1 files changed, 42 insertions, 1 deletions
diff --git a/lib/gitlab/emoji.rb b/lib/gitlab/emoji.rb
index bbbca8acc40..42703545c4f 100644
--- a/lib/gitlab/emoji.rb
+++ b/lib/gitlab/emoji.rb
@@ -1,7 +1,7 @@
 module Gitlab
   module Emoji
     extend self
-    
+
     def emojis
       Gemojione.index.instance_variable_get(:@emoji_by_name)
     end
@@ -18,6 +18,10 @@ module Gitlab
       emojis.keys
     end
 
+    def emojis_aliases
+      @emoji_aliases ||= JSON.parse(File.read(Rails.root.join('fixtures', 'emojis', 'aliases.json')))
+    end
+
     def emoji_filename(name)
       emojis[name]["unicode"]
     end
@@ -25,5 +29,42 @@ module Gitlab
     def emoji_unicode_filename(moji)
       emojis_by_moji[moji]["unicode"]
     end
+
+    def emoji_unicode_version(name)
+      @emoji_unicode_versions_by_name ||= JSON.parse(File.read(Rails.root.join('node_modules', 'emoji-unicode-version', 'emoji-unicode-version-map.json')))
+      @emoji_unicode_versions_by_name[name]
+    end
+
+    def normalize_emoji_name(name)
+      emojis_aliases[name] || name
+    end
+
+    def emoji_image_tag(name, src)
+      "<img class='emoji' title=':#{name}:' alt=':#{name}:' src='#{src}' height='20' width='20' align='absmiddle' />"
+    end
+
+    # CSS sprite fallback takes precedence over image fallback
+    def gl_emoji_tag(name, image: false, sprite: false, force_fallback: false)
+      emoji_name = emojis_aliases[name] || name
+      emoji_info = emojis[emoji_name]
+      emoji_fallback_image_source = ActionController::Base.helpers.url_to_image("emoji/#{emoji_info['name']}.png")
+      emoji_fallback_sprite_class = "emoji-#{emoji_name}"
+
+      data = {
+        name: emoji_name,
+        unicode_version: emoji_unicode_version(emoji_name)
+      }
+      data[:fallback_src] = emoji_fallback_image_source if image
+      data[:fallback_sprite_class] = emoji_fallback_sprite_class if sprite
+      ActionController::Base.helpers.content_tag 'gl-emoji',
+        class: ("emoji-icon #{emoji_fallback_sprite_class}" if force_fallback && sprite),
+        data: data do
+        if force_fallback && !sprite
+          emoji_image_tag(emoji_name, emoji_fallback_image_source)
+        else
+          emoji_info['moji']
+        end
+      end
+    end
   end
 end