Export colors from Xcode into CSV

xcassets-export.rb

require "csv"
require "json"

XCASSETS_NAME = "Colors.xcassets"

CSV.open(XCASSETS_NAME + ".csv", "wb") do |csv|
  csv << ["Name", "Appearance", "HEX Value", "Alpha"]

  Dir.glob(XCASSETS_NAME + "/**/*.colorset/Contents.json") do |file_name|
    file = File.read(file_name)
    json = JSON.parse(file)

    if colors = json["colors"]
      colors.each do |color|
        color_space = color["color"]["color-space"]
        appearance = color["appearances"] ? color["appearances"].first["value"] : "any"

        case color_space
        when "srgb"
          components = color["color"]["components"]
          red = components["red"]
          green = components["green"]
          blue = components["blue"]
          alpha = components["alpha"]
          hex_color = ""

          [red, green, blue].each do |component|
            if component.start_with?("0x")
              hex_color += component[2..4]
            else
              hex_color += sprintf("%02X", (component.to_f * 255).to_i)
            end
          end
        
          color_name = file_name.gsub(XCASSETS_NAME + "/", "").gsub(".colorset/Contents.json", "")
          alpha_percentage = (alpha.to_f * 100).to_i.to_s + "%"
          
          csv << [color_name, appearance, hex_color, alpha_percentage]
        else
        end
      end
    end
  end
end