Count the number of lines in the specified pattern

count_lines.rb

root_dir = ARGV[0] || "."
ext = ARGV[1] || "rb"
pattern = "#{root_dir}/**/*.#{ext}"
puts "Counting lines in files which match: #{pattern}"
count = 0

Dir[pattern].each do |file|
  lines_in_file = 0
  if File.exists? file
    contents = File.read(file).split("\n")
    contents.each{ |line| count +=1 and lines_in_file +=1 unless line =~ /^\s*($|#)/ }
  end
  puts "#{file} : #{lines_in_file} lines"
end

puts "#{count} lines of real code"