emoji unicode to emoji-cheat-sheet.com codes

emoji.rb

#!/usr/bin/env ruby

EMOJI_NAME_TO_CODEPOINT = {
  "1F604" => :smile,
  "1F606" => :laughing,
  "1F60A" => :blush,
  "1F603" => :smiley,
  "263A"  => :relaxed,
  "1F60F" => :smirk,
  "1F60D" => :heart_eyes,
  "1F618" => :kissing_heart,
  "1F61A" => :kissing_face,
  "1F633" => :flushed,
  "1F625" => :relieved,
  "1F60C" => :satisfied,
  "1F601" => :grin,
  "1F609" => :wink,
  "1F61C" => :wink2,
  "1F61D" => :tongue,
  "1F612" => :unamused,
  "1F605" => :sweat_smile,
  "1F613" => :sweat,
  "1F629" => :weary,
  "1F614" => :pensive,
  "1F61E" => :dissapointed,
  "1F616" => :confounded,
  "1F628" => :fearful,
  "1F630" => :cold_sweat,
  "1F623" => :persevere,
  "1F622" => :cry,
  "1F62D" => :sob,
  "1F602" => :joy,
  "1F632" => :astonished,
  "1F631" => :scream,
  "1F62B" => :tired_face,
  "1F620" => :angry,
  "1F621" => :rage,
  "1F62A" => :sleepy,
  "1F60B" => :yum,
  "1F637" => :mask,
  "1F60E" => :sunglasses,
  "1F635" => :dizzy_face,
  "1F47F" => :imp,
  "1F608" => :smiling_imp,
  "1F610" => :neutral_face,
  "1F636" => :no_mouth,
  "1F607" => :innocent,


  "1F4A9" => :poop,
  "1F44D" => :thumbsup,
  "1F44E" => :thumbsdown,

  "1F479" => :japanese_ogre


}

remapped_codepoints = $stdin.codepoints.flat_map do |codepoint|
  emoji = EMOJI_NAME_TO_CODEPOINT[codepoint.to_s(16).upcase]
  emoji ? ":#{emoji}:".codepoints.entries : codepoint
end

puts remapped_codepoints.pack("U*")

GitHub won't allow me to post raw Emoji in this form :-( but usage, you can imagine, looks like this:

mark:~ $ echo "this code is DOO_DOO_EMOJI." | Projects/rack-emoji/emoji.rb
this code is :poop:.