gistfile1.rb

require 'yaml'

namespace :app do
  RE_COLOR_RGB = Regexp.new('(rgb[\s]*\([\s-]*[\d]+(\.[\d]+)?[%\s]*,[\s-]*[\d]+(\.[\d]+)?[%\s]*,[\s-]*[\d]+(\.[\d]+)?[%\s]*\))', Regexp::IGNORECASE)
  RE_COLOR_HEX = /(#([0-9a-f]{6}|[0-9a-f]{3})([\s;]|$))/i
  RE_COLOR_NAMED = /([\s]*^)?(aqua|black|blue|fuchsia|gray|green|lime|maroon|navy|olive|orange|purple|red|silver|teal|white|yellow|transparent)([\s]*$)?/i
  RE_COLOR = Regexp.union(RE_COLOR_RGB, RE_COLOR_HEX, RE_COLOR_NAMED)

  @results = []

  desc 'show all colors from css file'
  task :palette do
    assets = open("#{RAILS_ROOT}/config/assets.yml") {|f| YAML.load(f) }

    assets['stylesheets']['desktop'].each do |stylesheet|
      read_file(stylesheet)
    end
  end

  def read_file(file)
    File.open("#{RAILS_ROOT}/#{file}", "r").each_line do |line|
      parse_css_string line
    end
  end

  def parse_css_string(line)
    colors = line.scan(RE_COLOR)
    colors.flatten.compact.each do |c|
      @results << c.sub(';','') if c.match(RE_COLOR)
    end
  end
end