Fix mathjax on edit and create pages (#1773)

* Fix mathjax on edit and create pages

lib/gollum/app.rb

@@ -20,6 +20,7 @@ require 'gollum/views/layout'
 require 'gollum/views/editable'
 require 'gollum/views/has_page'
 require 'gollum/views/has_user_icons'
+require 'gollum/views/has_math'
 require 'gollum/views/pagination'
 require 'gollum/views/rss.rb'
 require 'gollum/views/template_cascade'
@@ -125,6 +126,7 @@ module Precious
       @css = settings.wiki_options[:css]
       @js  = settings.wiki_options[:js]
       @mathjax_config = settings.wiki_options[:mathjax_config]
+      @mathjax = settings.wiki_options[:mathjax]
 
       @use_static_assets = settings.wiki_options.fetch(:static, settings.environment != :development)
       @static_assets_path = settings.wiki_options.fetch(:static_assets_path, ::File.join(File.dirname(__FILE__), 'public/assets'))
@@ -217,7 +219,6 @@ module Precious
           if page = wikip.page
               @page         = page
               @content      = page.text_data
-              @mathjax      = wiki.mathjax
               @etag         = page.sha
               mustache :edit
           else
@@ -613,7 +614,6 @@ module Precious
         # Extensions and layout data
         @editable      = true
         @toc_content   = wiki.universal_toc ? @page.toc_data : nil
-        @mathjax       = wiki.mathjax
         @h1_title      = wiki.h1_title
         @bar_side      = wiki.bar_side
         @allow_uploads = wiki.allow_uploads

lib/gollum/views/create.rb

@@ -2,6 +2,7 @@ module Precious
   module Views
     class Create < Layout
       include Editable
+      include HasMath
 
       attr_reader :page, :name
 
@@ -41,9 +42,9 @@ module Precious
       def content
         @template_page
       end
-      
+
       private
-      
+
       def find_format
         @found_format ||= (Gollum::Page.format_for("#{@name}#{@ext}") || default_markup)
       end

lib/gollum/views/edit.rb

@@ -3,6 +3,7 @@ module Precious
     class Edit < Layout
       include Editable
       include HasPage
+      include HasMath
 
       attr_reader :page, :content
 
@@ -18,10 +19,6 @@ module Precious
       def page_name
         @name
       end
-      
-      def mathjax
-        @mathjax
-      end
 
       def header
         if @header.nil?
@@ -67,7 +64,7 @@ module Precious
       def etag
         @etag
       end
-      
+
       def allow_uploads
         @allow_uploads
       end

lib/gollum/views/has_math.rb

@@ -0,0 +1,11 @@
+module Precious
+  module HasMath
+    def mathjax
+      @mathjax
+    end
+
+    def mathjax_config
+      @mathjax_config
+    end
+  end
+end

lib/gollum/views/page.rb

@@ -2,9 +2,10 @@ module Precious
   module Views
     class Page < Layout
       include HasPage
+      include HasMath
 
       attr_reader :content, :page, :header, :footer, :preview, :historical
-      
+
       VALID_COUNTER_STYLES = ['decimal', 'decimal-leading-zero', 'arabic-indic', 'armenian', 'upper-armenian',
         'lower-armenian', 'bengali', 'cambodian', 'khmer', 'cjk-decimal', 'devanagari', 'georgian', 'gujarati', 'gurmukhi',
         'hebrew', 'kannada', 'lao', 'malayalam', 'mongolian', 'myanmar', 'oriya', 'persian', 'lower-roman', 'upper-roman',
@@ -61,11 +62,11 @@ module Precious
       def editable
         @editable
       end
-      
+
       def search
         true
       end
-      
+
       def history
         true
       end
@@ -73,11 +74,11 @@ module Precious
       def latest_changes
         true
       end
-      
+
       def overview
-        true 
+        true
       end
-        
+
       def allow_editing
         @allow_editing
       end
@@ -157,14 +158,6 @@ module Precious
         @toc_content
       end
 
-      def mathjax
-        @mathjax
-      end
-
-      def mathjax_config
-        @mathjax_config
-      end
-
       def use_identicon
         @page.wiki.user_icons == 'identicon'
       end
@@ -182,7 +175,7 @@ module Precious
       # Returns Hash.
       def metadata
         @page.metadata
-      end   
+      end
 
       # Access to embedded metadata.
       #