Update support for Unicode 15.1

Upgrade to start using Unicode 15.1 emojis. Note that while 16.0 was just released, noto-emoji doesn't yet support it. Various things start breaking without the proper fallback images, and it's better to wait until 16 is a little more prevalent.

• load the Unicode emoji-test.txt file as the main basis for emoji data
• load the gemojione data, adding as aliases
• load any additional aliases

Closes #28 (closed)

lib/tanuki_emoji/db/gemojione.rb

@@ -24,38 +24,17 @@ module TanukiEmoji
           JSON.parse(file.read, symbolize_names: true)
         end
 
-        db.each do |emoji_name, emoji_data|
+        db.each do |_emoji_name, emoji_data|
           emoji = @index.find_by_codepoints(emoji_data[:moji])
 
-          unless emoji
-            # search using alternates
-            puts "SEARCHING ALTERNATES for #{emoji_name} #{emoji_data[:moji]}"
-            emoji_data[:unicode_alternates].each do |unicode_alternates|
-              next if emoji
-
-              codepoints = unicode_hex_to_codepoint(unicode_alternates)
-              emoji = @index.find_by_codepoints(codepoints)
-            end
-          end
-
-          if emoji
-            emoji.add_alias(emoji_data[:shortname]) if emoji.alpha_code != emoji_data[:shortname]
-            add_emoji_data(emoji, emoji_data)
-
-            @index.update(emoji)
-          else
-            # add new emoji, or raise error
-            puts "ADDING NEW EMOJI for #{emoji_name} #{emoji_data[:moji]}"
-            emoji = Character.new(emoji_name.to_s,
-                                  codepoints: emoji_data[:moji],
-                                  alpha_code: emoji_data[:shortname],
-                                  description: emoji_data[:name],
-                                  category: emoji_data[:category])
-
-            add_emoji_data(emoji, emoji_data)
-
-            @index.add(emoji)
-          end
+          # if it's not found, don't try to add something that isn't in the
+          # Unicode set.
+          next unless emoji
+
+          emoji.add_alias(emoji_data[:shortname]) if emoji.alpha_code != emoji_data[:shortname]
+          add_emoji_data(emoji, emoji_data)
+
+          @index.update(emoji)
         end
       end