Add support for emojione

lib/gollum/app.rb

@@ -49,7 +49,7 @@ module Precious
   class App < Sinatra::Base
     register Mustache::Sinatra
     include Precious::Helpers
-    
+
     dir     = File.dirname(File.expand_path(__FILE__))
 
     # Detect unsupported browsers.
@@ -130,6 +130,14 @@ module Precious
       Gollum::Wiki.new(settings.gollum_path, settings.wiki_options)
     end
 
+    get '/emoji/:name' do
+      begin
+        [200, {'Content-Type' => 'image/png'}, emoji(params['name'])]
+      rescue ArgumentError
+        not_found
+      end
+    end
+
     get '/data/*' do
       if page = wiki_page(params[:splat].first).page
         page.raw_data

lib/gollum/helpers.rb

@@ -1,6 +1,11 @@
 # ~*~ encoding: utf-8 ~*~
+require 'gemojione'
+
 module Precious
   module Helpers
+
+    EMOJI_PATHNAME = Pathname.new(Gemojione.index.images_path).freeze
+
     # Extract the path string that Gollum::Wiki expects
     def extract_path(file_path)
       return nil if file_path.nil?
@@ -51,5 +56,13 @@ module Precious
       return mustache :error
     end
 
+    def emoji(name)
+      if emoji = Gemojione.index.find_by_name(name)
+        IO.read(EMOJI_PATHNAME.join("#{emoji['unicode']}.png"))
+      else
+        fail ArgumentError, "emoji `#{name}' not found"
+      end
+    end
+
   end
 end

lib/gollum/public/gollum/css/gollum.css

@@ -849,3 +849,9 @@ ul.actions {
 .clearfloats {
   clear: both;
 }
+
+.emoji {
+  width: 20px;
+  height: 20px;
+  vertical-align: -18%;
+}

lib/gollum/public/gollum/javascript/editor/langs/markdown.js

@@ -211,6 +211,11 @@ var MarkDownHelp = [
                 {
                   menuName: 'Escaping',
                   data: '<p>If you want to use a special Markdown character in your document (such as displaying literal asterisks), you can escape the character with the backslash (<code>\\</code>). Markdown will ignore the character directly after a backslash.'
+                },
+
+                {
+                  menuName: 'Emoji',
+                  data: '<p>See the <a href="http://emojione.com/demo/" target="_blank">EmojiOne demo</a> for all available emoji. To include one, wrap the emoji name in colons and use underscores instead of spaces (e.g. :heart: or :point_up:).'
                 }
               ]
   }