Get the colors from a CSS file, sorted by how often they occurr.

parse_css_colors.rb

require 'open-uri'

#uri = "http://www.zeldman.com/wp-content/themes/zeldman-v2/style.css?0111110710"
#uri = "http://asset2.betterplace.org/stylesheets/screen.css?1299172234"
uri = 'http://www.xing.com/css/v/144/general.min.css'


def parse_css_colors(uri)
  file = open(uri).read
  hex_colors     = file.scan(/#[a-f0-9]{3,6}/i)
  rgb_colors     = file.scan(/rgba?\(.+?\)/i)
  hsl_colors     = file.scan(/hsla?\(.+?\)/i)
  keyword_colors = file.scan(/\:\s*(aqua|black|blue|fuchsia|gray|green|lime|maroon|navy|olive|orange|purple|red|silver|teal|white|yellow)/).map { |c| c.first}

  colors = hex_colors + rgb_colors + hsl_colors + keyword_colors

  # normalize hexcodes, i.e. downcase and extend shortened ones
  # example: #F90 => #ff9900
  colors.map! do |color| 
    color.downcase!
    if (color[0,1] == '#' && color.length == 4) 
      color = "#" + color[1..-1].chars.map { |c| c * 2 }.join
    end
    color
  end

  # count usages
  colors = colors.reduce({}) do |hash, color| 
    hash[color] ||= 0
    hash[color] += 1
    hash
  end

  colors.sort { |h1, h2| h2[1] <=> h1[1] }
end

colors = parse_css_colors(uri)



#
# show the colors
#
tempfile_path = "/tmp/css_colors_#{Time.now.to_i}.html"
File.open(tempfile_path, "w") do |f|
  f << <<-EOS
  <style type="text/css">
  div.container {
    width:220px;
    height:60px;
    padding:10px;
    border-bottom:1px dotted #666;
    float:left;
  }
  div.color-swatch {
    border: 1px solid #999;
    margin-right: 10px;
    width: 50px;
    height: 50px;
    float:left;
  }
  h3 { 
    font-size:16px;
    padding:0;
    margin:0
  }
  </style>
  EOS
  colors.each do |color, count|
    f << '<div class="container">'
    f << %(<div class="color-swatch" style="background-color:#{color}"></div>)
    f << %(<div class="label"><h3>#{color}</h3><i>occurred #{count} times</i></div>)
    f << '</div>'
  end
end

`open #{tempfile_path}`

Great! Thx for sharing.
Just in case you ever want to support all color keywords that work in modern browsers: http://www.w3.org/TR/css3-color/#svg-color

Danke. Aber, ooochh, wer braucht denn noch mehr Keywords, liebes W3C? Nimmt doch eh keiner

ich wollte es ja nur gesagt haben! habe nicht erwartet dass du das einbaust :)