Headers have ids and link to their own id.

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/redcarpet/render/gitlab_html.rb b/lib/redcarpet/render/gitlab_html.rb
index 6da0c1d6f96..42f6316910a 100644
--- a/lib/redcarpet/render/gitlab_html.rb
+++ b/lib/redcarpet/render/gitlab_html.rb
@@ -8,6 +8,7 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
     @project = @template.instance_variable_get("@project")
     @ref = @template.instance_variable_get("@ref")
     @request_path = @template.instance_variable_get("@path")
+    @options = options.dup
     super options
   end
 
@@ -34,6 +35,16 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
     h.link_to_gfm(content, link, title: title)
   end
 
+  def header(text, level)
+    if @options[:no_header_anchors]
+      "<h#{level}>#{text}</h#{level}>"
+    else
+      id = ActionController::Base.helpers.strip_tags(h.gfm(text)).downcase() \
+          .gsub(/[^a-z0-9_-]/, '-').gsub(/-+/, '-').gsub(/^-/, '').gsub(/-$/, '')
+      "<h#{level} id=\"#{id}\">#{text}<a href=\"\##{id}\"></a></h#{level}>"
+    end
+  end
+
   def preprocess(full_document)
     if @project
       h.create_relative_links(full_document, @project, @ref, @request_path, is_wiki?)