From 39aaa0fca567f56724b387fd109a37c8dfb7b59b Mon Sep 17 00:00:00 2001
From: Alyss Noland <alyss.noland@bigcommerce.com>
Date: Thu, 6 Apr 2017 15:33:46 -0700
Subject: [PATCH] Adds unique header creation (#743)

---
 config.rb          |  6 +++++-
 lib/unique_head.rb | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 lib/unique_head.rb

diff --git a/config.rb b/config.rb
index 937f1cf..e0f2479 100644
--- a/config.rb
+++ b/config.rb
@@ -1,3 +1,6 @@
+# Unique header generation
+require './lib/unique_head.rb'
+
 # Markdown
 set :markdown_engine, :redcarpet
 set :markdown,
@@ -7,7 +10,8 @@ set :markdown,
     prettify: true,
     tables: true,
     with_toc_data: true,
-    no_intra_emphasis: true
+    no_intra_emphasis: true,
+    renderer: UniqueHeadCounter
 
 # Assets
 set :css_dir, 'stylesheets'
diff --git a/lib/unique_head.rb b/lib/unique_head.rb
new file mode 100644
index 0000000..6103bbf
--- /dev/null
+++ b/lib/unique_head.rb
@@ -0,0 +1,14 @@
+# Unique header generation
+require 'middleman-core/renderers/redcarpet'
+class UniqueHeadCounter < Middleman::Renderers::MiddlemanRedcarpetHTML
+  @@head_count = {}
+  def header(text, header_level)
+    friendly_text = text.parameterize
+    @@head_count[friendly_text] ||= 0
+    @@head_count[friendly_text] += 1
+    if @@head_count[friendly_text] > 1
+      friendly_text += "-#{@@head_count[friendly_text]}"
+    end
+    return "<h#{header_level} id='#{friendly_text}'>#{text}</h#{header_level}>"
+  end
+end