namespace :gemojione do desc 'Generates Emoji SHA256 digests' task digests: :environment do require 'digest/sha2' require 'json' dir = Gemojione.index.images_path digests = AwardEmoji.emojis.map do |name, emoji_hash| fpath = File.join(dir, "#{emoji_hash['unicode']}.png") digest = Digest::SHA256.file(fpath).hexdigest { name: name, unicode: emoji_hash['unicode'], digest: digest } end out = File.join(Rails.root, 'fixtures', 'emojis', 'digests.json') File.open(out, 'w') do |handle| handle.write(JSON.pretty_generate(digests)) end end # This task will generate a standard and Retina sprite of all of the current # Gemojione Emojis, with the accompanying SCSS map. # # It will not appear in `rake -T` output, and the dependent gems are not # included in the Gemfile by default, because this task will only be needed # occasionally, such as when new Emojis are added to Gemojione. task sprite: :environment do begin require 'sprite_factory' require 'rmagick' rescue LoadError # noop end check_requirements! SIZE = 20 RETINA = SIZE * 2 Dir.mktmpdir do |tmpdir| # Copy the Gemojione assets to the temporary folder for resizing FileUtils.cp_r(Gemojione.index.images_path, tmpdir) Dir.chdir(tmpdir) do Dir["**/*.png"].each do |png| resize!(File.join(tmpdir, png), SIZE) end end style_path = Rails.root.join(*%w(app assets stylesheets pages emojis.scss)) # Combine the resized assets into a packed sprite and re-generate the SCSS SpriteFactory.cssurl = "image-url('$IMAGE')" SpriteFactory.run!(File.join(tmpdir, 'images'), { output_style: style_path, output_image: "app/assets/images/emoji.png", selector: '.emoji-', style: :scss, nocomments: true, pngcrush: true, layout: :packed }) # SpriteFactory's SCSS is a bit too verbose for our purposes here, so # let's simplify it system(%Q(sed -i '' "s/width: #{SIZE}px; height: #{SIZE}px; background: image-url('emoji.png')/background-position:/" #{style_path})) system(%Q(sed -i '' "s/ no-repeat//" #{style_path})) system(%Q(sed -i '' "s/ 0px/ 0/" #{style_path})) # Append a generic rule that applies to all Emojis File.open(style_path, 'a') do |f| f.puts f.puts <<-CSS.strip_heredoc .emoji-icon { background-image: image-url('emoji.png'); background-repeat: no-repeat; height: #{SIZE}px; width: #{SIZE}px; @media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (min--moz-device-pixel-ratio: 2), only screen and (-o-min-device-pixel-ratio: 2/1), only screen and (min-device-pixel-ratio: 2), only screen and (min-resolution: 192dpi), only screen and (min-resolution: 2dppx) { background-image: image-url('emoji@2x.png'); background-size: 840px 820px; } } CSS end end # Now do it again but for Retina Dir.mktmpdir do |tmpdir| # Copy the Gemojione assets to the temporary folder for resizing FileUtils.cp_r(Gemojione.index.images_path, tmpdir) Dir.chdir(tmpdir) do Dir["**/*.png"].each do |png| resize!(File.join(tmpdir, png), RETINA) end end # Combine the resized assets into a packed sprite and re-generate the SCSS SpriteFactory.run!(File.join(tmpdir, 'images'), { output_image: "app/assets/images/emoji@2x.png", style: false, nocomments: true, pngcrush: true, layout: :packed }) end end def check_requirements! return if defined?(SpriteFactory) && defined?(Magick) puts <<-MSG.strip_heredoc This task is disabled by default and should only be run when the Gemojione gem is updated with new Emojis. To enable this task, *temporarily* add the following lines to Gemfile and re-bundle: gem 'sprite-factory' gem 'rmagick' MSG exit 1 end def resize!(image_path, size) # Resize the image in-place, save it, and free the object image = Magick::Image.read(image_path).first image.resize!(size, size) image.write(image_path) { self.quality = 100 } image.destroy! end end