Fix references when using DIRHTML builder

Author: sitic

src/sphinx_codeautolink/extension/__init__.py

@@ -268,6 +268,7 @@ def generate_backref_tables(self, app, doctree, docname):
         visitor = CodeRefsVisitor(
             doctree,
             code_refs=self.code_refs,
+            builder=app.builder.name,
             warn_no_backreference=self.warn_no_backreference,
         )
         doctree.walk(visitor)

src/sphinx_codeautolink/extension/backref.py

@@ -1,6 +1,7 @@
 """Backreference tables implementation."""
 
 from dataclasses import dataclass
+from pathlib import Path
 
 from docutils import nodes
 
@@ -62,11 +63,13 @@ def __init__(
         self,
         *args,
         code_refs: dict[str, list[CodeExample]],
+        builder : str,
         warn_no_backreference: bool = False,
         **kwargs,
     ) -> None:
         super().__init__(*args, **kwargs)
         self.code_refs = code_refs
+        self.builder = builder
         self.warn_no_backreference = warn_no_backreference
 
     def unknown_departure(self, node) -> None:
@@ -79,7 +82,10 @@ def unknown_visit(self, node) -> None:
 
         items = []
         for ref in self.code_refs.get(node.ref, []):
-            link = ref.document + ".html"
+            if self.builder == "dirhtml" and Path(ref.document).name != "index":
+                link = ref.document + "/index.html"
+            else:
+                link = ref.document + ".html"
             if ref.ref_id is not None:
                 link += f"#{ref.ref_id}"
             items.append((link, " / ".join(ref.headings)))