asciinema.org/lib/tasks/colors.rake

desc 'Generate color palettes'
task :gen_color_palettes do
  require 'yaml'

  default = YAML.load_file('config/colors/default.yml')
  rgb = YAML.load_file('config/colors/rgb.yml')
  colors = default.merge(rgb)

  out = ""

  colors.each do |n, value|
    out << ".fg#{n} { color: #{value} }\n"
    out << ".bg#{n} { background-color: #{value} }\n"
  end

  File.open('app/assets/stylesheets/colors.css', 'w') { |f| f.write out }

  File.open('app/assets/javascripts/player/colors.js', 'w') do |f|
    f.write "Asciinema.colors = #{JSON.dump(colors)};"
  end
end