Add DIRHTML builder support

docs/src/about.rst

@@ -16,8 +16,8 @@ is injected after the ordinary Sphinx build is finished.
 
 Caveats
 -------
-- **Only works with HTML documentation**, disabled otherwise. If the extension
-  is off, it silently removes directives that would produce output.
+- **Only works with HTML or DIRHTML documentation**, disabled otherwise. If the
+  extension is off, it silently removes directives that would produce output.
 - **Only processes blocks, not inline code**. Sphinx has great tools
   for linking definitions inline, and longer code should be in a block anyway.
 - **Doesn't run example code**. Therefore all possible resolvable types are not

docs/src/index.rst

@@ -68,7 +68,7 @@ Caveats
 -------
 For a more thorough explanation, see :ref:`about`.
 
-- Only works with HTML documentation
+- Only works with HTML or DIRHTML documentation
 - Only processes blocks, not inline code
 - Doesn't run example code
 - Parsing and type hint resolving is incomplete

docs/src/release_notes.rst

@@ -8,6 +8,10 @@ These release notes are based on
 sphinx-codeautolink adheres to
 `Semantic Versioning <https://semver.org>`_.
 
+Unreleased
+----------
+- Add support for the DIRHTML Sphinx builder (:issue:`188`)
+
 0.17.2 (2025-03-02)
 -------------------
 - Support :rst:dir:`testsetup` from ``sphinx.ext.doctest`` as another

src/sphinx_codeautolink/extension/__init__.py

@@ -89,7 +89,7 @@ def __init__(self) -> None:
     @print_exceptions()
     def build_inited(self, app) -> None:
         """Handle initial setup."""
-        if app.builder.name != "html":
+        if app.builder.name not in ("html", "dirhtml"):
             self.do_nothing = True
             return
 
@@ -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)
@@ -289,6 +290,7 @@ def apply_links(self, app, exception) -> None:
                 self.inventory,
                 self.custom_blocks,
                 self.search_css_classes,
+                builder_name=app.builder.name,
             )
 
         self.cache.write()

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)))

src/sphinx_codeautolink/extension/block.py

@@ -375,9 +375,14 @@ def link_html(
     inventory: dict,
     custom_blocks: dict,
     search_css_classes: list,
+    builder_name: str = "html",
 ) -> None:
     """Inject links to code blocks on disk."""
-    html_file = Path(out_dir) / (document + ".html")
+    if builder_name == "dirhtml" and Path(document).name != "index":
+        html_file = Path(out_dir) / document / "index.html"
+    else:
+        html_file = Path(out_dir) / (document + ".html")
+
     text = html_file.read_text("utf-8")
     soup = BeautifulSoup(text, "html.parser")
 

tests/extension/__init__.py

@@ -278,6 +278,7 @@ def test_parallel_build(tmp_path: Path):
 
     for file in subfiles:
         assert_links(result_dir / (file + ".html"), links)
+
     assert check_link_targets(result_dir) == n_subfiles * len(links)
 
 
@@ -312,14 +313,70 @@ def test_skip_identical_code(tmp_path: Path):
     assert "sphinx-codeautolink-a" in str(blocks[1])
 
 
+def test_dirhtml_builder(tmp_path: Path):
+    index = """
+Test project
+============
+
+.. toctree::
+   :maxdepth: 2
+
+   page1/index
+   page2
+   subdir/page3
+
+Index Page Code
+---------------
+
+.. code:: python
+
+   import test_project
+   test_project.bar()
+
+.. automodule:: test_project
+"""
+
+    page = """
+Page {idx}
+===========
+
+.. code:: python
+
+   import test_project
+   test_project.bar()
+
+.. autolink-examples:: test_project.bar
+"""
+
+    files = {
+        "conf.py": default_conf,
+        "index.rst": index,
+        "page1/index.rst": page.format(idx=1),
+        "page2.rst": page.format(idx=2),
+        "subdir/page3.rst": page.format(idx=3),
+    }
+    links = ["test_project", "test_project.bar"]
+
+    result_dir = _sphinx_build(tmp_path, "dirhtml", files)
+
+    assert_links(result_dir / "index.html", links)
+    assert_links(result_dir / "page1/index.html", links)
+    assert_links(result_dir / "page2/index.html", links)
+    assert_links(result_dir / "subdir/page3/index.html", links)
+
+    assert check_link_targets(result_dir) == len(links) * 4
+
+
 def _sphinx_build(
     folder: Path, builder: str, files: dict[str, str], n_processes: int | None = None
 ) -> Path:
     """Build Sphinx documentation and return result folder."""
     src_dir = folder / "src"
     src_dir.mkdir(exist_ok=True)
     for name, content in files.items():
-        (src_dir / name).write_text(content, "utf-8")
+        path = src_dir / name
+        path.parent.mkdir(exist_ok=True, parents=True)
+        path.write_text(content, "utf-8")
 
     build_dir = folder / "build"
     args = ["-M", builder, str(src_dir), str(build_dir), "-W"]

tests/extension/_check.py

@@ -12,7 +12,7 @@
 def check_link_targets(root: Path) -> int:
     """Validate links in HTML site at root, return number of links found."""
     site_docs = {
-        p.relative_to(root): BeautifulSoup(p.read_text("utf-8"), "html.parser")
+        p: BeautifulSoup(p.read_text("utf-8"), "html.parser")
         for p in root.glob("**/*.html")
     }
     site_ids = {k: gather_ids(v) for k, v in site_docs.items()}
@@ -27,10 +27,18 @@ def check_link_targets(root: Path) -> int:
                     external_site_ids[base] = gather_ids(sub_soup)
                 ids = external_site_ids[base]
             else:
-                ids = site_ids[Path(base)]
+                target_path = (doc.parent / base).resolve()
+                if target_path.is_dir():
+                    target_path /= "index.html"
+                assert target_path.exists(), (
+                    f"Target path {target_path!s} not found while validating"
+                    f" link for `{link.string}` in {doc.relative_to(root)!s}!"
+                )
+                ids = site_ids[target_path]
+
             assert id_ in ids, (
-                f"ID {id_} not found in {base}"
-                f" while validating link for `{link.string}` in {doc!s}!"
+                f"ID {id_} not found in {base} while validating link"
+                f" for `{link.string}` in {doc.relative_to(root)!s}!"
             )
             total += 1
     return total