Project files analytics ruby script

Project files analytics script, could work even on PHP, python projects ;)

directory = ARGV.shift || Dir.pwd
$dont_get_into = ['.','..']
$allowed = {
            'Ruby' => '.rb', 
            'Ruby HTML Templates' => '.html.erb',
            'YAML' => '.yml',
            'RDoc' => '.rdoc',
            'HTML' => '.html',
            'Javascript' => '.js',
            'CSS' => '.css',
            'Sass' => '.scss',
            'CofeeScript' => '.coffee'
            }
$analytics = {}
def analyze(dir)
    Dir.new(dir).each do |file_name|

        if (! $dont_get_into.include? file_name) and 
            File.directory? dir + File::SEPARATOR + file_name 
                analyze dir + File::SEPARATOR + file_name 
        end

        $allowed.each do |file, extension|
            if file_name.end_with? extension
                $analytics[file] = 0 if $analytics[file].nil?
                $analytics[file] += 1
                break
            end
        end

    end
end
analyze directory
puts 'No files found that matches your creteria.' if $analytics.empty?
puts $analytics.map { |k,v| "#{k} : #{v} Files"  }.join "\n"