword name=\"" + domain_object_string + "\"" in line:
-      if not "id=\"" in line:
+      if not "id=\"" in line and not "#index-" in line:
         prefix = "<keyword name=\"" + domain_object_string + "\" "
         part1, part2 = line.split(prefix)
         head, tail = part2.split("#" + domain_object_type + ":")