Add new version warning with link to docs v3

resources/asciidoctor/lib/chunker/extension.rb

@@ -9,6 +9,7 @@
 require_relative 'find_related'
 require_relative 'footnotes'
 require_relative 'nav'
+require_relative 'url_to_v3'
 
 ##
 # HTML5 converter that chunks like docbook.
@@ -49,6 +50,7 @@ def convert_document(doc)
       )
       doc.attributes['next_section'] = find_next_in doc, 0
       add_nav doc
+      add_url_to_v3 doc
       yield
     end
 
@@ -81,6 +83,11 @@ def add_nav(doc)
       doc.blocks.append nav.footer
     end
 
+    def add_url_to_v3(doc)
+      url_to_v3 = UrlToV3.new doc
+      doc.blocks.insert 0, url_to_v3.url
+    end
+
     def correct_xref(node)
       refid = node.attributes['refid']
       return unless (ref = node.document.catalog[:refs][refid])
@@ -108,6 +115,8 @@ def form_section_into_page(doc, section, html)
 
     def add_subdoc_sections(doc, subdoc, html)
       nav = Nav.new subdoc
+      url_to_v3 = UrlToV3.new subdoc
+      subdoc << url_to_v3.url
       subdoc << nav.header
       subdoc << Asciidoctor::Block.new(subdoc, :pass, source: html)
       subdoc << footnotes(doc, subdoc) if doc.footnotes?
@@ -143,6 +152,7 @@ def subdoc_attrs(doc, section)
       attrs['subdoc'] = true # Mark the subdoc so we don't try and chunk it
       attrs['title-separator'] = ''
       attrs['canonical-url'] = section.attributes['canonical-url']
+      attrs['current-url'] = "#{section.id}.html"
       attrs.merge! find_related(section)
       attrs
     end

resources/asciidoctor/lib/chunker/url_to_v3.rb

@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+module Chunker
+  # Add a warning to the page with a link to docs v3
+  class UrlToV3
+    attr_reader :url
+
+    def initialize(doc)
+      current_url = doc.attr('current-url')
+      outdir = doc.attr('outdir')
+      current_url ||= 'index.html'
+      m = mapping
+      # This only works in CI.
+      segments = outdir.sub('/tmp/docsbuild/target_repo/raw', '').split('/')
+      version = segments[-1] || 'unknown'
+      actual_url = get_actual_url(outdir, current_url)
+      new_url = if m.key?(actual_url)
+                  m[actual_url]
+                else
+                  '/docs'
+                end
+      render_warning(doc, version, new_url)
+    end
+
+    def mapping
+      file_path = File.expand_path('v3-mapping.json', __dir__)
+      JSON.parse(File.read(file_path)) if File.exist?(file_path)
+    end
+
+    def get_path_dir(outdir)
+      segments = outdir.sub('/tmp/docsbuild/target_repo/raw', '').split('/')
+      if segments.empty?
+        ''
+      elsif segments.length > 1
+        segments[0...-1].join('/')
+      else
+        segments[0]
+      end
+    end
+
+    def get_actual_url(outdir, current_url)
+      get_path_dir(outdir) + '/*/' + current_url
+    end
+
+    def render_warning(doc, version, new_url)
+      if version == '8.18'
+        @url = Asciidoctor::Block.new(doc, :pass, source: <<~HTML)
+          <div id="url-to-v3" style="version-warning">
+            A newer version is available. For the latest information, see the <a href="https://www.elastic.co#{new_url}">current release documentation</a>
+          </div>
+        HTML
+      else
+        @url = Asciidoctor::Block.new(doc, :pass, source: <<~HTML)
+          <div id="url-to-v3" class="version-warning">
+            <bold>IMPORTANT</bold>: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the <a href="https://www.elastic.co#{new_url}">current release documentation</a>
+          </div>
+        HTML
+      end
+    end
+  end
+end