/
emoji_optimizer.rb
197 lines (160 loc) · 5.16 KB
/
emoji_optimizer.rb
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require 'digest/md5'
require 'tmpdir'
module Emoji
def self.tmp_dir
@tmp_dir ||= Dir.mktmpdir 'emoji-optimization'
end
class Optimizer
def initialize options = {}
@size = options.delete(:size) { 22 }
@padding = options.delete(:padding) { 2 }
@source = Source.new 'public/index.html'
@sprite = Sprite.new @source.emoji_paths, @size, @padding
@retina_sprite = Sprite.new @source.emoji_paths, @size*2, @padding*2
end
def optimize! &block
puts " ** Preparing for optimization"
prepare
puts " ** Generating emoji sprite image #{sprite_path}"
if @sprite.generate sprite_path
puts " ** Generating emoji retina sprite image #{retina_sprite_path}"
@retina_sprite.generate retina_sprite_path
puts " ** Generating css and updating markup"
generate_and_save
else
puts " ** Could not generate emoji sprite =("
end
yield
ensure
puts " ** Cleaning up after optimization"
cleanup
end
private
def prepare
FileUtils.cp 'public/index.html', File.join(Emoji.tmp_dir, 'index.html')
FileUtils.cp 'public/style.css', File.join(Emoji.tmp_dir, 'style.css')
end
def generate_and_save
update_source_markup
File.open('public/style.css', 'a') { |f| f.puts css_rules.join("\n") }
File.open('public/index.html','w') { |f| f.write @source.to_html }
FileUtils.mv sprite_path, "public/graphics/#{digest_name}"
FileUtils.mv retina_sprite_path, "public/graphics/#{retina_digest_name}"
end
def cleanup
FileUtils.mv File.join(Emoji.tmp_dir, 'index.html'), 'public/index.html'
FileUtils.mv File.join(Emoji.tmp_dir, 'style.css'), 'public/style.css'
FileUtils.rm_f "public/graphics/#{@digest_name}"
FileUtils.rm_f "public/graphics/#{@retina_digest_name}"
end
def css_rules
[].tap do |rules|
rules << %Q{
.emoji {
float:left;
margin-right:.5em;
width:#{@size}px;
height:#{@size}px;
}
@media all and (-webkit-min-device-pixel-ratio: 1),
all and (-moz-min-device-pixel-ratio: 1),
all and (-o-min-device-pixel-ratio: 1),
all and (min-device-pixel-ratio: 1) {
.emoji {
background:transparent url(/graphics/#{digest_name}) 0 0 no-repeat;
}
}
@media all and (-webkit-min-device-pixel-ratio: 1.5),
all and (-moz-min-device-pixel-ratio: 1.5),
all and (-o-min-device-pixel-ratio: 3/2),
all and (min-device-pixel-ratio: 1.5) {
.emoji {
background:transparent url(/graphics/#{retina_digest_name}) 0 0 no-repeat;
background-size: #{(@size+@padding*2)*@source.emoji_paths.size}px #{@size}px;
}
}
}
@source.emojis.size.times do |index|
rules << css_sprite_mapping(index)
end
end
end
def update_source_markup
@source.emojis.each_with_index do |img, index|
img.replace @source.create_element 'span', {
'id' => "e_#{index+1}",
'class' => 'emoji',
'data-src' => img['src']
}
end
end
def css_sprite_mapping index
offset = @sprite.offset index
"#e_#{index+1} { background-position:-#{offset}px 0; }"
end
def sprite_path
@sprite_path ||= File.join Emoji.tmp_dir, 'sprite.png'
end
def retina_sprite_path
@retina_sprite_path ||= File.join Emoji.tmp_dir, 'sprite@2x.png'
end
def digest_name
@digest_name ||= "sprite_%s.png" % Digest::MD5.hexdigest( File.read(sprite_path) )
end
def retina_digest_name
@retina_digest_name ||= "sprite_%s@2x.png" % Digest::MD5.hexdigest( File.read(retina_sprite_path) )
end
end
class Source
def initialize file
@file = file
end
def emojis
@emojis ||= doc.css('#content img').find_all { |img| img['src'] =~ /emojis/ }
end
def emoji_paths
@emoji_paths ||= emojis.map { |img| File.join 'public', img['src'] }
end
def create_element *args
doc.create_element *args
end
def to_html
doc.to_html
end
private
def doc
@doc ||= Nokogiri::HTML File.open(@file)
end
end
class Sprite
def initialize files, size, padding
@files = files
@size = size
@padding = padding
end
def offset index
((@size + @padding * 2) * index) + @padding
end
def generate path
args = {
tile: 'x1',
geometry: "#{@size}x#{@size}+#{@padding}",
depth: '8',
background: 'transparent',
sharpen: '0x1.5'
}.map { |k, v| "-#{k} #{v}" }.join(' ')
system "montage %s %s %s" % [ @files.join(' '), args, path ]
optimize!(path)
end
private
def optimize!(path)
puts "Checking for png optimizer"
if system "which optipng"
puts "Optimizing generated png"
system "optipng -o5 #{path}"
else
puts "No optimization of generated sprite will be done. Install optipng if you want it."
end
end
end
end