file name edit in regular expression

reg_rename.rb

require "find"
Dir[File.dirname(__FILE__) + "/com_lib/*.rb"].each {|file| require file}

def yesno?(ms = "")
  blue "#{ms}\nPlease press y/n\n> "
  i = STDIN.gets

  if /^y$|^Y$|^yes$|^Yes$|^YES$/ =~ i
    return true
  elsif /^n$|^N$|^no$|^No$|^NO$/ =~ i
    return false
  else
    yesno?()
  end
end

def blue ms
  print "\e[35m" + ms + "\e[0m"
end

def user_ask
  print "Regexp\n> "
  patt = Regexp.new(STDIN.gets.chomp)

  print "Replace str or Empty str or \"extract\"\n> "
  repl = STDIN.gets.chomp

  return patt, repl
end

def replace file_path
  file_name = File.basename(file_path)
  if file_name.match(PATT)
    puts file_name
    new_file_path = WD + "/" + file_name.gsub(PATT,REPL).to_s
    puts File.basename(new_file_path)
    $paths.push([file_path, new_file_path])
    puts ""
  end
end

def extract file_path
  file_name = File.basename(file_path)
  extension = File.extname(file_path)
  extension = "" if extension.size > 4 

  if new_file_name = file_name.match(PATT)
    puts file_name
    new_file_path = WD + "/" + new_file_name[1].to_s + extension
    puts File.basename(new_file_path)
    $paths.push([file_path, new_file_path])
    puts ""
  end
end

def execute
  $paths.each do |path|
    crnt_path, new_path = path
    File.rename(crnt_path, new_path)
  end
end


PATT, REPL = user_ask
$paths = Array.new
ARGV[0].nil? ? WD=Dir.pwd : WD=ARGV[0]

print("Regexp: ")
p PATT
print("Replac: #{REPL}\n")
print("Dircty: #{WD}\n\n")


Find.find(WD) do |file_path|
  next if File.basename(file_path) == ".DS_Store"
  next if File.basename(file_path) == File.basename(WD)

  if REPL == "extract"
    unless $displayed
      puts "! EXTRACT !"
      $displayed = true
    end
    extract file_path
  else
    replace file_path
  end
end

if yesno?("Execute?")
  execute
  puts "Done"
else
  puts "Canceled"
end