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|
# 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.
begin
require 'sprite_factory'
require 'rmagick'
rescue LoadError
# noop
end
namespace :gemojione do
task sprite: :environment do
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}))
# 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
|
