feat: add interactive homepage layout lab

exampleSite/assets/js/home.js

@@ -26,6 +26,32 @@ window.addEventListener("DOMContentLoaded", (event) => {
   );
 });
 
+function initLayoutLab() {
+  const lab = document.querySelector("[data-layout-lab]");
+  if (!lab) return;
+
+  const buttons = lab.querySelectorAll("[data-layout-preview-button]");
+  const panels = lab.querySelectorAll("[data-layout-preview-panel]");
+  const activate = (layout) => {
+    buttons.forEach((button) => {
+      const active = button.dataset.layoutPreviewButton === layout;
+      button.setAttribute("aria-selected", String(active));
+      button.classList.toggle("bg-primary-600", active);
+      button.classList.toggle("text-white", active);
+      button.classList.toggle("dark:border-primary-600", active);
+    });
+    panels.forEach((panel) => {
+      panel.hidden = panel.dataset.layoutPreviewPanel !== layout;
+    });
+  };
+
+  buttons.forEach((button) => {
+    button.addEventListener("click", () => activate(button.dataset.layoutPreviewButton));
+  });
+}
+
+window.addEventListener("DOMContentLoaded", initLayoutLab);
+
 var list_config = ["CardViewProse", "CardViewScreenWidth", "NormalView"];
 
 var titles = {

exampleSite/content/layout-lab/_index.md

@@ -0,0 +1,13 @@
+---
+title: "Homepage layout lab"
+description: "Try Blowfish's built-in homepage layouts without changing your site configuration."
+type: "layout-lab"
+---
+
+{{< lead >}}
+Choose a layout below to preview how the same content behaves across Blowfish's built-in homepage patterns.
+{{< /lead >}}
+
+{{< alert "circle-info" >}}
+This is an example-site playground. Your own site selects a homepage layout with `homepage.layout` in `params.toml`.
+{{< /alert >}}

exampleSite/layouts/layout-lab/list.html

@@ -0,0 +1,33 @@
+{{ define "main" }}
+  {{ $jsHome := resources.Get "js/home.js" | resources.Minify | resources.Fingerprint (.Site.Params.fingerprintAlgorithm | default "sha512") }}
+  <section class="mx-auto max-w-4xl py-10 text-center">
+    <p class="text-sm font-bold uppercase tracking-[0.18em] text-primary-600 dark:text-primary-400">Interactive preview</p>
+    <h1 class="mt-2 text-4xl font-black tracking-tight text-neutral-950 dark:text-white">{{ .Title }}</h1>
+    <div class="prose mx-auto mt-5 dark:prose-invert">{{ .Content }}</div>
+  </section>
+
+  <section data-layout-lab class="mb-14">
+    <div class="not-prose mb-8 flex flex-wrap justify-center gap-2" role="tablist" aria-label="Homepage layouts">
+      {{ range $index, $layout := slice "landing" "background" "hero" "profile" "page" "card" }}
+        <button
+          type="button"
+          class="rounded-full border border-neutral-300 px-4 py-2 text-sm font-bold text-neutral-700 transition hover:border-primary-400 hover:text-primary-600 dark:border-neutral-700 dark:text-neutral-200 dark:hover:text-primary-400 {{ if eq $index 0 }}bg-primary-600 text-white hover:bg-primary-500 hover:text-white dark:border-primary-600{{ end }}"
+          data-layout-preview-button="{{ $layout }}"
+          role="tab"
+          aria-selected="{{ cond (eq $index 0) `true` `false` }}">
+          {{ $layout | title }}
+        </button>
+      {{ end }}
+    </div>
+
+    <div class="rounded-3xl border border-neutral-200 bg-neutral/40 p-4 shadow-sm dark:border-neutral-800 dark:bg-neutral-900/30 sm:p-8">
+      {{ range $index, $layout := slice "landing" "background" "hero" "profile" "page" "card" }}
+        <div data-layout-preview-panel="{{ $layout }}" role="tabpanel"{{ if ne $index 0 }} hidden{{ end }}>
+          {{ partial (printf "home/%s.html" $layout) $ }}
+        </div>
+      {{ end }}
+    </div>
+  </section>
+
+  <script defer type="text/javascript" src="{{ $jsHome.RelPermalink }}" integrity="{{ $jsHome.Data.Integrity }}"></script>
+{{ end }}