initial COmmit: Add KB Antora Importer plugin files

kb-antora-importer/templates/page.php

@@ -0,0 +1,56 @@
+<?php
+defined('ABSPATH') || exit;
+
+$render_nav = static function (array $nodes) use (&$render_nav, $base_slug, $product_slug, $version_slug): void {
+    if (! $nodes) {
+        return;
+    }
+
+    echo '<ul>';
+    foreach ($nodes as $node) {
+        $target = (string) ($node['target'] ?? '');
+        $label = (string) ($node['title'] ?? '');
+        $href = '';
+
+        if ($target) {
+            $slug = preg_replace('/\.adoc(#.+)?$/', '', basename($target)) ?: basename($target);
+            $slug = 'index' === $slug ? '' : sanitize_title($slug);
+            $href = $url_builder::page($product_slug, $version_slug, $slug);
+        }
+
+        echo '<li>';
+        if ($href) {
+            printf('<a href="%s">%s</a>', esc_url($href), esc_html($label));
+        } else {
+            echo '<span>' . esc_html($label) . '</span>';
+        }
+        $render_nav((array) ($node['children'] ?? []));
+        echo '</li>';
+    }
+    echo '</ul>';
+};
+?>
+<main class="kb-docs-wrap kb-doc-layout">
+    <aside class="kb-sidebar">
+        <label class="screen-reader-text" for="kb-version-switcher"><?php esc_html_e('Version', 'kb-antora-importer'); ?></label>
+        <select id="kb-version-switcher">
+            <?php foreach ((array) $versions as $item) : ?>
+                <option value="<?php echo esc_attr($item->slug); ?>" data-url="<?php echo esc_url($url_builder::version($product_slug, $item->slug)); ?>" <?php selected($item->slug, $version_slug); ?>><?php echo esc_html($item->name); ?></option>
+            <?php endforeach; ?>
+        </select>
+        <nav class="kb-sidebar-nav" aria-label="<?php esc_attr_e('Documentation navigation', 'kb-antora-importer'); ?>">
+            <?php $render_nav((array) $nav_tree); ?>
+        </nav>
+    </aside>
+    <article class="kb-doc-content">
+        <nav class="kb-breadcrumbs">
+            <a href="<?php echo esc_url($url_builder::docsIndex()); ?>"><?php esc_html_e('Docs', 'kb-antora-importer'); ?></a><span>/</span>
+            <a href="<?php echo esc_url($url_builder::product($product_slug)); ?>"><?php echo esc_html($product ? $product->name : $product_slug); ?></a><span>/</span>
+            <a href="<?php echo esc_url($url_builder::version($product_slug, $version_slug)); ?>"><?php echo esc_html($version ? $version->name : $version_slug); ?></a>
+        </nav>
+        <h1><?php echo esc_html(get_the_title($post)); ?></h1>
+        <div class="kb-rendered-content">
+            <?php echo wp_kses_post($url_builder::rewriteHtml(apply_filters('the_content', $post->post_content))); ?>
+        </div>
+    </article>
+</main>