Ruby: Remove the random string in the sprite filename

Remove the random string in the sprite filename

# Make a copy of sprites with a name that has no uniqueness of the hash.
on_sprite_saved do |filename|
  if File.exists?(filename)
    FileUtils.cp filename, filename.gsub(%r{-s[a-z0-9]{10}\.png$}, '.png')
    # Note: Compass outputs both with and without random hash images.
    # To not keep the one with hash, add: (Thanks to RaphaelDDL for this)
    FileUtils.rm_rf(filename)
  end
end
 
# Replace in stylesheets generated references to sprites
# by their counterparts without the hash uniqueness.
on_stylesheet_saved do |filename|
  if File.exists?(filename)
    css = File.read filename
    File.open(filename, 'w+') do |f|
      f << css.gsub(%r{-s[a-z0-9]{10}\.png}, '.png')
      # Add a query string to the end of the filename
      # background-image: url('../img/ico.png?v=ab47cfd764');
      # f << css.gsub(%r{(?<start>-s)(?<hash>[a-z0-9]{10})(?<file>\.png)}, '.png?v=\k<hash>')
    end
  end
end