add datastar and render shim

repub/pages/shim.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+import htpy as h
+from htpy import Node, Renderable
+
+ON_LOAD_JS = (
+    "@post(window.location.pathname + "
+    "(window.location.search + '&u=').replace(/^&/,'?'), "
+    "{retryMaxCount: Infinity})"
+)
+
+TAB_ID_JS = "self.crypto.randomUUID().substring(0,8)"
+
+
+def shim_page(*, datastar_src: str, head: Node | None = None) -> Renderable:
+    return h.html(lang="en")[
+        h.head[
+            h.meta(charset="UTF-8"),
+            head,
+            h.script(id="js", defer=True, type="module", src=datastar_src),
+            h.meta(name="viewport", content="width=device-width, initial-scale=1.0"),
+        ],
+        h.body[
+            h.div({"data-signals:tabid": TAB_ID_JS}),
+            h.div(
+                {
+                    "data-init": ON_LOAD_JS,
+                    "data-on:online__window": ON_LOAD_JS,
+                }
+            ),
+            h.noscript["Your browser does not support JavaScript!"],
+            h.main(id="morph"),
+        ],
+    ]