class SourceAnnotationExtractor

def find_in(dir)

are taken into account.
+.scss+, +.js+, +.coffee+, and +.rake+
with extension +.builder+, +.rb+, +.erb+, +.haml+, +.slim+, +.css+,
with their annotations. Only files with annotations are included. Files
Returns a hash that maps filenames under +dir+ (recursively) to arrays 
def find_in(dir)
  results = {}
  Dir.glob("#{dir}/*") do |item|
    next if File.basename(item)[0] == ?.
    if File.directory?(item)
      results.update(find_in(item))
    else
      pattern =
          case item
          when /\.(builder|rb|coffee|rake)$/
            /#\s*(#{tag}):?\s*(.*)$/
          when /\.(css|scss|js)$/
            /\/\/\s*(#{tag}):?\s*(.*)$/
          when /\.erb$/
            /<%\s*#\s*(#{tag}):?\s*(.*?)\s*%>/
          when /\.haml$/
            /-\s*#\s*(#{tag}):?\s*(.*)$/
          when /\.slim$/
            /\/\s*\s*(#{tag}):?\s*(.*)$/
          else nil
          end
      results.update(extract_annotations_from(item, pattern)) if pattern
    end
  end
  results
end