Rename API and generalize router API

layouts/partials/head.html

@@ -66,9 +66,15 @@
   {{ $router := resources.Get "js/router.js" | resources.Fingerprint "md5" |
   resources.Minify }}
   <script type="module">
-    import { init } from '{{$router.Permalink}}';
+    import { attachSPARouting } from '{{$router.Permalink}}';
     // NOTE: everything within this callback will be executed for every page navigation. This is a good place to put JavaScript that loads or modifies data on the page.
-    init(() => {
+    const draw = () => {
+      const container = document.getElementById("graph-container")
+      // retry if the graph is not ready
+      if (!container) return requestAnimationFrame(draw)
+      // clear the graph in case there is anything within it
+      container.textContent = ""
+
       drawGraph(
         {{strings.TrimRight "/" .Page.Permalink}},
         {{strings.TrimRight "/" .Site.BaseURL}},
@@ -82,7 +88,8 @@
       {{if $.Site.Data.config.enableLinkPreview}}
         initPopover({{strings.TrimRight "/" .Site.BaseURL }})
       {{end}}
-    });
+    };
+    attachSPARouting(draw);
   </script>
   {{else}}
   <script>window.navigate = (url) => window.location.href = url</script>