[Emojis in Markdown] (#1653)

- Adds the ability to add emojis using colons 😂 🎉
- The emoji conversion is added to the markdown parser labor
- When no emoji is found with the alias, same text is returned
- No assets added (no emoji images), so this will only be supported when the browser supports emojis (https://blog.getemoji.com/post/57054354336/which-browsers-support-emoji)
- Emoji conversion logic is out of markdown parser labor
- Adds its own spec

Gemfile

@@ -46,6 +46,7 @@ gem "feedjira", "~> 2.2"
 gem "figaro", "~> 1.1"
 gem "fog", "~> 1.41"
 gem "front_matter_parser", "~> 0.2"
+gem "gemoji", "~> 3.0.0"
 gem "gibbon", "~> 2.2"
 gem "google-api-client", "~> 0.27"
 gem "honeycomb-rails"

Gemfile.lock

@@ -450,6 +450,7 @@ GEM
     fugit (1.1.6)
       et-orbi (~> 1.1, >= 1.1.6)
       raabro (~> 1.1)
+    gemoji (3.0.0)
     get_process_mem (0.2.3)
     gibbon (2.2.5)
       faraday (>= 0.9.1)
@@ -964,6 +965,7 @@ DEPENDENCIES
   fix-db-schema-conflicts!
   fog (~> 1.41)
   front_matter_parser (~> 0.2)
+  gemoji (~> 3.0.0)
   gibbon (~> 2.2)
   google-api-client (~> 0.27)
   guard (~> 2.15)

app/labor/emoji_converter.rb

@@ -0,0 +1,19 @@
+class EmojiConverter
+  attr_reader :html
+
+  def self.call(html)
+    new(html).convert
+  end
+
+  def initialize(html)
+    @html = html
+  end
+
+  def convert
+    html.gsub!(/:([\w+-]+):/) do |match|
+      emoji = Emoji.find_by_alias($1)
+      emoji.present? ? emoji.raw : match
+    end
+    html
+  end
+end

app/labor/markdown_parser.rb

@@ -24,6 +24,7 @@ class MarkdownParser
     html = wrap_all_images_in_links(html)
     html = wrap_all_tables(html)
     html = remove_empty_paragraphs(html)
+    html = EmojiConverter.call(html)
     wrap_mentions_with_links!(html)
   end
 

spec/labor/emoji_converter_spec.rb

@@ -0,0 +1,19 @@
+require "rails_helper"
+
+RSpec.describe EmojiConverter do
+  def convert_emoji(html)
+    EmojiConverter.call(html)
+  end
+
+  describe "#convert" do
+    it "converts emoji names wrapped in colons into unicode" do
+      joy_emoji_unicode = Emoji.find_by_alias("joy").raw
+      expect(convert_emoji(":joy:")).to include(joy_emoji_unicode)
+    end
+
+    it "leaves original text between colons when no emoji is found" do
+      emoji_text = ":no_one_will_ever_create_an_emoji_with_this_alias:"
+      expect(convert_emoji(emoji_text)).to include(emoji_text)
+    end
+  end
+end