feat: Add support for refer to PyPI packages

functests/roots/test-default/index.rst

@@ -6,3 +6,4 @@ Using node modules
 ==================
 
 * :npm:`react`
+* :pypi:`sphinx-revealjs`

functests/test_sphinx.py

@@ -10,3 +10,4 @@ def test_work_on_sphinx(app: SphinxTestApp):
     index_html = app.outdir / "index.html"
     assert index_html.exists()
     assert "https://www.npmjs.com/package/react" in index_html.read_text()
+    assert "https://pypi.org/project/sphinx-revealjs" in index_html.read_text()

src/rst_multi_refs/registry/pypi.py

@@ -0,0 +1,26 @@
+"""PyPI registry refecence module."""
+from typing import List, Optional
+
+from docutils import nodes
+from docutils.parsers.rst import roles
+from docutils.parsers.rst.states import Inliner
+
+
+def reference_role(
+    role: str,
+    rawtext: str,
+    text: str,
+    lineno: int,
+    inliner: Inliner,
+    options: Optional[dict] = None,
+    content: Optional[List[str]] = None,
+):
+    """Parser."""
+    options = roles.normalized_role_options(options)
+    messages = []
+    url = f"https://pypi.org/project/{text}"
+    return [nodes.reference(rawtext, text, refuri=url, **options)], messages
+
+
+def setup():  # noqa: D103
+    roles.register_canonical_role("pypi", reference_role)