Quick and dirty eigenclass-defined class methods in Ruby

count_eigenclass_methods.rb

code = File.read(ARGV.first)

eigenclass = false
methods    = 0
identation = ''

code.split("\n").each do |line|
  case line
  when /^(\s*)class\s+<<\s+self\b/
    eigenclass = true
    identation = $1
  when /\bdef\b/
    methods += 1 if eigenclass
  when /^#{identation}end\b/
    eigenclass = false
  end
end

puts "#{methods}\t#{ARGV.first}"