Rails/Compass - Rename Compass generated sprite filenames without hash.

sass_sprite_name_processor.rb

# encoding: UTF-8

# NOTE: Removing the Compass-generated hash from Compass-generated sprite file
#       names so that git history doesn't get jacked up.

SPRITE_FILE_NAMES = []

# Rename sprites to remove the Compass-generated hash and move it up 1 directory
Rails.application.config.compass.on_sprite_saved do |filename|
  if File.exists?(filename)
    renamed_file_name = filename.gsub(%r{-s[a-z0-9]{10}\.}, '.')
    FileUtils.mv(filename, renamed_file_name)
    SPRITE_FILE_NAMES << [File.basename(filename), File.basename(renamed_file_name)]
  end
end

class SpriteNameFixProcessor < ::Tilt::Template
  def prepare; end
  
  # Replace any instances of sprite names with renamed
  # (sans Compass-generated hash) file name.
  def evaluate (scope, locals, &block)
    SPRITE_FILE_NAMES.each do |name, renamed_name|
      data.gsub!(name, renamed_name)
    end
    
    return data
  end
end

Rails.application.assets.register_postprocessor 'text/css', SpriteNameFixProcessor