Add option to disable emoji replacements

Fixes #647

The option is found in `/settings` (because that was easier to write it this
way) but only affects the glitch-soc front-end.

app/controllers/settings/preferences_controller.rb

@@ -49,6 +49,7 @@ class Settings::PreferencesController < Settings::BaseController
       :setting_expand_spoilers,
       :setting_reduce_motion,
       :setting_system_font_ui,
+      :setting_system_emoji_font,
       :setting_noindex,
       :setting_hide_network,
       :setting_hide_followers_count,

app/javascript/flavours/glitch/util/emoji/index.js

@@ -1,4 +1,4 @@
-import { autoPlayGif } from 'flavours/glitch/util/initial_state';
+import { autoPlayGif, useSystemEmojiFont } from 'flavours/glitch/util/initial_state';
 import unicodeMapping from './emoji_unicode_mapping_light';
 import Trie from 'substring-trie';
 
@@ -12,7 +12,7 @@ const emojify = (str, customEmojis = {}) => {
   let rtn = '', tagChars = tagCharsWithEmojis, invisible = 0;
   for (;;) {
     let match, i = 0, tag;
-    while (i < str.length && (tag = tagChars.indexOf(str[i])) === -1 && (invisible || !(match = trie.search(str.slice(i))))) {
+    while (i < str.length && (tag = tagChars.indexOf(str[i])) === -1 && (invisible || useSystemEmojiFont || !(match = trie.search(str.slice(i))))) {
       i += str.codePointAt(i) < 65536 ? 1 : 2;
     }
     let rend, replacement = '';
@@ -57,7 +57,7 @@ const emojify = (str, customEmojis = {}) => {
         }
       }
       i = rend;
-    } else { // matched to unicode emoji
+    } else if (!useSystemEmojiFont) { // matched to unicode emoji
       const { filename, shortCode } = unicodeMapping[match];
       const title = shortCode ? `:${shortCode}:` : '';
       replacement = `<img draggable="false" class="emojione" alt="${match}" title="${title}" src="${assetHost}/emoji/${filename}.svg" />`;

app/javascript/flavours/glitch/util/initial_state.js

@@ -31,5 +31,6 @@ export const defaultContentType = getMeta('default_content_type');
 export const forceSingleColumn = getMeta('advanced_layout') === false;
 export const useBlurhash = getMeta('use_blurhash');
 export const usePendingItems = getMeta('use_pending_items');
+export const useSystemEmojiFont = getMeta('system_emoji_font');
 
 export default initialState;

app/lib/user_settings_decorator.rb

@@ -29,6 +29,7 @@ class UserSettingsDecorator
     user.settings['expand_spoilers']     = expand_spoilers_preference if change?('setting_expand_spoilers')
     user.settings['reduce_motion']       = reduce_motion_preference if change?('setting_reduce_motion')
     user.settings['system_font_ui']      = system_font_ui_preference if change?('setting_system_font_ui')
+    user.settings['system_emoji_font']   = system_emoji_font_preference if change?('setting_system_emoji_font')
     user.settings['noindex']             = noindex_preference if change?('setting_noindex')
     user.settings['hide_followers_count']= hide_followers_count_preference if change?('setting_hide_followers_count')
     user.settings['flavour']             = flavour_preference if change?('setting_flavour')
@@ -79,6 +80,10 @@ class UserSettingsDecorator
     boolean_cast_setting 'setting_system_font_ui'
   end
 
+  def system_emoji_font_preference
+    boolean_cast_setting 'setting_system_emoji_font'
+  end
+
   def auto_play_gif_preference
     boolean_cast_setting 'setting_auto_play_gif'
   end

app/models/user.rb

@@ -108,7 +108,7 @@ class User < ApplicationRecord
            :reduce_motion, :system_font_ui, :noindex, :flavour, :skin, :display_media, :hide_network, :hide_followers_count,
            :expand_spoilers, :default_language, :aggregate_reblogs, :show_application,
            :advanced_layout, :use_blurhash, :use_pending_items, :trends,
-           :default_content_type,
+           :default_content_type, :system_emoji_font,
            to: :settings, prefix: :setting, allow_nil: false
 
   attr_reader :invite_code

app/serializers/initial_state_serializer.rb

@@ -53,6 +53,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       store[:is_staff]          = object.current_account.user.staff?
       store[:trends]            = Setting.trends && object.current_account.user.setting_trends
       store[:default_content_type] = object.current_account.user.setting_default_content_type
+      store[:system_emoji_font] = object.current_account.user.setting_system_emoji_font
     end
 
     store

app/views/settings/preferences/appearance/show.html.haml

@@ -21,6 +21,7 @@
     = f.input :setting_auto_play_gif, as: :boolean, wrapper: :with_label, recommended: true
     = f.input :setting_reduce_motion, as: :boolean, wrapper: :with_label
     = f.input :setting_system_font_ui, as: :boolean, wrapper: :with_label
+    = f.input :setting_system_emoji_font, as: :boolean, wrapper: :with_label
 
   %h4= t 'appearance.discovery'
 

config/locales/simple_form.en.yml

@@ -124,6 +124,7 @@ en:
         setting_reduce_motion: Reduce motion in animations
         setting_show_application: Disclose application used to send toots
         setting_skin: Skin
+        setting_system_emoji_font: Use system's default font for emojis (applies to Glitch flavour only)
         setting_system_font_ui: Use system's default font
         setting_theme: Site theme
         setting_trends: Show today's trends

config/settings.yml

@@ -29,6 +29,7 @@ defaults: &defaults
   reduce_motion: false
   show_application: false
   system_font_ui: false
+  system_emoji_font: false
   noindex: false
   hide_followers_count: false
   enable_keybase: true