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