discourse/lib/tasks/images.rake

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require_dependency "file_helper"
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task "images:compress" => :environment do
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images = Dir.glob("#{Rails.root}/app/**/*.png")
image_sizes = images.map { |i| [i, File.size(i)] }.to_h
images.each do |path|
if FileHelper.optimize_image!(path)
new_size = File.size(path)
puts "#{path} => from: #{image_sizes[path]} to: #{new_size}"
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end
end
end