feat: Support literalinclude (linenos)

docs/index.rst

@@ -27,12 +27,9 @@ Basic usage
 When you set extension into your ``conf.py`` of documentation,
 builder changes behaviors of code highlightings.
 
-.. code:: python
-
-   # Your conf.py
-   extensions = [
-       "atsphinx.highlightjs",
-   ]
+.. literalinclude:: conf.py
+   :emphasize-lines: 11-13
+   :language: python
 
 Please see HTML source, this includes only ``<pre><code>`` element only
 (if using Pygments, it renders parts of contents).

src/atsphinx/highlightjs/__init__.py

@@ -26,11 +26,19 @@ def register_highlightjs(app: Sphinx):
 
 def visit_literal_block(self: SphinxTranslator, node: nodes.literal_block):
     lang = node["language"]
-    self.body.append(f'<pre><code class="language-{lang}">')
+    code = node.rawsource
+    if "hl_lines" in node["highlight_args"]:
+        splitted = node.rawsource.split("\n")
+        code = "\n".join(
+            splitted[line-1]
+            for line in node["highlight_args"]["hl_lines"]
+        )
+    self.body.append(f'<pre><code class="language-{lang}">{code}</code></pre>')
+    raise nodes.SkipNode
 
 
 def depart_literal_block(self: SphinxTranslator, node: nodes.literal_block):
-    self.body.append("</code></pre>")
+    pass
 
 
 def setup(app: Sphinx):  # noqa: D103