Update version_selector.html

_includes/version_selector.html

@@ -1,28 +1,58 @@
-{% if page.version %}
-    {% assign current_version = page.version %}
-{% else %}
-    {% assign current_version = site.version %}
-{% endif %}
-
-{% assign current_version_label = site.versions[current_version] | default: 'undefined' %}
-
-{% if page.all_versions.size > 1 %}
-    <div class="alt-nav dropdown">
-        <span class="alt-nav__opener nav-link dropdown-toggle" id="versionDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-            <span class="alt-nav__opener-text">{{ current_version_label }}</span>
-            <i class="alt-nav__opener-icon icon-arrow-down"></i>
-        </span>
-        <span class="alt-nav__opener-label">Versions</span>
-        <ul class="alt-nav__drop dropdown-menu" aria-labelledby="versionDropdownMenuLink">
-            {% for version in page.all_versions %}
-                {% assign version_label = site.versions[version.version] | default: 'undefined' %}
-                <li><a href="{{ site.baseurl }}{{ version.url }}">{{ version_label }}</a></li>
-            {% endfor %}
-        </ul>
-    </div>
-    <div class="alt-nav__overlay"></div>
-{% else %}
-    <div class="alt-nav">
-        <span class="alt-nav__opener">This document has only one version {{ current_version_label }}</span>
-    </div>
-{% endif %}
+def setup_current_page_version(page, config)
+  return if config['page']['version']
+
+  page.url.match(%r{/(?<version>(\d+\.\d+|latest))/})
+  version = Regexp.last_match(:version)
+
+  config['page']['version'] = version
+end
+
+def setup_all_page_versions(page, config)
+  current_path = page.url
+  normalized_url = current_path.gsub(%r{/(?:\d+\.\d+|latest)/}, '/__VERSION__/')
+  url_pattern = Regexp.new("\\A" + Regexp.escape(normalized_url).gsub('__VERSION__', '(?:\\d+\\.\\d+|latest)') + "\\Z")
+
+  versioned_page_urls = page.site.pages.select do |site_page|
+    site_page.url.match(url_pattern)
+  end.map(&:url).uniq
+
+  versions = get_versions(versioned_page_urls, page.site.config['versions'])
+  config['page']['all_versions'] = versions.sort_by { |v| v['version'].to_s }.reverse
+end
+
+def get_versions(urls, defined_versions)
+  version_pattern = %r{/(?<page_version>(\d+\.\d+|latest))/}
+
+  urls.map do |url|
+    match = version_pattern.match(url)
+    version = match && match[:page_version]
+    next unless version && defined_versions.key?(version)
+
+    {
+      'version' => version,
+      'url' => url
+    }
+  end.compact
+end
+
+def can_be_versioned(page)
+  product = page['product']
+  role = page['role']
+  versioned_categories = page.site.config['versioned_categories']
+
+  return false if versioned_categories.dig(product, role).nil?
+
+  page.url.match(%r{\A/docs/#{product}/#{role}/(?<category>[\w-]+)/})
+  page_category = Regexp.last_match(:category)
+
+  versioned_categories[product][role].include?(page_category)
+end
+
+Jekyll::Hooks.register :pages, :pre_render do |page, config|
+  next page unless File.extname(page.path).match?(/md|html/)
+  next page unless page.url.start_with?('/docs/')
+  next page unless can_be_versioned(page)
+
+  setup_current_page_version(page, config)
+  setup_all_page_versions(page, config)
+end